Norristown Muni STP
Norristown, PA · Montgomery County · Publicly Owned Treatment Works
- Average flow
- 3.96 MGD
- Design flow
- 9.75 MGD
- NPDES permit
- PA0027421
- Effective
- Permit expires
- May 2029
- Population served
- —
- CWNS 2022
Norristown Muni STP is a publicly owned wastewater treatment works in Norristown, Montgomery County, Pennsylvania treating an average of 3.96 million gallons per day against a permitted design capacity of 9.75 MGD. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit PA0027421 (effective), which expires in May 2029, 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
1 verified contact for Norristown Muni STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Norristown Muni STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Plymouth Meeting · 1 mi away
3.6 MGD
Bridgeport · 1 mi away
0.41 MGD
King Of Prussia · 1 mi away
2.57 MGD
Conshohocken · 3 mi away
1.18 MGD
Lafayette Hill · 3 mi away
0.73 MGD
King Of Prussia · 4 mi away
2.27 MGD
Worcester · 6 mi away
0.14 MGD
North Wales · 6 mi away
2.21 MGD
Norristown Muni 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 1, 2025.