Williston City Of — NPDES permit ND0022349: limits, due date and EPA's record

NPDES permit ND0022349 · Major POTW · effective, expires 2028-03-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 30 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (148)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	DAILY MN	report only	all year
002	Temperature, water deg. centigrade	30DA AVG	report only	all year
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MN	report only	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	<= 25 mg/L	all year
002	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	DAILY MN	report only	all year
002	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
002	Oil & Grease	DAILY MN	report only	all year
002	Oil & Grease	MO AVG	report only	all year
002	Oil & Grease	DAILY MX	<= 10 mg/L	all year
002	Nitrogen, total [as N]	DAILY MN	report only	all year
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MN	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	DAILY MN	report only	all year
002	Phosphorus, total [as P]	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	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MN	report only	all year
002	Cyanide, total [as CN]	DAILY AV	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MN	report only	all year
002	Arsenic, total [as As]	DAILY AV	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Beryllium, total [as Be]	DAILY MN	report only	all year
002	Beryllium, total [as Be]	DAILY AV	report only	all year
002	Beryllium, total [as Be]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MN	report only	all year
002	Cadmium, total [as Cd]	DAILY AV	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MN	report only	all year
002	Chromium, total [as Cr]	DAILY AV	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MN	report only	all year
002	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MN	report only	all year
002	Lead, total [as Pb]	DAILY AV	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Thallium, total [as Tl]	DAILY MN	report only	all year
002	Thallium, total [as Tl]	DAILY AV	report only	all year
002	Thallium, total [as Tl]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MN	report only	all year
002	Nickel, total [as Ni]	DAILY AV	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MN	report only	all year
002	Silver, total [as Ag]	DAILY AV	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MN	report only	all year
002	Zinc, total [as Zn]	DAILY AV	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Antimony, total [as Sb]	DAILY MN	report only	all year
002	Antimony, total [as Sb]	DAILY AV	report only	all year
002	Antimony, total [as Sb]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MN	report only	all year
002	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Total phenols	DAILY MN	report only	all year
002	Total phenols	DAILY AV	report only	all year
002	Total phenols	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	DAILY MN	report only	all year
002	Chlorine, total residual	DAILY AV	report only	all year
002	Chlorine, total residual	DAILY MX	<= .1 mg/L	all year
002	BOD, percent removal [total]	MN VALUE	>= 85 %	all year
002	E. coli	DAILY MN	report only	Apr, May, Jun, Jul, Aug, Sep, Oct
002	E. coli	30DAVGEO	<= 126 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	E. coli	DAILY MX	<= 409 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	Mercury, total [as Hg]	DAILY MN	report only	all year
002	Mercury, total [as Hg]	DAILY AV	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Solids, suspended percent removal	MN VALUE	>= 85 %	all year
002	Flow, total	MO TOTAL	report only	all year
002	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY MN	report only	all year
002	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY AV	report only	all year
002	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY MX	report only	all year
002	Oil and grease visual	TOTAL	report only	all year
002	Toxic Units Static Renewal 48Hr Acute Ceriodaphnia dubia	M0	<= 1 tox acute	all year
002	TU Static Renewal 96Hr Acute Pimphales promelas	M0	<= 1 tox acute	all year
003	BOD, 5-day, 20 deg. C	DAILY MN	report only (alert)	all year
003	BOD, 5-day, 20 deg. C	30DA AVG	report only (alert)	all year
003	BOD, 5-day, 20 deg. C	MX 7D AV	report only (alert)	all year
003	pH	MINIMUM	report only (alert)	all year
003	pH	MAXIMUM	report only (alert)	all year
003	Solids, total suspended	DAILY MN	report only (alert)	all year
003	Solids, total suspended	30DA AVG	report only (alert)	all year
003	Solids, total suspended	MX 7D AV	report only (alert)	all year
003	Nitrogen, ammonia total [as N]	DAILY MN	report only (alert)	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	report only (alert)	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	report only (alert)	all year
003	Cyanide, total [as CN]	DAILY MN	report only	all year
003	Cyanide, total [as CN]	DAILY AV	report only	all year
003	Cyanide, total [as CN]	DAILY MX	report only	all year
003	Arsenic, total [as As]	DAILY MN	report only	all year
003	Arsenic, total [as As]	DAILY AV	report only	all year
003	Arsenic, total [as As]	DAILY MX	report only	all year
003	Beryllium, total [as Be]	DAILY MN	report only	all year
003	Beryllium, total [as Be]	DAILY AV	report only	all year
003	Beryllium, total [as Be]	DAILY MX	report only	all year
003	Cadmium, total [as Cd]	DAILY MN	report only	all year
003	Cadmium, total [as Cd]	DAILY AV	report only	all year
003	Cadmium, total [as Cd]	DAILY MX	report only	all year
003	Chromium, total [as Cr]	DAILY MN	report only	all year
003	Chromium, total [as Cr]	DAILY AV	report only	all year
003	Chromium, total [as Cr]	DAILY MX	report only	all year
003	Copper, total [as Cu]	DAILY MN	report only	all year
003	Copper, total [as Cu]	DAILY AV	report only	all year
003	Copper, total [as Cu]	DAILY MX	report only	all year
003	Lead, total [as Pb]	DAILY MN	report only	all year
003	Lead, total [as Pb]	DAILY AV	report only	all year
003	Lead, total [as Pb]	DAILY MX	report only	all year
003	Thallium, total [as Tl]	DAILY MN	report only	all year
003	Thallium, total [as Tl]	DAILY AV	report only	all year
003	Thallium, total [as Tl]	DAILY MX	report only	all year
003	Nickel, total [as Ni]	DAILY MN	report only	all year
003	Nickel, total [as Ni]	DAILY AV	report only	all year
003	Nickel, total [as Ni]	DAILY MX	report only	all year
003	Silver, total [as Ag]	DAILY MN	report only	all year
003	Silver, total [as Ag]	DAILY AV	report only	all year
003	Silver, total [as Ag]	DAILY MX	report only	all year
003	Zinc, total [as Zn]	DAILY MN	report only	all year
003	Zinc, total [as Zn]	DAILY AV	report only	all year
003	Zinc, total [as Zn]	DAILY MX	report only	all year
003	Antimony, total [as Sb]	DAILY MN	report only	all year
003	Antimony, total [as Sb]	DAILY AV	report only	all year
003	Antimony, total [as Sb]	DAILY MX	report only	all year
003	Selenium, total [as Se]	DAILY MN	report only	all year
003	Selenium, total [as Se]	DAILY AV	report only	all year
003	Selenium, total [as Se]	DAILY MX	report only	all year
003	Total phenols	DAILY MN	report only	all year
003	Total phenols	DAILY AV	report only	all year
003	Total phenols	DAILY MX	report only	all year
003	Mercury, total [as Hg]	DAILY MN	report only	all year
003	Mercury, total [as Hg]	DAILY AV	report only	all year
003	Mercury, total [as Hg]	DAILY MX	report only	all year
003	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY MN	report only	all year
003	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY AV	report only	all year
003	Hardness, tot calc. [Ca, Mg, Fe] as CaC03	DAILY MX	report only	all year