City of Union — NPDES permit MO0025283: limits, due date and EPA's record

NPDES permit MO0025283 · Major 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 (60)

Outfall	Parameter	Statistic	Limit	Months
002	BOD, 5-day, 20 deg. C	WKLY AVG	<= 45 mg/L	all year
002	BOD, 5-day, 20 deg. C	MO AVG	<= 30 mg/L	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	WKLY AVG	<= 45 mg/L	all year
002	Solids, total suspended	MO AVG	<= 30 mg/L	all year
002	Oil and grease [soxhlet extr.] tot.	DAILY MX	<= 15 mg/L	all year
002	Oil and grease [soxhlet extr.] tot.	MO AVG	<= 10 mg/L	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.3 mg/L	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Jan, Nov, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 12.3 mg/L	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.7 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 14.8 mg/L	Jun
002	Nitrogen, ammonia total [as N]	MO AVG	<= 11.5 mg/L	Oct
002	Nitrogen, ammonia total [as N]	MO AVG	<= 5.9 mg/L	Aug
002	Nitrogen, ammonia total [as N]	MO AVG	<= 14.4 mg/L	Jan, Nov, Dec
002	Nitrogen, ammonia total [as N]	MO AVG	<= 8.1 mg/L	Sep
002	Nitrogen, ammonia total [as N]	MO AVG	<= 12.3 mg/L	Feb
002	Nitrogen, ammonia total [as N]	MO AVG	<= 6.7 mg/L	Jul
002	Nitrogen, ammonia total [as N]	MO AVG	<= 14.3 mg/L	Mar
002	Nitrogen, ammonia total [as N]	MO AVG	<= 12.5 mg/L	Apr
002	Nitrogen, ammonia total [as N]	MO AVG	<= 10.2 mg/L	May
002	Nitrogen, ammonia total [as N]	MO AVG	<= 7.9 mg/L	Jun
002	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
002	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
002	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	MO AVG	report only	all year
002	Zinc, total recoverable	DAILY MX	report only	all year
002	Zinc, total recoverable	MO AVG	report only	all year
002	Copper, total recoverable	DAILY MX	report only	all year
002	Copper, total recoverable	MO AVG	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	DAILY MX	<= 19.9 ug/L	all year
002	Chromium, hexavalent dissolved [as Cr]	MO AVG	<= 9.2 ug/L	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	E. coli	7 DA GEO	<= 630 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	E. coli	30DA GM	<= 126 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	report only	all year
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	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
INF	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
INF	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
INF	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
INF	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
INF	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
INF	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
INF	Phosphorus, total [as P]	DAILY MX	report only	all year
INF	Phosphorus, total [as P]	MO AVG	report only	all year
SM2	Hardness, total [as CaCO3]	DAILY MX	report only	all year
SM2	Hardness, total [as CaCO3]	MO AVG	report only	all year