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Lincoln County, WY Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 20 water systems · 22 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Lincoln County Earns a B

Lincoln County: 22 communities across 20 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 17 communities with a lead detection, 5 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 3 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
  • Afton
    1.00 ppb
    No federal limits exceeded on record
    B
  • Nordic
    3.00 ppb
    No federal limits exceeded on record
    B
  • Thayne
    1.00 ppb
    No federal limits exceeded on record
    B
  • Smoot
    1.00 ppb
    No federal limits exceeded on record
    B
  • Etna
    1.00 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Star Valley Ranch
    8.00 ppb
    2 significant inspection deficiencies
    C
  • La Barge
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Opal
    16.00 ppb
    Lead above the 15 ppb action level
    C
  • Grover
    Not detected
    1 significant inspection deficiency
    C
  • Alpine
    2.00 ppb
    Copper above the 1,300 ppb action level
    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
12
5 – 10 ppb
4
10 – 15 ppb
1
No Data
5

All Cities in Lincoln County

Kemmerer 2.00 ppb B
Afton 1.00 ppb B
Star Valley Ranch 8.00 ppb C
Alpine 2.00 ppb B
Nordic 3.00 ppb B
Diamondville 2.00 ppb B
Cokeville 1.10 ppb B
Bedford 1.00 ppb B
La Barge Not detected C
Thayne 1.00 ppb B
Osmond Not detected B
Grover Not detected C
Fairview 5.00 ppb B
Freedom 5.00 ppb B
Alpine Northwest 2.00 ppb B
Smoot 1.00 ppb B
Etna 1.00 ppb B
Alpine Northeast 6.00 ppb B
Turnerville 1.00 ppb B
Auburn Not detected B
Opal 16.00 ppb C
Oakley Not detected B
Showing 22 cities
No active violations Active violations

About Lincoln County Drinking Water

Lincoln County is served by 20 water systems covering 22 communities. No community here has an open violation on record.

Of the communities reporting lead results, 17 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 5 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 3 of them.

Frequently Asked Questions

Is Lincoln County tap water safe to drink?▼
No community in Lincoln County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Lincoln County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 5 reported none detected and 0 reported no result.
How many water systems serve Lincoln County?▼
20 community water systems serve 22 communities here.
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