States › Pennsylvania › Butler County

Butler County, PA Water Quality

Water quality data for 27 public water systems serving Butler County, Pennsylvania — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 27 water systems · 45 cities
✅
Excellent — All Systems Performing Well

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

A

Butler County Earns a A

Butler County: 45 communities across 27 water systems. 97.8% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 40 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 8 with significant inspection deficiencies
  • 97.8% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
27
Water Systems
Active CWS & NTNCWS
97%
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
  • Butler
    2.00 ppb
    No federal limits exceeded on record
    A
  • Butler
    2.00 ppb
    No federal limits exceeded on record
    A
  • Center
    2.00 ppb
    No federal limits exceeded on record
    A
  • Slippery Rock
    0.55 ppb
    No federal limits exceeded on record
    A
  • Jackson
    2.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Muddy Creek
    1.00 ppb
    1 violation currently open
    D
  • Brady
    16.00 ppb
    Lead above the 15 ppb action level
    D
  • Marion
    28.00 ppb
    Lead above the 15 ppb action level
    D
  • Winfield
    74.00 ppb
    Lead above the 15 ppb action level
    C
  • Evans City
    17.00 ppb
    Lead above the 15 ppb action level
    C
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
33
5 – 10 ppb
3
10 – 15 ppb
4
No Data
5

All Cities in Butler County

Cranberry 0.53 ppb A
Butler 2.00 ppb A
Butler 2.00 ppb A
Center 2.00 ppb A
Buffalo 2.72 ppb C
Slippery Rock 0.55 ppb A
Adams 0.59 ppb A
Zelienople 6.04 ppb C
Jackson 2.00 ppb A
Slippery Rock 0.55 ppb A
Connoquenessing 2.00 ppb A
Summit 2.00 ppb A
Jefferson 2.00 ppb A
Seven Fields 5.00 ppb B
Evans City 17.00 ppb C
Mars 3.00 ppb B
Saxonburg 2.00 ppb A
Franklin 2.00 ppb A
Lancaster 2.00 ppb A
Clinton 2.00 ppb A
Forward 2.00 ppb A
Harmony 2.20 ppb C
Middlesex Not reported B
Chicora 3.90 ppb B
East Butler 2.00 ppb A
Fairview 2.00 ppb A
Connoquenessing 2.00 ppb A
Oakland 2.00 ppb A
Valencia 1.39 ppb A
Muddy Creek 1.00 ppb D
Winfield 74.00 ppb C
Brady 16.00 ppb D
Penn 2.00 ppb A
Prospect 2.00 ppb B
Donegal 2.00 ppb A
Marion 28.00 ppb D
Worth Not reported B
Petrolia Not detected B
Clay Not reported B
Clearfield 1.00 ppb C
Concord Not reported B
Mercer 9.00 ppb B
Parker 1.00 ppb B
Harrisville 1.10 ppb B
Allegheny 1.00 ppb B
Showing 45 cities
No active violations Active violations

About Butler County Drinking Water

Butler County is served by 27 water systems covering 45 communities. 98% have no open violations.

Of the communities reporting lead results, 40 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 1 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 8 of them.

Frequently Asked Questions

Is Butler County tap water safe to drink?▼
98% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Butler County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 1 reported none detected and 4 reported no result.
How many water systems serve Butler County?▼
27 community water systems serve 45 communities here.
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