CHS INC — NPDES permit MT0000264: limits, due date and EPA's record

NPDES permit MT0000264 · Major NON-POTW · effective, expires 2027-10-31 · 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: Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas (3), Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia (2).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MT permits in EPA's filings — check your permit).

Limits in force (174)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	MO AVG	report only	all year
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	Temperature, water deg. centigrade	MO AVG	report only	all year
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	Flow rate	MO AVG	report only	all year
002	Flow rate	DAILY MX	report only	all year
002	Conductivity	MO AVG	report only	all year
002	Conductivity	DAILY MX	report only	all year
002	Alpha emitting radium isotopes, dissolved	VALUE	report only	all year
002	Alpha emitting radium isotopes, dissolved	MO AVG	report only	all year
002	Alpha emitting radium isotopes, dissolved	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	MO AVG	<= 331 lb/d	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	<= 620 lb/d	all year
002	pH	DAILY MN	>= 6 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	pH	MINIMUM	report only	all year
002	pH	MAXIMUM	report only	all year
002	Solids, total suspended	MO AVG	<= 339 lb/d	all year
002	Solids, total suspended	DAILY MX	<= 532 lb/d	all year
002	Oil and grease, hexane extr method	MO AVG	report only	all year
002	Oil and grease, hexane extr method	DAILY MX	<= 10 mg/L	all year
002	Oil and grease, hexane extr method	MO AVG	<= 128 lb/d	all year
002	Oil and grease, hexane extr method	DAILY MX	<= 242 lb/d	all year
002	Nitrogen, total [as N]	MO AVG	report only	Aug, Sep, Oct
002	Nitrogen, total [as N]	MO AVG	report only	Aug, Sep, Oct
002	Nitrogen, total [as N]	MO AVG	report only	Aug, Sep, Oct
002	Nitrogen, total [as N]	DAILY MX	report only	Aug, Sep, Oct
002	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	MO AVG	<= 191 lb/d	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 418 lb/d	all year
002	Nitrite + Nitrate total [as N]	MO AVG	report only	Aug, Sep, Oct
002	Nitrite + Nitrate total [as N]	MO AVG	report only	Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	Aug, Sep, Oct
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
002	Phosphorus, total [as P]	MO AVG	report only	Aug, Sep, Oct
002	Phosphorus, total [as P]	MO AVG	report only	Aug, Sep, Oct
002	Phosphorus, total [as P]	MO AVG	report only	Aug, Sep, Oct
002	Phosphorus, total [as P]	DAILY MX	report only	Aug, Sep, Oct
002	Sulfide, total [as S]	MO AVG	report only	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Sulfide, total [as S]	MO AVG	<= 1.8 lb/d	all year
002	Sulfide, total [as S]	DAILY MX	<= 3.9 lb/d	all year
002	Sulfide, dissolved, [as S]	MO AVG	report only (alert)	all year
002	Sulfide, dissolved, [as S]	DAILY MX	report only (alert)	all year
002	Sulfide, dissolved, [as S]	MO AVG	report only	all year
002	Sulfide, dissolved, [as S]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	MO AVG	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Fluoride	VALUE	report only	all year
002	Arsenic, total recoverable	MO AVG	<= 13 ug/L	all year
002	Arsenic, total recoverable	DAILY MX	<= 19 ug/L	all year
002	Iron, total recoverable	VALUE	report only	all year
002	Iron, total recoverable	MO AVG	report only	all year
002	Iron, total recoverable	DAILY MX	report only	all year
002	Selenium, total recoverable	VALUE	report only	all year
002	Selenium, total recoverable	MO AVG	report only	all year
002	Selenium, total recoverable	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	MO AVG	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	MO AVG	<= .36 lb/d	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	<= .99 lb/d	all year
002	Aluminum, dissolved [as Al]	VALUE	report only	all year
002	Aluminum, dissolved [as Al]	MO AVG	report only	all year
002	Aluminum, dissolved [as Al]	DAILY MX	report only	all year
002	Lead, total recoverable	VALUE	report only	all year
002	Lead, total recoverable	MO AVG	report only	all year
002	Lead, total recoverable	DAILY MX	report only	all year
002	Chromium, total recoverable	MO AVG	report only	all year
002	Chromium, total recoverable	DAILY MX	report only	all year
002	Chromium, total recoverable	MO AVG	<= 5.2 lb/d	all year
002	Chromium, total recoverable	DAILY MX	<= 9.1 lb/d	all year
002	Cyanide [A]	VALUE	report only	all year
002	Cyanide [A]	MO AVG	report only	all year
002	Cyanide [A]	DAILY MX	report only	all year
002	Radium 228, total	VALUE	report only	all year
002	Radium 228, total	MO AVG	report only	all year
002	Radium 228, total	DAILY MX	report only	all year
002	Phenol	MO AVG	report only	all year
002	Phenol	DAILY MX	report only	all year
002	Phenol	MO AVG	<= 2.2 lb/d	all year
002	Phenol	DAILY MX	<= 4.5 lb/d	all year
002	Nitrogen, total Kjeldahl	MO AVG	report only	Aug, Sep, Oct
002	Chlorine, total residual	MO AVG	report only	all year
002	Chlorine, total residual	DAILY MX	report only	all year
002	Beta/photon emitters	VALUE	report only	all year
002	Beta/photon emitters	MO AVG	report only	all year
002	Beta/photon emitters	DAILY MX	report only	all year
002	Solids, total dissolved	MO AVG	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Hydrogen sulfide	MO AVG	<= 19.999 ug/L	all year
002	Hydrogen sulfide	DAILY MX	<= 19.999 ug/L	all year
002	Hydrogen sulfide	MO AVG	report only	all year
002	Hydrogen sulfide	DAILY MX	report only	all year
002	Mercury, total recoverable	VALUE	report only	all year
002	Mercury, total recoverable	MO AVG	report only	all year
002	Mercury, total recoverable	DAILY MX	report only	all year
002	Chemical Oxygen Demand [COD]	MO AVG	report only	all year
002	Chemical Oxygen Demand [COD]	DAILY MX	report only	all year
002	Chemical Oxygen Demand [COD]	MO AVG	<= 2288 lb/d	all year
002	Chemical Oxygen Demand [COD]	DAILY MX	<= 4425 lb/d	all year
002	Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia	VALUE	<= 0 pass=0;fail=1	all year
002	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	VALUE	<= 0 pass=0;fail=1	all year
003	Temperature, water deg. centigrade	MO AVG	report only	all year
003	Temperature, water deg. centigrade	DAILY MX	report only	all year
003	Flow rate	MO AVG	report only	all year
003	Flow rate	DAILY MX	report only	all year
003	Alpha emitting radium isotopes, dissolved	VALUE	report only	all year
003	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
003	BOD, 5-day, 20 deg. C	MO AVG	<= 331 lb/d	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	<= 620 lb/d	all year
003	pH	DAILY MN	>= 6 SU	all year
003	pH	DAILY MX	<= 9 SU	all year
003	Solids, total suspended	MO AVG	<= 339 lb/d	all year
003	Solids, total suspended	DAILY MX	<= 532 lb/d	all year
003	Oil and grease, hexane extr method	MO AVG	report only	all year
003	Oil and grease, hexane extr method	DAILY MX	<= 10 mg/L	all year
003	Oil and grease, hexane extr method	MO AVG	<= 128 lb/d	all year
003	Oil and grease, hexane extr method	DAILY MX	<= 242 lb/d	all year
003	Nitrogen, total [as N]	MO AVG	report only	Aug, Sep, Oct
003	Nitrogen, total [as N]	MO AVG	report only	Aug, Sep, Oct
003	Nitrogen, ammonia 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	<= 191 lb/d	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 418 lb/d	all year
003	Nitrite + Nitrate total [as N]	MO AVG	report only	Aug, Sep, Oct
003	Nitrite + Nitrate total [as N]	MO AVG	report only	Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
003	Nitrite + Nitrate total [as N]	DAILY MX	report only	Aug, Sep, Oct
003	Nitrite + Nitrate total [as N]	DAILY MX	report only	Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
003	Phosphorus, total [as P]	MO AVG	report only	Aug, Sep, Oct
003	Phosphorus, total [as P]	MO AVG	report only	Aug, Sep, Oct
003	Sulfide, total [as S]	MO AVG	report only	all year
003	Sulfide, total [as S]	DAILY MX	report only	all year
003	Sulfide, total [as S]	MO AVG	<= 1.8 lb/d	all year
003	Sulfide, total [as S]	DAILY MX	<= 3.9 lb/d	all year
003	Sulfide, dissolved, [as S]	MO AVG	report only	all year
003	Sulfide, dissolved, [as S]	DAILY MX	report only	all year
003	Fluoride	VALUE	report only	all year
003	Arsenic, total recoverable	MO AVG	<= 13 ug/L	all year
003	Arsenic, total recoverable	DAILY MX	<= 19 ug/L	all year
003	Iron, total recoverable	VALUE	report only	all year
003	Selenium, total recoverable	VALUE	report only	all year
003	Chromium, hexavalent [as Cr]	MO AVG	report only	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
003	Chromium, hexavalent [as Cr]	MO AVG	<= .36 lb/d	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	<= 1 lb/d	all year
003	Aluminum, dissolved [as Al]	VALUE	report only	all year
003	Lead, total recoverable	VALUE	report only	all year
003	Chromium, total recoverable	MO AVG	report only	all year
003	Chromium, total recoverable	DAILY MX	report only	all year
003	Chromium, total recoverable	MO AVG	<= 5.2 lb/d	all year
003	Chromium, total recoverable	DAILY MX	<= 9.1 lb/d	all year
003	Cyanide [A]	VALUE	report only	all year
003	Radium 228, total	VALUE	report only	all year
003	Phenol	MO AVG	report only	all year
003	Phenol	DAILY MX	report only	all year
003	Phenol	MO AVG	<= 2.2 lb/d	all year
003	Phenol	DAILY MX	<= 4.5 lb/d	all year
003	Nitrogen, total Kjeldahl	MO AVG	report only	Aug, Sep, Oct
003	Chlorine, total residual	MO AVG	<= 170 ug/L	all year
003	Chlorine, total residual	DAILY MX	<= 400 ug/L	all year
003	Beta/photon emitters	VALUE	report only	all year
003	Hydrogen sulfide	MO AVG	<= 19.999 ug/L	all year
003	Hydrogen sulfide	DAILY MX	<= 19.999 ug/L	all year
003	Mercury, total recoverable	VALUE	report only	all year
003	Chemical Oxygen Demand [COD]	MO AVG	report only	all year
003	Chemical Oxygen Demand [COD]	DAILY MX	report only	all year
003	Chemical Oxygen Demand [COD]	MO AVG	<= 2288 lb/d	all year
003	Chemical Oxygen Demand [COD]	DAILY MX	<= 4425 lb/d	all year
003	Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia	VALUE	<= 0 pass=0;fail=1	all year
003	Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	VALUE	<= 0 pass=0;fail=1	all year