Keystone, Town of — NPDES permit SD0024007: limits, due date and EPA's record

NPDES permit SD0024007 · Minor POTW · administratively continued, expires 2025-06-30 · EPA's file as of 2026-09-19

This permit expired on 2025-06-30 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 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (29)

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	<= 10 mg/L	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	<= 17.5 mg/L	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
002	pH	DAILY MN	>= 6.6 SU	all year
002	pH	DAILY MX	<= 8.6 SU	all year
002	Solids, total suspended	30DA AVG	<= 10 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 17.5 mg/L	all year
002	Solids, total suspended	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	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.9 lb/d	Jan, Feb, Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.3 lb/d	Apr, May, Jun
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.3 lb/d	Jul, Aug, Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.3 lb/d	Oct, Nov, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.9 lb/d	Jan, Feb, Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.6 lb/d	Apr, May, Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.2 lb/d	Jul, Aug, Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.4 lb/d	Oct, Nov, Dec
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	E. coli, colony forming units [CFU]	30DA GEO	<= 630 CFU/100mL	May, Jun, Jul, Aug, Sep
002	E. coli, colony forming units [CFU]	DAILY MX	<= 1178 CFU/100mL	May, Jun, Jul, Aug, Sep
002	Flow, total	MO TOTAL	report only	all year
002	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
002	Solids, suspended percent removal	MO AV MN	>= 85 %	all year