DIXON, CITY OF — NPDES permit IL0026450: limits, due date and EPA's record

NPDES permit IL0026450 · Major POTW · effective, expires 2026-12-31 · 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 (read off this permit's own late-day counts in EPA's filings).

Limits in force (75)

Outfall	Parameter	Statistic	Limit	Months
002	Oxygen, dissolved [DO]	MO AV MN	>= 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
002	Oxygen, dissolved [DO]	MN WK AV	>= 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
002	Oxygen, dissolved [DO]	MN WK AV	>= 6 mg/L	Mar, Apr, May, Jun, Jul
002	Oxygen, dissolved [DO]	DAILY MN	>= 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec
002	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	Mar, Apr, May, Jun, Jul
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	MO AVG	<= 25 mg/L	all year
002	Solids, total suspended	WKLY AVG	<= 45 mg/L	all year
002	Solids, total suspended	MO AVG	<= 3273 lb/d	all year
002	Solids, total suspended	WKLY AVG	<= 5892 lb/d	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Mar, Apr, May, Sep, Oct
002	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Mar, Apr, May, Sep, Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Jan, Feb, Nov, Dec
002	Nitrogen, ammonia total [as N]	MO AVG	<= 196 lb/d	Mar, Apr, May, Sep, Oct
002	Nitrogen, ammonia total [as N]	MO AVG	<= 196 lb/d	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 354 lb/d	Mar, Apr, May, Sep, Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 354 lb/d	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 354 lb/d	Jan, Feb, Nov, Dec
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	DAILY MX	<= .038 mg/L	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Coliform, fecal general	DAILY MX	<= 400 #/100mL	May, Jun, Jul, Aug, Sep, Oct
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 20 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 40 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 2619 lb/d	all year
002	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 5238 lb/d	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