{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T08:15:03.037Z"},"system":{"slug":"ca_sdwis_edt__CA1910124__2025","name":"Pasadena Water and Power","state":"CA","year":2025,"url":"https://www.thewatermap.com/water/ca/pasadena-water-and-power/2025","apiUrl":"https://www.thewatermap.com/api/water/ca/pasadena-water-and-power/2025","markdownUrl":"https://www.thewatermap.com/water/ca/pasadena-water-and-power/2025/llms.txt","coordinates":{"latitude":34.1476507,"longitude":-118.144155},"contaminantsMeasured":115,"contaminantsWithFederalLimit":82,"contaminantsAtOrAboveLimit":0,"contaminantsApproachingLimit":2,"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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over 80 samples (DL/2 substitution for 0 non-detects)"},{"value":1.1953225806451613,"low":null,"high":null,"kind":"point","display":"1.1953225806451613","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 186 samples (DL/2 substitution for 154 non-detects)"},{"value":21,"low":null,"high":null,"kind":"point","display":"21","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 21.0 UG/L on 2025-07-16 (80/80 samples 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":7.5,"low":null,"high":null,"kind":"point","display":"7.5","units":"UG/L","statisticType":"avg","samplingContext":"distribution","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 32 samples (DL/2 substitution for 16 non-detects)"},"federalStandard":{"type":"mcl","value":60,"units":"UG/L","enforceable":true},"status":{"key":"under","label":"Within the limit"},"breakdowns":[],"measurements":[{"value":7.5,"low":null,"high":null,"kind":"point","display":"7.5","units":"UG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 32 samples (DL/2 substitution for 16 non-detects)"},{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 25.0 UG/L on 2025-07-16 (16/32 samples detected)"}]},{"analyteId":"perchlorate","name":"Perchlorate","family":"disinfection_byproduct","familyLabel":"Disinfection 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non-detects)"},{"value":3.1703003003003003,"low":null,"high":null,"kind":"point","display":"3.1703003003003003","units":"UG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 333 samples (DL/2 substitution for 0 non-detects)"},{"value":9.83,"low":null,"high":null,"kind":"point","display":"9.83","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 9.83 UG/L on 2025-11-04 (333/333 samples detected)"},{"value":3.69,"low":null,"high":null,"kind":"point","display":"3.69","units":"UG/L","statisticType":"max_single","samplingContext":"entry_point","rawVerbatim":"max detection 3.69 UG/L on 2025-03-24 (81/173 samples detected)"}]},{"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 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samples detected)"},{"value":28.727875,"low":null,"high":null,"kind":"point","display":"28.727875","units":"UG/L","statisticType":"avg","samplingContext":"distribution","rawVerbatim":"avg over 80 samples (DL/2 substitution for 0 non-detects)"},{"value":3.1386021505376345,"low":null,"high":null,"kind":"point","display":"3.1386021505376345","units":"UG/L","statisticType":"avg","samplingContext":"entry_point","rawVerbatim":"avg over 186 samples (DL/2 substitution for 59 non-detects)"},{"value":3.06,"low":null,"high":null,"kind":"point","display":"3.06","units":"UG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 3.06 UG/L on 2025-06-03 (79/163 samples detected)"},{"value":80,"low":null,"high":null,"kind":"point","display":"80","units":"UG/L","statisticType":"max_single","samplingContext":"distribution","rawVerbatim":"max detection 80.0 UG/L on 2025-10-08 (80/80 samples detected)"}]}]},{"family":"inorganic","familyLabel":"Inorganic 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(cosmetic) standard; high levels cause a salty taste and can corrode pipes.","measured":{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"MG/L","statisticType":"avg","samplingContext":"source","censored":false,"detectionLimit":null,"rawVerbatim":"avg over 1 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":25,"low":null,"high":null,"kind":"point","display":"25","units":"MG/L","statisticType":"max_single","samplingContext":"source","rawVerbatim":"max detection 25.0 MG/L on 2025-02-27 (1/1 samples detected)"},{"value":25,"low":null,"high":null,"kind":"point","display":"25","units":"MG/L","statisticType":"avg","samplingContext":"source","rawVerbatim":"avg over 1 samples (DL/2 substitution for 0 non-detects)"}]},{"analyteId":"cyanide","name":"Cyanide","family":"inorganic","familyLabel":"Inorganic 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