Chester Sanitary District — NPDES permit SD0020338: limits, due date and EPA's record

NPDES permit SD0020338 · Minor POTW · effective, expires 2027-01-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among SD permits in EPA's filings — check your permit).

Limits in force (26)

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 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	<= 2.9 mg/L	Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Jan, Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Nov, Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.6 mg/L	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1 mg/L	Apr, May, Jun, Jul, Aug, Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 7.2 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.5 mg/L	Jan, Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.5 mg/L	Nov, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4.8 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.1 mg/L	Apr, May, Jun, Jul, Aug, Sep
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	Duration of discharge	MO TOTAL	report only	all year