{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T09:04:26.291Z"},"system":{"slug":"ca_sdwis_edt__CA3710020__2026","name":"San Diego, City of","state":"CA","year":2026,"url":"https://www.thewatermap.com/water/ca/san-diego/2026","apiUrl":"https://www.thewatermap.com/api/water/ca/san-diego/2026","markdownUrl":"https://www.thewatermap.com/water/ca/san-diego/2026/llms.txt","coordinates":{"latitude":32.7174202,"longitude":-117.162772},"contaminantsMeasured":83,"contaminantsWithFederalLimit":40,"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 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states.","measured":{"value":0.48,"low":null,"high":null,"kind":"point","display":"0.48","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 5 samples (DL/2 substitution for 4 non-detects)"},"federalStandard":{"type":"mcl","value":6,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.48,"low":null,"high":null,"kind":"point","display":"0.48","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 5 samples (DL/2 substitution for 4 non-detects)"},{"value":1.4,"low":null,"high":null,"kind":"point","display":"1.4","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 1.4 UG/L on 2026-02-18 (1/5 samples detected)"}]},{"analyteId":"tthm","name":"TTHM","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"Total 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chemicals","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":0.0295,"low":null,"high":null,"kind":"point","display":"0.0295","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 2 samples (DL/2 substitution for 1 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.044,"low":null,"high":null,"kind":"point","display":"0.044","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 0.044 MG/L on 2026-02-11 (1/2 samples detected)"},{"value":0.0295,"low":null,"high":null,"kind":"point","display":"0.0295","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 2 samples (DL/2 substitution for 1 non-detects)"}]},{"analyteId":"asbestos","name":"Asbestos","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":null,"whatItIs":null,"whyItMatters":null,"measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"MFL","statisticType":"max_single","samplingContext":"distribution","censored":true,"detectionLimit":0.2,"rawVerbatim":"all 1 samples below DL (0.2 MFL)"},"federalStandard":{"type":"mcl","value":7,"units":"MFL","enforceable":true},"status":{"key":"none","label":"None detected"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"MFL","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"all 1 samples below DL (0.2 MFL)"}]},{"analyteId":"bromide","name":"Bromide","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":null,"whatItIs":"A naturally occurring salt found in source water.","whyItMatters":"Not directly regulated, but a precursor that increases formation of brominated disinfection 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limit"},"breakdowns":[],"measurements":[{"value":0.17666666666666667,"low":null,"high":null,"kind":"point","display":"0.17666666666666667","units":"MG/L","statisticType":"avg","samplingContext":"other","rawVerbatim":"avg over 6 samples (DL/2 substitution for 0 non-detects)"},{"value":0.25725,"low":null,"high":null,"kind":"point","display":"0.25725","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 4 samples (DL/2 substitution for 0 non-detects)"},{"value":0.227,"low":null,"high":null,"kind":"point","display":"0.227","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 0.227 MG/L on 2026-01-05 (6/6 samples detected)"},{"value":0.732,"low":null,"high":null,"kind":"point","display":"0.732","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 0.732 MG/L on 2026-01-05 (6/6 samples 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