{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T09:03:25.497Z"},"system":{"slug":"ca_sdwis_edt__CA3310032__2023","name":"San Jacinto, City of","state":"CA","year":2023,"url":"https://www.thewatermap.com/water/ca/san-jacinto/2023","apiUrl":"https://www.thewatermap.com/api/water/ca/san-jacinto/2023","markdownUrl":"https://www.thewatermap.com/water/ca/san-jacinto/2023/llms.txt","coordinates":{"latitude":33.7839664,"longitude":-116.9589086},"contaminantsMeasured":32,"contaminantsWithFederalLimit":15,"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":31.433333333333334,"low":null,"high":null,"kind":"point","display":"31.433333333333334","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 3 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":57.3,"low":null,"high":null,"kind":"point","display":"57.3","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 57.3 MG/L on 2023-08-09 (3/3 samples detected)"},{"value":31.433333333333334,"low":null,"high":null,"kind":"point","display":"31.433333333333334","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"analyteId":"boron","name":"Boron","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring element from rock and soil.","whyItMatters":"No enforceable federal limit; the EPA has issued a health advisory level.","measured":{"value":18,"low":null,"high":null,"kind":"point","display":"18","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":19,"low":null,"high":null,"kind":"point","display":"19","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 19.0 UG/L on 2023-08-09 (3/3 samples detected)"},{"value":18,"low":null,"high":null,"kind":"point","display":"18","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"}]},{"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":30.2,"low":null,"high":null,"kind":"point","display":"30.2","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 6 samples (DL/2 substitution for 3 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":30.2,"low":null,"high":null,"kind":"point","display":"30.2","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 6 samples (DL/2 substitution for 3 non-detects)"},{"value":73.2,"low":null,"high":null,"kind":"point","display":"73.2","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 73.2 MG/L on 2023-08-09 (3/6 samples detected)"}]},{"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":200,"low":null,"high":null,"kind":"point","display":"200","units":"UG/L","statisticType":"p90","samplingContext":"distribution","censored":false,"detectionLimit":null,"rawVerbatim":"90th percentile of 51 LCR Tap samples"},"federalStandard":{"type":"al","value":1300,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":600,"low":null,"high":null,"kind":"point","display":"600","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 600.0 UG/L on 2023-06-21 (51/51 samples detected)"},{"value":43.8,"low":null,"high":null,"kind":"point","display":"43.8","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 43.8 UG/L on 2023-08-09 (2/3 samples detected)"},{"value":14.933333333333332,"low":null,"high":null,"kind":"point","display":"14.933333333333332","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 3 samples (DL/2 substitution for 1 non-detects)"},{"value":97.23137254901961,"low":null,"high":null,"kind":"point","display":"97.23137254901961","units":"UG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 51 samples (DL/2 substitution for 0 non-detects)"},{"value":200,"low":null,"high":null,"kind":"point","display":"200","units":"UG/L","statisticType":"p90","samplingContext":"distribution","rawVerbatim":"90th percentile of 51 LCR Tap samples"}]},{"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; causes rusty color, staining, and metallic taste.","measured":{"value":70.65384615384616,"low":null,"high":null,"kind":"point","display":"70.65384615384616","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 26 samples (DL/2 substitution for 3 non-detects)"},"federalStandard":{"type":"mcl","value":300,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"all 24 samples below DL (50.0 UG/L)"},{"value":70.65384615384616,"low":null,"high":null,"kind":"point","display":"70.65384615384616","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 26 samples (DL/2 substitution for 3 non-detects)"},{"value":110,"low":null,"high":null,"kind":"point","display":"110","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 110.0 UG/L on 2023-07-05 (23/26 samples detected)"}]},{"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. The EPA sets an action level, not a health goal above zero.","measured":{"value":1.660000000000001,"low":null,"high":null,"kind":"point","display":"1.660000000000001","units":"UG/L","statisticType":"p90","samplingContext":"distribution","censored":false,"detectionLimit":null,"rawVerbatim":"90th percentile of 38 LCR Tap samples"},"federalStandard":{"type":"al","value":15,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":3.4,"low":null,"high":null,"kind":"point","display":"3.4","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 3.4 UG/L on 2023-06-14 (7/38 samples detected)"},{"value":1.660000000000001,"low":null,"high":null,"kind":"point","display":"1.660000000000001","units":"UG/L","statisticType":"p90","samplingContext":"distribution","rawVerbatim":"90th percentile of 38 LCR Tap 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over 26 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":{"type":"mcl","value":50,"units":"UG/L","enforceable":true},"status":{"key":"over","label":"At or above the limit"},"breakdowns":[],"measurements":[{"value":160,"low":null,"high":null,"kind":"point","display":"160","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 160.0 UG/L on 2023-07-05 (26/26 samples detected)"},{"value":7.375,"low":null,"high":null,"kind":"point","display":"7.375","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 24 samples (DL/2 substitution for 18 non-detects)"},{"value":77.20769230769231,"low":null,"high":null,"kind":"point","display":"77.20769230769231","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 26 samples (DL/2 substitution for 0 non-detects)"},{"value":22,"low":null,"high":null,"kind":"point","display":"22","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 22.0 UG/L on 2023-03-01 (6/24 samples detected)"}]},{"analyteId":"potassium","name":"Potassium","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"Not federally regulated for health.","measured":{"value":3.546666666666667,"low":null,"high":null,"kind":"point","display":"3.546666666666667","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":4.13,"low":null,"high":null,"kind":"point","display":"4.13","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 4.13 MG/L on 2023-08-09 (3/3 samples detected)"},{"value":3.546666666666667,"low":null,"high":null,"kind":"point","display":"3.546666666666667","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"}]},{"analyteId":"silica","name":"Silica","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring compound from sand and rock.","whyItMatters":"Not federally regulated for health; relevant mainly for industrial water use.","measured":{"value":24,"low":null,"high":null,"kind":"point","display":"24","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":24,"low":null,"high":null,"kind":"point","display":"24","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 3 samples (DL/2 substitution for 0 non-detects)"},{"value":24.3,"low":null,"high":null,"kind":"point","display":"24.3","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 24.3 MG/L on 2023-08-09 (3/3 samples detected)"}]},{"analyteId":"sodium","name":"Sodium","family":"metal","familyLabel":"Metals","casrn":null,"whatItIs":"A naturally occurring salt component.","whyItMatters":"Not federally regulated for health; relevant for people on sodium-restricted 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