CITY OF WEBSTER CITY — NPDES permit IA0036625: limits, due date and EPA's record

NPDES permit IA0036625 · Major POTW · effective, expires 2026-09-30 · 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: Copper, total [as Cu] (4), Solids, total suspended (2), Chlorine, total residual (1).

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 (182)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	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	>= 6.5 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	<= 826 lb/d	all year
001	Solids, total suspended	7 DA AVG	<= 1238 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	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, 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	<= 1.1 mg/L	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.6 mg/L	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1 mg/L	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.4 mg/L	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1 mg/L	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.3 mg/L	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.4 mg/L	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.3 mg/L	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.5 mg/L	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 4 mg/L	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.7 mg/L	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.5 mg/L	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.7 mg/L	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.6 mg/L	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.2 mg/L	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.2 mg/L	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.7 mg/L	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.7 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.7 mg/L	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.4 mg/L	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 16 mg/L	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.2 mg/L	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.2 mg/L	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 29 lb/d	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 43 lb/d	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 28 lb/d	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 94 lb/d	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 26 lb/d	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 64 lb/d	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 94 lb/d	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 42 lb/d	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 36 lb/d	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 68 lb/d	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 109 lb/d	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 48 lb/d	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 454 lb/d	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 432 lb/d	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 484 lb/d	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 418 lb/d	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 447 lb/d	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 404 lb/d	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 404 lb/d	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 432 lb/d	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 397 lb/d	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 439 lb/d	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 391 lb/d	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 418 lb/d	May
001	Nitrogen, nitrate total [as N]	30DA AVG	<= 760 lb/d	all year
001	Nitrogen, nitrate total [as N]	DAILY MX	<= 1244 lb/d	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	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	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	Cadmium, total [as Cd]	30DA AVG	<= .0004523 mg/L	all year
001	Cadmium, total [as Cd]	DAILY MX	<= .004316 mg/L	all year
001	Cadmium, total [as Cd]	30DA AVG	<= .01245 lb/d	all year
001	Cadmium, total [as Cd]	DAILY MX	<= .1188 lb/d	all year
001	Copper, total [as Cu]	30DA AVG	<= .01687 mg/L	all year
001	Copper, total [as Cu]	DAILY MX	<= .0269 mg/L	all year
001	Copper, total [as Cu]	30DA AVG	<= .4642 lb/d	all year
001	Copper, total [as Cu]	DAILY MX	<= .7403 lb/d	all year
001	Chlorine, total residual	30DA AVG	<= .008 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= .019 mg/L	all year
001	Chlorine, total residual	30DA AVG	<= .216 lb/d	all year
001	Chlorine, total residual	DAILY MX	<= .523 lb/d	all year
001	E. coli	GEO MEAN	<= 630 #/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	<= 688 lb/d	all year
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1101 lb/d	all year
003	Oxygen, dissolved [DO]	DAILY MN	>= 4.3 mg/L	all year
003	pH	DAILY MN	>= 6.5 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	<= 826 lb/d	all year
003	Solids, total suspended	7 DA AVG	<= 1238 lb/d	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 9.4 mg/L	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.5 mg/L	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.2 mg/L	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.2 mg/L	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 2 mg/L	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.9 mg/L	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.2 mg/L	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.7 mg/L	Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.6 mg/L	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.2 mg/L	Jun
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.9 mg/L	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.2 mg/L	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.5 mg/L	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.1 mg/L	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.3 mg/L	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.2 mg/L	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.9 mg/L	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.4 mg/L	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.8 mg/L	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.4 mg/L	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15.2 mg/L	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 16.6 mg/L	Dec
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 246 lb/d	Feb
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 66 lb/d	Sep
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 214 lb/d	Jan
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 95 lb/d	Apr
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 58 lb/d	Jul
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 53 lb/d	Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 128 lb/d	Mar
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 86 lb/d	May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 97 lb/d	Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 146 lb/d	Nov
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 59 lb/d	Jun
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 155 lb/d	Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 403 lb/d	Feb
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 215 lb/d	Sep
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 429 lb/d	Jan
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 439 lb/d	Apr
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 179 lb/d	Jul
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 184 lb/d	Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 413 lb/d	Mar
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 359 lb/d	May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 418 lb/d	Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 411 lb/d	Nov
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 234 lb/d	Jun
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 448 lb/d	Dec
003	Nitrogen, nitrate total [as N]	30DA AVG	<= 760 lb/d	all year
003	Nitrogen, nitrate total [as N]	DAILY MX	<= 1244 lb/d	all year
003	Cadmium, total [as Cd]	30DA AVG	<= .0006277 mg/L	all year
003	Cadmium, total [as Cd]	DAILY MX	<= .004474 mg/L	all year
003	Cadmium, total [as Cd]	30DA AVG	<= .01464 lb/d	all year
003	Cadmium, total [as Cd]	DAILY MX	<= .1208 lb/d	all year
003	Copper, total [as Cu]	30DA AVG	<= .02177 mg/L	all year
003	Copper, total [as Cu]	DAILY MX	<= .02773 mg/L	all year
003	Copper, total [as Cu]	30DA AVG	<= .5256 lb/d	all year
003	Copper, total [as Cu]	DAILY MX	<= .7507 lb/d	all year
003	Chlorine, total residual	30DA AVG	<= .012 mg/L	all year
003	Chlorine, total residual	DAILY MX	<= .02 mg/L	all year
003	Chlorine, total residual	30DA AVG	<= .274 lb/d	all year
003	Chlorine, total residual	DAILY MX	<= .536 lb/d	all year
003	E. coli	GEO MEAN	<= 126 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
003	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	<= 1 N=0;Y=1	all year
003	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1 N=0;Y=1	all year
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	<= 688 lb/d	all year
003	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1101 lb/d	all year