Tapcensus

Oregon

Umatilla County drinking water quality

77 active public water systems serve 71,867 people in Umatilla County. 9 are compliant, 68 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 1 carries a health flag.

Active systems 77 34 community systems
People served 72K by public water systems
Systems with violations 68 88% of active systems, past 3 years
Serious violators 1 1 systems carry a health flag

Needs attention

Columbia Basin Onion OR4195757 · Non-Transient non-community system · Serves 97 5 rules violated in the past three years. Unresolved: E. coli (Escherichia coli), Public Notification Rule, and Revised Total Coliform Rule (RTCR).
Stewarts Addition OR4100619 · Community water system · Serves 50 5 rules violated in the past three years. Unresolved: Consumer Confidence Rule (CCR), E. coli (Escherichia coli), Lead and Copper Rule (LCR), and Revised Total Coliform Rule (RTCR).

Community water systems

34 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Hermiston, City of
 20,000 2 0
Pendleton, City of
 16,996 2 0
Umatilla, City of
 8,256 3 0
Milton-Freewater, City of
 7,145 1 0
Stanfield, City of
 2,115 2 0
Pilot Rock, City of
 1,326 2 0
Athena, City of
 1,238 1 1
Weston, City of
 714 2 0
Echo, City of
 632 1 0
Tierra Linda Estates
 450 5 0
Adams Water Dept, City of
 400 1 0
Vista Home Park
 300 2 0
Charles Tracts Water Company
 290 4 0
Ukiah, City of
 235 1 0
Green Acres MHP Umatilla CO
 200 3 2
Sunridge Water INC
 200 6 0
Helix, City of
 190 4 1
Country Squire Estates
 150 2 2
Hat Rock Water Company
 150 2 0
Rieth Water District
 150 1 0
Chart Subdivision
 125 2 0
Heritage Improvement District
 125 0 0
Villadom Mobile Home Park
 115 7 0
Shady Rest Mobile Court
 110 2 0
North Hill Water Corporation
 100 4 1
Vincent Water Company
 90 2 0
Stanfield Hutterian
 80 3 1
Green Meadows Wtr Corporation
 75 3 0
McKay Acres Improvement Dist
 75 4 0
Power City Water Co-Op
 70 5 0
Halls Trailer Court
 60 2 0
Hat Rock Mobile Court
 60 2 2
Stewarts Addition
 50 5 2
Desire for Healing, INC
 33 5 0
Non-community systems (43: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Space Age Fuel
 975 1 0
Super 7 Mini-Mart
 900 1 0
Hermiston Fuel & GO
 800 1 1
Short Stop #1
 650 3 1
First Stop Mart
 550 1 1
Lamb Weston
 500 3 1
Oprd Hat Rock State Park
 500 2 0
Ote Deadmans Pass Rest Area
 500 1 0
Ote Stanfield Rest Area
 450 0 0
One Stop Mart #27
 300 1 0
Amazon Data Hermiston Pdx080
 250 2 0
Amazon Data Umatilla Pdx063
 250 2 1
Ferndale Elementary
 250 1 0
Lakeside Foods
 250 0 0
Wayside Market
 250 1 0
Oprd Emigrant Springs State PK
 200 2 0
Union Pacific Rr-Hinkle Yard
 180 0 0
JJ Snack Food Handheld
 150 2 0
One Stop Mart #18
 150 1 0
Usace McNary Dam
 120 2 0
Clay in Motion
 100 1 0
Comfort Inn & Suites-Hermiston
 100 3 0
Milton-Stateline Sda School
 100 2 0
Punkin Center School
 100 1 0
Tollgate Crossing
 100 2 0
Ups-Hermiston
 100 2 1
Columbia Basin Onion
 97 5 2
Fed EX Hermiston
 80 1 0
Rogers Toyota
 75 0 0
Panelview RV Park
 60 0 0
River Point Farms Packing
 60 2 0
Alive and Well
 50 1 0
Kellys
 50 0 0
M-F Drive in Theatre
 50 0 0
Hermiston Adventist School
 40 3 1
Pierre Ford Hermiston
 40 1 0
Project Path Water System
 30 3 0
Usda AG Research Station
 30 2 1
Birch Creek Golf Course
 25 2 0
Fewel Farms
 25 2 0
Langdon Lake Water Cooperative
 25 1 1
Oregon Trail Cafe
 25 3 1
Umatilla CO Pks Harris Park
 25 0 0
Inactive systems (99, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Oregon records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.