Three Rivers WWTP
409 Wolf Road, Three Rivers, MI 49093 · St. Joseph County · Publicly Owned Treatment Works
- Average flow
- 1.26 MGD
- Design flow
- —
- NPDES permit
- MI0020991
- Administratively continued
- Permit expires
- October 2026
- Population served
- 8,731
- CWNS 2022
Three Rivers WWTP is a publicly owned wastewater treatment works in Three Rivers, St. Joseph County, Michigan treating an average of 1.26 million gallons per day, serving about 8,731 residents. It discharges under NPDES permit MI0020991 (administratively continued), which expires in October 2026, with 45 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in September 2003.
Treatment technology
2 treatment structures and unit processes identified at Three Rivers WWTP.
Available with a free Klarifi account
See the full treatment train at Three Rivers WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 45
- Effluent violations
- 41
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 Three Rivers WWTP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- EPA inspections
- 0
- none on record
Latest case · Sep 2003
City of Three Rivers
Administrative order · CWA, NPDES Permit Violations · Final Order Issued
EPA's description of the case:
“Permittee exceeded the final effluent discharge limitations at Outfall 001A”
Source: EPA ECHO, civil enforcement case 05-2003-0388.
Full case history with a free Klarifi account
Every action against Three Rivers WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Industrial users and pretreatment
Industries that discharge process wastewater to Three Rivers WWTP, from the plant's pretreatment programme records.
- Industrial users
- 5
- 1 categorical
- Sampled for PFAS
- 3
- 2024
- Above 12 ng/L PFOS
- 2
- highest 142 ng/L
The highest PFOS samples came from Westside Security Landfill (WM) (Three Rivers), 142 ng/L; Ox Engineered Products (Constantine), 15.4 ng/L; American Axle & Manufacturing, Inc (Three Rivers). Most users are in paper and packaging and automotive, metal and equipment manufacturing.
Industrial users of Three Rivers WWTP →PFAS sources at all Michigan plants →
Unlock all 5 industrial users of this plant
Discharge flow, federal category, full PFAS sampling history, source documents and contacts for every industrial user of Three Rivers WWTP. Free with a Klarifi account.
Capital improvement projects in Three Rivers
Three Rivers's capital improvement plan lists 51 water, sewer and wastewater line items worth $22M starting 2025–2031. The largest budgeted items are shown here.
All water and sewer capital projects in Three Rivers →
| Project | Budget | Years |
|---|---|---|
| MDOT Roadways Watermain Replacements | $5,980,000 | 2029–2029 |
| Sewers Under MDOT Roads | $2,494,063 | 2029–2029 |
| Well 5, 6, 7 Generator Replacement | $1,296,000 | 2025–2025 |
| S HOOKER (W MICHIGAN TO BROADWAY) - DWSRF | $862,000 | 2031–2031 |
| Various Sewer Relining Projects | $805,000 | 2025–2025 |
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
17 verified contacts for Three Rivers WWTP, with validated emails and direct phone numbers.
Unlock 17 verified contacts (14 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Three Rivers WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Centreville · 6 mi away
1.69 MGD
White Pigeon · 10 mi away
0.23 MGD
Marcellus · 11 mi away
0.76 MGD
Mendon · 12 mi away
0.87 MGD
Sturgis · 15 mi away
1.14 MGD
Lawton · 19 mi away
0.1 MGD
Decatur · 21 mi away
1.07 MGD
Bronson · 23 mi away
0.24 MGD
Three Rivers 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 · Filter press · FOG · all terms