Northglenn City of — NPDES permit CO0036757: limits, due date and EPA's record

NPDES permit CO0036757 · Major POTW · administratively continued, expires 2024-12-31 · EPA's file as of 2026-09-19

This permit expired on 2024-12-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

Reporting

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

Limits in force (294)

Outfall	Parameter	Statistic	Limit	Months
001	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
001	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
001	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Arsenic, total [as As]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Chromium, total [as Cr]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY MX	report only	all year
001	Lead, total [as Pb]	DAILY MX	report only	all year
001	Molybdenum, total [as Mo]	DAILY MX	report only	all year
001	Nickel, total [as Ni]	DAILY MX	report only	all year
001	Silver, total [as Ag]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Oil and grease	INST MAX	<= 10 mg/L	all year
001	Total phenols	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	E. coli	30DA GM	<= 2000 #/100mL	all year
001	E. coli	MX 7D GM	<= 4000 #/100mL	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
001	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
001	Oil and grease visual	INST MAX	report only	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	<= 4.2 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Flow, in conduit or thru treatment plant	30DA AVG	<= 43.2 MGD	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Temperature, water deg. centigrade	MX WK AV	report only	all year
004	Temperature, water deg. centigrade	DAILY MX	report only	all year
004	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
004	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
004	pH	MINIMUM	>= 6.5 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
004	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Apr
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 mg/L	Feb
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 16 mg/L	Jan
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.8 mg/L	Jun
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 10 mg/L	May
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.1 mg/L	Aug
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.9 mg/L	Jul
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 14 mg/L	Dec
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Mar
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 5 mg/L	Oct
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.8 mg/L	Sep
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Nov
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 8.8 mg/L	Apr
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 20 mg/L	Feb
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 19 mg/L	Jan
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 8 mg/L	Jun
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	May
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 12 mg/L	Aug
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 12 mg/L	Jul
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 20 mg/L	Dec
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 16 mg/L	Mar
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 10 mg/L	Oct
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 25 mg/L	Sep
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 18 mg/L	Nov
004	Nitrogen, inorganic total	DAILY MX	<= 15 mg/L	all year
004	Nitrogen, inorganic total	DAILY MX	<= 14 mg/L	all year
004	Nitrogen, inorganic total	ANNL MEDN	report only	all year
004	Nitrogen, inorganic total	ANNL MEDN	<= 15 mg/L	all year
004	Nitrogen, inorganic total	95th %	report only	all year
004	Nitrogen, inorganic total	95th %	<= 20 mg/L	all year
004	Phosphorus, total [as P]	ANNL MEDN	report only	all year
004	Phosphorus, total [as P]	ANNL MEDN	<= 1 mg/L	all year
004	Phosphorus, total [as P]	95th %	report only	all year
004	Phosphorus, total [as P]	95th %	<= 2.5 mg/L	all year
004	Cyanide, weak acid, dissociable	DAILY MX	<= 5 ug/L	all year
004	Cyanide, total [as CN]	DAILY MX	report only	all year
004	Chloride [as Cl]	30DA AVG	<= 477 mg/L	all year
004	Arsenic, total recoverable	30DA AVG	report only	all year
004	Iron, total recoverable	30DA AVG	report only	all year
004	Iron, total recoverable	30DA AVG	<= 1013 ug/L	all year
004	Beryllium, total recoverable [as Be]	30DA AVG	report only	all year
004	Arsenic, total [as As]	DAILY MX	report only	all year
004	Cadmium, total [as Cd]	DAILY MX	report only	all year
004	Chromium, total [as Cr]	DAILY MX	report only	all year
004	Copper, total [as Cu]	DAILY MX	report only	all year
004	Iron, dissolved [as Fe]	30DA AVG	report only	all year
004	Iron, dissolved [as Fe]	30DA AVG	<= 865 ug/L	all year
004	Lead, total [as Pb]	DAILY MX	report only	all year
004	Manganese, dissolved [as Mn]	30DA AVG	<= 384 ug/L	all year
004	Molybdenum, total [as Mo]	DAILY MX	report only	all year
004	Nickel, total [as Ni]	DAILY MX	report only	all year
004	Silver, total [as Ag]	DAILY MX	report only	all year
004	Zinc, total [as Zn]	DAILY MX	report only	all year
004	Molybdenum, total recoverable	30DA AVG	report only	all year
004	Selenium, total [as Se]	DAILY MX	report only	all year
004	Chromium, hexavalent dissolved [as Cr]	30DA AVG	report only	all year
004	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
004	Manganese, potentially dissolvd	30DA AVG	report only	all year
004	Manganese, potentially dissolvd	DAILY MX	report only	all year
004	Oil and grease	INST MAX	<= 10 mg/L	all year
004	Total phenols	DAILY MX	report only	all year
004	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Chlorine, total residual	30DA AVG	<= .03 mg/L	all year
004	Chlorine, total residual	INST MAX	<= .021 mg/L	all year
004	Mercury, total [low level]	3E	report only	all year
004	E. coli	30DA GM	<= 205 #/100mL	all year
004	E. coli	MX 7D GM	<= 410 #/100mL	all year
004	Sulfide-hydrogen sulfide [undissociated]	30DA AVG	report only	all year
004	Nonylphenol	30DA AVG	report only	all year
004	Nonylphenol	DAILY MX	report only	all year
004	Mercury, total [as Hg]	DAILY MX	report only	all year
004	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
004	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
004	Sulfate	30DA AVG	report only	all year
004	Sulfate	30DA AVG	<= 402 mg/L	all year
004	Boron, total	30DA AVG	report only	all year
004	Oil and grease visual	INST MAX	report only	all year
004	Static Renewal 7 Day Chronic Ceriodaphnia dubia	SINGSAMP	report only	all year
004	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	report only	all year
004	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	>= 35 tox chronic	all year
004	Static Renewal 7 Day Chronic Pimephales promelas	SINGSAMP	report only	all year
004	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	report only	all year
004	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	>= 35 tox chronic	all year
005	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
005	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
005	pH	MINIMUM	>= 6 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
005	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
005	Cyanide, total [as CN]	DAILY MX	report only	all year
005	Arsenic, total [as As]	DAILY MX	report only	all year
005	Cadmium, total [as Cd]	DAILY MX	report only	all year
005	Chromium, total [as Cr]	DAILY MX	report only	all year
005	Copper, total [as Cu]	DAILY MX	report only	all year
005	Lead, total [as Pb]	DAILY MX	report only	all year
005	Molybdenum, total [as Mo]	DAILY MX	report only	all year
005	Nickel, total [as Ni]	DAILY MX	report only	all year
005	Silver, total [as Ag]	DAILY MX	report only	all year
005	Zinc, total [as Zn]	DAILY MX	report only	all year
005	Selenium, total [as Se]	DAILY MX	report only	all year
005	Oil and grease	INST MAX	<= 10 mg/L	all year
005	Total phenols	DAILY MX	report only	all year
005	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
005	E. coli	30DA GM	<= 2000 #/100mL	all year
005	E. coli	MX 7D GM	<= 4000 #/100mL	all year
005	Mercury, total [as Hg]	DAILY MX	report only	all year
005	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
005	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
005	Oil and grease visual	INST MAX	report only	all year
006	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
006	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
006	pH	MINIMUM	>= 6 SU	all year
006	pH	MAXIMUM	<= 9 SU	all year
006	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
006	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
006	Cyanide, total [as CN]	DAILY MX	report only	all year
006	Arsenic, total [as As]	DAILY MX	report only	all year
006	Cadmium, total [as Cd]	DAILY MX	report only	all year
006	Chromium, total [as Cr]	DAILY MX	report only	all year
006	Copper, total [as Cu]	DAILY MX	report only	all year
006	Lead, total [as Pb]	DAILY MX	report only	all year
006	Molybdenum, total [as Mo]	DAILY MX	report only	all year
006	Nickel, total [as Ni]	DAILY MX	report only	all year
006	Silver, total [as Ag]	DAILY MX	report only	all year
006	Zinc, total [as Zn]	DAILY MX	report only	all year
006	Selenium, total [as Se]	DAILY MX	report only	all year
006	Oil and grease	INST MAX	<= 10 mg/L	all year
006	Total phenols	DAILY MX	report only	all year
006	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
006	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
006	E. coli	30DA GM	<= 2000 #/100mL	all year
006	E. coli	MX 7D GM	<= 4000 #/100mL	all year
006	Mercury, total [as Hg]	DAILY MX	report only	all year
006	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
006	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
006	Oil and grease visual	INST MAX	report only	all year
007	Temperature, water deg. centigrade	MX WK AV	report only	all year
007	Temperature, water deg. centigrade	DAILY MX	report only	all year
007	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
007	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
007	pH	MINIMUM	>= 6.5 SU	all year
007	pH	MAXIMUM	<= 9 SU	all year
007	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
007	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 16 mg/L	Jan
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 5 mg/L	Oct
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Nov
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 14 mg/L	Dec
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 mg/L	Feb
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Mar
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Apr
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 10 mg/L	May
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.8 mg/L	Jun
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.9 mg/L	Jul
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.1 mg/L	Aug
007	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.8 mg/L	Sep
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 19 mg/L	Jan
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 10 mg/L	Oct
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 18 mg/L	Nov
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 20 mg/L	Dec
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 20 mg/L	Feb
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 16 mg/L	Mar
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 8.8 mg/L	Apr
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	May
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 8 mg/L	Jun
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 12 mg/L	Jul
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 12 mg/L	Aug
007	Nitrogen, ammonia total [as N]	DAILY MX	<= 25 mg/L	Sep
007	Nitrogen, inorganic total	DAILY MX	<= 15 mg/L	all year
007	Nitrogen, inorganic total	DAILY MX	<= 14 mg/L	all year
007	Nitrogen, inorganic total	ANNL MEDN	report only	all year
007	Nitrogen, inorganic total	ANNL MEDN	<= 15 mg/L	all year
007	Nitrogen, inorganic total	95th %	report only	all year
007	Nitrogen, inorganic total	95th %	<= 20 mg/L	all year
007	Phosphorus, total [as P]	ANNL MEDN	report only	all year
007	Phosphorus, total [as P]	ANNL MEDN	<= 1 mg/L	all year
007	Phosphorus, total [as P]	95th %	report only	all year
007	Phosphorus, total [as P]	95th %	<= 2.5 mg/L	all year
007	Cyanide, weak acid, dissociable	DAILY MX	<= 5 ug/L	all year
007	Cyanide, total [as CN]	DAILY MX	report only	all year
007	Chloride [as Cl]	30DA AVG	<= 477 mg/L	all year
007	Arsenic, total recoverable	30DA AVG	report only	all year
007	Iron, total recoverable	30DA AVG	report only	all year
007	Iron, total recoverable	30DA AVG	<= 1013 ug/L	all year
007	Beryllium, total recoverable [as Be]	30DA AVG	report only	all year
007	Arsenic, total [as As]	DAILY MX	report only	all year
007	Cadmium, total [as Cd]	DAILY MX	report only	all year
007	Chromium, total [as Cr]	DAILY MX	report only	all year
007	Copper, total [as Cu]	DAILY MX	report only	all year
007	Iron, dissolved [as Fe]	30DA AVG	report only	all year
007	Iron, dissolved [as Fe]	30DA AVG	<= 865 ug/L	all year
007	Lead, total [as Pb]	DAILY MX	report only	all year
007	Manganese, dissolved [as Mn]	30DA AVG	<= 384 ug/L	all year
007	Molybdenum, total [as Mo]	DAILY MX	report only	all year
007	Nickel, total [as Ni]	DAILY MX	report only	all year
007	Silver, total [as Ag]	DAILY MX	report only	all year
007	Zinc, total [as Zn]	DAILY MX	report only	all year
007	Molybdenum, total recoverable	30DA AVG	report only	all year
007	Selenium, total [as Se]	DAILY MX	report only	all year
007	Chromium, hexavalent dissolved [as Cr]	30DA AVG	report only	all year
007	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
007	Manganese, potentially dissolvd	30DA AVG	report only	all year
007	Manganese, potentially dissolvd	DAILY MX	report only	all year
007	Oil and grease	INST MAX	<= 10 mg/L	all year
007	Total phenols	DAILY MX	report only	all year
007	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
007	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
007	Chlorine, total residual	30DA AVG	<= .03 mg/L	all year
007	Chlorine, total residual	INST MAX	<= .021 mg/L	all year
007	Mercury, total [low level]	30DA AVG	report only	all year
007	E. coli	30DA GM	<= 205 #/100mL	all year
007	E. coli	MX 7D GM	<= 410 #/100mL	all year
007	Sulfide-hydrogen sulfide [undissociated]	30DA AVG	report only	all year
007	Nonylphenol	30DA AVG	report only	all year
007	Nonylphenol	DAILY MX	report only	all year
007	Mercury, total [as Hg]	DAILY MX	report only	all year
007	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
007	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
007	Sulfate	30DA AVG	report only	all year
007	Sulfate	30DA AVG	<= 402 mg/L	all year
007	Boron, total	30DA AVG	report only	all year
007	Oil and grease visual	INST MAX	report only	all year
007	Static Renewal 7 Day Chronic Ceriodaphnia dubia	SINGSAMP	report only	all year
007	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	report only	all year
007	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	>= 35 tox chronic	all year
007	Static Renewal 7 Day Chronic Pimephales promelas	SINGSAMP	report only	all year
007	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	report only	all year
007	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	>= 35 tox chronic	all year
300	Plant capacity fact. percent of capacity	30DA AVG	report only	all year
300	Plant capacity fact. percent of capacity	30DA AVG	report only	all year
300	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
300	BOD, 5-day, 20 deg. C	MX 7D AV	report only	all year
300	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
300	BOD, 5-day, 20 deg. C	MX 7D AV	report only	all year
300	Solids, total suspended	30DA AVG	report only	all year
300	Solids, total suspended	MX 7D AV	report only	all year
300	Cyanide, total [as CN]	DAILY MX	report only	all year
300	Arsenic, total [as As]	DAILY MX	report only	all year
300	Cadmium, total [as Cd]	DAILY MX	report only	all year
300	Chromium, total [as Cr]	DAILY MX	report only	all year
300	Copper, total [as Cu]	DAILY MX	report only	all year
300	Lead, total [as Pb]	DAILY MX	report only	all year
300	Molybdenum, total [as Mo]	DAILY MX	report only	all year
300	Nickel, total [as Ni]	DAILY MX	report only	all year
300	Silver, total [as Ag]	DAILY MX	report only	all year
300	Zinc, total [as Zn]	DAILY MX	report only	all year
300	Selenium, total [as Se]	DAILY MX	report only	all year
300	Total phenols	DAILY MX	report only	all year
300	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
300	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
300	Mercury, total [as Hg]	DAILY MX	report only	all year
UST1	Temperature, water deg. centigrade	MX WK AV	report only	all year
UST1	Temperature, water deg. centigrade	DAILY MX	report only	all year