CITY OF WALCOTT — NPDES permit IA0061891: limits, due date and EPA's record

NPDES permit IA0061891 · Major POTW · administratively continued, expires 2024-11-30 · EPA's file as of 2026-09-19

This permit expired on 2024-11-30 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 (read off this permit's own late-day counts in EPA's filings).

Limits in force (96)

Outfall	Parameter	Statistic	Limit	Months
002	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
002	pH	DAILY MN	>= 6.5 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	pH	30DA AVG	report only	all year
002	pH	DAILY MX	report only	all year
002	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	7 DA AVG	<= 45 mg/L	all year
002	Solids, total suspended	30DA AVG	<= 327 lb/d	all year
002	Solids, total suspended	7 DA AVG	<= 491 lb/d	all year
002	Solids, total suspended	30DA AVG	report only	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Solids, total suspended	30DA AVG	report only	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Nitrogen, total [as N]	30DA AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, total [as N]	30DA AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, total [as N]	30DA AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, total [as N]	30DA AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 4 mg/L	Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.3 mg/L	Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.7 mg/L	May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.4 mg/L	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1 mg/L	Jul
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Apr
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1 mg/L	Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.1 mg/L	Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.6 mg/L	Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.4 mg/L	Jan
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.5 mg/L	Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.3 mg/L	Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 9 mg/L	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 9 mg/L	Jan
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Jun
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 39 lb/d	Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.1 lb/d	Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.1 lb/d	May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.1 lb/d	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 11 lb/d	Jul
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 16.6 lb/d	Apr
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 10.4 lb/d	Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 11.5 lb/d	Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 lb/d	Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 37.1 lb/d	Jan
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17.1 lb/d	Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 14.3 lb/d	Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 39 lb/d	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.8 lb/d	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.8 lb/d	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 39 lb/d	Jan
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 17.1 lb/d	Jun
002	Nitrogen, Kjeldahl, total [as N]	30DA AVG	report only	all year
002	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
002	Nitrogen, Kjeldahl, total [as N]	30DA AVG	report only	all year
002	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	30DA AVG	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	30DA AVG	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	30DA AVG	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	30DA AVG	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Chloride [as Cl]	30DA AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Chloride [as Cl]	30DA AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	E. coli	GEO MEAN	<= 630 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
002	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	<= 1 N=0;Y=1	all year
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1 N=0;Y=1	all year
002	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 25 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 25 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 107 lb/d	all year
002	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 107 lb/d	all year