{"dataset":{"name":"U.S. Drinking Water Quality — Contaminant Measurements","license":"https://creativecommons.org/licenses/by/4.0/","homepage":"https://www.thewatermap.com"},"meta":{"generatedAt":"2026-05-26T09:03:25.052Z"},"system":{"slug":"ca_sdwis_edt__CA1310700__2026","name":"Naf El Centro","state":"CA","year":2026,"url":"https://www.thewatermap.com/water/ca/naf-el-centro/2026","apiUrl":"https://www.thewatermap.com/api/water/ca/naf-el-centro/2026","markdownUrl":"https://www.thewatermap.com/water/ca/naf-el-centro/2026/llms.txt","coordinates":{"latitude":32.7947731,"longitude":-116.962526},"contaminantsMeasured":2,"contaminantsWithFederalLimit":2,"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 person before publishing."},"families":[{"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; 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