{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-06-10T07:17:02.008Z"},"system":{"slug":"metro__142__ontario","name":"Ontario","state":"CA","year":2024,"url":"https://www.thewatermap.com/water/ca/ontario/2024","apiUrl":"https://www.thewatermap.com/api/water/ca/ontario/2024","markdownUrl":"https://www.thewatermap.com/water/ca/ontario/2024/llms.txt","coordinates":{"latitude":34.065846,"longitude":-117.64843},"contaminantsMeasured":42,"contaminantsWithFederalLimit":11,"contaminantsAtOrAboveLimit":0,"contaminantsApproachingLimit":1,"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 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infants.","measured":{"value":6.7,"low":null,"high":null,"kind":"point","display":"6.7","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"6.7 3.0 to 8.3"},"federalStandard":{"type":"MCL","value":10,"units":"mg/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":0.67},{"context":"zone:Purchased Groundwater CDA 2 (1110 Zone)","label":"Purchased Groundwater CDA 2 (1110 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":0.5},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":0.31},{"context":"plant:Local Groundwater","label":"Local 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6.1"},{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Imported Water (WFA w/ SAWCO)","rawVerbatim":"0.70 ND to 1.6"},{"value":2.7,"low":null,"high":null,"kind":"point","display":"2.7","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Local Groundwater","rawVerbatim":"2.7 1.2 to 5.5"}]},{"analyteId":"sulfate","name":"Sulfate","family":"inorganic","familyLabel":"Inorganic chemicals","casrn":"14808-79-8","whatItIs":"A naturally occurring mineral from rock and soil.","whyItMatters":"No health-based federal limit; high levels can have a laxative effect and a bitter taste.","measured":{"value":34,"low":null,"high":null,"kind":"point","display":"34","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Imported Water (WFA w/ SAWCO)","censored":false,"detectionLimit":null,"rawVerbatim":"34 21 to 51"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[{"context":"plant:Imported Water (WFA w/ SAWCO)","label":"Imported Water (WFA w/ SAWCO)","kind":"plant","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"plant:Local Groundwater","label":"Local Groundwater","kind":"plant","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 2 (1110 Zone)","label":"Purchased Groundwater CDA 2 (1110 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 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51"},{"value":12,"low":null,"high":null,"kind":"point","display":"12","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Local Groundwater","rawVerbatim":"12 6.8 to 18"}]}]},{"family":"metal","familyLabel":"Metals","contaminants":[{"analyteId":"aluminum","name":"Aluminum","family":"metal","familyLabel":"Metals","casrn":"7429-90-5","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":41,"low":null,"high":null,"kind":"point","display":"41","units":"ug/L","statisticType":"reported_level","samplingContext":"plant:Imported Water (WFA w/ SAWCO)","censored":false,"detectionLimit":null,"rawVerbatim":"41 ND to 93"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[{"context":"plant:Imported Water (WFA w/ SAWCO)","label":"Imported Water (WFA w/ 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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":0.57,"low":null,"high":null,"kind":"point","display":"0.57","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 1 (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"0.57 ND to 3.5"},"federalStandard":null,"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":0.57,"low":null,"high":null,"kind":"point","display":"0.57","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 1 (870 Zone)","rawVerbatim":"0.57 ND to 3.5"}]},{"analyteId":"barium","name":"Barium","family":"metal","familyLabel":"Metals","casrn":"7440-39-3","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":80,"low":null,"high":null,"kind":"point","display":"80","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"80 78 to 83"},"federalStandard":{"type":"MCL","value":2000,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"ug/L","average":null,"range":null,"ratio":0.04},{"context":"zone:Purchased Groundwater CDA 2 (1110 Zone)","label":"Purchased Groundwater CDA 2 (1110 Zone)","kind":"zone","units":"ug/L","average":null,"range":null,"ratio":0.0365},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 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taste.","measured":{"value":65,"low":null,"high":null,"kind":"point","display":"65","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"65 52 to 76"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 2 (1110 Zone)","label":"Purchased Groundwater CDA 2 (1110 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"plant:Local Groundwater","label":"Local Groundwater","kind":"plant","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"plant:Imported Water (WFA w/ SAWCO)","label":"Imported Water (WFA w/ SAWCO)","kind":"plant","units":"mg/L","average":null,"range":null,"ratio":null}],"measurements":[{"value":65,"low":null,"high":null,"kind":"point","display":"65","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","rawVerbatim":"65 52 to 76"},{"value":44,"low":null,"high":null,"kind":"point","display":"44","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 1 (870 Zone)","rawVerbatim":"44 32 to 55"},{"value":44,"low":null,"high":null,"kind":"point","display":"44","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 2 (1110 Zone)","rawVerbatim":"44 17 to 59"},{"value":39,"low":null,"high":null,"kind":"point","display":"39","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Local Groundwater","rawVerbatim":"39 27 to 46"},{"value":32,"low":null,"high":null,"kind":"point","display":"32","units":"mg/L","statisticType":"reported_level","samplingContext":"plant:Imported Water (WFA w/ SAWCO)","rawVerbatim":"32 15 to 60"}]},{"analyteId":"chromium_hex","name":"Chromium, Hexavalent","family":"metal","familyLabel":"Metals","casrn":"18540-29-9","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":2.2,"low":null,"high":null,"kind":"point","display":"2.2","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"2.2 1.0 to 2.1"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"ug/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 2 (1110 Zone)","label":"Purchased Groundwater CDA 2 (1110 Zone)","kind":"zone","units":"ug/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 Zone)","kind":"zone","units":"ug/L","average":null,"range":null,"ratio":null}],"measurements":[{"value":2.2,"low":null,"high":null,"kind":"point","display":"2.2","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","rawVerbatim":"2.2 1.0 to 2.1"},{"value":0.05,"low":null,"high":null,"kind":"point","display":"0.05","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 1 (870 Zone)","rawVerbatim":"0.05 ND to 0.6"},{"value":0.7,"low":null,"high":null,"kind":"point","display":"0.7","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater CDA 2 (1110 Zone)","rawVerbatim":"0.70 ND to 1.2"}]},{"analyteId":"copper","name":"Copper","family":"metal","familyLabel":"Metals","casrn":"7440-50-8","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":130,"low":null,"high":null,"kind":"point","display":"130","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:OMUC's Entire Distribution System","censored":false,"detectionLimit":null,"rawVerbatim":"90th percentile: 130 ppb (0 exceeded AL / 50 samples)"},"federalStandard":{"type":"AL","value":1300,"units":"ug/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":130,"low":null,"high":null,"kind":"point","display":"130","units":"ug/L","statisticType":"reported_level","samplingContext":"zone:OMUC's Entire Distribution System","rawVerbatim":"90th percentile: 130 ppb (0 exceeded AL / 50 samples)"}]},{"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. 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50"}]},{"analyteId":"calcium","name":"Calcium","family":"metal","familyLabel":"Metals","casrn":"7440-70-2","whatItIs":"A naturally occurring mineral that contributes to water hardness.","whyItMatters":"Not federally regulated for health; affects scaling and taste.","measured":{"value":65,"low":null,"high":null,"kind":"point","display":"65","units":"mg/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"65 52 to 76"},"federalStandard":null,"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[{"context":"zone:Purchased Groundwater JCSD (870 Zone)","label":"Purchased Groundwater JCSD (870 Zone)","kind":"zone","units":"mg/L","average":null,"range":null,"ratio":null},{"context":"zone:Purchased Groundwater CDA 1 (870 Zone)","label":"Purchased Groundwater CDA 1 (870 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1.2"},"federalStandard":{"type":"MCL","value":20,"units":"pCi/L","enforceable":true},"status":{"key":"detected","label":"Detected — no federal limit"},"breakdowns":[],"measurements":[{"value":0.63,"low":null,"high":null,"kind":"point","display":"0.63","units":"pCi/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","rawVerbatim":"0.63 ND to 1.2"}]},{"analyteId":"dbcp","name":"DBCP","family":"voc_pesticide","familyLabel":"VOCs & pesticides","casrn":"96-12-8","whatItIs":"1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide.","whyItMatters":"A probable human carcinogen; long-term exposure above the federal limit can cause reproductive harm.","measured":{"value":0.27,"low":null,"high":null,"kind":"point","display":"0.27","units":"ng/L","statisticType":"reported_level","samplingContext":"zone:Purchased Groundwater JCSD (870 Zone)","censored":false,"detectionLimit":null,"rawVerbatim":"0.27 ND to 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