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Counties → Oregon

Umatilla County, Oregon

SDWIS compliance plate

Sheet OR059 · Umatilla County 76 sys · 7,500 viol · #729/3254

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

  • VIOL-SEVERE 98.7% flagged
  • HEALTH-LOW 8.9% health
  • RANK-UPPER #729/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 75.0% detect
  • SRC-GW GW lead 97%
  • SYS-MID 76 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Umatilla County ranks #729 of 3,254 counties by people served, and #12 of 36 counties in Oregon. See methodology · corpus placement.

Umatilla County standing, mid-flagged corpus third

Flagged-system rate 98.7% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 8.9% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 75.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #729 of 3,254 · #12 of 36 in Oregon.

Flagged-rate neighbourhood around Umatilla County

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

0% 20% 40% 60% 80% 100% Polk · lowest Umatilla · this county Washington · near 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
Hermiston, City Of 20,000 168 Detected
Pendleton, City Of 16,996 69 Detected
Umatilla, City Of 8,256 114 Clean
Milton-Freewater, City Of 7,145 290 Detected
Stanfield, City Of 2,115 250 -
Pilot Rock, City Of 1,326 73 -
Athena, City Of 1,238 46 -
Space Age Fuel 975 107 -
Super 7 Mini-Mart 900 0 -
Hermiston Fuel & Go 800 55 -
Weston, City Of 714 21 -
Echo, City Of 632 20 -
First Stop Mart 550 18 -
Oprd Hat Rock State Park 500 65 -
Ote Deadmans Pass Rest Area 500 31 -
Lamb Weston 500 33 -
Tierra Linda Estates 450 171 -
Ote Stanfield Rest Area 450 23 -
Adams Water Dept, City Of 400 27 -
Vista Home Park 300 64 -
One Stop Mart #27 300 15 -
Lakeside Foods 250 137 -
Ferndale Elementary 250 321 -
Wayside Market 250 89 -
Amazon Data Hermiston Pdx080 250 9 -
Amazon Data Umatilla Pdx063 250 5 -
Charles Tracts Water Company 249 371 -
Ukiah, City Of 235 178 -
Green Acres MHP - Umatilla Co 200 178 -
Sunridge Water Inc 200 126 -
Oprd Emigrant Springs State Pk 200 22 -
Short Stop #1 200 49 -
Helix, City Of 190 96 -
Union Pacific Rr-Hinkle Yard 180 227 -
Rieth Water District 150 55 -
Country Squire Estates 150 10 -
One Stop Mart #18 150 17 -
Jj Snack Food Handheld 150 11 -
Heritage Improvement District 125 133 -
Chart Subdivision 125 302 -
Coe McNary Dam 120 463 -
Villadom Mobile Home Park 115 137 -
Shady Rest Mobile Court 110 86 -
Hat Rock Water Company 108 170 -
North Hill Water Corporation 100 231 -
Ups-Hermiston 100 79 -
Clay in Motion 100 20 -
Tollgate Crossing 100 144 -
Punkin Center School 100 351 -
Milton-Stateline SDA School 100 119 -

Compare beyond Oregon

Mid-flagged peers for Umatilla County

Cross-state counties nearest Umatilla County on flagged-system share (98.7%) and cumulative violation count (7,500). 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.