Madison Co Sewer Dist No 1
821 US Rte 42 NE, London, OH 43140 · Madison County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.15 MGD
- NPDES permit
- OH0102041
- Effective
- Permit expires
- December 2027
- Population served
- 600
- CWNS 2022
Madison Co Sewer Dist No 1 is a publicly owned wastewater treatment works in London, Madison County, Ohio treating an average of 0.06 million gallons per day against a permitted design capacity of 0.15 MGD, serving about 600 residents. It discharges under NPDES permit OH0102041 (effective), which expires in December 2027, with 11 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Madison Co Sewer Dist No 1.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 11
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Madison Co Sewer Dist No 1.
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 Ohio
West Jefferson · 2 mi away
0.0027 MGD
London · 5 mi away
0.02 MGD
West Jefferson · 6 mi away
0.0029 MGD
West Jefferson · 6 mi away
1.24 MGD
London · 6 mi away
3.31 MGD
London · 8 mi away
0.0057 MGD
Grove City · 9 mi away
0.00067 MGD
Plain City · 9 mi away
0.01 MGD
Madison Co Sewer Dist No 1: 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 November 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms