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Village of Mifflin WWTP

Sewerage Systems, Mifflin, Ohio. NPDES permit OH0146501, in force until Sep 30, 2030. Last 12 months: over a limit 11 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (23 values), outfall 300 form A monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
42 values over a limit, 0 required values missing, 0 of 26 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average37≤ 12 mg/L208%
October 2025Solids, total suspended, weekly maximum49≤ 18 mg/L172%
November 2025Solids, total suspended, monthly average21≤ 12 mg/L75%
November 2025Solids, total suspended, weekly maximum29≤ 18 mg/L61%
December 2025Solids, total suspended, monthly average18≤ 12 mg/L50%
December 2025Solids, total suspended, weekly maximum19≤ 18 mg/L6%
April 2026Oxygen, dissolved [DO], daily minimum5.9≥ 6 mg/L2%
July 2026Nitrogen, ammonia total [as N], monthly average.314≤ .114 kg/d175%
July 2026Nitrogen, ammonia total [as N], monthly average7.55≤ 1 mg/L655%
July 2026Nitrogen, ammonia total [as N], weekly maximum.629≤ .171 kg/d268%
July 2026Nitrogen, ammonia total [as N], weekly maximum15.1≤ 1.5 mg/L907%

Limits in force (41)

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≥ 6 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 12 mg/Lall year001
Solids, total suspendedweekly maximum≤ 18 mg/Lall year001
Solids, total suspendedmonthly average≤ 1.37 kg/dall year001
Solids, total suspendedweekly maximum≤ 2.05 kg/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 4.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .114 kg/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ .341 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ .171 kg/dMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ .511 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Feb, Apr, Jun, Aug, Oct, Dec001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Feb, Apr, Jun, Aug, Oct, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Feb, Apr, Jun, Aug, Oct, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Feb, Apr, Jun, Aug, Oct, 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 mean≤ 126 MPN/100mLMay–Oct001
E. coli, MTEC-MFweekly geometric mean≤ 284 MPN/100mLMay–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
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)Feb, Apr, Jun, Aug, Oct, Dec001
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)Feb, Apr, Jun, Aug, Oct, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.14 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 1.71 kg/dall year001
Overflowsmonthly averagereport only (occur/mo)all year300
Overflowsdaily maximumreport only (occur/mo)all year300
Biosolids weight indluding admixturesmonthly averagereport only (dry ton)Dec586
Biosolids weight indluding admixturesdaily maximumreport only (dry ton)Dec586
Sludge weight, drymonthly averagereport only (dry ton)Dec588
Sludge weight, drydaily maximumreport only (dry ton)Dec588

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/OH0146501 · MCP: https://passage-data.com/mcp