{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-07-26T02:13:41.791Z"},"system":{"slug":"ca__foresthill-public-utility-dist__CA3110003","name":"Foresthill Public Utility Dist — Foresthill, Ca","state":"CA","year":2023,"url":"https://www.thewatermap.com/water/ca/foresthill-public-utility-dist-foresthill-ca/2023","apiUrl":"https://www.thewatermap.com/api/water/ca/foresthill-public-utility-dist-foresthill-ca/2023","markdownUrl":"https://www.thewatermap.com/water/ca/foresthill-public-utility-dist-foresthill-ca/2023/llms.txt","coordinates":{"latitude":39.0019935,"longitude":-120.8254018},"contaminantsMeasured":5,"contaminantsWithFederalLimit":2,"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":"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":15.6,"low":14.4,"high":15.6,"kind":"range","display":"14.4–15.6","units":"ug/L","statisticType":"range","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"14.4-15.6"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":15,"low":null,"high":null,"kind":"point","display":"15","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"15"},{"value":15.6,"low":14.4,"high":15.6,"kind":"range","display":"14.4–15.6","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"14.4-15.6"}]},{"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":18,"low":null,"high":null,"kind":"point","display":"18","units":"ug/L","statisticType":"reported_level","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"18"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":18,"low":null,"high":null,"kind":"point","display":"18","units":"ug/L","statisticType":"reported_level","samplingContext":"system","rawVerbatim":"18"},{"value":18,"low":17,"high":18,"kind":"range","display":"17–18","units":"ug/L","statisticType":"range","samplingContext":"system","rawVerbatim":"17-18"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"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":"point","display":"0","units":"mg/L","statisticType":"p90","samplingContext":"at_the_tap","censored":false,"detectionLimit":null,"rawVerbatim":"0.00"},"federalStandard":{"type":"AL","value":1.3,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"point","display":"0","units":"mg/L","statisticType":"p90","samplingContext":"at_the_tap","rawVerbatim":"0.00"},{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"ug/L","statisticType":"reported_level","samplingContext":"plant:No. of Samples Collected","rawVerbatim":"25"}]},{"analyteId":"lead","name":"Lead","family":"metal","familyLabel":"Metals","casrn":null,"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. 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