Sewickley STP
Lowber Rd, Herminie, PA 15637 · Westmoreland County · Publicly Owned Treatment Works
- Average flow
- 0.18 MGD
- Design flow
- 0.44 MGD
- NPDES permit
- PA0219142
- Expired
- Permit expires
- April 2026
- Population served
- —
- CWNS 2022
Sewickley STP is a publicly owned wastewater treatment works in Herminie, Westmoreland County, Pennsylvania treating an average of 0.18 million gallons per day against a permitted design capacity of 0.44 MGD. It discharges under NPDES permit PA0219142 (expired), which expires in April 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Sewickley STP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Sewickley STP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Pennsylvania
Sewickley · 3 mi away
0.0028 MGD
West Newton · 3 mi away
0.88 MGD
N Huntingdon · 3 mi away
1.85 MGD
Coulters · 4 mi away
0.02 MGD
Smithton · 5 mi away
0.02 MGD
Irwin · 6 mi away
3.28 MGD
Smithton · 7 mi away
0.04 MGD
Penn · 7 mi away
2.58 MGD
Sewickley 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 October 12, 2026; facility record last updated November 27, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms