Swatara Twp STP
Hummelstown, PA · Dauphin County · Publicly Owned Treatment Works
- Average flow
- 2.91 MGD
- Design flow
- 6.3 MGD
- NPDES permit
- PA0026735
- Effective
- Permit expires
- January 2027
- Population served
- 36,105
- CWNS 2022
Swatara Twp STP is a publicly owned wastewater treatment works in Hummelstown, Dauphin County, Pennsylvania treating an average of 2.91 million gallons per day against a permitted design capacity of 6.3 MGD, serving about 36,105 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit PA0026735 (effective), which expires in January 2027, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Swatara Twp STP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Swatara Twp STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Highspire · 5 mi away
0.58 MGD
Harrisburg · 6 mi away
0.45 MGD
Campbelltown · 8 mi away
0.12 MGD
Grantville · 8 mi away
0.17 MGD
York Haven · 8 mi away
0.45 MGD
Lemoyne · 8 mi away
0.22 MGD
New Cumberland · 8 mi away
4.33 MGD
Campbelltown · 9 mi away
0.14 MGD
Swatara Twp 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 March 4, 2025.