PlainWater
Counties → Oregon

Umatilla County, Oregon

Water Systems
76
Population Served
71,259
Total Violations
7,500
664 health-based
PFAS Detected
4
of 4 tested

Violation Analysis

98.7%
Systems with Violations
98.7
Avg Violations per System
8.9%
Health-Based Violations

Water Source Types

GW
48 systems (63%)
SW
2 systems (3%)

PFAS Contamination

4
Systems Tested
4
PFAS Detected
100.0%
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

Umatilla 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
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 -

Other Counties in Oregon

Multnomah County
57 systems · 854,646 served · 4,422 violations
Washington County
96 systems · 597,244 served · 7,314 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

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Umatilla County? ▼
Umatilla County has 7,500 total drinking water violations across 76 water systems, of which 664 are health-based violations. 98.7% of systems have at least one violation.
How many people get water from Umatilla County systems? ▼
Water systems in Umatilla County serve approximately 71,259 people through 76 public water systems.
Has PFAS been detected in Umatilla County water? ▼
Of 4 water systems tested for PFAS in Umatilla County, 4 had PFAS detected (100.0% detection rate).
What types of water sources supply Umatilla County? ▼
Water systems in Umatilla County use GW (48 systems), SW (2 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. 8.9% of Umatilla 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.