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Sewerage Systems, Flatrock Township, Ohio. NPDES permit OH0135631, in force until Apr 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (15 values), outfall 300 form A monthly (2 values), outfall 601 form A monthly (2 values), outfall 901 form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 48 reports late

Limits in force (21)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 65 mg/Lall year001
Solids, total suspendedweekly maximum≤ 90 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)May–Oct001
E. coli, MTEC-MFdaily maximumreport 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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 40 mg/Lall year001
Overflowsmonthly averagereport only (occur/mo)all year300
Overflowsdaily maximumreport only (occur/mo)all year300
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year601
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year601
Streamflowmonthly averagereport only (cfs)all year901
Streamflowdaily maximumreport only (cfs)all year901

How strict are these limits?

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

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/OH0135631 · MCP: https://passage-data.com/mcp