ST CHARLES, CITY OF — NPDES permit IL0026808: limits, due date and EPA's record

NPDES permit IL0026808 · Minor POTW · effective, expires 2028-08-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among IL permits in EPA's filings — check your permit).

Limits in force (202)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. fahrenheit	MO MAX	report only	all year
001	Temperature, water deg. fahrenheit	MO MAX	report only	all year
001	Oxygen, dissolved [DO]	MO AV MN	>= 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MO AV MN	>= 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MO AV MN	>= 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MO AV MN	>= 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MN WK AV	>= 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MN WK AV	>= 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MN WK AV	>= 6 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	MN WK AV	>= 6 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	MN WK AV	>= 6 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	MN WK AV	>= 6 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	MN WK AV	>= 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	MN WK AV	>= 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	DAILY MN	>= 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	DAILY MN	>= 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	Mar, Apr, May, Jun, Jul
001	Oxygen, dissolved [DO]	DAILY MN	>= 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	Oxygen, dissolved [DO]	DAILY MN	>= 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
001	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
001	Solids, total suspended	MO AVG	<= 12 mg/L	all year
001	Solids, total suspended	MO AVG	<= 12 mg/L	all year
001	Solids, total suspended	MO AVG	<= 12 mg/L	all year
001	Solids, total suspended	MO AVG	<= 12 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 24 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 24 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 24 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 24 mg/L	all year
001	Solids, total suspended	MO AVG	<= 175 lb/d	all year
001	Solids, total suspended	MO AVG	<= 175 lb/d	all year
001	Solids, total suspended	MO AVG	<= 263 lb/d	all year
001	Solids, total suspended	MO AVG	<= 263 lb/d	all year
001	Solids, total suspended	DAILY MX	<= 350 lb/d	all year
001	Solids, total suspended	DAILY MX	<= 350 lb/d	all year
001	Solids, total suspended	DAILY MX	<= 526 lb/d	all year
001	Solids, total suspended	DAILY MX	<= 526 lb/d	all year
001	Oil & Grease	DAILY MX	report only	all year
001	Oil & Grease	DAILY MX	report only	all year
001	Nitrogen, total [as N]	DAILY MX	report only	all year
001	Nitrogen, total [as N]	DAILY MX	report only	all year
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.2 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.2 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2.5 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2.5 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.2 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.2 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2.5 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2.5 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.6 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.6 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.6 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.6 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 22 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 22 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 18 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 18 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 36 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 36 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 33 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 33 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 26 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 26 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 55 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= 55 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 72 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 72 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 44 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 44 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 96 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 96 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 107 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 107 lb/d	Mar, Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 66 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 66 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 145 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 145 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 3.8 mg/L	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 3.8 mg/L	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 3.8 mg/L	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 3.8 mg/L	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 55 lb/d	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 55 lb/d	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 83 lb/d	Mar
001	Nitrogen, ammonia total [as N]	WKLY AVG	<= 83 lb/d	Mar
001	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
001	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	MO AVG	<= 1 mg/L	all year
001	Phosphorus, total [as P]	MO AVG	<= 1 mg/L	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	MO AVG	<= 22 lb/d	all year
001	Phosphorus, total [as P]	MO AVG	<= 22 lb/d	all year
001	Phosphorus, dissolved	DAILY MX	report only	all year
001	Phosphorus, dissolved	DAILY MX	report only	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
001	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
001	Fluoride, total [as F]	DAILY MX	report only	all year
001	Fluoride, total [as F]	DAILY MX	report only	all year
001	Arsenic, total [as As]	DAILY MX	report only	all year
001	Arsenic, total [as As]	DAILY MX	report only	all year
001	Barium, total [as Ba]	DAILY MX	report only	all year
001	Barium, total [as Ba]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
001	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
001	Chromium, total [as Cr]	DAILY MX	report only	all year
001	Chromium, total [as Cr]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY MX	report only	all year
001	Iron, total [as Fe]	DAILY MX	report only	all year
001	Iron, total [as Fe]	DAILY MX	report only	all year
001	Iron, dissolved [as Fe]	DAILY MX	report only	all year
001	Iron, dissolved [as Fe]	DAILY MX	report only	all year
001	Lead, total [as Pb]	DAILY MX	report only	all year
001	Lead, total [as Pb]	DAILY MX	report only	all year
001	Manganese, total [as Mn]	DAILY MX	report only	all year
001	Manganese, total [as Mn]	DAILY MX	report only	all year
001	Nickel, total [as Ni]	DAILY MX	report only	all year
001	Nickel, total [as Ni]	DAILY MX	report only	all year
001	Silver, total [as Ag]	DAILY MX	report only	all year
001	Silver, total [as Ag]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Coliform, fecal - % samples exceeding limit	MAXIMUM	<= 10 %	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal - % samples exceeding limit	MAXIMUM	<= 10 %	May, Jun, Jul, Aug, Sep, Oct
001	Phenolics, total recoverable	DAILY MX	report only	all year
001	Phenolics, total recoverable	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
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	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Chlorine, total residual	DAILY MX	<= .05 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= .05 mg/L	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	DAILY MX	report only	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	DAILY MX	report only	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	DAILY MX	report only	May, Jun, Jul, Aug, Sep, Oct
001	Coliform, fecal general	DAILY MX	report only	May, Jun, Jul, Aug, Sep, Oct
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 146 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 146 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 219 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 219 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 292 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 292 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 439 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 439 lb/d	all year
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
INF	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
INF	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
INF	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year