{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-25T20:19:55.137Z"},"system":{"slug":"md__dorchester__0090001-Bonnie-Brooke","name":"Bonnie Brooke","state":"MD","year":2024,"url":"https://www.thewatermap.com/water/md/bonnie-brooke/2024","apiUrl":"https://www.thewatermap.com/api/water/md/bonnie-brooke/2024","markdownUrl":"https://www.thewatermap.com/water/md/bonnie-brooke/2024/llms.txt","coordinates":{"latitude":38.4226,"longitude":-76.0779},"contaminantsMeasured":12,"contaminantsWithFederalLimit":10,"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":0.97,"low":null,"high":null,"kind":"point","display":"0.97","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.97"},"federalStandard":{"type":"MRDLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.97,"low":null,"high":null,"kind":"point","display":"0.97","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.97"}]}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":2,"rawVerbatim":"<2.00 ppb"},"federalStandard":{"type":"AL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<2.00 ppb"}]},{"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":22.2,"low":null,"high":null,"kind":"point","display":"22.2","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"22.2 ppb"},"federalStandard":{"type":"AL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":22.2,"low":null,"high":null,"kind":"point","display":"22.2","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"22.2 ppb"}]}]},{"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":876,"low":null,"high":null,"kind":"point","display":"876","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"876 ppb"},"federalStandard":{"type":"MCL","value":4000,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":876,"low":null,"high":null,"kind":"point","display":"876","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"876 ppb"}]},{"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":19,"low":null,"high":null,"kind":"point","display":"19","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"19 ppm"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":19,"low":null,"high":null,"kind":"point","display":"19","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"19 ppm"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"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,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"reported_level","samplingContext":"system","censored":true,"detectionLimit":0.005,"rawVerbatim":"<0.005 ppb"},"federalStandard":{"type":"MCL","value":10,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"<0.005 ppb"}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":1300,"rawVerbatim":"<1300 ppb"},"federalStandard":{"type":"AL","value":1300,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<1300 ppb"}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":5,"rawVerbatim":"<5 ppb"},"federalStandard":{"type":"AL","value":15,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<5 ppb"}]},{"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":173,"low":null,"high":null,"kind":"point","display":"173","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"173 ppm"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":173,"low":null,"high":null,"kind":"point","display":"173","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"173 ppm"}]}]},{"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":1.1,"low":null,"high":null,"kind":"point","display":"1.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.1 pcm"},"federalStandard":{"type":"MCL","value":5,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.1,"low":null,"high":null,"kind":"point","display":"1.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1.1 pcm"}]},{"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":1.2,"low":null,"high":null,"kind":"point","display":"1.2","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.2 pCi/l**"},"federalStandard":{"type":"MCL","value":15,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.2,"low":null,"high":null,"kind":"point","display":"1.2","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1.2 pCi/l**"}]},{"analyteId":"gross_beta","name":"Gross Beta Particle Activity","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Gross beta particle activity — a combined measure of beta-emitting radioactive substances.","whyItMatters":"Long-term exposure above the federal screening level increases cancer risk.","measured":{"value":5.5,"low":null,"high":null,"kind":"point","display":"5.5","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"5.5"},"federalStandard":{"type":"MCL","value":50,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.5,"low":null,"high":null,"kind":"point","display":"5.5","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"5.5"}]}]}],"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":0.97,"low":null,"high":null,"kind":"point","display":"0.97","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.97"},"federalStandard":{"type":"MRDLG","value":4,"units":"mg/L","enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.97,"low":null,"high":null,"kind":"point","display":"0.97","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"0.97"}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":2,"rawVerbatim":"<2.00 ppb"},"federalStandard":{"type":"AL","value":60,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<2.00 ppb"}]},{"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":22.2,"low":null,"high":null,"kind":"point","display":"22.2","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"22.2 ppb"},"federalStandard":{"type":"AL","value":80,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":22.2,"low":null,"high":null,"kind":"point","display":"22.2","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"22.2 ppb"}]},{"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":876,"low":null,"high":null,"kind":"point","display":"876","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"876 ppb"},"federalStandard":{"type":"MCL","value":4000,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":876,"low":null,"high":null,"kind":"point","display":"876","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"876 ppb"}]},{"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":19,"low":null,"high":null,"kind":"point","display":"19","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"19 ppm"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":19,"low":null,"high":null,"kind":"point","display":"19","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"19 ppm"}]},{"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,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"reported_level","samplingContext":"system","censored":true,"detectionLimit":0.005,"rawVerbatim":"<0.005 ppb"},"federalStandard":{"type":"MCL","value":10,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"<0.005 ppb"}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":1300,"rawVerbatim":"<1300 ppb"},"federalStandard":{"type":"AL","value":1300,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<1300 ppb"}]},{"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":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","censored":true,"detectionLimit":5,"rawVerbatim":"<5 ppb"},"federalStandard":{"type":"AL","value":15,"units":"ug/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"ug/L","statisticType":"p90","samplingContext":"system","rawVerbatim":"<5 ppb"}]},{"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":173,"low":null,"high":null,"kind":"point","display":"173","units":"mg/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"173 ppm"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":173,"low":null,"high":null,"kind":"point","display":"173","units":"mg/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"173 ppm"}]},{"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":1.1,"low":null,"high":null,"kind":"point","display":"1.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.1 pcm"},"federalStandard":{"type":"MCL","value":5,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.1,"low":null,"high":null,"kind":"point","display":"1.1","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1.1 pcm"}]},{"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":1.2,"low":null,"high":null,"kind":"point","display":"1.2","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"1.2 pCi/l**"},"federalStandard":{"type":"MCL","value":15,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.2,"low":null,"high":null,"kind":"point","display":"1.2","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"1.2 pCi/l**"}]},{"analyteId":"gross_beta","name":"Gross Beta Particle Activity","family":"radionuclide","familyLabel":"Radionuclides","casrn":null,"whatItIs":"Gross beta particle activity — a combined measure of beta-emitting radioactive substances.","whyItMatters":"Long-term exposure above the federal screening level increases cancer risk.","measured":{"value":5.5,"low":null,"high":null,"kind":"point","display":"5.5","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"5.5"},"federalStandard":{"type":"MCL","value":50,"units":"pCi/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.5,"low":null,"high":null,"kind":"point","display":"5.5","units":"pCi/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"5.5"}]}]}}