City of Underwood — NPDES permit IA0036986: limits, due date and EPA's record

NPDES permit IA0036986 · Minor POTW · effective, expires 2029-11-30 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-07-31. Most often over: BOD, carbonaceous [5 day, 20 C] (19), E. coli (1), pH (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (129)

Outfall	Parameter	Statistic	Limit	Months
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	<= 80 mg/L	all year
001	Solids, total suspended	7 DA AVG	<= 120 mg/L	all year
001	Solids, total suspended	30DA AVG	<= 109 lb/d	all year
001	Solids, total suspended	7 DA AVG	<= 164 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, ammonia total [as N]	30DA AVG	<= 42.4 mg/L	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 29.5 mg/L	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 73.9 mg/L	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 18.3 mg/L	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 19.6 mg/L	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 53.2 mg/L	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 96.9 mg/L	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 85.2 mg/L	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 24.7 mg/L	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.9 mg/L	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 63.1 mg/L	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 15.8 mg/L	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 86.8 mg/L	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 73 mg/L	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 106.4 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 80.4 mg/L	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 67.7 mg/L	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 71.2 mg/L	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 156.5 mg/L	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 144.4 mg/L	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 71.6 mg/L	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 63.4 mg/L	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 87.9 mg/L	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 71.6 mg/L	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 41.1 lb/d	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 28.7 lb/d	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 71.6 lb/d	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.9 lb/d	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 18.9 lb/d	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 51.6 lb/d	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 93.8 lb/d	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 82.5 lb/d	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 24.1 lb/d	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.3 lb/d	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 61.2 lb/d	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 15.5 lb/d	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 83.2 lb/d	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 70.8 lb/d	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 102.2 lb/d	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 74.8 lb/d	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 62.8 lb/d	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 68.3 lb/d	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 151.4 lb/d	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 145.1 lb/d	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 69 lb/d	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 60.9 lb/d	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 84.6 lb/d	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 69 lb/d	Jun
001	E. coli	GEO MEAN	<= 630 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
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	<= 34 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 55 lb/d	all year
001	Report due [yrmoda]	DAILY MX	<= 1 N=0;Y=1	all year
003	pH	DAILY MN	>= 6 SU	all year
003	pH	DAILY MX	<= 9 SU	all year
003	Solids, total suspended	30DA AVG	<= 80 mg/L	all year
003	Solids, total suspended	7 DA AVG	<= 120 mg/L	all year
003	Solids, total suspended	30DA AVG	<= 109 lb/d	all year
003	Solids, total suspended	7 DA AVG	<= 164 lb/d	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 6.4 mg/L	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 6.6 mg/L	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.1 mg/L	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 12.3 mg/L	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 6.1 mg/L	Dec
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.4 mg/L	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.2 mg/L	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 23.2 mg/L	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.9 mg/L	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5 mg/L	Jun
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5 mg/L	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.9 mg/L	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.4 mg/L	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.6 mg/L	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.1 mg/L	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.3 mg/L	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.1 mg/L	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.4 mg/L	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.2 mg/L	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 23.2 mg/L	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5 mg/L	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5 mg/L	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.9 mg/L	Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.1 lb/d	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.9 lb/d	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.8 lb/d	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 15.1 lb/d	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.4 lb/d	Dec
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.3 lb/d	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.1 lb/d	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 25.9 lb/d	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.7 lb/d	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.3 lb/d	Jun
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 6 lb/d	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.7 lb/d	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 8.1 lb/d	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.9 lb/d	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6.2 lb/d	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.1 lb/d	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.4 lb/d	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.3 lb/d	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.1 lb/d	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 30.4 lb/d	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.7 lb/d	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6 lb/d	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 6 lb/d	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.7 lb/d	Oct
003	E. coli	GEO MEAN	<= 630 #/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	<= 34 lb/d	all year
003	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 55 lb/d	all year