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Madison County Sewer District #2

Sewerage Systems, London, Ohio. NPDES permit OH0130915, in force until Aug 31, 2030. Last 12 months: over a limit 31 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (32 values), outfall 300 form A monthly (2 values), outfall 601 form A monthly (8 values), outfall 901 form A monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 6 required values missing, 0 of 62 reports late

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

All 31 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total recoverable, daily maximum67≤ 60 ug/L12%
October 2025Copper, total recoverable, monthly average67≤ 42 ug/L60%
November 2025Copper, total recoverable, daily maximum65≤ 60 ug/L8%
November 2025Copper, total recoverable, monthly average65≤ 42 ug/L55%
December 2025Copper, total recoverable, daily maximum64≤ 60 ug/L7%
December 2025Copper, total recoverable, monthly average64≤ 42 ug/L52%
January 2026Copper, total recoverable, monthly average47≤ 42 ug/L12%
January 2026Nitrogen, ammonia total [as N], weekly maximum6.5≤ 4.5 mg/L44%
February 2026Copper, total recoverable, daily maximum61≤ 60 ug/L2%
February 2026Copper, total recoverable, monthly average61≤ 42 ug/L45%
February 2026Nitrogen, ammonia total [as N], weekly maximum6.9≤ 4.5 mg/L53%
April 2026Solids, total suspended, weekly maximum25≤ 18 mg/L39%
May 2026E. coli, MTEC-MF, monthly geometric meanT≤ 126 MPN/100mL—
May 2026E. coli, MTEC-MF, weekly geometric meanT≤ 284 MPN/100mL—
May 2026Nitrogen, ammonia total [as N], monthly average3.27≤ 1 mg/L227%
May 2026Nitrogen, ammonia total [as N], monthly average4.32≤ 1.14 kg/d279%
May 2026Nitrogen, ammonia total [as N], weekly maximum7.81≤ 1.5 mg/L421%
May 2026Nitrogen, ammonia total [as N], weekly maximum8.52≤ 1.71 kg/d398%
June 2026Nitrogen, ammonia total [as N], monthly average1.75≤ 1.14 kg/d54%
June 2026Nitrogen, ammonia total [as N], monthly average4.4≤ 1 mg/L340%
June 2026Nitrogen, ammonia total [as N], weekly maximum3.57≤ 1.71 kg/d109%
June 2026Nitrogen, ammonia total [as N], weekly maximum9.3≤ 1.5 mg/L520%
July 2026Copper, total recoverable, monthly average46≤ 42 ug/L10%
July 2026Nitrogen, ammonia total [as N], monthly average14.2≤ 1 mg/L1320%
July 2026Nitrogen, ammonia total [as N], monthly average5.33≤ 1.14 kg/d368%
July 2026Nitrogen, ammonia total [as N], weekly maximum27.3≤ 1.5 mg/L1720%
July 2026Nitrogen, ammonia total [as N], weekly maximum9.64≤ 1.71 kg/d464%
August 2026Nitrogen, ammonia total [as N], monthly average2.99≤ 1.14 kg/d162%
August 2026Nitrogen, ammonia total [as N], monthly average4.65≤ 1 mg/L365%
August 2026Nitrogen, ammonia total [as N], weekly maximum12.7≤ 1.5 mg/L747%
August 2026Nitrogen, ammonia total [as N], weekly maximum8.86≤ 1.71 kg/d418%

Limits in force (88)

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
Residue, tot fltrble [dried at 105 C]monthly averagereport only (mg/L)all year001
Residue, tot fltrble [dried at 105 C]daily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 12 mg/Lall year001
Solids, total suspendedweekly maximum≤ 18 mg/Lall year001
Solids, total suspendedmonthly average≤ 13.6 kg/dall year001
Solids, total suspendedweekly maximum≤ 20.5 kg/dall year001
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 4.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 3.41 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.14 kg/dMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 5.11 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.71 kg/dMay–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate 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
Cyanide, free-water plus wastewatersmonthly averagereport only (mg/L)Jun, Dec001
Cyanide, free-water plus wastewatersdaily maximumreport only (mg/L)Jun, Dec001
Nickel, total recoverablemonthly averagereport only (ug/L)Jun, Dec001
Nickel, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Zinc, total recoverablemonthly averagereport only (ug/L)Jun, Dec001
Zinc, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Cadmium, total recoverablemonthly averagereport only (ug/L)Jun, Dec001
Cadmium, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Lead, total recoverablemonthly averagereport only (ug/L)Jun, Dec001
Lead, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Chromium, total recoverablemonthly averagereport only (ug/L)Jun, Dec001
Chromium, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Copper, total recoverablemonthly average≤ 42 ug/Lall year001
Copper, total recoverabledaily maximum≤ 60 ug/Lall year001
Copper, total recoverablemonthly average≤ .048 kg/dall year001
Copper, total recoverabledaily maximum≤ .068 kg/dall year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)Jun, Dec001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)Jun, Dec001
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
Mercury, total low levelmonthly averagereport only (ng/L)Mar, Jun, Aug, Dec001
Mercury, total low leveldaily maximumreport only (ng/L)Mar, Jun, Aug, 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≤ 11.4 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 17.1 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
pHdaily minimumreport only (SU)all year601
pHdaily maximumreport only (SU)all year601
Solids, total suspendedmonthly averagereport only (mg/L)all year601
Solids, total suspendeddaily maximumreport only (mg/L)all year601
Copper, total recoverablemonthly averagereport only (ug/L)all year601
Copper, total recoverabledaily maximumreport only (ug/L)all year601
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year601
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year601
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec801
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec801
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec801
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec801
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec801
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec801
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)Jun–Aug801
E. coli, MTEC-MFdaily maximumreport only (MPN/100mL)Jun–Aug801
Temperature, water deg. centigrademonthly averagereport only (deg C)all year901
Temperature, water deg. centigradedaily maximumreport only (deg C)all year901
pHdaily minimumreport only (SU)all year901
pHdaily maximumreport only (SU)all year901
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec901
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec901
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec901
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec901
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec901
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec901
Hardness, total [as CaCO3]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec901
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec901
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)Jun–Aug901
E. coli, MTEC-MFdaily maximumreport only (MPN/100mL)Jun–Aug901

New limits from Sep 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total recoverable, monthly average38 ug/Ltighter46 ug/L (11 values)1.21×
Copper, total recoverable, daily maximum0.061 kg/dtighter0.02 kg/d (11 values)0.328×
Copper, total recoverable, daily maximum54 ug/Ltighter47 ug/L (11 values)0.87×
Copper, total recoverable, monthly average0.043 kg/dtighter0.02 kg/d (11 values)0.465×

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/OH0130915 · MCP: https://passage-data.com/mcp