Karns City STP
Karns City, PA · Butler County · Publicly Owned Treatment Works
- Average flow
- 0.01 MGD
- Design flow
- 0.04 MGD
- NPDES permit
- PA0239739
- Effective
- Permit expires
- May 2028
- Population served
- —
- CWNS 2022
Karns City STP is a publicly owned wastewater treatment works in Karns City, Butler County, Pennsylvania treating an average of 0.01 million gallons per day against a permitted design capacity of 0.04 MGD. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit PA0239739 (effective), which expires in May 2028, with 53 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 53
- Effluent violations
- 53
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Karns City STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Karns City STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Petrolia · 2 mi away
0.008 MGD
Petrolia · 2 mi away
0.009 MGD
Chicora · 4 mi away
0.1 MGD
Bruin · 4 mi away
0.01 MGD
East Brady · 5 mi away
0.01 MGD
East Brady · 6 mi away
0.15 MGD
Parker · 7 mi away
0.06 MGD
West Sunbury · 9 mi away
0.02 MGD
Karns City STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 4, 2026.