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Counties → Oregon

Washington County, Oregon

SDWIS compliance plate

Sheet OR067 · Washington County 96 sys · 7,314 viol · #119/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-LOW · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 99.0% flagged
  • HEALTH-LOW 4.7% health
  • RANK-TOP #119/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-LOW 10.0% detect
  • SRC-GW GW lead 81%
  • SYS-MID 96 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Douglas County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Washington County ranks #119 of 3,254 counties by people served, and #2 of 36 counties in Oregon. See methodology · corpus placement.

Washington County standing, mid-flagged corpus third

Flagged-system rate 99.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 4.7% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 10.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #119 of 3,254 · #2 of 36 in Oregon.

Flagged-rate neighbourhood around Washington County

Lowest/highest poles plus in-state counties nearest Washington County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Polk · lowest Umatilla · near Washington · this county Wheeler · highest 86.2% 98.6% 98.7% 98.8% 99% 99% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond Oregon

Mid-flagged peers for Washington County

Cross-state counties nearest Washington County on flagged-system share (99.0%) and cumulative violation count (7,314). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

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.