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Counties → Washington

Yakima County, Washington

SDWIS compliance plate

Sheet WA077 · Yakima County 220 sys · 12,104 viol · #261/3254

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

  • VIOL-SEVERE 86.4% flagged
  • HEALTH-LOW 5.4% health
  • RANK-TOP #261/3254
  • PHOTO-FINISH ±0.4 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 99%
  • SYS-LARGE 220 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Stevens County (+ 0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Yakima County ranks #261 of 3,254 counties by people served, and #9 of 39 counties in Washington. See methodology · corpus placement.

Yakima County standing, lower-flagged corpus third

Flagged-system rate 86.4% is at or below the corpus lower third (≤ 92.7% 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 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #261 of 3,254 · #9 of 39 in Washington.

Flagged-rate neighbourhood around Yakima County

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

0% 20% 40% 60% 80% 100% Grant · lowest Yakima · this county Garfield · near Wahkiakum · highest 69.8% 83.3% 86.4% 86.8% 88.9% 89.4% 100%

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

Water Systems

System Name Population Violations PFAS
Yakima Water Division City Of 112,858 57 Clean
Nob Hill Water Association 36,026 29 Clean
Sunnyside City Of 17,037 45 Clean
Selah City Of 12,515 243 Clean
Grandview City Of 11,010 346 Clean
Toppenish Water Department 8,950 8 Clean
Yak Co - Terrace Heights 8,410 174 Clean
Union Gap Water 6,433 26 Clean
Moxee Water Department 5,599 89 Clean
Wapato Waterworks 5,255 146 Clean
Granger Water Department 3,993 14 Clean
Zillah City Of 3,518 55 -
Naches Town Of 3,512 517 Clean
Mabton City Of 2,150 172 -
Tieton Water Dept City Of 1,475 66 -
Harrah Water System 1,304 27 -
Harrison Well #2 1,200 52 -
Washington Beef LLC 1,025 0 -
Allan Bros Warehouse 1,000 125 -
Wiley City Fairgrounds 1,000 0 -
Selah Cr Sb Rest Area 1,000 20 -
Yak Co - Buena Water System 952 5 -
Highland Quick Stop 801 15 -
Heritage University Water System 750 56 -
Memorial Bible Church 736 23 -
Selah Cr Nb Rest Area 685 12 -
Outlook Elementary School 600 232 -
Highland High School 500 21 -
Pomona View Mobile Park 470 34 -
Marcus Whitman School 370 13 -
Sun Tides Vista Homeowners Assn 350 6 -
Skyline Mobile Home Park 340 19 -
McDonald Well 307 5 -
Sunnyview Park 300 8 -
Selah Hills Homeowners Cooperative 300 19 -
Outlook Community Water 282 111 -
Marys Garden 280 16 -
Yakima Training Center - Pomona 280 65 -
Mountainview Elementary School 220 59 -
Panorama Place Water Assn 220 80 -
Sundquist Sunnyslope Domestic 196 3 -
Yak Co - Crewport 192 114 -
Sundquist TWH-Terrace Heights 192 3 -
Richardson Water Company 188 43 -
Bonair Winery 181 0 -
Country Mobile Estates 180 40 -
Lombard Loop Water Association 180 202 -
Cowiche Growers Inc 177 145 -
Willow Tree Park 176 94 -
Borton & Sons Inc 159 39 -

Compare beyond Washington

Lower-flagged peers for Yakima County

Cross-state counties nearest Yakima County on flagged-system share (86.4%) and cumulative violation count (12,104). 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.