PlainWater
Counties → Washington

Spokane County, Washington

SDWIS compliance plate

Sheet WA063 · Spokane County 164 sys · 9,829 viol · #113/3254

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

  • VIOL-SEVERE 96.3% flagged
  • HEALTH-LOW 5.4% health
  • RANK-TOP #113/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-MID 45.8% detect
  • SRC-GW GW lead 99%
  • SYS-LARGE 164 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Pierce County ( -0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Spokane County ranks #113 of 3,254 counties by people served, and #4 of 39 counties in Washington. See methodology · corpus placement.

Spokane County standing, mid-flagged corpus third

Flagged-system rate 96.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 5.4% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 45.8% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #113 of 3,254 · #4 of 39 in Washington.

Flagged-rate neighbourhood around Spokane County

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

0% 20% 40% 60% 80% 100% Grant · lowest Pierce · near King · near Wahkiakum · highest 69.8% 95.1% 96.1% 96.3% 96.8% 97.1% 100%

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

Water Systems

System Name Population Violations PFAS
Spokane City Of 343,167 1 Detected
Whitworth Water District 2 26,883 434 Detected
Vera Water & Power 24,692 66 Clean
Consolidated Irrig Dist 19 System 2 21,220 44 Clean
Spo Co Water Dist 3 Sys 1 18,983 124 Clean
Modern Electric Water Co 18,487 262 Clean
Eastern Washington University 17,108 39 Clean
Cheney City Of 14,621 17 Clean
Liberty Lake Sewer & Water District 14,212 27 Detected
Airway Heights City Of 9,489 194 Detected
Consolidated Irrig Dist 19 System 1 9,434 22 Clean
Model Irrigation Dist #18 7,903 204 Detected
Pasadena Park Irr Dist 17 6,269 298 Clean
Spo Co Water Dist 3 Sys 4 6,155 332 Clean
Fairchild Air Force Base 5,553 10 Detected
Deer Park City Of 5,045 69 Detected
Spokane Business & Industrial Park 5,000 25 Clean
Medical Lake City Of 4,982 11 Detected
Orchard Avenue Irrigation Dist 6 4,330 24 Clean
East Spokane Water Dist 1 4,285 53 Detected
Trentwood Irrigation District 3 4,228 45 Detected
Irvin Water District #6 4,150 11 Detected
Spo Co Water Dist 3 Sys 3 3,765 271 Clean
Providence SHMC 2,838 0 -
Hutchinson Irrigation Dist #16 2,826 25 -
North Spokane Irrigation District 8 2,214 73 -
Carnhope Irrigation District 7 2,104 7 -
Millwood City Of 1,925 18 -
Moab Irrigation Dist #20 1,790 30 -
Riverside SD Central Site Schools 1,320 225 -
Mount Spokane Ski #2 1,301 9 -
Whitworth University 1,200 151 -
Kaiser Alum - Trentwood Works 954 12 -
Freeman School Dist #358 900 163 -
Hangman Hills Water Dist 15 827 24 -
WSDP Mt Spokane St Park #3 679 18 -
WSDP Riverside SP ORV Area 651 5 -
Fairfield Town Of 643 166 -
Clear Lake Rec Area 637 7 -
Ridge Water Association 615 11 -
Rockford Town Of 570 79 -
Consolidated Support Services 569 64 Clean
Stevens Co PUD - Spokane Lake Park 532 9 -
Stevens Co PUD - West Shore 505 20 -
Liberty School District #362 486 27 -
Spo Co Water Dist 3 Sys 5 485 2 -
Pioneer Water Company 443 46 -
Four Lakes Water District 10 433 22 -
Wsdp Mt Spokane State Park #6 403 29 -
Upper Columbia Academy 380 54 -

Compare beyond Washington

Mid-flagged peers for Spokane County

Cross-state counties nearest Spokane County on flagged-system share (96.3%) and cumulative violation count (9,829). 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.