States › Oregon › Umatilla County

Umatilla County, OR Water Quality

Water quality data for 17 public water systems serving Umatilla County, Oregon — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 17 water systems · 18 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Umatilla County Earns a A

Umatilla County: 18 communities across 17 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 10 communities with a lead detection, 8 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
17
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Pendleton
    2.50 ppb
    No federal limits exceeded on record
    A
  • Umatilla
    Not detected
    No federal limits exceeded on record
    A
  • Stanfield
    2.00 ppb
    No federal limits exceeded on record
    B
  • Pilot Rock
    Not detected
    No federal limits exceeded on record
    B
  • Weston
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Hermiston
    3.00 ppb
    PFAS above the limit at 2 of 4 sampling points
    C
  • Mission
    Not detected
    5 significant inspection deficiencies
    C
  • Milton-Freewater
    2.00 ppb
    PFAS above the limit at 1 of 3 sampling points
    B
  • Helix
    Not detected
    4 health-based violations since 2015
    B
  • Athena
    1.76 ppb
    2 health-based violations since 2015
    B
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
10
No Data
8

All Cities in Umatilla County

Hermiston 3.00 ppb C
Pendleton 2.50 ppb A
Milton-Freewater 2.00 ppb B
Umatilla Not detected A
Stanfield 2.00 ppb B
Pilot Rock Not detected B
Athena 1.76 ppb B
Weston Not detected B
Echo Not detected B
Mission Not detected C
Adams 2.00 ppb B
Green Meadows 1.00 ppb B
Riverside 2.50 ppb A
Helix Not detected B
Ukiah Not detected B
Umapine 1.70 ppb B
Gopher Flats 4.00 ppb B
Tutuilla Not detected B
Showing 18 cities
No active violations Active violations

About Umatilla County Drinking Water

Umatilla County is served by 17 water systems covering 18 communities. No community here has an open violation on record.

Of the communities reporting lead results, 10 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 8 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 18 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 1 of them.

Frequently Asked Questions

Is Umatilla County tap water safe to drink?▼
No community in Umatilla County has an open violation on record. 2 of 18 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Umatilla County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 8 reported none detected and 0 reported no result.
How many water systems serve Umatilla County?▼
17 community water systems serve 18 communities here.
← Back to Oregon water quality overview