Tapcensus

Water quality in Mattawa, Washington

Mattawa is in Grant County. 267 active public water systems serve the county; 87 had an EPA violation in the past three years.

Most likely your provider

Mattawa City of WA5352000 · Community water system · Ground water
Serves 5,370 people Rules violated, past 3 years 2 Last sanitary survey Sep 1, 2022 Distance 0.3 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in Grant County

80 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Desert Aire Owner Assn
 2,856 0 3.7 mi
Sentinel Gap Water Assn
 226 2 6.0 mi
Beverly Water District
 120 2 6.9 mi
Wanapum Village
 305 1 10.2 mi
Royal City Water
 3,389 1 17.6 mi
Royal Water District
 430 1 23.4 mi
Sunland Estates Homeowners Assn
 1,480 1 24.1 mi
George City of
 1,035 2 24.2 mi
The Village at Colockum Ridge
 144 1 29.1 mi
Sun Desert INC
 27 2 30.3 mi
Sunrise Water Association
 250 1 30.7 mi
Marine View Home Owners Assn
 87 1 31.0 mi
Desert Hills
 30 0 31.1 mi
Crescent Bar System
 1,108 0 32.7 mi
Weiler-Martin Tracts Water Assn
 1,163 2 34.1 mi
Sunserra at Crescent Bar
 1,000 2 34.4 mi
Quincy Water Department City of
 8,415 1 34.6 mi
Golden Valley Water Assn
 138 1 35.9 mi
Crescent View Condominium Owners
 243 1 36.0 mi
First Potholes Water Users Assn
 90 2 36.4 mi
Silver Sands Condo Water
 37 0 36.6 mi
Country Club Estates Water System
 186 0 36.6 mi
Pelican Point by Cascadia LLC
 1,357 1 37.2 mi
Sage Hills Second Water System
 34 2 37.8 mi
Legacy Resort
 46 2 37.9 mi
All 81 community water systems in Grant County
Non-community systems in Grant County (186: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Port of Mattawa Ind Parks 2 & 4
 110 2 0
Mac Thom Orchards
 84 0 0
Soaring Eagle #6
 81 0 0
Skyline South Fwh
 51 0 0
Desert Sands II Fwh
 100 0 0
Randy Allred Orchards
 43 0 0
Cimmaron Farmworker Housing
 46 0 0
Grant Rd 25
 96 0 0
Green Acres Mattawa
 267 0 0
Tnt Farmworker Housing
 45 0 0
Sam Farmworker Housing
 100 0 0
White Sands Fwh
 107 0 0
Wahluke Meeting House
 72 1 0
Capstone Farmworker Housing
 96 1 0
Matson Mattawa Campus
 48 1 0
Wanapum Maintenance Center
 70 0 0
Zirkle Wahluke Ranch
 96 0 0
Zirkle Mattawa Ranch
 99 0 0
Zirkle-Chief Mattawa Ranch
 25 0 0
Yanoff Ranch
 82 0 0
Zirkle Yanoff Ranch #2
 96 0 0
Eilers Housing
 48 0 0
King Fuji Ranch Housing
 71 0 0
Royal Bluff Rco Fwh
 64 0 0
King Fuji Ranch Housing No. 2
 96 0 0
Road O Camp Housing
 99 0 0
Royal Pacific Orchard
 84 0 0
Monson Fruit Rd 9 H2a Housing
 96 1 0
Lynx H2a Housing
 100 0 0
Zirkle Royal Slope Ranch #2
 96 0 0
Fox Orchard Farmworker Housing
 100 0 0
Port of Royal Slope
 447 0 0
Royal Bluffs Ranch
 11 0 0
Frenchman Orchard Farmworker
 72 0 0
Frog Ranch Farmworker Housing
 100 0 0
AC Management Fwh
 86 0 0
High Line Housing
 96 0 0
Valley Fruit Orchards LLC
 72 0 0
Jackrabbit South
 54 0 0
Chukar Farmworker Housing
 100 0 0
Grouse Farmworker Housing
 100 0 0
Rexius Farms Housing U104 B86
 32 0 0
Valley Fruit Hilltop
 108 2 0
R-12 Temporary Worker Housing
 51 0 0
Kds Orchards Farmworker Housing
 64 1 0
Jack Rabbit Water System
 98 1 0
Apple Farmer Farmworker Housing
 46 0 0
Lawrence U107 Farmworker Housing
 50 0 0
Frenchman Hills Dodson
 99 1 0
Randy Allred Employee Housing
 98 0 0
All non-community systems
About this data

Water systems are matched to Grant County, nearest to Mattawa first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.

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.