County · Washington
Benton County, Washington: drinking water records
This overview covers 11 ZIP codes and 43 community water systems in Benton County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Kennewick City of WA5338100 | 118,164 | 240 | 6 | 0 | 0 ppb |
| Richland City of WA5372250 | 106,499 | 300 | 8 | 0 | 2.4 ppb |
| West Richland City of WA5394900 | 21,231 | 240 | 0 | 0 | 0 ppb |
| Prosser City of WA5369750 | 12,070 | 60 | 0 | 0 | 0 ppb |
| Benton City Water WA5305800 | 5,626 | 180 | 6 | 0 | 0 ppb |
| Badger Mountain Irrigation District WA5322617 | 2,331 | 0 | 0 | 7 | 2.8 ppb |
| Homestead Manufactured Housing WA5318180 | 300 | 0 | 0 | 1 | 1.6 ppb |
| Plymouth Water District WA5368045 | 288 | 0 | 0 | 5 | 0.6 ppb |
| Wilgus Housing Water System WA53AB933 | 121 | 0 | 0 | 1 | 0 ppb |
| Sundance Improvement Association WA5385209 | 100 | 0 | 0 | 13 | 4.3 ppb |
| Agrinorthwest Riverbend WA5306559 | 59 | 0 | 0 | 7 | 3.9 ppb |
| Good Neighbors Water Assn WA5376468 | 40 | 0 | 0 | 1 | 0.6 ppb |
| Mt View Tracts WA5356851 | 31 | 0 | 0 | 1 | 4 ppb |
| Summit View Water System WA5303303 | 1,869 | 0 | 0 | 0 | 0 ppb |
| Bc Water Co WA53AA373 | 1,262 | 0 | 0 | 0 | 0 ppb |
| Community Sewer and Water District WA5305966 | 1,200 | 0 | 0 | 0 | 0 ppb |
| Oasis Water Corporation WA5319069 | 556 | 0 | 0 | 0 | 0 ppb |
| Great Basin Water Kiona WA5310724 | 520 | 0 | 0 | 0 | 0 ppb |
| Canyon Village Water System INC WA5305801 | 310 | 0 | 0 | 0 | 0 ppb |
| Tri-City Water District #45 WA5389400 | 300 | 0 | 0 | 0 | 4.4 ppb |
| Metz Community & RV LLC WA5354380 | 245 | 0 | 0 | 0 | 0.6 ppb |
| Red Mountain Water Association WA5306091 | 200 | 0 | 0 | 0 | 0 ppb |
| Southgate Water Company WA5356344 | 175 | 0 | 0 | 0 | 0 ppb |
| Wyckoff Farms WA5398673 | 131 | 0 | 0 | 0 | 0 ppb |
| Kiona Village Court WA5342175 | 124 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Benton County
No ZIP report in this county is published yet.
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.