{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T09:18:26.389Z"},"system":{"slug":"ca_sdwis_edt__CA3310036__2026","name":"Western MWD - Murrieta Division","state":"CA","year":2026,"url":"https://www.thewatermap.com/water/ca/western-mwd-murrieta-division/2026","apiUrl":"https://www.thewatermap.com/api/water/ca/western-mwd-murrieta-division/2026","markdownUrl":"https://www.thewatermap.com/water/ca/western-mwd-murrieta-division/2026/llms.txt","coordinates":{"latitude":33.560832,"longitude":-117.210656},"contaminantsMeasured":33,"contaminantsWithFederalLimit":17,"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 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detected)"}]},{"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":6,"low":null,"high":null,"kind":"point","display":"6","units":"UG/L","statisticType":"avg","samplingContext":"distribution","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 4 samples (DL/2 substitution for 3 non-detects)"},"federalStandard":{"type":"mcl","value":60,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":15,"low":null,"high":null,"kind":"point","display":"15","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 15.0 UG/L on 2026-02-02 (1/4 samples 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non-detects)"},{"value":0.48250000000000004,"low":null,"high":null,"kind":"point","display":"0.48250000000000004","units":"MG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 4 samples (DL/2 substitution for 0 non-detects)"},{"value":0.65,"low":null,"high":null,"kind":"point","display":"0.65","units":"MG/L","statisticType":"max_single","samplingContext":"other","rawVerbatim":"max detection 0.65 MG/L on 2026-03-04 (3/3 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 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limit"},"breakdowns":[],"measurements":[{"value":69.5,"low":null,"high":null,"kind":"point","display":"69.5","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 4 samples (DL/2 substitution for 0 non-detects)"},{"value":82,"low":null,"high":null,"kind":"point","display":"82","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},{"value":80,"low":null,"high":null,"kind":"point","display":"80","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 80.0 MG/L on 2026-01-07 (4/4 samples detected)"},{"value":82,"low":null,"high":null,"kind":"point","display":"82","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 82.0 MG/L on 2026-01-07 (1/1 samples detected)"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"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":3.176470588235294,"low":null,"high":null,"kind":"point","display":"3.176470588235294","units":"UG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 17 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":{"type":"mcl","value":10,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":3.9,"low":null,"high":null,"kind":"point","display":"3.9","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 3.9 UG/L on 2026-01-07 (17/17 samples detected)"},{"value":3.176470588235294,"low":null,"high":null,"kind":"point","display":"3.176470588235294","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 17 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":41.75,"low":null,"high":null,"kind":"point","display":"41.75","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","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":81,"low":null,"high":null,"kind":"point","display":"81","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 81.0 MG/L on 2026-01-07 (1/2 samples detected)"},{"value":20.25,"low":null,"high":null,"kind":"point","display":"20.25","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 8 samples (DL/2 substitution for 4 non-detects)"},{"value":41.75,"low":null,"high":null,"kind":"point","display":"41.75","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 2 samples (DL/2 substitution for 1 non-detects)"},{"value":84,"low":null,"high":null,"kind":"point","display":"84","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 84.0 MG/L on 2026-01-07 (4/8 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":8.5,"low":null,"high":null,"kind":"point","display":"8.5","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":{"type":"mcl","value":1000,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":3.3,"low":null,"high":null,"kind":"point","display":"3.3","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 4 samples (DL/2 substitution for 3 non-detects)"},{"value":8.5,"low":null,"high":null,"kind":"point","display":"8.5","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},{"value":5.7,"low":null,"high":null,"kind":"point","display":"5.7","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 5.7 UG/L on 2026-01-07 (1/4 samples detected)"},{"value":8.5,"low":null,"high":null,"kind":"point","display":"8.5","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 8.5 UG/L on 2026-01-07 (1/1 samples detected)"}]},{"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 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water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":20,"low":null,"high":null,"kind":"point","display":"20","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":20,"low":null,"high":null,"kind":"point","display":"20","units":"MG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 20.0 MG/L on 2026-01-07 (1/1 samples detected)"},{"value":20,"low":null,"high":null,"kind":"point","display":"20","units":"MG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 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non-detects)"},"federalStandard":{"type":"mcl","value":50,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 39.0 UG/L on 2026-01-07 (1/4 samples detected)"},{"value":13.5,"low":null,"high":null,"kind":"point","display":"13.5","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 4 samples (DL/2 substitution for 3 non-detects)"},{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"all 1 samples below DL (10.0 UG/L)"},{"value":null,"low":null,"high":null,"kind":"non_detect","display":"Not detected","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"all 12 samples 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