St Louis WWTP
404 East Prospect Street, St. Louis, MI 48880 · Gratiot County · Publicly Owned Treatment Works
- Average flow
- 1.01 MGD
- Design flow
- —
- NPDES permit
- MI0021555
- Effective
- Permit expires
- October 2027
- Population served
- 8,572
- CWNS 2022
St Louis WWTP is a publicly owned wastewater treatment works in St. Louis, Gratiot County, Michigan treating an average of 1.01 million gallons per day, serving about 8,572 residents. It discharges under NPDES permit MI0021555 (effective), which expires in October 2027, with 9 recorded violations in the last three years.
Treatment technology
4 treatment structures and unit processes identified at St Louis WWTP.
Available with a free Klarifi account
See the full treatment train at St Louis WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 1
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 Louis WWTP in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 1
- latest Jun 2004
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against St Louis WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
3 verified contacts for St Louis WWTP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at St Louis WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Alma · 3 mi away
1.52 MGD
Breckenridge · 6 mi away
—
Ithaca · 9 mi away
2.58 MGD
Shepherd · 9 mi away
0.33 MGD
Merrill · 13 mi away
0.92 MGD
Mount Pleasant · 13 mi away
0.26 MGD
Mount Pleasant · 16 mi away
2.26 MGD
Mt Pleasant · 17 mi away
1.25 MGD
St Louis 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 March 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms