County · California
Butte County, California: drinking water records
This overview covers 20 ZIP codes and 42 community water systems in Butte County. It also stands in for 3 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Thermalito Water & Sewer Dist CA0410008 | 12,136 | 256 | 1 | 1 | 0 ppb |
| City of Gridley CA0410004 | 7,269 | 300 | 6 | 1 | 0 ppb |
| Cal-Water Service Co.-Chico CA0410002 | 114,925 | 2,220 | 6 | 0 | 0 ppb |
| South Feather W&p - Miners Ranch CA0410006 | 22,664 | 120 | 0 | 0 | 5.2 ppb |
| Cal-Water Service Co.-Oroville CA0410005 | 11,106 | 180 | 1 | 0 | 0.9 ppb |
| Paradise Irrigation District CA0410007 | 9,142 | 180 | 0 | 0 | 0 ppb |
| City of Biggs CA0410001 | 2,060 | 0 | 0 | 1 | 6.9 ppb |
| Sierra Moon Mutual Water Company CA0409183 | 450 | 0 | 0 | 1 | 0 ppb |
| Pleasant Grove MHP CA0400020 | 327 | 0 | 0 | 1 | 0 ppb |
| Almond Grove Mobile Park CA0400040 | 253 | 0 | 0 | 1 | 0 ppb |
| Foothills Manufactured Home Communuty CA0400027 | 180 | 0 | 0 | 1 | 2.0 ppb |
| Forest Ranch Mutual Water System CA0400004 | 119 | 0 | 0 | 1 | 0 ppb |
| Humboldt Woodlands Mutual CA0400149 | 55 | 0 | 0 | 1 | 0 ppb |
| Meadowbrook Oaks CA0400026 | 50 | 0 | 0 | 1 | 0 ppb |
| Forest Knolls Mutual Water Co CA0400078 | 46 | 0 | 0 | 2 | 0 ppb |
| Mountain Village Homeowner'S Assoc CA0400090 | 45 | 0 | 0 | 1 | 0 ppb |
| Hartley Mutual Water System CA0400003 | 41 | 0 | 0 | 1 | 0 ppb |
| Robinson'S Corner MHP CA0400021 | 20 | 0 | 0 | 2 | 0 ppb |
| Del Oro Water Co.-Paradise Pines CA0410011 | 10,940 | 0 | 0 | 0 | 0.7 ppb |
| Durham Irrigation District CA0410003 | 1,581 | 0 | 0 | 0 | 0.7 ppb |
| Del Oro Water Co.-Lime Saddle Marina CA0405001 | 895 | 0 | 0 | 0 | 0.9 ppb |
| Del Oro Water Co.-Stirling Bluffs CA0410018 | 521 | 0 | 0 | 0 | 7.3 ppb |
| Gridley Farm Labor Housing CA0400012 | 460 | 0 | 0 | 0 | 3.4 ppb |
| Mountain Gate Estates MHP AZ0404314 | 400 | 0 | 0 | 0 | 2.2 ppb |
| Butte Creek Estates Mutual Water Co CA0400007 | 399 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Butte County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 95941, 95958, 95974.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.