Williamston WWTP
524 Sunset Road, Williamston, MI 48895 · Ingham County · Publicly Owned Treatment Works
- Average flow
- 0.44 MGD
- Design flow
- —
- NPDES permit
- MI0021717
- Effective
- Permit expires
- October 2027
- Population served
- 3,876
- CWNS 2022
Williamston WWTP is a publicly owned wastewater treatment works in Williamston, Ingham County, Michigan treating an average of 0.44 million gallons per day, serving about 3,876 residents. It discharges under NPDES permit MI0021717 (effective), which expires in October 2027, with 6 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Williamston WWTP.
Available with a free Klarifi account
See the full treatment train at Williamston WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Williamston WWTP.
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Nearby wastewater treatment plants in Michigan
Webberville · 6 mi away
0.8 MGD
Perry · 9 mi away
1.22 MGD
Mason · 11 mi away
5.69 MGD
Fowlerville · 11 mi away
0.54 MGD
Fowlerville · 11 mi away
0.1 MGD
East Lansing · 11 mi away
11.19 MGD
Lansing · 15 mi away
13.64 MGD
Holt · 15 mi away
2.47 MGD
Williamston 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 March 2, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms