City of Hillsboro — NPDES permit MO0129046: limits, due date and EPA's record

NPDES permit MO0129046 · Minor POTW · effective, expires 2028-03-31 · 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 (read off this permit's own late-day counts in EPA's filings).

Limits in force (22)

Outfall	Parameter	Statistic	Limit	Months
001	BOD, 5-day, 20 deg. C	WKLY AVG	<= 15 mg/L	all year
001	BOD, 5-day, 20 deg. C	MO AVG	<= 10 mg/L	all year
001	pH	MINIMUM	>= 6.5 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	WKLY AVG	<= 15 mg/L	all year
001	Solids, total suspended	MO AVG	<= 10 mg/L	all year
001	Oil and grease [soxhlet extr.] tot.	DAILY MX	report only	all year
001	Oil and grease [soxhlet extr.] tot.	MO AVG	report only	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 5.6 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1.7 mg/L	Apr, May, Jun, Jul, Aug, Sep
001	Nitrogen, ammonia total [as N]	MO AVG	<= 2.1 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= .6 mg/L	Apr, May, Jun, Jul, Aug, Sep
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	E. coli	7 DA GEO	<= 1030 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
001	E. coli	30DA GM	<= 206 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
001	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	report only	all year
001	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	all year
001	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
001	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year