{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-25T20:03:31.514Z"},"system":{"slug":"metro__224__rochester","name":"Rochester","state":"MN","year":2025,"url":"https://www.thewatermap.com/water/mn/rochester/2025","apiUrl":"https://www.thewatermap.com/api/water/mn/rochester/2025","markdownUrl":"https://www.thewatermap.com/water/mn/rochester/2025/llms.txt","coordinates":{"latitude":44.0234387,"longitude":-92.4630182},"contaminantsMeasured":21,"contaminantsWithFederalLimit":19,"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":1.07,"low":0.94,"high":1.07,"kind":"range","display":"0.94–1.07","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"0.94 - 1.07 ppm"},"federalStandard":{"type":"MCLG","value":4,"units":null,"enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":1.02,"low":null,"high":null,"kind":"point","display":"1.02","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"1.02 ppm"},{"value":1.07,"low":0.94,"high":1.07,"kind":"range","display":"0.94–1.07","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"0.94 - 1.07 ppm"}]}]},{"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":5.5,"low":1.2,"high":5.5,"kind":"range","display":"1.2–5.5","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"1.20 - 5.50 ppb"},"federalStandard":{"type":"MCL","value":60,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":4.1,"low":null,"high":null,"kind":"point","display":"4.1","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"4.1 ppb"},{"value":5.5,"low":1.2,"high":5.5,"kind":"range","display":"1.2–5.5","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"1.20 - 5.50 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":16,"low":4.4,"high":16,"kind":"range","display":"4.4–16","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"4.40 - 16.00 ppb"},"federalStandard":{"type":"MCL","value":80,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":16,"low":4.4,"high":16,"kind":"range","display":"4.4–16","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"4.40 - 16.00 ppb"},{"value":12.9,"low":null,"high":null,"kind":"point","display":"12.9","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"12.9 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":0.72,"low":0.69,"high":0.72,"kind":"range","display":"0.69–0.72","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"0.69 - 0.72 ppm"},"federalStandard":{"type":"MCLG","value":4,"units":null,"enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.72,"low":0.69,"high":0.72,"kind":"range","display":"0.69–0.72","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"0.69 - 0.72 ppm"},{"value":0.71,"low":null,"high":null,"kind":"point","display":"0.71","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"0.71 ppm"}]},{"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":0.19,"low":null,"high":null,"kind":"point","display":"0.19","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","censored":false,"detectionLimit":null,"rawVerbatim":"0.19 ppm"},"federalStandard":{"type":"MCLG","value":10,"units":null,"enforceable":false},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.19,"low":null,"high":null,"kind":"point","display":"0.19","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"0.19 ppm"},{"value":0.19,"low":0,"high":0.19,"kind":"range","display":"0–0.19","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"0.00 - 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4.9 pCi/l"}]},{"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":14,"low":4.3,"high":14,"kind":"range","display":"4.3–14","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"4.3 - 14.0 pCi/l"},"federalStandard":{"type":"MCLG","value":0,"units":null,"enforceable":false},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":14,"low":4.3,"high":14,"kind":"range","display":"4.3–14","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"4.3 - 14.0 pCi/l"},{"value":14,"low":null,"high":null,"kind":"point","display":"14","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"14 pCi/l"}]}]}],"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":1.07,"low":0.94,"high":1.07,"kind":"range","display":"0.94–1.07","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"0.94 - 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16.00 ppb"},"federalStandard":{"type":"MCL","value":80,"units":null,"enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":16,"low":4.4,"high":16,"kind":"range","display":"4.4–16","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","rawVerbatim":"4.40 - 16.00 ppb"},{"value":12.9,"low":null,"high":null,"kind":"point","display":"12.9","units":null,"statisticType":"max","samplingContext":"plant:Average or Highest Single Test Result","rawVerbatim":"12.9 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":0.72,"low":0.69,"high":0.72,"kind":"range","display":"0.69–0.72","units":null,"statisticType":"range","samplingContext":"plant:of Detected Test Results","censored":false,"detectionLimit":null,"rawVerbatim":"0.69 - 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