{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-25T20:02:24.235Z"},"system":{"slug":"washington-dc-2024","name":"Washington Dc","state":"DC","year":2023,"url":"https://www.thewatermap.com/water/dc/washington-dc/2023","apiUrl":"https://www.thewatermap.com/api/water/dc/washington-dc/2023","markdownUrl":"https://www.thewatermap.com/water/dc/washington-dc/2023/llms.txt","coordinates":{"latitude":38.8950982,"longitude":-77.0363849},"contaminantsMeasured":30,"contaminantsWithFederalLimit":11,"contaminantsAtOrAboveLimit":1,"contaminantsApproachingLimit":0,"source":{"type":"Consumer Confidence Report (CCR)","description":"Figures are transcribed from the water utility's own annual Consumer Confidence Report, cross-checked by a second model, and approved by a person before publishing."},"families":[{"family":"disinfectant","familyLabel":"Disinfectants","contaminants":[{"analyteId":"chlorine","name":"Chlorine","family":"disinfectant","familyLabel":"Disinfectants","casrn":null,"whatItIs":"A disinfectant added to drinking water to kill bacteria and viruses.","whyItMatters":"Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"3.0 (Highest running annual average)"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"3.0 (Highest running annual average)"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.2 to 4.3 (Range of single site results)"}]}]},{"family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","contaminants":[{"analyteId":"haa5","name":"HAA5","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.","whyItMatters":"Long-term exposure above the federal limit is associated with an increased cancer risk.","measured":{"value":37,"low":null,"high":null,"kind":"point","display":"37","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"37 (Highest location running annual average)"},"federalStandard":{"type":"MCL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":28,"low":null,"high":null,"kind":"point","display":"28","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"28"},{"value":37,"low":null,"high":null,"kind":"point","display":"37","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"37 (Highest location running annual average)"},{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"12 to 59 (Range of single site results)"},{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"12 to 43"}]},{"analyteId":"perchlorate","name":"Perchlorate","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":"14797-73-0","whatItIs":"A chemical used in rocket fuel and fireworks that can also form during disinfection.","whyItMatters":"Can interfere with thyroid hormone production; has no national enforceable limit but is regulated in some states.","measured":{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.2"}]},{"analyteId":"tthm","name":"TTHM","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.","whyItMatters":"Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.","measured":{"value":58,"low":null,"high":null,"kind":"point","display":"58","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"58 (Highest locational running annual average)"},"federalStandard":{"type":"MCL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":14,"low":null,"high":null,"kind":"point","display":"14","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"14 to 76"},{"value":58,"low":null,"high":null,"kind":"point","display":"58","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"58 (Highest locational running annual average)"},{"value":41,"low":null,"high":null,"kind":"point","display":"41","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"41"},{"value":19,"low":null,"high":null,"kind":"point","display":"19","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"19 to 86 (Range of single site results)"}]}]},{"family":"inorganic","familyLabel":"Inorganic chemicals","contaminants":[{"analyteId":"ammonia","name":"Ammonia","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"7664-41-7","whatItIs":null,"whyItMatters":null,"measured":{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"1"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"}]},{"analyteId":"chloride","name":"Chloride","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"16887-00-6","whatItIs":"A naturally occurring salt compound.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.","measured":{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"32"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"32"},{"value":20,"low":null,"high":null,"kind":"point","display":"20","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"20 to 42"}]},{"analyteId":"fluoride","name":"Fluoride","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"16984-48-8","whatItIs":"A mineral often added to drinking water to help prevent tooth decay.","whyItMatters":"Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.","measured":{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.7"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.7"},{"value":0.6,"low":null,"high":null,"kind":"point","display":"0.6","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.6 to 0.7"}]},{"analyteId":"nitrate","name":"Nitrate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"14797-55-8","whatItIs":"A compound from fertilizer runoff, septic systems, and erosion of natural deposits.","whyItMatters":"Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.","measured":{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"ND to 2"},"federalStandard":{"type":"MCLG","value":10,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"ND to 2"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"2"}]},{"analyteId":"sulfate","name":"Sulfate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"14808-79-8","whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"No health-based federal limit; high levels can have a laxative effect and a bitter taste.","measured":{"value":47,"low":null,"high":null,"kind":"point","display":"47","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"47"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":47,"low":null,"high":null,"kind":"point","display":"47","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"47"},{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"32 to 71"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"analyteId":"aluminum","name":"Aluminum","family":"metal","familyLabel":"Metals","casrn":"7429-90-5","whatItIs":"A common element sometimes used as a treatment coagulant.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels can discolor water.","measured":{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"39"},{"value":14,"low":null,"high":null,"kind":"point","display":"14","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"14 to 98"}]},{"analyteId":"arsenic","name":"Arsenic","family":"metal","familyLabel":"Metals","casrn":"7440-38-2","whatItIs":"A naturally occurring element that also enters water from industry and agriculture.","whyItMatters":"A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.","measured":{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.4"},"federalStandard":{"type":"MCLG","value":0,"units":"ug/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.4"},{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.4 to 0.4"}]},{"analyteId":"barium","name":"Barium","family":"metal","familyLabel":"Metals","casrn":"7440-39-3","whatItIs":"A metal from erosion of natural deposits and industrial discharge.","whyItMatters":"Long-term exposure above the federal limit can raise blood pressure.","measured":{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.04 to 0.04"},"federalStandard":{"type":"MCLG","value":2,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.04 to 0.04"},{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.04"}]},{"analyteId":"calcium","name":"Calcium","family":"metal","familyLabel":"Metals","casrn":"7440-70-2","whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"39"},{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"25 to 61"}]},{"analyteId":"iron","name":"Iron","family":"metal","familyLabel":"Metals","casrn":"7439-89-6","whatItIs":"A naturally occurring metal common in groundwater.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.","measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 12"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]},{"analyteId":"lithium","name":"Lithium","family":"metal","familyLabel":"Metals","casrn":"7439-93-2","whatItIs":"A naturally occurring element found in some groundwater.","whyItMatters":"No enforceable federal limit; on the EPA contaminant candidate list for further study.","measured":{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"1 to 4"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"2"}]},{"analyteId":"magnesium","name":"Magnesium","family":"metal","familyLabel":"Metals","casrn":"7439-95-4","whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":9,"low":null,"high":null,"kind":"point","display":"9","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"9"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 15"},{"value":9,"low":null,"high":null,"kind":"point","display":"9","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"9"}]},{"analyteId":"manganese","name":"Manganese","family":"metal","familyLabel":"Metals","casrn":"7439-96-5","whatItIs":"A naturally occurring metal from soil and rock.","whyItMatters":"No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.","measured":{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"}]},{"analyteId":"nickel","name":"Nickel","family":"metal","familyLabel":"Metals","casrn":"7440-02-0","whatItIs":"A metal from natural deposits and industrial discharge.","whyItMatters":"Long-term exposure can cause skin and other effects; monitored under EPA rules.","measured":{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.6,"low":null,"high":null,"kind":"point","display":"0.6","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.6"},{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"}]},{"analyteId":"potassium","name":"Potassium","family":"metal","familyLabel":"Metals","casrn":"7440-09-7","whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"Not federally regulated for health.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"3"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"2 to 3"}]},{"analyteId":"sodium","name":"Sodium","family":"metal","familyLabel":"Metals","casrn":"7440-23-5","whatItIs":"A naturally occurring salt component.","whyItMatters":"Not federally regulated for health; relevant for people on sodium-restricted diets.","measured":{"value":22,"low":null,"high":null,"kind":"point","display":"22","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"22"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":13,"low":null,"high":null,"kind":"point","display":"13","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"13 to 30"},{"value":22,"low":null,"high":null,"kind":"point","display":"22","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"22"}]},{"analyteId":"strontium","name":"Strontium","family":"metal","familyLabel":"Metals","casrn":"7440-24-6","whatItIs":null,"whyItMatters":null,"measured":{"value":187,"low":null,"high":null,"kind":"point","display":"187","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"187"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":187,"low":null,"high":null,"kind":"point","display":"187","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"187"},{"value":120,"low":null,"high":null,"kind":"point","display":"120","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"120 to 266"}]},{"analyteId":"vanadium","name":"Vanadium","family":"metal","familyLabel":"Metals","casrn":"7440-62-2","whatItIs":null,"whyItMatters":null,"measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]},{"analyteId":"zinc","name":"Zinc","family":"metal","familyLabel":"Metals","casrn":"7440-66-6","whatItIs":"A naturally occurring metal that can also enter water from corroding pipes.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels cause a metallic taste.","measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]}]},{"family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","contaminants":[{"analyteId":"pfhxs","name":"Perfluorohexanesulfonic acid","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"355-46-4","whatItIs":"Perfluorohexanesulfonic acid, a PFAS 'forever chemical.'","whyItMatters":"Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.","measured":{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.2 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 2.1 ppt"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"0.2 ppt"}]},{"analyteId":"pfas","name":"PFAS","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":0.001,"low":null,"high":null,"kind":"point","display":"0.001","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.001 ppt"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.001,"low":0,"high":0.001,"kind":"range","display":"0–0.001","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"0 - 0.001 ppt"},{"value":0.001,"low":null,"high":null,"kind":"point","display":"0.001","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"0.001 ppt"}]},{"analyteId":"pfoa","name":"PFOA","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"335-67-1","whatItIs":"Perfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.","whyItMatters":"Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.","measured":{"value":1.5,"low":null,"high":null,"kind":"point","display":"1.5","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.5 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.5,"low":null,"high":null,"kind":"point","display":"1.5","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"1.5 ppt"},{"value":3.8,"low":null,"high":null,"kind":"point","display":"3.8","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 3.8 ppt"}]},{"analyteId":"pfos","name":"PFOS","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"1763-23-1","whatItIs":"Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.","whyItMatters":"Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.","measured":{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.1 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"over","label":"At or above the limit"},"breakdowns":[],"measurements":[{"value":3.8,"low":null,"high":null,"kind":"point","display":"3.8","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 3.8 ppt"},{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"2.1 ppt"}]}]},{"family":"physical_aggregate","familyLabel":"Physical & aggregate","contaminants":[{"analyteId":"hardness","name":"Hardness","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"A measure of dissolved calcium and magnesium minerals.","whyItMatters":"Not federally regulated for health; affects scaling, soap use, and taste.","measured":{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"8"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 12"},{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 12"},{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"8"},{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"8"}]},{"analyteId":"toc","name":"TOC","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"Total organic carbon — a measure of organic material dissolved in the water.","whyItMatters":"Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.","measured":{"value":1.37,"low":null,"high":null,"kind":"point","display":"1.37","units":null,"statisticType":"reported_level","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"1.37 (lowest annual average). Annual average must be greater than 1.00 to be in compliance"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1.37,"low":null,"high":null,"kind":"point","display":"1.37","units":null,"statisticType":"reported_level","samplingContext":"plant:DC Drinking Water","rawVerbatim":"1.37 (lowest annual average). Annual average must be greater than 1.00 to be in compliance"}]}]},{"family":"voc_pesticide","familyLabel":"VOCs & pesticides","contaminants":[{"analyteId":"dalapon","name":"Dalapon","family":"voc_pesticide","familyLabel":"VOCs & pesticides","casrn":"75-99-0","whatItIs":null,"whyItMatters":null,"measured":{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"ND to 1"},"federalStandard":{"type":"MCLG","value":200,"units":"ug/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"max","samplingContext":"system","rawVerbatim":"1"}]}]}],"contaminants":[{"analyteId":"chlorine","name":"Chlorine","family":"disinfectant","familyLabel":"Disinfectants","casrn":null,"whatItIs":"A disinfectant added to drinking water to kill bacteria and viruses.","whyItMatters":"Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"3.0 (Highest running annual average)"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"3.0 (Highest running annual average)"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.2 to 4.3 (Range of single site results)"}]},{"analyteId":"haa5","name":"HAA5","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.","whyItMatters":"Long-term exposure above the federal limit is associated with an increased cancer risk.","measured":{"value":37,"low":null,"high":null,"kind":"point","display":"37","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"37 (Highest location running annual average)"},"federalStandard":{"type":"MCL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":28,"low":null,"high":null,"kind":"point","display":"28","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"28"},{"value":37,"low":null,"high":null,"kind":"point","display":"37","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"37 (Highest location running annual average)"},{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"12 to 59 (Range of single site results)"},{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"12 to 43"}]},{"analyteId":"perchlorate","name":"Perchlorate","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":"14797-73-0","whatItIs":"A chemical used in rocket fuel and fireworks that can also form during disinfection.","whyItMatters":"Can interfere with thyroid hormone production; has no national enforceable limit but is regulated in some states.","measured":{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.2"}]},{"analyteId":"tthm","name":"TTHM","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.","whyItMatters":"Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.","measured":{"value":58,"low":null,"high":null,"kind":"point","display":"58","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"58 (Highest locational running annual average)"},"federalStandard":{"type":"MCL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":14,"low":null,"high":null,"kind":"point","display":"14","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"14 to 76"},{"value":58,"low":null,"high":null,"kind":"point","display":"58","units":"ug/L","statisticType":"running_annual_avg","samplingContext":"system","rawVerbatim":"58 (Highest locational running annual average)"},{"value":41,"low":null,"high":null,"kind":"point","display":"41","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"41"},{"value":19,"low":null,"high":null,"kind":"point","display":"19","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"19 to 86 (Range of single site results)"}]},{"analyteId":"ammonia","name":"Ammonia","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"7664-41-7","whatItIs":null,"whyItMatters":null,"measured":{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"1"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"}]},{"analyteId":"chloride","name":"Chloride","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"16887-00-6","whatItIs":"A naturally occurring salt compound.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.","measured":{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"32"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"32"},{"value":20,"low":null,"high":null,"kind":"point","display":"20","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"20 to 42"}]},{"analyteId":"fluoride","name":"Fluoride","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"16984-48-8","whatItIs":"A mineral often added to drinking water to help prevent tooth decay.","whyItMatters":"Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.","measured":{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.7"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.7"},{"value":0.6,"low":null,"high":null,"kind":"point","display":"0.6","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.6 to 0.7"}]},{"analyteId":"nitrate","name":"Nitrate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"14797-55-8","whatItIs":"A compound from fertilizer runoff, septic systems, and erosion of natural deposits.","whyItMatters":"Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.","measured":{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"ND to 2"},"federalStandard":{"type":"MCLG","value":10,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"ND to 2"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"2"}]},{"analyteId":"sulfate","name":"Sulfate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"14808-79-8","whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"No health-based federal limit; high levels can have a laxative effect and a bitter taste.","measured":{"value":47,"low":null,"high":null,"kind":"point","display":"47","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"47"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":47,"low":null,"high":null,"kind":"point","display":"47","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"47"},{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"32 to 71"}]},{"analyteId":"aluminum","name":"Aluminum","family":"metal","familyLabel":"Metals","casrn":"7429-90-5","whatItIs":"A common element sometimes used as a treatment coagulant.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels can discolor water.","measured":{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"39"},{"value":14,"low":null,"high":null,"kind":"point","display":"14","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"14 to 98"}]},{"analyteId":"arsenic","name":"Arsenic","family":"metal","familyLabel":"Metals","casrn":"7440-38-2","whatItIs":"A naturally occurring element that also enters water from industry and agriculture.","whyItMatters":"A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.","measured":{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.4"},"federalStandard":{"type":"MCLG","value":0,"units":"ug/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.4"},{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"ug/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.4 to 0.4"}]},{"analyteId":"barium","name":"Barium","family":"metal","familyLabel":"Metals","casrn":"7440-39-3","whatItIs":"A metal from erosion of natural deposits and industrial discharge.","whyItMatters":"Long-term exposure above the federal limit can raise blood pressure.","measured":{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"0.04 to 0.04"},"federalStandard":{"type":"MCLG","value":2,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"range","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.04 to 0.04"},{"value":0.04,"low":null,"high":null,"kind":"point","display":"0.04","units":"mg/L","statisticType":"max","samplingContext":"plant:DC Drinking Water","rawVerbatim":"0.04"}]},{"analyteId":"calcium","name":"Calcium","family":"metal","familyLabel":"Metals","casrn":"7440-70-2","whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"39"},{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"25 to 61"}]},{"analyteId":"iron","name":"Iron","family":"metal","familyLabel":"Metals","casrn":"7439-89-6","whatItIs":"A naturally occurring metal common in groundwater.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.","measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 12"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]},{"analyteId":"lithium","name":"Lithium","family":"metal","familyLabel":"Metals","casrn":"7439-93-2","whatItIs":"A naturally occurring element found in some groundwater.","whyItMatters":"No enforceable federal limit; on the EPA contaminant candidate list for further study.","measured":{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"1 to 4"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"2"}]},{"analyteId":"magnesium","name":"Magnesium","family":"metal","familyLabel":"Metals","casrn":"7439-95-4","whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":9,"low":null,"high":null,"kind":"point","display":"9","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"9"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 15"},{"value":9,"low":null,"high":null,"kind":"point","display":"9","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"9"}]},{"analyteId":"manganese","name":"Manganese","family":"metal","familyLabel":"Metals","casrn":"7439-96-5","whatItIs":"A naturally occurring metal from soil and rock.","whyItMatters":"No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.","measured":{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"}]},{"analyteId":"nickel","name":"Nickel","family":"metal","familyLabel":"Metals","casrn":"7440-02-0","whatItIs":"A metal from natural deposits and industrial discharge.","whyItMatters":"Long-term exposure can cause skin and other effects; monitored under EPA rules.","measured":{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.6,"low":null,"high":null,"kind":"point","display":"0.6","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.6"},{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"}]},{"analyteId":"potassium","name":"Potassium","family":"metal","familyLabel":"Metals","casrn":"7440-09-7","whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"Not federally regulated for health.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"3"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"3"},{"value":2,"low":null,"high":null,"kind":"point","display":"2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"2 to 3"}]},{"analyteId":"sodium","name":"Sodium","family":"metal","familyLabel":"Metals","casrn":"7440-23-5","whatItIs":"A naturally occurring salt component.","whyItMatters":"Not federally regulated for health; relevant for people on sodium-restricted diets.","measured":{"value":22,"low":null,"high":null,"kind":"point","display":"22","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"22"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":13,"low":null,"high":null,"kind":"point","display":"13","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"13 to 30"},{"value":22,"low":null,"high":null,"kind":"point","display":"22","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"22"}]},{"analyteId":"strontium","name":"Strontium","family":"metal","familyLabel":"Metals","casrn":"7440-24-6","whatItIs":null,"whyItMatters":null,"measured":{"value":187,"low":null,"high":null,"kind":"point","display":"187","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"187"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":187,"low":null,"high":null,"kind":"point","display":"187","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"187"},{"value":120,"low":null,"high":null,"kind":"point","display":"120","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"120 to 266"}]},{"analyteId":"vanadium","name":"Vanadium","family":"metal","familyLabel":"Metals","casrn":"7440-62-2","whatItIs":null,"whyItMatters":null,"measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]},{"analyteId":"zinc","name":"Zinc","family":"metal","familyLabel":"Metals","casrn":"7440-66-6","whatItIs":"A naturally occurring metal that can also enter water from corroding pipes.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels cause a metallic taste.","measured":{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 0.8"},{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"}]},{"analyteId":"pfhxs","name":"Perfluorohexanesulfonic acid","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"355-46-4","whatItIs":"Perfluorohexanesulfonic acid, a PFAS 'forever chemical.'","whyItMatters":"Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.","measured":{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.2 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 2.1 ppt"},{"value":0.2,"low":null,"high":null,"kind":"point","display":"0.2","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"0.2 ppt"}]},{"analyteId":"pfas","name":"PFAS","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":0.001,"low":null,"high":null,"kind":"point","display":"0.001","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.001 ppt"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.001,"low":0,"high":0.001,"kind":"range","display":"0–0.001","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"0 - 0.001 ppt"},{"value":0.001,"low":null,"high":null,"kind":"point","display":"0.001","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"0.001 ppt"}]},{"analyteId":"pfoa","name":"PFOA","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"335-67-1","whatItIs":"Perfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.","whyItMatters":"Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.","measured":{"value":1.5,"low":null,"high":null,"kind":"point","display":"1.5","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.5 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.5,"low":null,"high":null,"kind":"point","display":"1.5","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"1.5 ppt"},{"value":3.8,"low":null,"high":null,"kind":"point","display":"3.8","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 3.8 ppt"}]},{"analyteId":"pfos","name":"PFOS","family":"pfas","familyLabel":"PFAS (\"forever chemicals\")","casrn":"1763-23-1","whatItIs":"Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.","whyItMatters":"Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.","measured":{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.1 ppt"},"federalStandard":{"type":"MCL","value":1.9,"units":null,"enforceable":true},"status":{"key":"over","label":"At or above the limit"},"breakdowns":[],"measurements":[{"value":3.8,"low":null,"high":null,"kind":"point","display":"3.8","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"Non-detect to 3.8 ppt"},{"value":2.1,"low":null,"high":null,"kind":"point","display":"2.1","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"2.1 ppt"}]},{"analyteId":"hardness","name":"Hardness","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"A measure of dissolved calcium and magnesium minerals.","whyItMatters":"Not federally regulated for health; affects scaling, soap use, and taste.","measured":{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"8"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 12"},{"value":6,"low":null,"high":null,"kind":"point","display":"6","units":null,"statisticType":"range","samplingContext":"system","rawVerbatim":"6 to 12"},{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"8"},{"value":8,"low":null,"high":null,"kind":"point","display":"8","units":null,"statisticType":"average","samplingContext":"system","rawVerbatim":"8"}]},{"analyteId":"toc","name":"TOC","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"Total organic carbon — a measure of organic material dissolved in the water.","whyItMatters":"Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.","measured":{"value":1.37,"low":null,"high":null,"kind":"point","display":"1.37","units":null,"statisticType":"reported_level","samplingContext":"plant:DC Drinking Water","censored":false,"detectionLimit":null,"rawVerbatim":"1.37 (lowest annual average). Annual average must be greater than 1.00 to be in compliance"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":1.37,"low":null,"high":null,"kind":"point","display":"1.37","units":null,"statisticType":"reported_level","samplingContext":"plant:DC Drinking Water","rawVerbatim":"1.37 (lowest annual average). Annual average must be greater than 1.00 to be in compliance"}]},{"analyteId":"dalapon","name":"Dalapon","family":"voc_pesticide","familyLabel":"VOCs & pesticides","casrn":"75-99-0","whatItIs":null,"whyItMatters":null,"measured":{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"ND to 1"},"federalStandard":{"type":"MCLG","value":200,"units":"ug/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"ND to 1"},{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"ug/L","statisticType":"max","samplingContext":"system","rawVerbatim":"1"}]}]}}