City of London — NPDES permit OH0023779: limits, due date and EPA's record

NPDES permit OH0023779 · Major POTW · administratively continued, expires 2026-06-30 · EPA's file as of 2026-09-19

This permit expired on 2026-06-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (10), E. coli, MTEC-MF (4).

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (178)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. centigrade	MO AVG	report only	all year
001	Temperature, water deg. centigrade	DAILY MX	report only	all year
001	Oxygen, dissolved [DO]	DAILY MN	>= 5.5 mg/L	all year
001	Solids, total suspended	MO AVG	<= 12 mg/L	all year
001	Solids, total suspended	WKLY MAX	<= 18 mg/L	all year
001	Solids, total suspended	MO AVG	<= 263 kg/d	all year
001	Solids, total suspended	WKLY MAX	<= 395 kg/d	all year
001	Oil and grease, hexane extr method	DAILY MX	<= 10 mg/L	all year
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.1 mg/L	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
001	Nitrogen, ammonia total [as N]	WKLY MAX	<= 1.65 mg/L	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	WKLY MAX	<= 2.25 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 24.2 kg/d	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 33 kg/d	Jan, Feb, Mar, Apr, Nov, Dec
001	Nitrogen, ammonia total [as N]	WKLY MAX	<= 36.3 kg/d	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	WKLY MAX	<= 49.4 kg/d	Jan, Feb, Mar, Apr, Nov, Dec
001	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
001	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
001	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	MO AVG	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphate, ortho, dissolved [as P]	MO AVG	report only	all year
001	Phosphate, ortho, dissolved [as P]	DAILY MX	report only	all year
001	Nickel, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
001	Nickel, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Zinc, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
001	Zinc, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Cadmium, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
001	Cadmium, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Lead, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
001	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Chromium, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
001	Chromium, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Copper, total recoverable	MO AVG	report only	all year
001	Copper, total recoverable	DAILY MX	report only	all year
001	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	Mar, Jun, Aug, Dec
001	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	Mar, Jun, Aug, Dec
001	E. coli, MTEC-MF	MO GEOMN	<= 126 MPN/100mL	May, Jun, Jul, Aug, Sep, Oct
001	E. coli, MTEC-MF	WK GEOMN	<= 284 MPN/100mL	May, Jun, Jul, Aug, Sep, Oct
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Mercury, total low level	MO AVG	report only	Mar, Jun, Aug, Dec
001	Mercury, total low level	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Cyanide, free available	MO AVG	report only	Mar, Jun, Aug, Dec
001	Cyanide, free available	DAILY MX	report only	Mar, Jun, Aug, Dec
001	Toxicity [acute], Ceriodaphnia dubia	MO AVG	report only	Jun
001	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	report only	Jun
001	Toxicity [chronic], Ceriodaphnia dubia	MO AVG	<= 1.07 tox chronic	Jun, Oct
001	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MO AVG	report only	Jun
001	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	Jun
001	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MO AVG	<= 1.07 tox chronic	Jun, Oct
001	pH, maximum	DAILY MX	<= 9 SU	all year
001	pH, minimum	DAILY MN	>= 6.5 SU	all year
001	Solids, total dissolved- 180 deg. C	MO AVG	report only	all year
001	Solids, total dissolved- 180 deg. C	DAILY MX	report only	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	WKLY MAX	<= 15 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 220 kg/d	all year
001	BOD, carbonaceous [5 day, 20 C]	WKLY MAX	<= 329 kg/d	all year
300	Overflows	MO AVG	report only	all year
300	Overflows	DAILY MX	report only	all year
581	Nitrogen, ammonia in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
581	Nitrogen, ammonia in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	Mar, Jun, Sep, Dec
581	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Phosphorous, total, in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
581	Phosphorous, total, in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Potassium, in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
581	Potassium, in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Arsenic, dry weight	DAILY MX	<= 75 mg/kg	Mar, Jun, Sep, Dec
581	Cadmium, in bottom deposits [dry wgt]	DAILY MX	<= 85 mg/kg	Mar, Jun, Sep, Dec
581	Copper in bottom deposits [dry wgt]	DAILY MX	<= 4300 mg/kg	Mar, Jun, Sep, Dec
581	Lead, total dry weight [as Pb]	DAILY MX	<= 840 mg/kg	Mar, Jun, Sep, Dec
581	Nickel, tot in bottom deposits [dry wgt]	DAILY MX	<= 420 mg/kg	Mar, Jun, Sep, Dec
581	Zinc in bottom deposits [dry wgt]	DAILY MX	<= 7500 mg/kg	Mar, Jun, Sep, Dec
581	Selenium, dry weight	DAILY MX	<= 100 mg/kg	Mar, Jun, Sep, Dec
581	Biosolids weight indluding admixtures	MO AVG	report only	Mar, Jun, Sep, Dec
581	Biosolids weight indluding admixtures	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Sludge weight, dry	MO AVG	report only	Mar, Jun, Sep, Dec
581	Sludge weight, dry	DAILY MX	report only	Mar, Jun, Sep, Dec
581	Mercury, tot in bot deposits [dry wgt]	DAILY MX	<= 57 mg/kg	Mar, Jun, Sep, Dec
581	Molybdenum, sludge, total, dry weight [as Mo]	DAILY MX	<= 75 mg/kg	Mar, Jun, Sep, Dec
584	Nitrogen, ammonia in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
584	Nitrogen, ammonia in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	Mar, Jun, Sep, Dec
584	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Phosphorous, total, in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
584	Phosphorous, total, in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Potassium, in bottom deposits	MO AVG	report only	Mar, Jun, Sep, Dec
584	Potassium, in bottom deposits	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Arsenic, dry weight	MO AVG	<= 41 mg/kg	Mar, Jun, Sep, Dec
584	Arsenic, dry weight	DAILY MX	<= 75 mg/kg	Mar, Jun, Sep, Dec
584	Cadmium, in bottom deposits [dry wgt]	MO AVG	<= 39 mg/kg	Mar, Jun, Sep, Dec
584	Cadmium, in bottom deposits [dry wgt]	DAILY MX	<= 85 mg/kg	Mar, Jun, Sep, Dec
584	Copper in bottom deposits [dry wgt]	MO AVG	<= 1500 mg/kg	Mar, Jun, Sep, Dec
584	Copper in bottom deposits [dry wgt]	DAILY MX	<= 4300 mg/kg	Mar, Jun, Sep, Dec
584	Lead, total dry weight [as Pb]	MO AVG	<= 300 mg/kg	Mar, Jun, Sep, Dec
584	Lead, total dry weight [as Pb]	DAILY MX	<= 840 mg/kg	Mar, Jun, Sep, Dec
584	Nickel, tot in bottom deposits [dry wgt]	MO AVG	<= 420 mg/kg	Mar, Jun, Sep, Dec
584	Nickel, tot in bottom deposits [dry wgt]	DAILY MX	<= 420 mg/kg	Mar, Jun, Sep, Dec
584	Zinc in bottom deposits [dry wgt]	MO AVG	<= 2800 mg/kg	Mar, Jun, Sep, Dec
584	Zinc in bottom deposits [dry wgt]	DAILY MX	<= 7500 mg/kg	Mar, Jun, Sep, Dec
584	Selenium, dry weight	MO AVG	<= 100 mg/kg	Mar, Jun, Sep, Dec
584	Selenium, dry weight	DAILY MX	<= 100 mg/kg	Mar, Jun, Sep, Dec
584	Fecal coliform	DAILY MX	<= 1000 MPN/g	Mar, Jun, Sep, Dec
584	Biosolids weight indluding admixtures	MO AVG	report only	Mar, Jun, Sep, Dec
584	Biosolids weight indluding admixtures	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Sludge weight, dry	MO AVG	report only	Mar, Jun, Sep, Dec
584	Sludge weight, dry	DAILY MX	report only	Mar, Jun, Sep, Dec
584	Mercury, tot in bot deposits [dry wgt]	MO AVG	<= 17 mg/kg	Mar, Jun, Sep, Dec
584	Mercury, tot in bot deposits [dry wgt]	DAILY MX	<= 57 mg/kg	Mar, Jun, Sep, Dec
584	Molybdenum, sludge, total, dry weight [as Mo]	MO AVG	<= 75 mg/kg	Mar, Jun, Sep, Dec
584	Molybdenum, sludge, total, dry weight [as Mo]	DAILY MX	<= 75 mg/kg	Mar, Jun, Sep, Dec
586	Biosolids weight indluding admixtures	MO AVG	report only	Dec
586	Biosolids weight indluding admixtures	DAILY MX	report only	Dec
588	Sludge weight, dry	MO AVG	report only	Dec
588	Sludge weight, dry	DAILY MX	report only	Dec
588	Sludge waste from secondary clarifiers	MO AVG	report only	Dec
588	Sludge waste from secondary clarifiers	DAILY MX	report only	Dec
601	Solids, total suspended	MO AVG	report only	all year
601	Solids, total suspended	DAILY MX	report only	all year
601	Cyanide, total [as CN]	MO AVG	report only	Mar, Jun, Aug, Dec
601	Cyanide, total [as CN]	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Nickel, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
601	Nickel, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Zinc, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
601	Zinc, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Cadmium, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
601	Cadmium, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Lead, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
601	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Chromium, total recoverable	MO AVG	report only	Mar, Jun, Aug, Dec
601	Chromium, total recoverable	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Copper, total recoverable	MO AVG	report only	all year
601	Copper, total recoverable	DAILY MX	report only	all year
601	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	Mar, Jun, Aug, Dec
601	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	Mar, Jun, Aug, Dec
601	Mercury, total low level	MO AVG	report only	Mar, Jun, Aug, Dec
601	Mercury, total low level	DAILY MX	report only	Mar, Jun, Aug, Dec
601	pH, maximum	DAILY MX	report only	all year
601	pH, minimum	DAILY MN	report only	all year
601	BOD, carbonaceous [5 day, 20 C]	MO AVG	report only	all year
601	BOD, carbonaceous [5 day, 20 C]	DAILY MX	report only	all year
801	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
801	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
801	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
801	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
801	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
801	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
801	Phosphorus, total [as P]	MO AVG	report only	all year
801	Phosphorus, total [as P]	DAILY MX	report only	all year
801	E. coli, MTEC-MF	MO GEOMN	report only	Jun, Jul, Aug
801	E. coli, MTEC-MF	DAILY MX	report only	Jun, Jul, Aug
801	%Effect Static Renewal 48Hr Acute Ceriodaphnia dubia	MO AVG	report only	Jun
801	%Effect Static Renewal 48Hr Acute Ceriodaphnia dubia	DAILY MX	report only	Jun
801	%Effect Static Renewal 96Hr Acute Pimephales promelas	MO AVG	report only	Jun
801	%Effect Static Renewal 96Hr Acute Pimephales promelas	DAILY MX	report only	Jun
801	%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	MO AVG	report only	Jun, Oct
801	%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	DAILY MX	report only	Jun, Oct
801	%Effect Static Renewal 7Day Chronic Pimephales promelas	MO AVG	report only	Jun, Oct
801	%Effect Static Renewal 7Day Chronic Pimephales promelas	DAILY MX	report only	Jun, Oct
901	Temperature, water deg. centigrade	MO AVG	report only	all year
901	Temperature, water deg. centigrade	DAILY MX	report only	all year
901	pH	DAILY MN	report only	all year
901	pH	DAILY MX	report only	all year
901	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
901	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
901	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
901	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
901	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
901	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
901	Phosphorus, total [as P]	MO AVG	report only	all year
901	Phosphorus, total [as P]	DAILY MX	report only	all year
901	Hardness, total [as CaCO3]	MO AVG	report only	all year
901	Hardness, total [as CaCO3]	DAILY MX	report only	all year
901	E. coli, MTEC-MF	MO GEOMN	report only	Jun, Jul, Aug
901	E. coli, MTEC-MF	DAILY MX	report only	Jun, Jul, Aug