St Clair County-Algonac WWTP
Algonac, MI · St. Clair County · Publicly Owned Treatment Works
- Average flow
- 1.35 MGD
- Design flow
- —
- NPDES permit
- MI0020389
- Effective
- Permit expires
- October 2027
- Population served
- 11,424
- CWNS 2022
St Clair County-Algonac WWTP is a publicly owned wastewater treatment works in Algonac, St. Clair County, Michigan treating an average of 1.35 million gallons per day, serving about 11,424 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit MI0020389 (effective), which expires in October 2027, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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.
Capital improvement projects in Algonac
Algonac's capital improvement plan lists 21 water, sewer and wastewater line items worth $8M starting 2024–2027. The largest budgeted items are shown here.
All water and sewer capital projects in Algonac →
| Project | Budget | Years |
|---|---|---|
| Lee St. Replace 4" WM with 8" WM from Dixie North to dead end. 1,810 LF. | $1,237,000 | 2027–2029 |
| Lathrup. Replace 6" WM with 8" WM from size transition south to dead end. 1,620LF. | $1,110,000 | 2025–2027 |
| San Sewer Repairs to Pipes, Manholes, Siphons & Pump Stations in priority areas per SAW | $750,000 | 2024–2029 |
| Michigan St. Replace 4"WM with 8" WM from Mill to North of Maple & Mill St from Washington to M29 | $650,000 | 2027–2029 |
| Summer St & Washington. Loop existing 8" WM, possible connection to 12" WM in Washington St. | $650,000 | 2027–2029 |
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
1 verified contact for St Clair County-Algonac WWTP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at St Clair County-Algonac WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Marine City · 6 mi away
0.74 MGD
East China · 11 mi away
0.35 MGD
New Baltimore · 11 mi away
0.83 MGD
St Clair · 14 mi away
0.72 MGD
Mount Clemens · 16 mi away
3.06 MGD
Saint Clair Shores · 20 mi away
3.02 MGD
Marysville · 20 mi away
1.5 MGD
Grosse Pointe Woods · 21 mi away
7.7 MGD
St Clair County-Algonac 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 September 11, 2026; facility record last updated March 6, 2025.