Ft. Pierre, City of — NPDES permit SD0023582: limits, due date and EPA's record

NPDES permit SD0023582 · Minor POTW · effective, expires 2027-06-30 · 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: Solids, total suspended (4), BOD, 5-day, 20 deg. C (3).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (28)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	30DA AVG	report only	all year
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	Flow rate	30DA AVG	report only	all year
002	Flow rate	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
002	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
002	pH	DAILY MN	>= 6.5 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	Solids, total suspended	30DA AVG	<= 90 mg/L	all year
002	Solids, total suspended	MX 7D AV	<= 135 mg/L	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.2 lb/d	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.5 lb/d	Jan, Feb, Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.6 lb/d	Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.2 lb/d	Mar, Apr, May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 20.5 lb/d	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 38.2 lb/d	Jan, Feb, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 23.9 lb/d	Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 31.4 lb/d	Mar, Apr, May
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	E. coli, colony forming units [CFU]	30DA GEO	<= 126 #/100mL	May, Jun, Jul, Aug, Sep
002	E. coli, colony forming units [CFU]	DAILY MX	<= 235 #/100mL	May, Jun, Jul, Aug, Sep
002	Flow, total	MO TOTAL	report only	all year
002	Coliform, total general	30DA GEO	<= 5000 #/100mL	all year
002	Coliform, total general	DAILY MX	<= 20000 #/100mL	all year
002	Duration of discharge	MO TOTAL	report only	all year