Tapcensus

Washington

Benton County drinking water quality

115 active public water systems serve 289,544 people in Benton County. 60 are compliant, 55 had at least one EPA violation in the past three years, 4 are designated serious violators, and 2 carry a health flag.

Active systems 115 44 community systems
People served 290K by public water systems
Systems with violations 55 48% of active systems, past 3 years
Serious violators 4 2 systems carry a health flag

Needs attention

Columbia Generating Station WA5392024 · Non-Transient non-community system · Serves 1,302 1 rule violated in the past three years. Unresolved: Surface Water Treatment Rule.
MC Corkles Market WA5396570 · Transient non-community system · Serves 106 1 rule violated in the past three years
Eddie Farms Dairy Site WA53AD658 · Transient non-community system · Serves 96 1 rule violated in the past three years
Industrial Development Complex WA5392023 · Non-Transient non-community system · Serves 52 1 rule violated in the past three years. Unresolved: Surface Water Treatment Rule.

Community water systems

44 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Kennewick City of
 118,164 0 0
Richland City of
 106,499 0 0
West Richland City of
 21,231 0 0
Prosser City of
 8,030 1 0
Benton City Water
 5,626 0 0
Badger Mountain Irrigation District
 2,331 2 0
Summit View Water System
 1,869 1 1
BC Water CO
 1,262 0 0
Community Sewer and Water District
 1,200 1 0
Oasis Water Corporation
 556 0 0
Great Basin Water Kiona
 520 1 0
Canyon Village Water System INC
 310 0 0
Homestead Manufactured Housing
 300 2 0
Tri-City Water District #45
 300 0 0
Plymouth Water District
 288 2 0
Metz Community & RV LLC
 245 2 0
Red Mountain Water Association
 200 5 0
Southgate Water Company
 175 2 0
Wyckoff Farms
 131 1 0
Columbia Place LLC
 125 3 0
Kiona Village Court
 124 0 0
Wilgus Housing Water System
 121 3 0
Rainbow Court
 120 1 0
Hillview Mobile Community LLC
 118 0 0
Roza Heights Water Assn
 110 1 0
Conagra Foods Lamb Weston Inc-Farm
 107 0 0
Great Basin Water Sunrise
 100 2 0
Sundance Improvement Association
 100 2 0
River Ridge Farmworker Housing
 98 0 0
Gmp Orchards LLC Harbo
 96 0 0
Paterson Heights Water Assn
 85 0 0
Kiona West Heights Water Assoc.
 77 0 0
Badger Canyon Ranchettes #2
 70 0 0
Eaton Park Subdivision
 70 0 0
Whitstran Heights Water Association
 65 2 0
Agrinorthwest Riverbend
 59 2 0
Goodnight Water System
 47 0 0
Badger Canyon Water Assn
 40 1 0
Good Neighbors Water Assn
 40 1 0
Mount Adams Vista Water System
 34 0 0
Bar 80 Ranchettes
 32 0 0
MT View Tracts
 31 0 0
Coxville Water Assn #1
 26 0 0
Goose Gap Water Association
 25 0 0
Non-community systems (71: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Energy Dept Of/200w
 6,351 0 0
Columbia Generating Station
 1,302 1 1
Finley School District #53
 990 4 0
General Store
 939 0 0
Vernita Rest Area 1
 639 0 0
Energy Dept Of/300 Area
 600 0 0
Benton County Two Rivers Park
 474 1 0
Finley Elementary School (new)
 450 3 0
Zirkle Paterson Ranch
 374 0 0
Lineage Logistics
 290 0 0
Whitstran Elementary School
 280 1 0
Lamb Weston Paterson
 250 0 0
Plymouth Day Use
 242 0 0
Energy Dept Of/100k
 235 0 0
Wsu Iarec Prosser
 224 1 0
Smwe Columbia Crest Winery
 218 1 0
Bookwalter Winery
 207 1 0
Welchs
 180 0 0
Hartley Brent
 143 0 0
Munn Robert Well
 143 0 0
Paterson Elementary School
 142 0 0
Crow Butte Park
 141 1 0
Zirkle Four Feathers Ranch
 133 1 0
Finley Shopper the
 125 1 0
Zirkle Fruit Paterson Ranch
 112 1 0
MC Corkles Market
 106 1 0
Plymouth Campground
 104 1 0
Hinzerling H2a
 100 0 0
Plymouth Ranch
 100 0 0
Sportfisher Housing
 100 0 0
Boast West Farmworker Housing
 99 1 0
Missimer H2a Housing
 98 1 0
A&b Farmworker Housing
 96 1 0
Benton Snipes
 96 0 0
Boast East Farmworker Housing
 96 0 0
Eddie Farms Dairy Site
 96 1 0
May Nursery Twh
 96 1 0
Olsen Road North Fwh
 96 0 0
Olsen Road South Fwh
 96 0 0
Stokely #1 Evans Rd Fwh
 96 0 0
Zirkle McNary Ranch #2
 96 1 0
Zirkle Finley Ranch
 96 1 0
Zirkle Gap Road Ranch
 96 0 0
Zirkle Gap Ranch #2
 96 0 0
Zirkle-Finley Ranch H2a Housing #2
 96 1 0
Elm Grove RV Park
 82 0 0
Nutrien US LLC Kennewick Area
 80 0 0
Bybee Clyde W.
 76 1 0
Wyckoff Farms Sunny Hop
 71 1 0
Hedges Cellars
 60 1 0
Shuler Housing Water System
 60 1 0
Ligo Water System
 57 1 0
Williams Compound Water System
 57 0 0
Chinook Wines
 54 0 0
Tcalc
 54 0 0
Col Solare Winery
 53 0 0
Industrial Development Complex
 52 1 1
Greenbrier Rail Services
 45 0 0
Smwe Canoe Ridge Winery
 45 0 0
Fidelitas Winery
 44 1 0
North Prosser Market
 43 1 0
Big Toe Salvage
 42 2 0
Smwe Vineyard 8
 41 1 0
Annas Mini Mart
 40 0 0
Desert House Cafe & Grocery
 35 0 0
Vbc
 32 0 0
Barnard Griffin Winery
 28 1 0
Horse Heaven Hills Mobile Home Park
 27 0 0
Energy Dept Of/400 Area
 25 0 0
Wheat Head Brewery
 25 0 0
Horn Rapids Park Water System
 20 1 0
Inactive systems (134, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.