County · Washington
Benton County, Washington: drinking water records
Explore EPA records for 44 community water systems across 11 ZIP codes in Benton County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 5 of the 44 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
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 in this county
All 44 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| 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 ppbbelow the action level |
| Richland City of WA5372250 | 106,499 | 300 | 8 | 0 | 2.4 ppbbelow the action level |
| West Richland City of WA5394900 | 21,231 | 240 | 0 | 0 | 0 ppbbelow the action level |
| Prosser City of WA5369750 | 12,070 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Benton City Water WA5305800 | 5,626 | 180 | 6 | 0 | 0 ppbbelow the action level |
| Badger Mountain Irrigation District WA5322617 | 2,331 | 0 | 0 | 7 | 2.8 ppbbelow the action level |
| Homestead Manufactured Housing WA5318180 | 300 | 0 | 0 | 1 | 1.6 ppbbelow the action level |
| Plymouth Water District WA5368045 | 288 | 0 | 0 | 5 | 0.6 ppbbelow the action level |
| Wilgus Housing Water System WA53AB933 | 121 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Sundance Improvement Association WA5385209 | 100 | 0 | 0 | 13 | 4.3 ppbbelow the action level |
| Agrinorthwest Riverbend WA5306559 | 59 | 0 | 0 | 7 | 3.9 ppbbelow the action level |
| Good Neighbors Water Assn WA5376468 | 40 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Mt View Tracts WA5356851 | 31 | 0 | 0 | 1 | 4 ppbbelow the action level |
| Summit View Water System WA5303303 | 1,869 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bc Water Co WA53AA373 | 1,262 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Community Sewer and Water District WA5305966 | 1,200 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Oasis Water Corporation WA5319069 | 556 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Great Basin Water Kiona WA5310724 | 520 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Canyon Village Water System INC WA5305801 | 310 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Tri-City Water District #45 WA5389400 | 300 | 0 | 0 | 0 | 4.4 ppbbelow the action level |
| Metz Community & RV LLC WA5354380 | 245 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Red Mountain Water Association WA5306091 | 200 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Southgate Water Company WA5356344 | 175 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wyckoff Farms WA5398673 | 131 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Columbia Place LLC WA5353263 | 125 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kiona Village Court WA5342175 | 124 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rainbow Court WA5370770 | 120 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hillview Mobile Community LLC WA5333366 | 118 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Roza Heights Water Assn WA5374800 | 110 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Conagra Foods Lamb Weston Inc-Farm WA5363913 | 107 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Great Basin Water Sunrise WA5385630 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| River Ridge Farmworker Housing WA53AD621 | 98 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Paterson Heights Water Assn WA5366479 | 85 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kiona West Heights Water Assoc. WA5316589 | 77 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Badger Canyon Ranchettes #2 WA5332074 | 70 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Eaton Park Subdivision WA5322285 | 70 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Whitstran Heights Water Association WA5396550 | 65 | 0 | 0 | 0 | 4.5 ppbbelow the action level |
| Goodnight Water System WA5303414 | 47 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Badger Canyon Water Assn WA5300604 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mount Adams Vista Water System WA5341140 | 34 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Bar 80 Ranchettes WA5332071 | 32 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Coxville Water Assn #1 WA5302777 | 26 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Goose Gap Water Association WA5303404 | 25 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Gmp Orchards LLC - Harbo WA53AD606 | 96 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Benton County, Washington. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Benton County
11ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Finley
- Kennewick
- Prosser
- Richland
- Sunnyside
- West Richland
View ZIP areas and understand coverage
- 98944Sunnyside
- 99320West Richland
- 99336Kennewick
- 99337Finley
- 99338Kennewick
- 99345
- 99346
- 99350Prosser
- 99352Richland
- 99353West Richland
- 99354Richland
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
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. Database prepared 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.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.