PlainWater
Counties → Oregon

Washington County, Oregon

Water Systems
96
Population Served
597,244
Total Violations
7,314
347 health-based
PFAS Detected
1
of 10 tested

Violation Analysis

99.0%
Systems with Violations
76.2
Avg Violations per System
4.7%
Health-Based Violations

Water Source Types

GW
33 systems (34%)
SW
17 systems (18%)

PFAS Contamination

10
Systems Tested
1
PFAS Detected
10.0%
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

Washington Oregon 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
Tualatin Valley Water District 224,600 17 Clean
Hillsboro, City Of 92,632 9 Clean
Beaverton, City Of 88,045 21 Clean
Tigard, City Of 62,500 14 Clean
Tualatin, City Of 28,106 11 Clean
Forest Grove, City Of 26,838 45 Clean
Sherwood, City Of 19,885 40 Detected
Cornelius, City Of 14,490 42 Clean
West Slope Water District 11,000 32 Clean
Raleigh Water District 4,500 29 Clean
North Plains Water Department 3,663 38 -
La Water Co-Op 2,500 39 -
Banks Water Department 2,070 230 -
Hillsboro-Cherry Grove 1,628 57 -
Oprd Ll Stub Stewart St Pk 1,206 14 -
Als Garden Centers & Greenhouses 874 0 -
Washington Co Pks - Hagg Lake 800 174 -
Gaston, City Of 625 46 -
Gales Creek Shell & Grocery 600 14 -
Meriwether Natl Golf Course 516 59 -
North Plains Arco 500 52 -
Fir Grove Homeowners Assn 450 36 -
Visitation Church and School 450 64 -
Vadis Camp 425 19 -
Star Satellite Improv Dist 400 28 -
Gales Creek Camp 360 47 -
West Union Elem SD 1 350 123 -
Farmington View Elem SD 1J 340 28 -
Camp Mountaindale 300 22 -
Tualatin Valley Regional Trng Ctr 300 16 -
Reserve Vineyards & Golf Club 300 226 -
Usfws Tualatin River Natl Wlr 275 18 -
Westview Mobile Estates 250 342 -
South Hills Water System 250 17 -
Groner Elementary SD 1J 250 150 -
Helvetia Tavern Inc 250 19 -
Manning Dairy Queen 250 11 -
Snack Jacks Water System 250 62 -
Laurelwood Water Users 200 213 -
McMenamins Rock Creek Tavern 200 28 -
St Francis of Assisi School 200 199 -
Sun Outdoors Portland South 190 90 -
Timber Water Association 180 454 -
Forest Hills Golf Course 180 16 -
Parrett Mountain View Estates 155 199 -
Timberline Baptist Church 150 661 -
Midway Firehouse Pizza 137 49 -
Laurel Community Church 110 32 -
Cold Springs Water Co 100 355 -
Glenwoods Food Mart 100 221 -

Other Counties in Oregon

Multnomah County
57 systems · 854,646 served · 4,422 violations
Clackamas County
231 systems · 385,530 served · 18,114 violations
Marion County
196 systems · 370,079 served · 19,281 violations
Lane County
237 systems · 327,688 served · 16,216 violations
Deschutes County
138 systems · 204,759 served · 5,986 violations
Jackson County
208 systems · 197,238 served · 12,362 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Washington County? ▼
Washington County has 7,314 total drinking water violations across 96 water systems, of which 347 are health-based violations. 99.0% of systems have at least one violation.
How many people get water from Washington County systems? ▼
Water systems in Washington County serve approximately 597,244 people through 96 public water systems.
Has PFAS been detected in Washington County water? ▼
Of 10 water systems tested for PFAS in Washington County, 1 had PFAS detected (10.0% detection rate).
What types of water sources supply Washington County? ▼
Water systems in Washington County use GW (33 systems), SW (17 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. 4.7% of Washington 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.