PlainWater
Counties → Washington

Grant County, Washington

Water Systems
268
Population Served
145,560
Total Violations
12,635
1,011 health-based
PFAS Detected
4
of 5 tested

Violation Analysis

69.8%
Systems with Violations
47.1
Avg Violations per System
8.0%
Health-Based Violations

Water Source Types

GW
50 systems (19%)

PFAS Contamination

5
Systems Tested
4
PFAS Detected
80.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Grant Washington water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Moses Lake City Of 32,428 626 Detected
Gorge Amphitheatre 25,015 29 -
Ephrata Water Department 8,620 267 Clean
Quincy Water Department City Of 8,415 281 Clean
Mattawa City of 5,015 227 Clean
Sun Lakes State Park 4,858 17 -
Warden City Of 4,674 219 Clean
Royal City Water 3,389 61 -
Steamboat Rock State Park #1 2,907 6 -
Desert Aire Owner Assn 2,856 518 -
Soap Lake Water Dept 2,399 25 -
Concert Camping Inc 2,040 6 -
Electric City City Of 1,812 36 -
Sunland Estates Homeowners Assn 1,480 84 -
Potholes State Park 1,456 13 -
Grand Coulee Water Dept City Of 1,428 11 -
Pelican Point By Cascadia LLC 1,357 140 -
Lakeview Park Water Assn 1,259 83 -
Weiler-Martin Tracts Water Assn 1,163 79 -
Basin Water Sources Inc 1,158 32 -
Crescent Bar System 1,108 43 -
George City Of 1,035 74 -
Sunserra at Crescent Bar 1,000 161 -
Coulee City Town Of 944 27 -
Winchester Wb Rest Area 944 11 -
Winchester Eb Rest Area 903 11 -
Potholes General Store 877 25 -
Ephrata Raceway Park 700 28 -
Quincy Valley Rest Area 536 10 -
Dry Falls State Park 519 10 -
Port of Royal Slope 447 76 -
Royal Water District 430 75 -
Wilson Creek Water Dept Town Of 386 35 -
Cascade Valley Water District 379 477 -
JR Simplot Co 365 59 -
Smokiam RV Resort 343 26 -
Deep Lake State Park 323 8 -
Stratford Road Estates 312 186 -
Green Acres Orchard 308 0 -
Wanapum Village 305 164 -
Hillcrest Water Users Assn 300 56 -
Midway Mini-Mart 293 18 -
Skyline Water System Inc 293 44 -
Green Acres - Mattawa 271 18 -
Parker Spring Acres Water Assoc 255 26 -
Sunrise Water Association 250 44 -
Hartline Water System 249 69 -
Crescent View Condominium Owners 243 34 -
Ridgeview Estates Water Association 240 9 -
Sentinel Gap Water Assn 226 59 -

Other Counties in Washington

King County
217 systems · 3,193,095 served · 20,636 violations
Pierce County
359 systems · 1,138,508 served · 14,826 violations
Snohomish County
170 systems · 947,238 served · 8,193 violations
Spokane County
164 systems · 621,798 served · 9,829 violations
Clark County
72 systems · 615,931 served · 9,864 violations
Thurston County
322 systems · 395,780 served · 24,330 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Grant County? ▼
Grant County has 12,635 total drinking water violations across 268 water systems, of which 1,011 are health-based violations. 69.8% of systems have at least one violation.
How many people get water from Grant County systems? ▼
Water systems in Grant County serve approximately 145,560 people through 268 public water systems.
Has PFAS been detected in Grant County water? ▼
Of 5 water systems tested for PFAS in Grant County, 4 had PFAS detected (80.0% detection rate).
What types of water sources supply Grant County? ▼
Water systems in Grant County use GW (50 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 8.0% of Grant County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.