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City of London

Water Supply, London, Ohio. NPDES permit OH0041734, in force until Jun 30, 2029. Last 12 months: over a limit once (last June 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (20 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
June 2026Solids, total suspended, monthly average19≤ 15 mg/L27%

Limits in force (21)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 11 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 20 mg/Lall year
Dichlorobromomethanemonthly averagereport only (ug/L)Sep
Dichlorobromomethanedaily maximumreport only (ug/L)Sep
Bromoformmonthly averagereport only (ug/L)Sep
Bromoformdaily maximumreport only (ug/L)Sep
Dibromochloromethanemonthly averagereport only (ug/L)Sep
Dibromochloromethanedaily maximumreport only (ug/L)Sep
Chloroformmonthly averagereport only (ug/L)Sep
Chloroformdaily maximumreport only (ug/L)Sep
Methyl bromide [Bromomethane]monthly averagereport only (ug/L)Sep
Methyl bromide [Bromomethane]daily maximumreport only (ug/L)Sep
Methyl chloride [Chloromethane]monthly averagereport only (ug/L)Sep
Methyl chloride [Chloromethane]daily maximumreport only (ug/L)Sep
Methylene chloridemonthly averagereport only (ug/L)Sep
Methylene chloridedaily maximumreport only (ug/L)Sep
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .038 mg/LMar, Jun, Aug, Dec

How strict are these limits?

Cited limits by parameter: Ohio's rules and the federal ones.

Same industry: the 147 Water Supply permits in Ohio.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0041734 · MCP: https://passage-data.com/mcp