{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-06-04T00:37:37.006Z"},"system":{"slug":"ca__north-coast-county-water-dist__CA4110025","name":"North Coast County Water Dist — Pacifica, Ca","state":"CA","year":2023,"url":"https://www.thewatermap.com/water/ca/north-coast-county-water-dist-pacifica-ca/2023","apiUrl":"https://www.thewatermap.com/api/water/ca/north-coast-county-water-dist-pacifica-ca/2023","markdownUrl":"https://www.thewatermap.com/water/ca/north-coast-county-water-dist-pacifica-ca/2023/llms.txt","coordinates":{"latitude":37.5980374,"longitude":-122.4995234},"contaminantsMeasured":9,"contaminantsWithFederalLimit":3,"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":2.48,"low":null,"high":null,"kind":"point","display":"2.48","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.48"},"federalStandard":{"type":"MCL","value":4,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2.48,"low":null,"high":null,"kind":"point","display":"2.48","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"2.48"},{"value":3.5,"low":0.3,"high":3.5,"kind":"range","display":"0.3–3.5","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"0.3 - 3.5"}]}]},{"family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","contaminants":[{"analyteId":"bromate","name":"Bromate","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":"15541-45-4","whatItIs":"A disinfection byproduct formed when bromide-containing water is treated with ozone.","whyItMatters":"Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"[3]"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.9,"low":0,"high":5.9,"kind":"range","display":"0–5.9","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 5.9"},{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"[3]"}]},{"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":25.8,"low":null,"high":null,"kind":"point","display":"25.8","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"25.8"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":25.8,"low":null,"high":null,"kind":"point","display":"25.8","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"25.8"},{"value":38.1,"low":9,"high":38.1,"kind":"range","display":"9–38.1","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"9.0 - 38.1"}]},{"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":33.9,"low":null,"high":null,"kind":"point","display":"33.9","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"33.9"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":42.9,"low":14.7,"high":42.9,"kind":"range","display":"14.7–42.9","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"14.7 - 42.9"},{"value":33.9,"low":null,"high":null,"kind":"point","display":"33.9","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"33.9"}]}]},{"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":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":{"type":"MCL","value":4,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"},{"value":0.8,"low":0,"high":0.8,"kind":"range","display":"0–0.8","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.8"}]},{"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,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"mg/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":{"type":"MCL","value":10,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"},{"value":0.4,"low":0,"high":0.4,"kind":"range","display":"0–0.4","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.4"}]}]},{"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":217.5,"low":null,"high":null,"kind":"point","display":"217.5","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","censored":false,"detectionLimit":null,"rawVerbatim":"217.5"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":217.5,"low":null,"high":null,"kind":"point","display":"217.5","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","rawVerbatim":"217.5"},{"value":779,"low":11.7,"high":779,"kind":"range","display":"11.7–779","units":"ug/L","statisticType":"range","samplingContext":"at_the_tap","rawVerbatim":"11.7 - 779"}]},{"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":2.41,"low":null,"high":null,"kind":"point","display":"2.41","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","censored":false,"detectionLimit":null,"rawVerbatim":"2.41"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.6,"low":0,"high":5.6,"kind":"range","display":"0–5.6","units":"ug/L","statisticType":"range","samplingContext":"at_the_tap","rawVerbatim":"<1 -5.6"},{"value":2.41,"low":null,"high":null,"kind":"point","display":"2.41","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","rawVerbatim":"2.41"}]}]},{"family":"other","familyLabel":"Other","contaminants":[{"analyteId":"chromium","name":"Chromium","family":"other","familyLabel":"Other","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":0.1,"low":null,"high":null,"kind":"point","display":"0.1","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.1"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.1,"low":null,"high":null,"kind":"point","display":"0.1","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.1"},{"value":0.2,"low":0,"high":0.2,"kind":"range","display":"0–0.2","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.2"}]}]}],"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":2.48,"low":null,"high":null,"kind":"point","display":"2.48","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"2.48"},"federalStandard":{"type":"MCL","value":4,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2.48,"low":null,"high":null,"kind":"point","display":"2.48","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"2.48"},{"value":3.5,"low":0.3,"high":3.5,"kind":"range","display":"0.3–3.5","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"0.3 - 3.5"}]},{"analyteId":"bromate","name":"Bromate","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":"15541-45-4","whatItIs":"A disinfection byproduct formed when bromide-containing water is treated with ozone.","whyItMatters":"Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.","measured":{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"[3]"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.9,"low":0,"high":5.9,"kind":"range","display":"0–5.9","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 5.9"},{"value":3,"low":null,"high":null,"kind":"point","display":"3","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"[3]"}]},{"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":25.8,"low":null,"high":null,"kind":"point","display":"25.8","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"25.8"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":25.8,"low":null,"high":null,"kind":"point","display":"25.8","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"25.8"},{"value":38.1,"low":9,"high":38.1,"kind":"range","display":"9–38.1","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"9.0 - 38.1"}]},{"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":33.9,"low":null,"high":null,"kind":"point","display":"33.9","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"33.9"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":42.9,"low":14.7,"high":42.9,"kind":"range","display":"14.7–42.9","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"14.7 - 42.9"},{"value":33.9,"low":null,"high":null,"kind":"point","display":"33.9","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"33.9"}]},{"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":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"mg/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.3"},"federalStandard":{"type":"MCL","value":4,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.3,"low":null,"high":null,"kind":"point","display":"0.3","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.3"},{"value":0.8,"low":0,"high":0.8,"kind":"range","display":"0–0.8","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.8"}]},{"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,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"mg/L","statisticType":"average","samplingContext":"system","censored":true,"detectionLimit":null,"rawVerbatim":"ND"},"federalStandard":{"type":"MCL","value":10,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"mg/L","statisticType":"average","samplingContext":"system","rawVerbatim":"ND"},{"value":0.4,"low":0,"high":0.4,"kind":"range","display":"0–0.4","units":"mg/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.4"}]},{"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":217.5,"low":null,"high":null,"kind":"point","display":"217.5","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","censored":false,"detectionLimit":null,"rawVerbatim":"217.5"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":217.5,"low":null,"high":null,"kind":"point","display":"217.5","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","rawVerbatim":"217.5"},{"value":779,"low":11.7,"high":779,"kind":"range","display":"11.7–779","units":"ug/L","statisticType":"range","samplingContext":"at_the_tap","rawVerbatim":"11.7 - 779"}]},{"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":2.41,"low":null,"high":null,"kind":"point","display":"2.41","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","censored":false,"detectionLimit":null,"rawVerbatim":"2.41"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":5.6,"low":0,"high":5.6,"kind":"range","display":"0–5.6","units":"ug/L","statisticType":"range","samplingContext":"at_the_tap","rawVerbatim":"<1 -5.6"},{"value":2.41,"low":null,"high":null,"kind":"point","display":"2.41","units":"ug/L","statisticType":"p90","samplingContext":"at_the_tap","rawVerbatim":"2.41"}]},{"analyteId":"chromium","name":"Chromium","family":"other","familyLabel":"Other","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":0.1,"low":null,"high":null,"kind":"point","display":"0.1","units":"ug/L","statisticType":"average","samplingContext":"system","censored":false,"detectionLimit":null,"rawVerbatim":"0.1"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.1,"low":null,"high":null,"kind":"point","display":"0.1","units":"ug/L","statisticType":"average","samplingContext":"system","rawVerbatim":"0.1"},{"value":0.2,"low":0,"high":0.2,"kind":"range","display":"0–0.2","units":"ug/L","statisticType":"range","samplingContext":"plant:or Level Found","rawVerbatim":"ND - 0.2"}]}]}}