MSU AGCENTER AND HORSE PARK — NPDES permit MS0053121: limits, due date and EPA's record

NPDES permit MS0053121 · Minor NON-POTW · expired, expires 2024-12-31 · EPA's file as of 2026-09-19

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2024-12-31 and is expired: 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

Last period with anything received: 2025-12-31. Most often over: Chlorine, total residual (2).

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 (20)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen, dissolved [DO]	MINIMUM	>= 6 mg/L	all year
001	BOD, 5-day, 20 deg. C	MX MO AV	<= 12 mg/L	all year
001	BOD, 5-day, 20 deg. C	DAILY MX	<= 18 mg/L	all year
001	BOD, 5-day, 20 deg. C	MX MO AV	<= 3.75 lb/d	all year
001	BOD, 5-day, 20 deg. C	DAILY MX	<= 5.63 lb/d	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	MX MO AV	<= 60 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 60 mg/L	all year
001	Solids, total suspended	MX MO AV	<= 19 lb/d	all year
001	Solids, total suspended	DAILY MX	<= 19 lb/d	all year
001	Nitrogen, ammonia total [as N]	MX MO AV	<= 2 mg/L	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	all year
001	Nitrogen, ammonia total [as N]	MX MO AV	<= .62 lb/d	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	<= .94 lb/d	all year
001	Flow, in conduit or thru treatment plant	MX MO AV	<= .0375 MGD	all year
001	Chlorine, total residual	MX MO AV	<= .011 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= .019 mg/L	all year
001	E. coli	MX MO AV	<= 126 #/100mL	all year
001	E. coli	DAILY MX	<= 410 #/100mL	all year