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Washington County, MN Water Quality

Water quality data for 20 public water systems serving Washington County, Minnesota — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 20 water systems · 30 cities
✅
Excellent — All Systems Performing Well

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

A

Washington County Earns a A

Washington County: 30 communities across 20 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 19 communities with a lead detection, 11 reporting none detected
  • 4 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
20
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
  • Pine Springs
    Not detected
    No federal limits exceeded on record
    A
  • Stillwater
    Not detected
    No federal limits exceeded on record
    A
  • Afton
    2.00 ppb
    No federal limits exceeded on record
    A
  • Cottage Grove
    2.00 ppb
    No federal limits exceeded on record
    A
  • Oakdale
    2.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Lake Elmo
    Not detected
    PFAS above the limit at 1 of 3 sampling points
    C
  • Woodbury
    2.00 ppb
    PFAS above the limit at 9 of 12 sampling points
    C
  • Stillwater
    2.00 ppb
    PFAS above the limit at 1 of 7 sampling points
    B
  • Newport
    2.00 ppb
    PFAS above the limit at 1 of 2 sampling points
    B
  • Afton
    2.00 ppb
    No federal limits exceeded on record
    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
19
No Data
11

All Cities in Washington County

Woodbury 2.00 ppb C
Cottage Grove 2.00 ppb A
Oakdale 2.00 ppb A
Stillwater 2.00 ppb B
Forest Lake 2.00 ppb A
Hugo Not detected A
Lake Elmo Not detected C
Mahtomedi Not detected A
St. Paul Park 1.00 ppb A
Oak Park Heights Not detected A
Newport 2.00 ppb B
Bayport Not detected B
Lakeland 2.00 ppb A
Lake St. Croix Beach 2.00 ppb A
Baytown Not detected B
Birchwood Village 2.00 ppb B
Willernie Not detected B
Grant 3.00 ppb B
Lakeland Shores 2.00 ppb A
Landfall 2.00 ppb A
Scandia 4.00 ppb B
Denmark Not detected B
St. Marys Point 2.00 ppb A
Marine on St. Croix Not detected B
Dellwood 1.00 ppb A
Grey Cloud Island 2.00 ppb A
West Lakeland 2.00 ppb A
Stillwater Not detected A
Pine Springs Not detected A
Afton 2.00 ppb A
Showing 30 cities
No active violations Active violations

About Washington County Drinking Water

Washington County is served by 20 water systems covering 30 communities. No community here has an open violation on record.

Of the communities reporting lead results, 19 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 11 reported none detected, which means below the laboratory limit rather than an absence of lead.

4 of 30 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Washington County tap water safe to drink?▼
No community in Washington County has an open violation on record. 4 of 30 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Washington County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 11 reported none detected and 0 reported no result.
How many water systems serve Washington County?▼
20 community water systems serve 30 communities here.
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