Mesa Co Grand Junction City of — NPDES permit CO0040053: limits, due date and EPA's record

NPDES permit CO0040053 · Major POTW · administratively continued, expires 2022-12-31 · EPA's file as of 2026-09-19

This permit expired on 2022-12-31 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 (242)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. centigrade	MX WK AV	report only	all year
001	Temperature, water deg. centigrade	DAILY MX	report only	all year
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	>= 6.5 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	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.9 mg/L	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.4 mg/L	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 6.1 mg/L	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.8 mg/L	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.9 mg/L	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.3 mg/L	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.7 mg/L	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.9 mg/L	Dec
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 9.8 mg/L	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.7 mg/L	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.6 mg/L	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 6 mg/L	Jan
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.8 mg/L	Feb
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 5.4 mg/L	Mar
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.8 mg/L	Apr
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 4 mg/L	May
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.2 mg/L	Jun
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.9 mg/L	Jul
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.7 mg/L	Aug
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.8 mg/L	Sep
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.2 mg/L	Oct
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.9 mg/L	Nov
001	Nitrogen, ammonia total [as N]	30DA AVG	<= 4.8 mg/L	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 40 mg/L	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 37 mg/L	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 33 mg/L	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 32 mg/L	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 31 mg/L	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 36 mg/L	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 33 mg/L	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 39 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 34 mg/L	Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 37 mg/L	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 35 mg/L	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 29 mg/L	Jan
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	Feb
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 37 mg/L	Mar
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 37 mg/L	Apr
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 33 mg/L	May
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 29 mg/L	Jun
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 31 mg/L	Jul
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 30 mg/L	Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 32 mg/L	Sep
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 32 mg/L	Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 32 mg/L	Nov
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 32 mg/L	Dec
001	Nitrogen, inorganic total	RM	report only	all year
001	Nitrogen, inorganic total	RM	<= 15 mg/L	all year
001	Nitrogen, inorganic total	95th %	report only	all year
001	Nitrogen, inorganic total	95th %	<= 20 mg/L	all year
001	Phosphorus, total [as P]	RM	report only	all year
001	Phosphorus, total [as P]	RM	<= 1 mg/L	all year
001	Phosphorus, total [as P]	95th %	report only	all year
001	Phosphorus, total [as P]	95th %	<= 2.5 mg/L	all year
001	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Arsenic, total recoverable	30DA AVG	report only	all year
001	Iron, total recoverable	30DA AVG	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	Aluminum, total recoverable	30DA AVG	report only	all year
001	Aluminum, total recoverable	DAILY MX	report only	all year
001	Chromium, total recoverable	30DA AVG	report only	all year
001	Chromium, total recoverable	DAILY MX	report only	all year
001	Molybdenum, total recoverable	30DA AVG	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Zinc, potentially dissolved	30DA AVG	report only	all year
001	Zinc, potentially dissolved	DAILY MX	report only	all year
001	Silver, potentially dissolved	30DA AVG	report only	all year
001	Silver, potentially dissolved	DAILY MX	report only	all year
001	Copper, potentially dissolved	30DA AVG	report only	all year
001	Copper, potentially dissolved	DAILY MX	report only	all year
001	Cadmium, potentially dissolvd	30DA AVG	report only	all year
001	Cadmium, potentially dissolvd	DAILY MX	report only	all year
001	Lead, potentially dissolvd	30DA AVG	report only	all year
001	Lead, potentially dissolvd	DAILY MX	report only	all year
001	Manganese, potentially dissolvd	30DA AVG	report only	all year
001	Manganese, potentially dissolvd	DAILY MX	report only	all year
001	Nickel, potentially dissolvd	30DA AVG	report only	all year
001	Nickel, potentially dissolvd	DAILY MX	report only	all year
001	Selenium, potentially dissolvd	30DA AVG	<= 4.6 ug/L	all year
001	Selenium, potentially dissolvd	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	<= 12.5 MGD	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Chlorine, total residual	30DA AVG	<= .011 mg/L	all year
001	Chlorine, total residual	INST MAX	<= .019 mg/L	all year
001	Mercury, total low level	30DA AVG	report only	all year
001	E. coli	30DA GM	<= 139 #/100mL	all year
001	E. coli	MX 7D GM	<= 278 #/100mL	all year
001	Nonylphenol	30DA AVG	<= 6.6 ug/L	all year
001	Nonylphenol	DAILY MX	report only	all year
001	Solids, total dissolved	30DA AVG	report only	all year
001	Solids, total dissolved	DAILY MX	report only	all year
001	Solids, total dissolved	30DA AVG	report only	all year
001	Solids, total dissolved	DAILY MX	report only	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
001	Static Renewal 7 Day Chronic Ceriodaphnia dubia	SINGSAMP	report only	all year
001	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	report only	all year
001	Static Renewal 7 Day Chronic Ceriodaphnia dubia	MN VALUE	>= 100 tox chronic	all year
001	Static Renewal 7 Day Chronic Pimephales promelas	SINGSAMP	report only	all year
001	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	report only	all year
001	Static Renewal 7 Day Chronic Pimephales promelas	MN VALUE	>= 100 tox chronic	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 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	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 19 mg/L	Jan
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 16 mg/L	Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 mg/L	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 14 mg/L	Apr
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 16 mg/L	May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Jun
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	Jul
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 11 mg/L	Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 12 mg/L	Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 mg/L	Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 17 mg/L	Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 19 mg/L	Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 65 mg/L	Jan
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 63 mg/L	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 62 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 46 mg/L	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 49 mg/L	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 46 mg/L	Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 47 mg/L	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 46 mg/L	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 47 mg/L	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 40 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 51 mg/L	Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 51 mg/L	Dec
002	Nitrogen, inorganic total	RM	report only	all year
002	Nitrogen, inorganic total	95th %	report only	all year
002	Phosphorus, total [as P]	RM	report only	all year
002	Phosphorus, total [as P]	95th %	report only	all year
002	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Arsenic, total recoverable	30DA AVG	report only	all year
002	Iron, total recoverable	30DA AVG	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Molybdenum, total [as Mo]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Aluminum, total recoverable	30DA AVG	report only	all year
002	Aluminum, total recoverable	DAILY MX	report only	all year
002	Chromium, total recoverable	30DA AVG	report only	all year
002	Chromium, total recoverable	DAILY MX	report only	all year
002	Molybdenum, total recoverable	30DA AVG	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Zinc, potentially dissolved	30DA AVG	report only	all year
002	Zinc, potentially dissolved	DAILY MX	report only	all year
002	Silver, potentially dissolved	30DA AVG	report only	all year
002	Silver, potentially dissolved	DAILY MX	report only	all year
002	Copper, potentially dissolved	30DA AVG	report only	all year
002	Copper, potentially dissolved	DAILY MX	report only	all year
002	Cadmium, potentially dissolvd	30DA AVG	report only	all year
002	Cadmium, potentially dissolvd	DAILY MX	report only	all year
002	Lead, potentially dissolvd	30DA AVG	report only	all year
002	Lead, potentially dissolvd	DAILY MX	report only	all year
002	Manganese, potentially dissolvd	30DA AVG	report only	all year
002	Manganese, potentially dissolvd	DAILY MX	report only	all year
002	Nickel, potentially dissolvd	30DA AVG	report only	all year
002	Nickel, potentially dissolvd	DAILY MX	report only	all year
002	Selenium, potentially dissolvd	30DA AVG	report only	all year
002	Selenium, potentially dissolvd	DAILY MX	report only	all year
002	Selenium, potentially dissolvd	ROLL AVG	report only	all year
002	Oil and grease	INST MAX	<= 10 mg/L	all year
002	Total phenols	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	<= 12.5 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	30DA AVG	<= .17 mg/L	all year
002	Chlorine, total residual	INST MAX	<= .2 mg/L	all year
002	Mercury, total low level	30DA AVG	report only	all year
002	E. coli	30DA GM	<= 2000 #/100mL	all year
002	E. coli	MX 7D GM	<= 4000 #/100mL	all year
002	E. coli	ROLL AVG	<= 1056 #/100mL	all year
002	Nonylphenol	30DA AVG	report only	all year
002	Solids, total dissolved	30DA AVG	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Solids, total dissolved	30DA AVG	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	BOD, 5-day, percent removal	MO AV MN	>= 85 %	all year
002	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
002	Oil and grease visual	INST MAX	report only	all year
002	LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	MN VALUE	>= 100 %	all year
002	LC50 Static Renewal 96Hr Acute Pimephales promelas	MN VALUE	>= 100 %	all year
003	Flow, in conduit or thru treatment plant	30DA AVG	<= 12.5 MGD	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	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