London WWTP
4080 State Route 56, London, OH 43140 · Madison County · Publicly Owned Treatment Works
- Average flow
- 3.31 MGD
- Design flow
- 5.8 MGD
- NPDES permit
- OH0023779
- Expired
- Permit expires
- June 2026
- Population served
- 10,514
- CWNS 2022
London WWTP is a publicly owned wastewater treatment works in London, Madison County, Ohio treating an average of 3.31 million gallons per day against a permitted design capacity of 5.8 MGD, serving about 10,514 residents. It discharges under NPDES permit OH0023779 (expired), which expires in June 2026, with 21 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at London WWTP.
Available with a free Klarifi account
See the full treatment train at London WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 21
- Effluent violations
- 20
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for London WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at London WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
London · 6 mi away
0.06 MGD
West Jefferson · 6 mi away
0.0027 MGD
London · 7 mi away
0.0057 MGD
London · 9 mi away
0.02 MGD
West Jefferson · 10 mi away
1.24 MGD
West Jefferson · 11 mi away
0.0029 MGD
Grove City · 11 mi away
0.00067 MGD
South Vienna · 11 mi away
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London 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 September 16, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms