ILLINOIS AMERICAN WATER COMPANY — NPDES permit IL0033481: limits, due date and EPA's record

NPDES permit IL0033481 · Major POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

This permit expired on 2026-08-31 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: Coliform, fecal general (9), Chlorine, total residual (4).

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (135)

Outfall	Parameter	Statistic	Limit	Months
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	MO AVG	<= 25 mg/L	all year
001	Solids, total suspended	WKLY AVG	<= 45 mg/L	all year
001	Solids, total suspended	MO AVG	<= 7193 lb/d	all year
001	Solids, total suspended	WKLY AVG	<= 12948 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, ammonia total [as N]	MO AVG	<= 7.9 mg/L	Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 7.9 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.5 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.5 mg/L	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.5 mg/L	Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 10.1 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2273 lb/d	Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2273 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 2158 lb/d	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 2158 lb/d	Jan, Feb, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 2158 lb/d	Apr, May, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 2906 lb/d	Jun, Jul, Aug
001	Phosphorus, total [as P]	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	Beryllium, total [as Be]	DAILY MX	report only	all year
001	Beryllium, total [as Be]	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	Thallium, total [as Tl]	DAILY MX	report only	all year
001	Thallium, total [as Tl]	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	Antimony, total [as Sb]	DAILY MX	report only	all year
001	Antimony, total [as Sb]	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	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	DAILY MX	report only	all year
001	Chlorine, total residual	DAILY MX	<= .75 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
001	Chlorine, total residual	DAILY MX	<= .75 mg/L	May, Jun, Jul, Aug, Sep, Oct
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	DAILY MX	<= 400 #/100mL	May, Jun, Jul, Aug, Sep, Oct
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 40 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 5755 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 11509 lb/d	all year
003	Overflows	MO TOTAL	report only	all year
004	Overflows	MO TOTAL	report only	all year
A01	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
A01	pH	MINIMUM	>= 6 SU	all year
A01	pH	MAXIMUM	<= 9 SU	all year
A01	Solids, total suspended	MO AVG	report only	all year
A01	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
A01	Chlorine, total residual	MO AVG	<= .75 mg/L	all year
A01	Coliform, fecal general	DAILY MX	<= 400 #/100mL	all year
A01	Flow, total	MO TOTAL	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	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
INFL	Oil & Grease	DAILY MX	report only	all year
INFL	Oil & Grease	DAILY MX	report only	all year
INFL	Cyanide, total [as CN]	DAILY MX	report only	all year
INFL	Cyanide, total [as CN]	DAILY MX	report only	all year
INFL	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
INFL	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
INFL	Fluoride, total [as F]	DAILY MX	report only	all year
INFL	Fluoride, total [as F]	DAILY MX	report only	all year
INFL	Arsenic, total [as As]	DAILY MX	report only	all year
INFL	Arsenic, total [as As]	DAILY MX	report only	all year
INFL	Barium, total [as Ba]	DAILY MX	report only	all year
INFL	Barium, total [as Ba]	DAILY MX	report only	all year
INFL	Beryllium, total [as Be]	DAILY MX	report only	all year
INFL	Beryllium, total [as Be]	DAILY MX	report only	all year
INFL	Cadmium, total [as Cd]	DAILY MX	report only	all year
INFL	Cadmium, total [as Cd]	DAILY MX	report only	all year
INFL	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
INFL	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
INFL	Chromium, total [as Cr]	DAILY MX	report only	all year
INFL	Chromium, total [as Cr]	DAILY MX	report only	all year
INFL	Copper, total [as Cu]	DAILY MX	report only	all year
INFL	Copper, total [as Cu]	DAILY MX	report only	all year
INFL	Iron, total [as Fe]	DAILY MX	report only	all year
INFL	Iron, total [as Fe]	DAILY MX	report only	all year
INFL	Iron, dissolved [as Fe]	DAILY MX	report only	all year
INFL	Iron, dissolved [as Fe]	DAILY MX	report only	all year
INFL	Lead, total [as Pb]	DAILY MX	report only	all year
INFL	Lead, total [as Pb]	DAILY MX	report only	all year
INFL	Manganese, total [as Mn]	DAILY MX	report only	all year
INFL	Manganese, total [as Mn]	DAILY MX	report only	all year
INFL	Thallium, total [as Tl]	DAILY MX	report only	all year
INFL	Thallium, total [as Tl]	DAILY MX	report only	all year
INFL	Nickel, total [as Ni]	DAILY MX	report only	all year
INFL	Nickel, total [as Ni]	DAILY MX	report only	all year
INFL	Silver, total [as Ag]	DAILY MX	report only	all year
INFL	Silver, total [as Ag]	DAILY MX	report only	all year
INFL	Zinc, total [as Zn]	DAILY MX	report only	all year
INFL	Zinc, total [as Zn]	DAILY MX	report only	all year
INFL	Antimony, total [as Sb]	DAILY MX	report only	all year
INFL	Antimony, total [as Sb]	DAILY MX	report only	all year
INFL	Selenium, total [as Se]	DAILY MX	report only	all year
INFL	Selenium, total [as Se]	DAILY MX	report only	all year
INFL	Phenolics, total recoverable	DAILY MX	report only	all year
INFL	Phenolics, total recoverable	DAILY MX	report only	all year
INFL	Mercury, total [as Hg]	DAILY MX	report only	all year
INFL	Mercury, total [as Hg]	DAILY MX	report only	all year