Associated Electric Cooperative, Inc. — NPDES permit MO0121827: limits, due date and EPA's record

NPDES permit MO0121827 · Major NON-POTW · effective, expires 2030-07-31 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (5).

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 (118)

Outfall	Parameter	Statistic	Limit	Months
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Zinc, total recoverable	DAILY MX	<= 1000 ug/L	all year
001	Zinc, total recoverable	MO AVG	<= 1000 ug/L	all year
001	Chromium, total recoverable	DAILY MX	<= 200 ug/L	all year
001	Chromium, total recoverable	MO AVG	<= 200 ug/L	all year
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	Chlorine, free available	DAILY MX	<= 500 ug/L	all year
001	Chlorine, free available	MO AVG	<= 200 ug/L	all year
003	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
003	Temperature, water deg. fahrenheit	MO AVG	<= 90 deg F	all year
003	pH	MINIMUM	>= 6.5 SU	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
003	Solids, total suspended	MO AVG	<= 30 mg/L	all year
003	Oil and grease [soxhlet extr.] tot.	DAILY MX	<= 15 mg/L	all year
003	Oil and grease [soxhlet extr.] tot.	MO AVG	<= 10 mg/L	all year
003	Nitrogen, total [as N]	DAILY MX	report only	all year
003	Nitrogen, total [as N]	MO AVG	report only	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
003	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
003	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
003	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
003	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
003	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
003	Phosphorus, total [as P]	DAILY MX	report only	all year
003	Phosphorus, total [as P]	MO AVG	report only	all year
003	Sulfate, total [as SO4]	DAILY MX	report only	all year
003	Sulfate, total [as SO4]	MO AVG	report only	all year
003	Boron, total recoverable	DAILY MX	<= 3285 ug/L	all year
003	Boron, total recoverable	MO AVG	<= 1638 ug/L	all year
003	Chloride	DAILY MX	report only	all year
003	Chloride	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Chlorine, total residual	DAILY MX	<= 17 ug/L	all year
003	Chlorine, total residual	MO AVG	<= 8 ug/L	all year
003	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	<= 1.6 toxic	all year
003	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1.6 toxic	all year
003	Chlorides + Sulfates	DAILY MX	report only	all year
003	Chlorides + Sulfates	MO AVG	report only	all year
005	pH	MINIMUM	>= 6 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	Zinc, total recoverable	DAILY MX	<= 1000 ug/L	all year
005	Zinc, total recoverable	MO AVG	<= 1000 ug/L	all year
005	Chromium, total recoverable	DAILY MX	<= 200 ug/L	all year
005	Chromium, total recoverable	MO AVG	<= 200 ug/L	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
005	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
005	Chlorine, free available	DAILY MX	<= 500 ug/L	all year
005	Chlorine, free available	MO AVG	<= 200 ug/L	all year
007	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
007	Temperature, water deg. fahrenheit	MO AVG	<= 90 deg F	all year
007	pH	MINIMUM	>= 6.5 SU	all year
007	pH	MAXIMUM	<= 9 SU	all year
007	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
007	Solids, total suspended	MO AVG	<= 30 mg/L	all year
007	Oil and grease [soxhlet extr.] tot.	DAILY MX	<= 15 mg/L	all year
007	Oil and grease [soxhlet extr.] tot.	MO AVG	<= 10 mg/L	all year
007	Nitrogen, total [as N]	DAILY MX	report only	all year
007	Nitrogen, total [as N]	MO AVG	report only	all year
007	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
007	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
007	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
007	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
007	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
007	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
007	Phosphorus, total [as P]	DAILY MX	report only	all year
007	Phosphorus, total [as P]	MO AVG	report only	all year
007	Sulfate, total [as SO4]	DAILY MX	report only	all year
007	Sulfate, total [as SO4]	MO AVG	report only	all year
007	Boron, total recoverable	DAILY MX	<= 3285 ug/L	all year
007	Boron, total recoverable	MO AVG	<= 1638 ug/L	all year
007	Chloride	DAILY MX	report only	all year
007	Chloride	MO AVG	report only	all year
007	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
007	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
007	Chlorine, total residual	DAILY MX	<= 17 ug/L	all year
007	Chlorine, total residual	MO AVG	<= 8 ug/L	all year
007	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	<= 1.6 toxic	all year
007	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1.6 toxic	all year
007	Chlorides + Sulfates	DAILY MX	report only	all year
007	Chlorides + Sulfates	MO AVG	report only	all year
008	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
008	Temperature, water deg. fahrenheit	MO AVG	<= 90 deg F	all year
008	pH	MINIMUM	>= 6.5 SU	all year
008	pH	MAXIMUM	<= 9 SU	all year
008	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
008	Solids, total suspended	MO AVG	<= 30 mg/L	all year
008	Oil and grease [soxhlet extr.] tot.	DAILY MX	<= 15 mg/L	all year
008	Oil and grease [soxhlet extr.] tot.	MO AVG	<= 10 mg/L	all year
008	Nitrogen, total [as N]	DAILY MX	report only	all year
008	Nitrogen, total [as N]	MO AVG	report only	all year
008	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.75 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
008	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.25 mg/L	Apr, May, Jun, Jul, Aug, Sep
008	Nitrogen, ammonia total [as N]	MO AVG	<= 2.5 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
008	Nitrogen, ammonia total [as N]	MO AVG	<= 1.5 mg/L	Apr, May, Jun, Jul, Aug, Sep
008	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
008	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
008	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
008	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
008	Phosphorus, total [as P]	DAILY MX	report only	all year
008	Phosphorus, total [as P]	MO AVG	report only	all year
008	Sulfate, total [as SO4]	DAILY MX	report only	all year
008	Sulfate, total [as SO4]	MO AVG	report only	all year
008	Boron, total recoverable	DAILY MX	<= 117.04 mg/L	all year
008	Boron, total recoverable	MO AVG	<= 58.37 mg/L	all year
008	Chloride	DAILY MX	<= 3130 mg/L	all year
008	Chloride	MO AVG	<= 1565 mg/L	all year
008	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
008	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
008	Chlorine, total residual	DAILY MX	<= 75 ug/L	all year
008	Chlorine, total residual	MO AVG	<= 50 ug/L	all year
008	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	report only	all year
008	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	all year
008	Chlorides + Sulfates	DAILY MX	<= 4462 mg/L	all year
008	Chlorides + Sulfates	MO AVG	<= 2224 mg/L	all year