St Peters Pws
100 Treatment Lane, Saint Peters, MO 63376 · St Charles County · Publicly Owned Treatment Works
- Average flow
- 5.65 MGD
- Design flow
- —
- NPDES permit
- MO0030970
- Administratively continued
- Permit expires
- December 2024
- Population served
- 57,536
- CWNS 2022
St Peters Pws is a publicly owned wastewater treatment plant in Saint Peters, St Charles County, Missouri treating an average of 5.65 million gallons per day, serving about 57,536 residents. It discharges under NPDES permit MO0030970 (administratively continued), which expires in December 2024, with 0 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in July 2017.
Treatment technology
8 treatment structures and unit processes identified at St Peters Pws.
Available with a free Klarifi account
See the full treatment train at St Peters Pws: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for St Peters Pws in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $5,760
- all cases
- Compliance actions
- $1.5M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jul 2017
THE CITY OF ST PETERS, MISSOURI
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $1.5M
Source: EPA ECHO, civil enforcement case 07-2015-0302.
Full case history with a free Klarifi account
Every action against St Peters Pws with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
1 verified contact for St Peters Pws, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at St Peters Pws, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Missouri
O'Fallon · 5 mi away
7.55 MGD
Saint Charles · 6 mi away
4.45 MGD
St. Charles · 7 mi away
—
St. Charles · 8 mi away
4.2 MGD
Weldon Spring · 9 mi away
4.93 MGD
St. Charles · 9 mi away
0.0087 MGD
O'Fallon · 9 mi away
0.13 MGD
Old Monroe · 11 mi away
0.0025 MGD
St Peters Pws: 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 26, 2026; facility record last updated February 27, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms