{
  "generated": "2026-09-22",
  "source": "State Water Resources Control Board, Division of Drinking Water - EDT Library (SDWIS extracts SDWIS3 2019-2022, SDWIS4 2023-2025, SDWIS5 2026-present, downloaded 2026-09-22), filtered to Plumas County systems",
  "how_we_got_here": "Our records request to DDW District 62 (PRA ID #638) was answered on 2026-09-17 by pointing to these public bulk files rather than producing a county extract; we pulled and filtered them ourselves.",
  "rows": 15037,
  "systems": 184,
  "date_range": [
    "2019-01-02",
    "2026-07-01"
  ],
  "distinct_analytes": 174,
  "top_analytes": [
    [
      "NITRATE",
      1414
    ],
    [
      "ARSENIC",
      561
    ],
    [
      "COPPER, FREE",
      526
    ],
    [
      "LEAD",
      492
    ],
    [
      "NITRITE",
      484
    ],
    [
      "IRON",
      279
    ],
    [
      "MANGANESE",
      272
    ],
    [
      "PERCHLORATE",
      184
    ],
    [
      "GROSS ALPHA PARTICLE ACTIVITY",
      153
    ],
    [
      "NITRATE-NITRITE",
      138
    ],
    [
      "CHLOROFORM",
      130
    ],
    [
      "BROMODICHLOROMETHANE",
      130
    ],
    [
      "BROMOFORM",
      130
    ],
    [
      "DIBROMOCHLOROMETHANE",
      130
    ],
    [
      "TTHM",
      126
    ],
    [
      "COMBINED URANIUM",
      111
    ],
    [
      "CONDUCTIVITY @ 25 C UMHOS/CM",
      104
    ],
    [
      "RADIUM-228",
      104
    ],
    [
      "FLUORIDE",
      98
    ],
    [
      "ALKALINITY, TOTAL",
      92
    ],
    [
      "BENZENE",
      92
    ],
    [
      "HYDROXIDE AS CALCIUM CARBONATE",
      91
    ],
    [
      "ALKALINITY, CARBONATE",
      91
    ],
    [
      "ALKALINITY, BICARBONATE",
      91
    ],
    [
      "1,2-DICHLOROETHANE",
      90
    ]
  ],
  "herbicides": {
    "glyphosate": {
      "analyte_names": [
        "GLYPHOSATE"
      ],
      "samples": 14,
      "systems_tested": 1,
      "first_sample": "2019-11-12",
      "last_sample": "2025-01-27",
      "detections_above_reporting_level": 0,
      "detections": [],
      "mcl_values_seen": [
        "700"
      ],
      "dlr_values_seen": [
        "25"
      ]
    },
    "atrazine": {
      "analyte_names": [
        "ATRAZINE"
      ],
      "samples": 14,
      "systems_tested": 1,
      "first_sample": "2019-11-12",
      "last_sample": "2025-02-25",
      "detections_above_reporting_level": 0,
      "detections": [],
      "mcl_values_seen": [
        "1"
      ],
      "dlr_values_seen": [
        ".5"
      ]
    },
    "simazine": {
      "analyte_names": [
        "SIMAZINE"
      ],
      "samples": 14,
      "systems_tested": 1,
      "first_sample": "2019-11-12",
      "last_sample": "2025-02-25",
      "detections_above_reporting_level": 0,
      "detections": [],
      "mcl_values_seen": [
        "4"
      ],
      "dlr_values_seen": [
        "1"
      ]
    },
    "2,4-D": {
      "analyte_names": [
        "2,4-D"
      ],
      "samples": 14,
      "systems_tested": 1,
      "first_sample": "2019-11-12",
      "last_sample": "2025-01-27",
      "detections_above_reporting_level": 0,
      "detections": [],
      "mcl_values_seen": [
        "70"
      ],
      "dlr_values_seen": [
        "10"
      ]
    }
  },
  "herbicides_never_tested": [
    "AMPA",
    "hexazinone",
    "imazapyr",
    "aminopyralid",
    "triclopyr",
    "clopyralid",
    "sulfometuron-methyl",
    "indaziflam",
    "oxyfluorfen",
    "diuron",
    "bromacil",
    "picloram",
    "dicamba",
    "alachlor",
    "metolachlor",
    "dalapon",
    "dinoseb",
    "pentachlorophenol",
    "bentazon",
    "molinate",
    "thiobencarb"
  ],
  "named_systems": {
    "CA3210009": {
      "label": "Chester PUD",
      "in_records": true,
      "system_name": "CHESTER PUBLIC U.D.",
      "samples": 837,
      "distinct_analytes": 139,
      "herbicides": {}
    },
    "CA3210003": {
      "label": "City of Portola",
      "in_records": true,
      "system_name": "CITY OF PORTOLA",
      "samples": 497,
      "distinct_analytes": 135,
      "herbicides": {}
    },
    "CA3210001": {
      "label": "Indian Valley CSD (Greenville)",
      "in_records": true,
      "system_name": "IVCSD-GREENVILLE",
      "samples": 343,
      "distinct_analytes": 109,
      "herbicides": {}
    },
    "CA3210004": {
      "label": "American Valley CSD (Quincy)",
      "in_records": true,
      "system_name": "AMERICAN VALLEY CSD",
      "samples": 1645,
      "distinct_analytes": 136,
      "herbicides": {}
    },
    "CA3210008": {
      "label": "East Quincy Services District",
      "in_records": true,
      "system_name": "EAST QUINCY SERVICES DISTRICT",
      "samples": 1,
      "distinct_analytes": 1,
      "herbicides": {}
    },
    "CA3210005": {
      "label": "Graeagle Water Company",
      "in_records": true,
      "system_name": "GRAEAGLE WATER COMPANY",
      "samples": 390,
      "distinct_analytes": 55,
      "herbicides": {}
    },
    "CA3210006": {
      "label": "Lake Almanor Country Club MWC",
      "in_records": true,
      "system_name": "LAKE ALMANOR COUNTRY CLUB MWC",
      "samples": 355,
      "distinct_analytes": 114,
      "herbicides": {}
    },
    "CA3210010": {
      "label": "Hamilton Branch CSD",
      "in_records": true,
      "system_name": "HAMILTON BRANCH CSD",
      "samples": 494,
      "distinct_analytes": 140,
      "herbicides": {}
    }
  }
}