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Sewerage Systems, Norwalk, Ohio. NPDES permit OH0143405 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit once (last August 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 4 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimitOver by
August 2026BOD, carbonaceous [5 day, 20 C], monthly average11≤ 10 mg/L10%

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year001
pHdaily minimum≥ 6.5 SUMar, Jun, Aug, Dec001
pHdaily maximum≤ 9 SUMar, Jun, Aug, Dec001
Solids, total suspendedmonthly average≤ 12 mg/LMar, Jun, Aug, Dec001
Solids, total suspendedweekly maximum≤ 18 mg/LMar, Jun, Aug, Dec001
Solids, total suspendedmonthly average≤ .682 kg/dMar, Jun, Aug, Dec001
Solids, total suspendedweekly maximum≤ 1.03 kg/dMar, Jun, Aug, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMar, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJun, Aug, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 4.5 mg/LMar, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.5 mg/LJun, Aug, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .171 kg/dMar, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .0568 kg/dJun, Aug, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ .256 kg/dMar, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ .0852 kg/dJun, Aug, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec001
Turbidity [severity]monthly averagereport only (severity)all year001
Turbidity [severity]daily maximumreport only (severity)all year001
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)May–Oct001
E. coli, MTEC-MFweekly geometric meanreport only (MPN/100mL)May–Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .019 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMar, Jun, Aug, Dec001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 15 mg/LMar, Jun, Aug, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ .568 kg/dMar, Jun, Aug, Dec001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ .852 kg/dMar, Jun, Aug, Dec001
Sludge weight, drymonthly averagereport only (dry ton)Dec588
Sludge weight, drydaily maximumreport only (dry ton)Dec588
Sludge waste from secondary clarifiersmonthly averagereport only (gal)Dec588
Sludge waste from secondary clarifiersdaily maximumreport only (gal)Dec588

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0143405 · MCP: https://passage-data.com/mcp