States › Pennsylvania › Mercer County

Mercer County, PA Water Quality

Water quality data for 22 public water systems serving Mercer County, Pennsylvania — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 22 water systems · 35 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

Mercer County Earns a B

Mercer County: 35 communities across 22 water systems. 91.4% have no open violations.

  • Median lead where detected: 2.75 ppb
  • 22 communities with a lead detection, 11 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 13 with significant inspection deficiencies
  • 91.4% of communities have no open violations
2.75 ppb
Median Lead Level
County-wide, 90th percentile
22
Water Systems
Active CWS & NTNCWS
91%
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
  • Hermitage
    Not detected
    No federal limits exceeded on record
    A
  • Sharon
    Not detected
    No federal limits exceeded on record
    A
  • Grove City
    Not detected
    No federal limits exceeded on record
    B
  • Farrell
    Not detected
    No federal limits exceeded on record
    A
  • Sharpsville
    1.44 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Fredonia
    24.20 ppb
    Lead above the 15 ppb action level
    F
  • Fairview
    24.20 ppb
    Lead above the 15 ppb action level
    F
  • New Lebanon
    23.00 ppb
    Lead above the 15 ppb action level
    D
  • Jamestown
    26.00 ppb
    Lead above the 15 ppb action level
    D
  • Springfield
    8.00 ppb
    1 violation currently open
    D
County Lead Level — Median 2.75 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.75 ppb — 18.3% of the federal action level
Systems by Lead Level
Under 5 ppb
15
5 – 10 ppb
2
10 – 15 ppb
5
No Data
13

All Cities in Mercer County

Hermitage Not detected A
Sharon Not detected A
Grove City Not detected B
Greenville 0.84 ppb B
Farrell Not detected A
Sharpsville 1.44 ppb A
Pymatuning 1.00 ppb C
Hempfield 0.84 ppb B
Mercer Not detected A
Shenango Not detected A
Pine Not detected B
Lake Latonka 1.40 ppb B
Stoneboro 4.50 ppb B
South Pymatuning 17.00 ppb C
Coolspring 1.40 ppb B
West Middlesex Not detected A
Sandy Lake 3.50 ppb B
West Salem 4.00 ppb B
East Lackawannock Not detected A
Jamestown 26.00 ppb D
Jefferson Not detected A
Jackson 1.40 ppb B
Fredonia 24.20 ppb F
Lackawannock 2.00 ppb B
Sandy Lake 3.50 ppb B
Wilmington 0.95 ppb A
Springfield 8.00 ppb D
Findley Not detected A
Perry 2.00 ppb B
Liberty 8.00 ppb B
Wolf Creek Not reported B
French Creek 1.00 ppb B
Delaware Not reported B
New Lebanon 23.00 ppb D
Fairview 24.20 ppb F
Showing 35 cities
No active violations Active violations

About Mercer County Drinking Water

Mercer County is served by 22 water systems covering 35 communities. 91% have no open violations.

Of the communities reporting lead results, 22 recorded a detection, with a median of 2.75 ppb — 18% of the federal action level. 11 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 13 of them.

Frequently Asked Questions

Is Mercer County tap water safe to drink?▼
91% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Mercer County?▼
Among communities with a detection the median is 2.75 ppb, 18% of the 15 ppb action level. 11 reported none detected and 2 reported no result.
How many water systems serve Mercer County?▼
22 community water systems serve 35 communities here.
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