Otter Tail Power Company — NPDES permit ND0024996: limits, due date and EPA's record

NPDES permit ND0024996 · Minor NON-POTW · effective, expires 2028-03-31 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-06-30. Most often over: Chlorine, free available (1).

Reporting

Reports are due about 89 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (57)

Outfall	Parameter	Statistic	Limit	Months
003	pH	MINIMUM	>= 6 SU	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	Solids, total suspended	DAILY MN	report only	all year
003	Solids, total suspended	MO AVG	report only	all year
003	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Flow, total	TOTAL	report only	all year
005	pH	MINIMUM	>= 6.5 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	Nitrogen, total [as N]	DAILY MN	report only	all year
005	Nitrogen, total [as N]	MO AVG	report only	all year
005	Nitrogen, total [as N]	DAILY MX	report only	all year
005	Nitrogen, total [as N]	MO AVG	report only	all year
005	Nitrogen, total [as N]	DAILY MX	report only	all year
005	Phosphorus, total [as P]	DAILY MN	report only	all year
005	Phosphorus, total [as P]	MO AVG	report only	all year
005	Phosphorus, total [as P]	DAILY MX	report only	all year
005	Phosphorus, total [as P]	MO AVG	report only	all year
005	Phosphorus, total [as P]	DAILY MX	report only	all year
005	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
005	Chlorine, free available	DAILY MN	report only	all year
005	Chlorine, free available	DAILY AV	<= .2 mg/L	all year
005	Chlorine, free available	DAILY MX	<= .5 mg/L	all year
005	Chlorine, free available	30DA AVG	<= .04 lb/d	all year
005	Chlorine, free available	DAILY MX	<= .11 lb/d	all year
005	Flow, total	TOTAL	report only	all year
012	pH	MINIMUM	>= 6 SU (alert)	all year
012	pH	MAXIMUM	<= 9 SU (alert)	all year
012	Solids, total suspended	DAILY MN	report only (alert)	all year
012	Solids, total suspended	MO AVG	report only (alert)	all year
012	Solids, total suspended	DAILY MX	<= 100 mg/L (alert)	all year
012	Oil & Grease	DAILY MN	report only	all year
012	Oil & Grease	MO AVG	report only	all year
012	Oil & Grease	DAILY MX	<= 15 mg/L	all year
012	Chloride [as Cl]	DAILY MN	report only (alert)	all year
012	Chloride [as Cl]	MO AVG	report only (alert)	all year
012	Chloride [as Cl]	DAILY MX	<= 250 mg/L (alert)	all year
012	Sulfate, total [as SO4]	DAILY MN	report only (alert)	all year
012	Sulfate, total [as SO4]	MO AVG	report only (alert)	all year
012	Sulfate, total [as SO4]	DAILY MX	<= 750 mg/L (alert)	all year
012	Arsenic, total [as As]	DAILY MN	report only (alert)	all year
012	Arsenic, total [as As]	MO AVG	report only (alert)	all year
012	Arsenic, total [as As]	DAILY MX	<= .15 mg/L (alert)	all year
012	Boron, total [as B]	DAILY MN	report only (alert)	all year
012	Boron, total [as B]	MO AVG	report only (alert)	all year
012	Boron, total [as B]	DAILY MX	<= .15 mg/L (alert)	all year
012	Iron, total [as Fe]	DAILY MN	report only (alert)	all year
012	Iron, total [as Fe]	MO AVG	report only (alert)	all year
012	Iron, total [as Fe]	DAILY MX	<= 1 mg/L (alert)	all year
012	Flow, in conduit or thru treatment plant	MO AVG	report only (alert)	all year
012	Flow, in conduit or thru treatment plant	DAILY MX	report only (alert)	all year
012	Flow, total	TOTAL	report only (alert)	all year
012	Oil and grease visual	TOTAL	<= 0 N=0;Y=1 (alert)	all year
CWI	Flow, process wastewater	30DA AVG	report only	all year
CWI	Flow, process wastewater	DAILY MX	report only	all year