Agropur (Lake Norden Facility) — NPDES permit SD0025411: limits, due date and EPA's record

NPDES permit SD0025411 · Minor NON-POTW · effective, expires 2031-06-30 · 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: Conductivity (10), Alkalinity, total [as CaCO3] (10), Toxicity [acute], Pimephales promelas [Fathead Minnow] (2).

Reporting

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

Limits in force (82)

Outfall	Parameter	Statistic	Limit	Months
004	Temperature, water deg. fahrenheit	30DA AVG	report only	all year
004	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
004	Flow rate	30DA AVG	report only	all year
004	Flow rate	DAILY MX	report only	all year
004	Conductivity	30DA AVG	<= 4375 umho/cm	Apr, May, Jun, Jul, Aug, Sep, Oct
004	Conductivity	30DA AVG	<= 7000 umho/cm	Jan, Feb, Mar, Nov, Dec
004	Conductivity	DAILY MX	<= 4375 umho/cm	Apr, May, Jun, Jul, Aug, Sep, Oct
004	Conductivity	DAILY MX	<= 7000 umho/cm	Jan, Feb, Mar, Nov, Dec
004	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	all year
004	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
004	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
004	BOD, 5-day, 20 deg. C	30DA AVG	<= 269 lb/d	all year
004	BOD, 5-day, 20 deg. C	DAILY MX	<= 538 lb/d	all year
004	pH	DAILY MN	>= 6.5 SU	all year
004	pH	DAILY MX	<= 9 SU	all year
004	Alkalinity, total [as CaCO3]	30DA AVG	<= 1255 mg/L	all year
004	Alkalinity, total [as CaCO3]	DAILY MX	<= 1313 mg/L	all year
004	Solids, total suspended	30DA AVG	<= 90 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 158 mg/L	all year
004	Solids, total suspended	30DA AVG	<= 337 lb/d	all year
004	Solids, total suspended	DAILY MX	<= 670 lb/d	all year
004	Oil and grease, hexane extr method	DAILY MX	report only	all year
004	Oil and grease, hexane extr method	DAILY MX	report only	all year
004	Nitrogen, total [as N]	30DA AVG	report only	all year
004	Nitrogen, total [as N]	DAILY MX	report only	all year
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Mar
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.8 mg/L	Apr
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.6 mg/L	Nov
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.8 mg/L	May
004	Nitrogen, ammonia total [as N]	30DA AVG	<= .6 mg/L	Jul
004	Nitrogen, ammonia total [as N]	30DA AVG	<= .5 mg/L	Aug
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Dec
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.2 mg/L	Jan
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.4 mg/L	Jun
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Feb
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.5 mg/L	Oct
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.4 mg/L	Sep
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Mar
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.2 mg/L	Apr
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Nov
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.2 mg/L	May
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 1.1 mg/L	Jul
004	Nitrogen, ammonia total [as N]	DAILY MX	<= .8 mg/L	Aug
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Dec
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.1 mg/L	Jan
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.5 mg/L	Jun
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.5 mg/L	Feb
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.5 mg/L	Oct
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.4 mg/L	Sep
004	Nitrogen, nitrate total [as N]	30DA AVG	<= 18 mg/L	all year
004	Nitrogen, nitrate total [as N]	DAILY MX	<= 31.5 mg/L	all year
004	Phosphorus, total [as P]	30DA AVG	report only	all year
004	Phosphorus, total [as P]	DAILY MX	report only	all year
004	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	< 1 tox acute	all year
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.4 tox chronic	Mar
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 3.3 tox chronic	Jun
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 3.3 tox chronic	Nov
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 3.1 tox chronic	Sep
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.2 tox chronic	Dec
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.2 tox chronic	Feb
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 5 tox chronic	May
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.3 tox chronic	Jul
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 3.3 tox chronic	Oct
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.3 tox chronic	Aug
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 2.7 tox chronic	Jan
004	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	< 5.5 tox chronic	Apr
004	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	< 1 tox acute	all year
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.3 tox chronic	Jul
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.3 tox chronic	Aug
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.2 tox chronic	Feb
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.7 tox chronic	Jan
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 3.1 tox chronic	Sep
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 3.3 tox chronic	Jun
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.2 tox chronic	Dec
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 2.4 tox chronic	Mar
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 3.3 tox chronic	Oct
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 5 tox chronic	May
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 3.3 tox chronic	Nov
004	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	< 5.5 tox chronic	Apr
004	Solids, total dissolved	30DA AVG	<= 4315 mg/L	all year
004	Solids, total dissolved	DAILY MX	<= 4375 mg/L	all year
004	Oil and grease visual	DAILY MX	report only	all year