Marshall WWTP
801 Industrial Road, Marshall, MI 49068 · Calhoun County · Publicly Owned Treatment Works
- Average flow
- 1.53 MGD
- Design flow
- —
- NPDES permit
- MI0023540
- Effective
- Permit expires
- October 2030
- Population served
- 7,551
- CWNS 2022
Marshall WWTP is a publicly owned wastewater treatment works in Marshall, Calhoun County, Michigan treating an average of 1.53 million gallons per day, serving about 7,551 residents. It discharges under NPDES permit MI0023540 (effective), which expires in October 2030, with 0 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in January 2000.
Treatment technology
Treatment structures and unit processes at Marshall 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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Marshall WWTP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- EPA inspections
- 0
- none on record
Latest case · Jan 2000
MARSHALL WWTP
Administrative order · CWA, Sewage Sludge Disposal · Final Order No Penalty
Source: EPA ECHO, civil enforcement case 05-1997-0533.
Full case history with a free Klarifi account
Every action against Marshall WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Marshall
Marshall's capital improvement plan lists 61 water, sewer and wastewater line items worth $73M starting 2024–2030. The largest budgeted items are shown here.
All water and sewer capital projects in Marshall →
| Project | Budget | Years |
|---|---|---|
| Headworks & Equalization Basin Improvements | $20,000,000 | 2025–2026 |
| Headworks & Equalization Basin Improvements | $20,000,000 | 2025–2026 |
| Build New Iron Removal Plant | $5,000,000 | 2030–2031 |
| New Water Treatment Plant | $5,000,000 | 2028–2029 |
| Hanover Street Marshall to Kalamazoo | $2,000,000 | 2028–2029 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
22 verified contacts for Marshall WWTP, with validated emails and direct phone numbers.
Unlock 22 verified contacts (19 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Marshall WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Albion · 10 mi away
2.35 MGD
Homer · 11 mi away
0.95 MGD
Tekonsha · 12 mi away
0.85 MGD
Bellevue · 13 mi away
0.14 MGD
Albion · 13 mi away
1.35 MGD
Olivet · 13 mi away
1.59 MGD
Union City · 16 mi away
0.00074 MGD
Battle Creek · 16 mi away
7.58 MGD
Marshall 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 April 4, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms