{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-25T20:55:34.342Z"},"system":{"slug":"chicago-2024","name":"Chicago","state":"IL","year":2023,"url":"https://www.thewatermap.com/water/il/chicago/2023","apiUrl":"https://www.thewatermap.com/api/water/il/chicago/2023","markdownUrl":"https://www.thewatermap.com/water/il/chicago/2023/llms.txt","coordinates":{"latitude":41.8755616,"longitude":-87.6244212},"contaminantsMeasured":15,"contaminantsWithFederalLimit":12,"contaminantsAtOrAboveLimit":0,"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":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1"},{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0 – 1"}]}]},{"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":26.9,"low":6,"high":26.9,"kind":"range","display":"6–26.9","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"6.0 – 26.9"},"federalStandard":{"type":"MCL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":26.9,"low":6,"high":26.9,"kind":"range","display":"6–26.9","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"6.0 – 26.9"},{"value":16.4,"low":null,"high":null,"kind":"point","display":"16.4","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"16.4"}]},{"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":51,"low":15.9,"high":51,"kind":"range","display":"15.9–51","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"15.9 – 51.0"},"federalStandard":{"type":"MCL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":32.6,"low":null,"high":null,"kind":"point","display":"32.6","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"32.6"},{"value":51,"low":15.9,"high":51,"kind":"range","display":"15.9–51","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"15.9 – 51.0"}]}]},{"family":"inorganic","familyLabel":"Inorganic chemicals","contaminants":[{"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":0.76,"low":0.67,"high":0.76,"kind":"range","display":"0.67–0.76","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.67 – 0.76"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.76,"low":0.67,"high":0.76,"kind":"range","display":"0.67–0.76","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.67 – 0.76"},{"value":0.76,"low":null,"high":null,"kind":"point","display":"0.76","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.76"}]},{"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":0.39,"low":0.36,"high":0.39,"kind":"range","display":"0.36–0.39","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.36 – 0.39"},"federalStandard":{"type":"MCLG","value":10,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.39,"low":0.36,"high":0.39,"kind":"range","display":"0.36–0.39","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.36 – 0.39"},{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.39"}]},{"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":28.2,"low":25.3,"high":28.2,"kind":"range","display":"25.3–28.2","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"25.3 – 28.2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":28.2,"low":25.3,"high":28.2,"kind":"range","display":"25.3–28.2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"25.3 – 28.2"},{"value":28.2,"low":null,"high":null,"kind":"point","display":"28.2","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"28.2"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"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":0.0203,"low":0.0198,"high":0.0203,"kind":"range","display":"0.0198–0.0203","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.0198 -0.0203"},"federalStandard":{"type":"MCLG","value":2,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.0203,"low":0.0198,"high":0.0203,"kind":"range","display":"0.0198–0.0203","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.0198 -0.0203"},{"value":0.0203,"low":null,"high":null,"kind":"point","display":"0.0203","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.0203"}]},{"analyteId":"copper","name":"Copper","family":"metal","familyLabel":"Metals","casrn":"7440-50-8","whatItIs":"A metal that enters water from corroding household plumbing.","whyItMatters":"Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.","measured":{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":1,"rawVerbatim":"< .01 - 0.038"},"federalStandard":{"type":"MCLG","value":1.3,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"< .01 - 0.038"},{"value":0.052,"low":null,"high":null,"kind":"point","display":"0.052","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.052 (90th percen- tile)"}]},{"analyteId":"lead","name":"Lead","family":"metal","familyLabel":"Metals","casrn":"7439-92-1","whatItIs":"A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.","whyItMatters":"There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.","measured":{"value":12,"low":0.69,"high":12,"kind":"range","display":"0.69–12","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.69 - 12"},"federalStandard":{"type":"MCLG","value":0,"units":"ug/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":12,"low":0.69,"high":12,"kind":"range","display":"0.69–12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.69 - 12"},{"value":7.1,"low":null,"high":null,"kind":"point","display":"7.1","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"7.1 (90th percen- tile)"}]},{"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":9.18,"low":null,"high":null,"kind":"point","display":"9.18","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"9.18"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":9.18,"low":null,"high":null,"kind":"point","display":"9.18","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"9.18"},{"value":9.18,"low":8.87,"high":9.18,"kind":"range","display":"8.87–9.18","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"8.87 – 9.18"}]}]},{"family":"microbial","familyLabel":"Microbial","contaminants":[{"analyteId":"ecoli","name":"Escherichia coli (E. coli)","family":"microbial","familyLabel":"Microbial","casrn":null,"whatItIs":"Escherichia coli — bacteria found in the gut of humans and animals.","whyItMatters":"Its presence in drinking water indicates fecal contamination and a real risk of waterborne illness.","measured":{"value":0,"low":null,"high":null,"kind":"point","display":"0","units":null,"statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0"},"federalStandard":{"type":"MCLG","value":0,"units":null,"enforceable":false},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"point","display":"0","units":null,"statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0"}]},{"analyteId":"total_coliform","name":"Total Coliform","family":"microbial","familyLabel":"Microbial","casrn":null,"whatItIs":"A group of bacteria used as an indicator of overall water-system sanitation.","whyItMatters":"Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.","measured":{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"%","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.4%"},"federalStandard":{"type":"MCLG","value":0,"units":"%","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":"%","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.4%"}]}]},{"family":"physical_aggregate","familyLabel":"Physical & aggregate","contaminants":[{"analyteId":"turbidity","name":"Turbidity","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"A measure of cloudiness from suspended particles in the water.","whyItMatters":"High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.","measured":{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"NTU","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"NTU","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.39"}]}]},{"family":"radionuclide","familyLabel":"Radionuclides","contaminants":[{"analyteId":"combined_radium","name":"Combined Radium","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Combined radium-226 and radium-228 — naturally occurring radioactive elements.","whyItMatters":"Long-term exposure above the federal limit increases the risk of bone cancer.","measured":{"value":0.95,"low":null,"high":null,"kind":"point","display":"0.95","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.95"},"federalStandard":{"type":"MCLG","value":0,"units":"pCi/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.95,"low":null,"high":null,"kind":"point","display":"0.95","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.95"},{"value":0.95,"low":0.83,"high":0.95,"kind":"range","display":"0.83–0.95","units":"pCi/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.83 – 0.95"}]},{"analyteId":"gross_alpha","name":"Gross Alpha","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances.","whyItMatters":"Long-term exposure above the federal limit increases cancer risk.","measured":{"value":3.1,"low":2.8,"high":3.1,"kind":"range","display":"2.8–3.1","units":"pCi/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.8 – 3.1"},"federalStandard":{"type":"MCLG","value":0,"units":"pCi/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":3.1,"low":2.8,"high":3.1,"kind":"range","display":"2.8–3.1","units":"pCi/L","statisticType":"range","samplingContext":"system","rawVerbatim":"2.8 – 3.1"},{"value":3.1,"low":null,"high":null,"kind":"point","display":"3.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"3.1"}]}]}],"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":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":null,"high":null,"kind":"point","display":"1","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1"},{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0 – 1"}]},{"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":26.9,"low":6,"high":26.9,"kind":"range","display":"6–26.9","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"6.0 – 26.9"},"federalStandard":{"type":"MCL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":26.9,"low":6,"high":26.9,"kind":"range","display":"6–26.9","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"6.0 – 26.9"},{"value":16.4,"low":null,"high":null,"kind":"point","display":"16.4","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"16.4"}]},{"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":51,"low":15.9,"high":51,"kind":"range","display":"15.9–51","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"15.9 – 51.0"},"federalStandard":{"type":"MCL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":32.6,"low":null,"high":null,"kind":"point","display":"32.6","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"32.6"},{"value":51,"low":15.9,"high":51,"kind":"range","display":"15.9–51","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"15.9 – 51.0"}]},{"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":0.76,"low":0.67,"high":0.76,"kind":"range","display":"0.67–0.76","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.67 – 0.76"},"federalStandard":{"type":"MCLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.76,"low":0.67,"high":0.76,"kind":"range","display":"0.67–0.76","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.67 – 0.76"},{"value":0.76,"low":null,"high":null,"kind":"point","display":"0.76","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.76"}]},{"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":0.39,"low":0.36,"high":0.39,"kind":"range","display":"0.36–0.39","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.36 – 0.39"},"federalStandard":{"type":"MCLG","value":10,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.39,"low":0.36,"high":0.39,"kind":"range","display":"0.36–0.39","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.36 – 0.39"},{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.39"}]},{"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":28.2,"low":25.3,"high":28.2,"kind":"range","display":"25.3–28.2","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"25.3 – 28.2"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":28.2,"low":25.3,"high":28.2,"kind":"range","display":"25.3–28.2","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"25.3 – 28.2"},{"value":28.2,"low":null,"high":null,"kind":"point","display":"28.2","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"28.2"}]},{"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":0.0203,"low":0.0198,"high":0.0203,"kind":"range","display":"0.0198–0.0203","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.0198 -0.0203"},"federalStandard":{"type":"MCLG","value":2,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.0203,"low":0.0198,"high":0.0203,"kind":"range","display":"0.0198–0.0203","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.0198 -0.0203"},{"value":0.0203,"low":null,"high":null,"kind":"point","display":"0.0203","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.0203"}]},{"analyteId":"copper","name":"Copper","family":"metal","familyLabel":"Metals","casrn":"7440-50-8","whatItIs":"A metal that enters water from corroding household plumbing.","whyItMatters":"Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.","measured":{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":1,"rawVerbatim":"< .01 - 0.038"},"federalStandard":{"type":"MCLG","value":1.3,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1,"low":0,"high":1,"kind":"range","display":"0–1","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"< .01 - 0.038"},{"value":0.052,"low":null,"high":null,"kind":"point","display":"0.052","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.052 (90th percen- tile)"}]},{"analyteId":"lead","name":"Lead","family":"metal","familyLabel":"Metals","casrn":"7439-92-1","whatItIs":"A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.","whyItMatters":"There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.","measured":{"value":12,"low":0.69,"high":12,"kind":"range","display":"0.69–12","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.69 - 12"},"federalStandard":{"type":"MCLG","value":0,"units":"ug/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":12,"low":0.69,"high":12,"kind":"range","display":"0.69–12","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.69 - 12"},{"value":7.1,"low":null,"high":null,"kind":"point","display":"7.1","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"7.1 (90th percen- tile)"}]},{"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":9.18,"low":null,"high":null,"kind":"point","display":"9.18","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"9.18"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":9.18,"low":null,"high":null,"kind":"point","display":"9.18","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"9.18"},{"value":9.18,"low":8.87,"high":9.18,"kind":"range","display":"8.87–9.18","units":"mg/L","statisticType":"range","samplingContext":"system","rawVerbatim":"8.87 – 9.18"}]},{"analyteId":"ecoli","name":"Escherichia coli (E. coli)","family":"microbial","familyLabel":"Microbial","casrn":null,"whatItIs":"Escherichia coli — bacteria found in the gut of humans and animals.","whyItMatters":"Its presence in drinking water indicates fecal contamination and a real risk of waterborne illness.","measured":{"value":0,"low":null,"high":null,"kind":"point","display":"0","units":null,"statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0"},"federalStandard":{"type":"MCLG","value":0,"units":null,"enforceable":false},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"point","display":"0","units":null,"statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0"}]},{"analyteId":"total_coliform","name":"Total Coliform","family":"microbial","familyLabel":"Microbial","casrn":null,"whatItIs":"A group of bacteria used as an indicator of overall water-system sanitation.","whyItMatters":"Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.","measured":{"value":0.4,"low":null,"high":null,"kind":"point","display":"0.4","units":"%","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.4%"},"federalStandard":{"type":"MCLG","value":0,"units":"%","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":"%","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.4%"}]},{"analyteId":"turbidity","name":"Turbidity","family":"physical_aggregate","familyLabel":"Physical & aggregate","casrn":null,"whatItIs":"A measure of cloudiness from suspended particles in the water.","whyItMatters":"High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.","measured":{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"NTU","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.39"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.39,"low":null,"high":null,"kind":"point","display":"0.39","units":"NTU","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.39"}]},{"analyteId":"combined_radium","name":"Combined Radium","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Combined radium-226 and radium-228 — naturally occurring radioactive elements.","whyItMatters":"Long-term exposure above the federal limit increases the risk of bone cancer.","measured":{"value":0.95,"low":null,"high":null,"kind":"point","display":"0.95","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.95"},"federalStandard":{"type":"MCLG","value":0,"units":"pCi/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.95,"low":null,"high":null,"kind":"point","display":"0.95","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.95"},{"value":0.95,"low":0.83,"high":0.95,"kind":"range","display":"0.83–0.95","units":"pCi/L","statisticType":"range","samplingContext":"system","rawVerbatim":"0.83 – 0.95"}]},{"analyteId":"gross_alpha","name":"Gross Alpha","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances.","whyItMatters":"Long-term exposure above the federal limit increases cancer risk.","measured":{"value":3.1,"low":2.8,"high":3.1,"kind":"range","display":"2.8–3.1","units":"pCi/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.8 – 3.1"},"federalStandard":{"type":"MCLG","value":0,"units":"pCi/L","enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":3.1,"low":2.8,"high":3.1,"kind":"range","display":"2.8–3.1","units":"pCi/L","statisticType":"range","samplingContext":"system","rawVerbatim":"2.8 – 3.1"},{"value":3.1,"low":null,"high":null,"kind":"point","display":"3.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"3.1"}]}]}}