States › Washington › Grant County

Grant County, WA Water Quality

Water quality data for 23 public water systems serving Grant 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 · 25 cities
✅
Excellent — All Systems Performing Well

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

A

Grant County Earns a A

Grant County: 25 communities across 23 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.50 ppb
  • 11 communities with a lead detection, 14 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.5 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
  • Ephrata
    Not detected
    No federal limits exceeded on record
    A
  • Desert Aire
    1.00 ppb
    No federal limits exceeded on record
    B
  • Royal City
    1.20 ppb
    No federal limits exceeded on record
    B
  • Soap Lake
    Not detected
    No federal limits exceeded on record
    B
  • Electric City
    2.60 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Moses Lake
    3.20 ppb
    PFAS above the limit at 1 of 18 sampling points
    C
  • Moses Lake North
    3.20 ppb
    PFAS above the limit at 1 of 18 sampling points
    C
  • Cascade Valley
    3.20 ppb
    PFAS above the limit at 1 of 18 sampling points
    C
  • Beverly
    Not detected
    3 health-based violations since 2015
    B
  • Quincy
    2.50 ppb
    1 significant inspection deficiency
    A
County Lead Level — Median 2.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.5 ppb — 16.7% of the federal action level
Systems by Lead Level
Under 5 ppb
11
No Data
14

All Cities in Grant County

Moses Lake 3.20 ppb C
Ephrata Not detected A
Quincy 2.50 ppb A
Moses Lake North 3.20 ppb C
Mattawa Not detected A
Warden Not detected A
Desert Aire 1.00 ppb B
Cascade Valley 3.20 ppb C
Royal City 1.20 ppb B
Soap Lake Not detected B
Lakeview Not detected B
Electric City 2.60 ppb B
Grand Coulee Not detected B
George Not detected B
Coulee City Not detected B
Marine View 1.60 ppb B
Beverly Not detected B
Schwana Not detected B
Wilson Creek 1.10 ppb B
Hartline 3.00 ppb B
Sunland Estates Not detected B
Crescent Bar 0.50 ppb B
Wheeler Not detected B
Banks Lake South Not detected B
Krupp Not detected B
Showing 25 cities
No active violations Active violations

About Grant County Drinking Water

Grant County is served by 23 water systems covering 25 communities. No community here has an open violation on record.

Of the communities reporting lead results, 11 recorded a detection, with a median of 2.50 ppb — 17% of the federal action level. 14 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 25 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 Grant County tap water safe to drink?▼
No community in Grant County has an open violation on record. 3 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Grant County?▼
Among communities with a detection the median is 2.50 ppb, 17% of the 15 ppb action level. 14 reported none detected and 0 reported no result.
How many water systems serve Grant County?▼
23 community water systems serve 25 communities here.
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