{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T08:02:08.333Z"},"system":{"slug":"ca_sdwis_edt__CA3810011__2025","name":"SFPUC City Distribution Division","state":"CA","year":2025,"url":"https://www.thewatermap.com/water/ca/sfpuc-city-distribution-division/2025","apiUrl":"https://www.thewatermap.com/api/water/ca/sfpuc-city-distribution-division/2025","markdownUrl":"https://www.thewatermap.com/water/ca/sfpuc-city-distribution-division/2025/llms.txt","coordinates":{"latitude":37.7879363,"longitude":-122.4075201},"contaminantsMeasured":67,"contaminantsWithFederalLimit":51,"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":"bromodichloromethane","name":"Bromodichloromethane","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"A trihalomethane disinfection byproduct.","whyItMatters":"Counted within regulated total trihalomethanes; 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high levels can have a laxative effect and a bitter taste.","measured":{"value":31.430000000000003,"low":null,"high":null,"kind":"point","display":"31.430000000000003","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 6 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":{"type":"mcl","value":500,"units":"MG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":31.430000000000003,"low":null,"high":null,"kind":"point","display":"31.430000000000003","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 6 samples (DL/2 substitution for 0 non-detects)"},{"value":1.17,"low":null,"high":null,"kind":"point","display":"1.17","units":"MG/L","statisticType":"avg","samplingContext":"other","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},{"value":1.17,"low":null,"high":null,"kind":"point","display":"1.17","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 1.17 MG/L on 2025-06-11 (1/1 samples detected)"},{"value":46.5,"low":null,"high":null,"kind":"point","display":"46.5","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 46.5 MG/L on 2025-07-09 (6/6 samples detected)"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"analyteId":"aluminum","name":"Aluminum","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A common element sometimes used as a treatment coagulant.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels can discolor water.","measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":50,"rawVerbatim":"all 6 samples below DL (50.0 UG/L)"},"federalStandard":{"type":"mcl","value":1000,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (50.0 UG/L)"},{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"all 1 samples below DL (50.0 UG/L)"}]},{"analyteId":"antimony","name":"Antimony","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":6,"rawVerbatim":"all 6 samples below DL (6.0 UG/L)"},"federalStandard":{"type":"mcl","value":6,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (6.0 UG/L)"}]},{"analyteId":"arsenic","name":"Arsenic","family":"metal","familyLabel":"Metals","casrn":null,"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":1.17,"low":null,"high":null,"kind":"point","display":"1.17","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 6 samples (DL/2 substitution for 5 non-detects)"},"federalStandard":{"type":"mcl","value":10,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":2.02,"low":null,"high":null,"kind":"point","display":"2.02","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 2.02 UG/L on 2025-07-09 (1/6 samples detected)"},{"value":1.17,"low":null,"high":null,"kind":"point","display":"1.17","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 6 samples (DL/2 substitution for 5 non-detects)"}]},{"analyteId":"barium","name":"Barium","family":"metal","familyLabel":"Metals","casrn":null,"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":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":100,"rawVerbatim":"all 6 samples below DL (100.0 UG/L)"},"federalStandard":{"type":"mcl","value":1000,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (100.0 UG/L)"}]},{"analyteId":"beryllium","name":"Beryllium","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":1,"rawVerbatim":"all 6 samples below DL (1.0 UG/L)"},"federalStandard":{"type":"mcl","value":4,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (1.0 UG/L)"}]},{"analyteId":"cadmium","name":"Cadmium","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":1,"rawVerbatim":"all 6 samples below DL (1.0 UG/L)"},"federalStandard":{"type":"mcl","value":5,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (1.0 UG/L)"}]},{"analyteId":"calcium","name":"Calcium","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":28.95,"low":null,"high":null,"kind":"point","display":"28.95","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 6 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":3.19,"low":null,"high":null,"kind":"point","display":"3.19","units":"MG/L","statisticType":"avg","samplingContext":"other","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},{"value":3.19,"low":null,"high":null,"kind":"point","display":"3.19","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 3.19 MG/L on 2025-06-11 (1/1 samples detected)"},{"value":36.3,"low":null,"high":null,"kind":"point","display":"36.3","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 36.3 MG/L on 2025-07-09 (6/6 samples detected)"},{"value":28.95,"low":null,"high":null,"kind":"point","display":"28.95","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 6 samples (DL/2 substitution for 0 non-detects)"}]},{"analyteId":"chromium_hex","name":"Chromium, Hexavalent","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"Hexavalent chromium ('chromium-6') — the more toxic form of chromium.","whyItMatters":"A known carcinogen by inhalation; regulated nationally only within the total-chromium limit, with stricter limits in some states.","measured":{"value":16.276315789473685,"low":null,"high":null,"kind":"point","display":"16.276315789473685","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 19 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":{"type":"mcl","value":10,"units":"UG/L","enforceable":true},"status":{"key":"over","label":"At or above the limit"},"breakdowns":[],"measurements":[{"value":24.8,"low":null,"high":null,"kind":"point","display":"24.8","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 24.8 UG/L on 2025-10-14 (19/19 samples detected)"},{"value":16.276315789473685,"low":null,"high":null,"kind":"point","display":"16.276315789473685","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 19 samples (DL/2 substitution for 0 non-detects)"}]},{"analyteId":"copper","name":"Copper","family":"metal","familyLabel":"Metals","casrn":null,"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":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":50,"rawVerbatim":"all 6 samples below DL (50.0 UG/L)"},"federalStandard":{"type":"mcl","value":1000,"units":"UG/L","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"all 6 samples below DL (50.0 UG/L)"},{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"all 1 samples below DL (50.0 UG/L)"}]},{"analyteId":"iron","name":"Iron","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring metal common in groundwater.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; 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