Chelsea WWTP
Chelsea, MI · Washtenaw County · Publicly Owned Treatment Works
- Average flow
- 0.85 MGD
- Design flow
- —
- NPDES permit
- MI0020737
- Effective
- Permit expires
- October 2026
- Population served
- 5,097
- CWNS 2022
Chelsea WWTP is a publicly owned wastewater treatment works in Chelsea, Washtenaw County, Michigan treating an average of 0.85 million gallons per day, serving about 5,097 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit MI0020737 (effective), which expires in October 2026, 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 Chelsea
Chelsea's capital improvement plan lists 102 water, sewer and wastewater line items worth $29M starting 2024–2031. The largest budgeted items are shown here.
All water and sewer capital projects in Chelsea →
| Project | Budget | Years |
|---|---|---|
| Water Plant Expansion | $7,500,000 | 2025–2032 |
| Water Main Project Lanewood Sub? (3 Phases) | $3,700,000 | 2026–2029 |
| Water Plant/Watermain Expansion & Updates – Will Include Residential Water Meters (Years 2–5) | $3,500,000 | 2025–2030 |
| 2nd Elevated Storage Tank | $2,000,000 | 2031–2032 |
| Lanewood Subdivision Reconstruction | $1,500,000 | 2027–2030 |
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
Decision-makers at Chelsea WWTP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Michigan
Dexter · 6 mi away
0.3 MGD
Manchester · 12 mi away
0.2 MGD
Saline · 13 mi away
0.03 MGD
Whitmore Lake · 14 mi away
0.61 MGD
Michigan Center · 14 mi away
1.62 MGD
Brighton · 16 mi away
0.94 MGD
Saline · 16 mi away
1.1 MGD
Clinton · 18 mi away
0.17 MGD
Chelsea 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 19, 2025.