St Mary Parish Water & Sewer Commission #4 WWTP
La Hwy 326, Charenton, LA 70523 · St. Mary County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.9 MGD
- NPDES permit
- LA0100480
- Effective
- Permit expires
- November 2026
- Population served
- —
- CWNS 2022
St Mary Parish Water & Sewer Commission #4 WWTP is a publicly owned wastewater treatment works in Charenton, St. Mary County, Louisiana treating an average of 0.06 million gallons per day against a permitted design capacity of 0.9 MGD. It discharges under NPDES permit LA0100480 (effective), which expires in November 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at St Mary Parish Water & Sewer Commission #4 WWTP.
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
1 verified contact for St Mary Parish Water & Sewer Commission #4 WWTP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at St Mary Parish Water & Sewer Commission #4 WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Louisiana
Four Corners · 6 mi away
0.12 MGD
Centerville · 10 mi away
0.16 MGD
Jeanerette · 11 mi away
0.63 MGD
New Iberia · 16 mi away
1.6 MGD
Loreauville · 19 mi away
0.07 MGD
New Iberia · 19 mi away
0.04 MGD
Patterson · 20 mi away
3.17 MGD
Morgan City · 23 mi away
0.21 MGD
St Mary Parish Water & Sewer Commission #4 WWTP: 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 July 18, 2023.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms