{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T09:14:26.417Z"},"system":{"slug":"ca_sdwis_edt__CA3310009__2023","name":"Eastern Municipal Wd","state":"CA","year":2023,"url":"https://www.thewatermap.com/water/ca/eastern-municipal-wd/2023","apiUrl":"https://www.thewatermap.com/api/water/ca/eastern-municipal-wd/2023","markdownUrl":"https://www.thewatermap.com/water/ca/eastern-municipal-wd/2023/llms.txt","coordinates":{"latitude":33.6863987,"longitude":-117.1778599},"contaminantsMeasured":123,"contaminantsWithFederalLimit":79,"contaminantsAtOrAboveLimit":3,"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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detected)"},{"value":44,"low":null,"high":null,"kind":"point","display":"44","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 44.0 UG/L on 2023-05-01 (20/27 samples detected)"},{"value":10.254166666666666,"low":null,"high":null,"kind":"point","display":"10.254166666666666","units":"UG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 48 samples (DL/2 substitution for 3 non-detects)"}]},{"analyteId":"dibromochloromethane","name":"Dibromochloromethane","family":"disinfection_byproduct","familyLabel":"Disinfection byproducts","casrn":null,"whatItIs":"A trihalomethane disinfection byproduct.","whyItMatters":"Part of regulated total trihalomethanes; long-term exposure is linked to nervous-system, liver, and kidney 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non-detects)"},{"value":5,"low":null,"high":null,"kind":"point","display":"5","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 5.0 UG/L on 2023-01-04 (49/66 samples detected)"},{"value":0.4604166666666667,"low":null,"high":null,"kind":"point","display":"0.4604166666666667","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 24 samples (DL/2 substitution for 5 non-detects)"}]},{"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":41.87083333333333,"low":null,"high":null,"kind":"point","display":"41.87083333333333","units":"UG/L","statisticType":"avg","samplingContext":"distribution","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 48 samples (DL/2 substitution for 1 non-detects)"},"federalStandard":{"type":"mcl","value":80,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":89,"low":null,"high":null,"kind":"point","display":"89","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 89.0 UG/L on 2023-09-20 (47/48 samples detected)"},{"value":65,"low":null,"high":null,"kind":"point","display":"65","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 65.0 UG/L on 2023-09-05 (22/24 samples detected)"},{"value":41.87083333333333,"low":null,"high":null,"kind":"point","display":"41.87083333333333","units":"UG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 48 samples (DL/2 substitution for 1 non-detects)"},{"value":35.041666666666664,"low":null,"high":null,"kind":"point","display":"35.041666666666664","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 24 samples (DL/2 substitution for 2 non-detects)"}]}]},{"family":"inorganic","familyLabel":"Inorganic chemicals","contaminants":[{"analyteId":"chloride","name":"Chloride","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":null,"whatItIs":"A naturally occurring salt compound.","whyItMatters":"Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode 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non-detects)"},{"value":647.3885509838998,"low":null,"high":null,"kind":"point","display":"647.3885509838998","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 559 samples (DL/2 substitution for 0 non-detects)"},{"value":124,"low":null,"high":null,"kind":"point","display":"124","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 124.0 MG/L on 2023-05-01 (126/126 samples detected)"},{"value":108,"low":null,"high":null,"kind":"point","display":"108","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 108.0 MG/L on 2023-03-07 (24/24 samples detected)"},{"value":2000,"low":null,"high":null,"kind":"point","display":"2000","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 2000.0 MG/L on 2023-05-03 (559/559 samples 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detected)"},{"value":0.35,"low":null,"high":null,"kind":"point","display":"0.35","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 0.35 MG/L on 2023-09-05 (31/126 samples detected)"}]},{"analyteId":"nitrate","name":"Nitrate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":null,"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":6.142894736842106,"low":null,"high":null,"kind":"point","display":"6.142894736842106","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 76 samples (DL/2 substitution for 5 non-detects)"},"federalStandard":{"type":"mcl","value":10,"units":"MG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":11.3,"low":null,"high":null,"kind":"point","display":"11.3","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 11.3 MG/L on 2023-07-05 (71/76 samples detected)"},{"value":0.8,"low":null,"high":null,"kind":"point","display":"0.8","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 0.8 MG/L on 2023-04-03 (3/24 samples detected)"},{"value":6.09,"low":null,"high":null,"kind":"point","display":"6.09","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 6.09 MG/L on 2023-10-02 (144/203 samples detected)"},{"value":1.0201970443349753,"low":null,"high":null,"kind":"point","display":"1.0201970443349753","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 203 samples (DL/2 substitution for 59 non-detects)"},{"value":6.142894736842106,"low":null,"high":null,"kind":"point","display":"6.142894736842106","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 76 samples (DL/2 substitution for 5 non-detects)"},{"value":0.25583333333333336,"low":null,"high":null,"kind":"point","display":"0.25583333333333336","units":"MG/L","statisticType":"avg","samplingContext":"other","rawVerbatim":"avg over 24 samples (DL/2 substitution for 21 non-detects)"}]},{"analyteId":"nitrite","name":"Nitrite","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":null,"whatItIs":"A compound from fertilizer runoff, sewage, and erosion of natural deposits.","whyItMatters":"Like nitrate, elevated levels can cause 'blue baby syndrome' in infants.","measured":{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"MG/L","statisticType":"max_single","samplingContext":"source","censored":true,"detectionLimit":0.1,"rawVerbatim":"all 76 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non-detects)"},{"value":69.3625,"low":null,"high":null,"kind":"point","display":"69.3625","units":"MG/L","statisticType":"avg","samplingContext":"other","rawVerbatim":"avg over 24 samples (DL/2 substitution for 0 non-detects)"},{"value":487,"low":null,"high":null,"kind":"point","display":"487","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 487.0 MG/L on 2023-07-03 (28/28 samples detected)"},{"value":239,"low":null,"high":null,"kind":"point","display":"239","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 239.0 MG/L on 2023-03-07 (24/24 samples detected)"},{"value":238,"low":null,"high":null,"kind":"point","display":"238","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 238.0 MG/L on 2023-10-18 (126/126 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":7.216666666666667,"low":null,"high":null,"kind":"point","display":"7.216666666666667","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 27 samples (DL/2 substitution for 7 non-detects)"},"federalStandard":{"type":"mcl","value":1000,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":91.4,"low":null,"high":null,"kind":"point","display":"91.4","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 91.4 UG/L on 2023-07-07 (6/28 samples 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