States › Washington › Yakima County

Yakima County, WA Water Quality

Water quality data for 23 public water systems serving Yakima County, Washington — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 23 water systems · 26 cities
✅
Excellent — All Systems Performing Well

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

A

Yakima County Earns a A

Yakima County: 26 communities across 23 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 9 communities with a lead detection, 17 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 7 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
23
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
  • Toppenish
    Not detected
    No federal limits exceeded on record
    A
  • Union Gap
    Not detected
    No federal limits exceeded on record
    A
  • Wapato
    Not detected
    No federal limits exceeded on record
    A
  • Granger
    Not detected
    No federal limits exceeded on record
    A
  • Moxee
    2.20 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • White Swan
    Not detected
    1 significant inspection deficiency
    C
  • Parker
    5.00 ppb
    2 health-based violations since 2015
    B
  • Yakima
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Sunnyside
    1.40 ppb
    2 significant inspection deficiencies
    B
  • Ahtanum
    Not detected
    1 significant inspection deficiency
    A
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
8
5 – 10 ppb
1
No Data
17

All Cities in Yakima County

Yakima Not detected A
Sunnyside 1.40 ppb B
Grandview 1.20 ppb A
Toppenish Not detected A
Terrace Heights Not detected A
Selah Not detected A
Union Gap Not detected A
Wapato Not detected A
Granger Not detected A
Ahtanum Not detected A
Moxee 2.20 ppb A
Zillah Not detected B
Summitview Not detected A
Mabton 2.00 ppb B
Tieton 2.00 ppb B
Gleed Not detected A
Naches Not detected A
Harrah Not detected B
Buena Not detected B
Eschbach Not detected A
Cowiche 2.00 ppb B
White Swan Not detected C
Outlook 3.00 ppb B
Parker 5.00 ppb B
Tampico Not detected B
Donald 2.20 ppb B
Showing 26 cities
No active violations Active violations

About Yakima County Drinking Water

Yakima County is served by 23 water systems covering 26 communities. No community here has an open violation on record.

Of the communities reporting lead results, 9 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 17 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 7 of them.

Frequently Asked Questions

Is Yakima County tap water safe to drink?▼
No community in Yakima County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Yakima County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 17 reported none detected and 0 reported no result.
How many water systems serve Yakima County?▼
23 community water systems serve 26 communities here.
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