Ann Arbor WWTP
Ann Arbor, MI · Washtenaw County · Publicly Owned Treatment Works
- Average flow
- 13.6 MGD
- Design flow
- —
- NPDES permit
- MI0022217
- Administratively continued
- Permit expires
- October 2025
- Population served
- 152,564
- CWNS 2022
Ann Arbor WWTP is a publicly owned wastewater treatment works in Ann Arbor, Washtenaw County, Michigan treating an average of 13.6 million gallons per day, serving about 152,564 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit MI0022217 (administratively continued), which expires in October 2025, with 9 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
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Ann Arbor
Ann Arbor's capital improvement plan lists 151 water, sewer and wastewater line items worth $503M starting 2025–2032. The largest budgeted items are shown here.
All water and sewer capital projects in Ann Arbor →
| Project | Budget | Years |
|---|---|---|
| WTP: Plant 1 Replacement Project | $142,000,000 | 2025–2031 |
| High Level Trunkline Sewer Capacity Improvements | $20,500,000 | 2025–2027 |
| Dams: Barton Dam Embankment Rehabilitation | $12,920,000 | 2025–2027 |
| WTP: Plant 2 Readiness | $9,050,000 | 2028–2030 |
| Galvanized Water Services Replacements | $9,000,000 | 2025–2029 |
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
36 verified contacts for Ann Arbor WWTP, with validated emails and direct phone numbers.
Unlock 36 verified contacts (33 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Ann Arbor WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Ypsilanti · 6 mi away
23.05 MGD
Saline · 10 mi away
1.1 MGD
Salem · 10 mi away
0.02 MGD
Dexter · 13 mi away
0.3 MGD
South Lyon · 13 mi away
0.97 MGD
Whitmore Lake · 13 mi away
0.61 MGD
Milan · 13 mi away
0.83 MGD
Saline · 14 mi away
0.03 MGD
Ann Arbor 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 May 20, 2025.