CITY OF CHARLES CITY — NPDES permit IA0022039: limits, due date and EPA's record

NPDES permit IA0022039 · Major POTW · administratively continued, expires 2026-05-31 · EPA's file as of 2026-09-19

This permit expired on 2026-05-31 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

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Limits in force (209)

Outfall	Parameter	Statistic	Limit	Months
001	Streamflow	30DA AVG	report only	all year
001	Streamflow	DAILY MX	report only	all year
001	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
001	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
001	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
001	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
001	pH	DAILY MN	>= 6 SU	all year
001	pH	DAILY MX	<= 9 SU	all year
001	pH	30DA AVG	report only	all year
001	pH	DAILY MX	report only	all year
001	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
001	Solids, total suspended	7 DA AVG	<= 45 mg/L	all year
001	Solids, total suspended	30DA AVG	<= 1166 lb/d	all year
001	Solids, total suspended	7 DA AVG	<= 1749 lb/d	all year
001	Solids, total suspended	30DA AVG	report only	all year
001	Solids, total suspended	DAILY MX	report only	all year
001	Solids, total suspended	30DA AVG	report only	all year
001	Solids, total suspended	DAILY MX	report only	all year
001	Nitrogen, total [as N]	30DA AVG	<= 370.5 lb/d	all year
001	Nitrogen, total [as N]	DAILY MX	<= 606.5 lb/d	all year
001	Nitrogen, total [as N]	30DA AVG	report only	all year
001	Nitrogen, total [as N]	DAILY MX	report only	all year
001	Nitrogen, total [as N]	30DA AVG	report only	all year
001	Nitrogen, total [as N]	DAILY MX	report only	all year
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 22.2 mg/L	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 27.4 mg/L	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 29.4 mg/L	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 57.5 mg/L	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 19 mg/L	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 44.9 mg/L	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 27.4 mg/L	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 40 mg/L	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 33.7 mg/L	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 63.9 mg/L	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 16.6 mg/L	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.7 mg/L	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 79.4 mg/L	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 70.4 mg/L	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 80.4 mg/L	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 93.6 mg/L	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 71.7 mg/L	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 70.7 mg/L	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 70.3 mg/L	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 68.9 mg/L	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 91.8 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 107.5 mg/L	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 82 mg/L	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 84.1 mg/L	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 461.9 lb/d	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 576.3 lb/d	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 613.6 lb/d	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1196.3 lb/d	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 402 lb/d	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 950.5 lb/d	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 579.3 lb/d	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 834.2 lb/d	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 700.5 lb/d	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1319.9 lb/d	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 348.4 lb/d	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 373.5 lb/d	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1687.9 lb/d	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1518.9 lb/d	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1712.7 lb/d	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1976.6 lb/d	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1550 lb/d	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1526.8 lb/d	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1516.6 lb/d	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1480.3 lb/d	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1936.8 lb/d	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 2245.3 lb/d	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1753.8 lb/d	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1807.4 lb/d	Jul
001	Nitrogen, Kjeldahl, total [as N]	30DA AVG	report only	all year
001	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
001	Nitrogen, Kjeldahl, total [as N]	30DA AVG	report only	all year
001	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	30DA AVG	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	30DA AVG	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	E. coli	GEO MEAN	<= 126 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	<= 1 N=0;Y=1	all year
001	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1 N=0;Y=1	all year
001	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 25 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 40 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 972 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1555 lb/d	all year
003	pH	DAILY MN	>= 6 SU	all year
003	pH	DAILY MX	<= 9 SU	all year
003	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
003	Solids, total suspended	7 DA AVG	<= 45 mg/L	all year
003	Solids, total suspended	30DA AVG	<= 1166 lb/d	all year
003	Solids, total suspended	7 DA AVG	<= 1749 lb/d	all year
003	Nitrogen, total [as N]	30DA AVG	<= 370.5 lb/d	all year
003	Nitrogen, total [as N]	DAILY MX	<= 606.5 lb/d	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 24.5 mg/L	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 25.8 mg/L	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 18.8 mg/L	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 26.2 mg/L	Dec
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.8 mg/L	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 29.7 mg/L	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 26.7 mg/L	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 19.7 mg/L	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 27.8 mg/L	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 28.6 mg/L	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 25.8 mg/L	Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 24.6 mg/L	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 24.5 mg/L	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 25.8 mg/L	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 29.9 mg/L	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 26.2 mg/L	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 28.1 mg/L	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 29.7 mg/L	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 26.7 mg/L	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 26.9 mg/L	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 27.8 mg/L	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 28.6 mg/L	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 25.8 mg/L	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 25.8 mg/L	Jun
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 952.4 lb/d	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1003.3 lb/d	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 729.3 lb/d	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1016.8 lb/d	Dec
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 692 lb/d	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1153.5 lb/d	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1037.6 lb/d	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 767.5 lb/d	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1081.6 lb/d	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1112.6 lb/d	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 1004 lb/d	Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 954.3 lb/d	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 952.4 lb/d	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1003.3 lb/d	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1161.4 lb/d	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1016.8 lb/d	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1090.6 lb/d	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1153.5 lb/d	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1037.6 lb/d	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1045.2 lb/d	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1081.6 lb/d	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1112.6 lb/d	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1004 lb/d	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 1001.5 lb/d	Jun
003	E. coli	GEO MEAN	<= 126 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
003	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 25 mg/L	all year
003	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 40 mg/L	all year
003	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 972 lb/d	all year
003	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1555 lb/d	all year
004	pH	DAILY MN	>= 6 SU	all year
004	pH	DAILY MX	<= 9 SU	all year
004	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
004	Solids, total suspended	7 DA AVG	<= 45 mg/L	all year
004	Solids, total suspended	30DA AVG	<= 1166 lb/d	all year
004	Solids, total suspended	7 DA AVG	<= 1749 lb/d	all year
004	Nitrogen, total [as N]	30DA AVG	<= 370.5 lb/d	all year
004	Nitrogen, total [as N]	DAILY MX	<= 606.5 lb/d	all year
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 19.5 mg/L	Dec
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.3 mg/L	Jul
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.8 mg/L	Sep
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 10.9 mg/L	Jun
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 18 mg/L	Nov
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 19.1 mg/L	Feb
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 19.5 mg/L	Jan
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 12.6 mg/L	Apr
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.9 mg/L	Aug
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 16.8 mg/L	Mar
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 14.5 mg/L	May
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Oct
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19.5 mg/L	Dec
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 21.8 mg/L	Jul
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 20.1 mg/L	Sep
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 18.2 mg/L	Jun
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 18 mg/L	Nov
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19.1 mg/L	Feb
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19.5 mg/L	Jan
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19.2 mg/L	Apr
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 20.2 mg/L	Aug
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 18.9 mg/L	Mar
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19 mg/L	May
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19.2 mg/L	Oct
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 461.9 lb/d	Dec
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 186.4 lb/d	Jul
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 196.1 lb/d	Sep
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 243.7 lb/d	Jun
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 434.3 lb/d	Nov
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 650.8 lb/d	Feb
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 638.8 lb/d	Jan
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 282.7 lb/d	Apr
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 176.9 lb/d	Aug
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 377.3 lb/d	Mar
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 323.1 lb/d	May
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 290.2 lb/d	Oct
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 694.1 lb/d	Dec
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 771.5 lb/d	Jul
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 717 lb/d	Sep
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 638 lb/d	Jun
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 640 lb/d	Nov
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 650.8 lb/d	Feb
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 679.6 lb/d	Jan
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 683 lb/d	Apr
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 713.4 lb/d	Aug
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 657.6 lb/d	Mar
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 669.3 lb/d	May
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 683.1 lb/d	Oct
004	E. coli	GEO MEAN	<= 126 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
004	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 25 mg/L	all year
004	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 40 mg/L	all year
004	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 972 lb/d	all year
004	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1555 lb/d	all year