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

Sewage treatment plant, major discharger, Grand Junction, Colorado. NPDES permit CO0040053 expired Dec 31, 2022; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (242)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	maximum weekly average	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
BOD, 5-day, 20 deg. C	30-day average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum 7-day average	≤ 45 mg/L	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 30 mg/L	all year	001
Solids, total suspended	maximum 7-day average	≤ 45 mg/L	all year	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.9 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 6.1 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.8 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.9 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.3 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.7 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.9 mg/L	Dec	001
Nitrogen, ammonia total [as N]	30-day average	≤ 9.8 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.7 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.6 mg/L	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 6 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.8 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.4 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.8 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.2 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.9 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.7 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.2 mg/L	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.8 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 40 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 37 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 33 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 32 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 31 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 36 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 33 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 39 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 34 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 37 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 28 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 35 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 29 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 28 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 37 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 37 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 33 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 29 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 31 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 30 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 32 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 32 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 32 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 32 mg/L	Dec	001
Nitrogen, inorganic total	aggregate rolling median	report only (mg/L)	all year	001
Nitrogen, inorganic total	aggregate rolling median	≤ 15 mg/L	all year	001
Nitrogen, inorganic total	95th percentile	report only (mg/L)	all year	001
Nitrogen, inorganic total	95th percentile	≤ 20 mg/L	all year	001
Phosphorus, total [as P]	aggregate rolling median	report only (mg/L)	all year	001
Phosphorus, total [as P]	aggregate rolling median	≤ 1 mg/L	all year	001
Phosphorus, total [as P]	95th percentile	report only (mg/L)	all year	001
Phosphorus, total [as P]	95th percentile	≤ 2.5 mg/L	all year	001
Cyanide, weak acid, dissociable	daily maximum	report only (ug/L)	all year	001
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	001
Arsenic, total recoverable	30-day average	report only (ug/L)	all year	001
Iron, total recoverable	30-day average	report only (ug/L)	all year	001
Arsenic, total [as As]	daily maximum	report only (ug/L)	all year	001
Cadmium, total [as Cd]	daily maximum	report only (ug/L)	all year	001
Chromium, total [as Cr]	daily maximum	report only (ug/L)	all year	001
Copper, total [as Cu]	daily maximum	report only (ug/L)	all year	001
Lead, total [as Pb]	daily maximum	report only (ug/L)	all year	001
Molybdenum, total [as Mo]	daily maximum	report only (ug/L)	all year	001
Nickel, total [as Ni]	daily maximum	report only (ug/L)	all year	001
Silver, total [as Ag]	daily maximum	report only (ug/L)	all year	001
Zinc, total [as Zn]	daily maximum	report only (ug/L)	all year	001
Aluminum, total recoverable	30-day average	report only (ug/L)	all year	001
Aluminum, total recoverable	daily maximum	report only (ug/L)	all year	001
Chromium, total recoverable	30-day average	report only (ug/L)	all year	001
Chromium, total recoverable	daily maximum	report only (ug/L)	all year	001
Molybdenum, total recoverable	30-day average	report only (ug/L)	all year	001
Selenium, total [as Se]	daily maximum	report only (ug/L)	all year	001
Zinc, potentially dissolved	30-day average	report only (ug/L)	all year	001
Zinc, potentially dissolved	daily maximum	report only (ug/L)	all year	001
Silver, potentially dissolved	30-day average	report only (ug/L)	all year	001
Silver, potentially dissolved	daily maximum	report only (ug/L)	all year	001
Copper, potentially dissolved	30-day average	report only (ug/L)	all year	001
Copper, potentially dissolved	daily maximum	report only (ug/L)	all year	001
Cadmium, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Cadmium, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Lead, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Lead, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Manganese, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Nickel, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Nickel, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Selenium, potentially dissolvd	30-day average	≤ 4.6 ug/L	all year	001
Selenium, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	001
Total phenols	daily maximum	report only (ug/L)	all year	001
Flow, in conduit or thru treatment plant	30-day average	≤ 12.5 MGD	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	30-day average	≤ .011 mg/L	all year	001
Chlorine, total residual	instantaneous maximum	≤ .019 mg/L	all year	001
Mercury, total low level	30-day average	report only (ug/L)	all year	001
E. coli	30-day geometric mean	≤ 139 #/100mL	all year	001
E. coli	maximum 7-day geometric mean	≤ 278 #/100mL	all year	001
Nonylphenol	30-day average	≤ 6.6 ug/L	all year	001
Nonylphenol	daily maximum	report only (ug/L)	all year	001
Solids, total dissolved	30-day average	report only (mg/L)	all year	001
Solids, total dissolved	daily maximum	report only (mg/L)	all year	001
Solids, total dissolved	30-day average	report only (mg/L)	all year	001
Solids, total dissolved	daily maximum	report only (mg/L)	all year	001
Mercury, total [as Hg]	daily maximum	report only (ug/L)	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
Oil and grease visual	instantaneous maximum	report only (abst=0;prst=1)	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	single sample	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	≥ 100 tox chronic	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	single sample	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	≥ 100 tox chronic	all year	001
BOD, 5-day, 20 deg. C	30-day average	≤ 30 mg/L	all year	002
BOD, 5-day, 20 deg. C	maximum 7-day average	≤ 45 mg/L	all year	002
pH	minimum	≥ 6.5 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	30-day average	≤ 30 mg/L	all year	002
Solids, total suspended	maximum 7-day average	≤ 45 mg/L	all year	002
Nitrogen, ammonia total [as N]	30-day average	≤ 19 mg/L	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 16 mg/L	Feb	002
Nitrogen, ammonia total [as N]	30-day average	≤ 17 mg/L	Mar	002
Nitrogen, ammonia total [as N]	30-day average	≤ 14 mg/L	Apr	002
Nitrogen, ammonia total [as N]	30-day average	≤ 16 mg/L	May	002
Nitrogen, ammonia total [as N]	30-day average	≤ 13 mg/L	Jun	002
Nitrogen, ammonia total [as N]	30-day average	≤ 13 mg/L	Jul	002
Nitrogen, ammonia total [as N]	30-day average	≤ 11 mg/L	Aug	002
Nitrogen, ammonia total [as N]	30-day average	≤ 12 mg/L	Sep	002
Nitrogen, ammonia total [as N]	30-day average	≤ 17 mg/L	Oct	002
Nitrogen, ammonia total [as N]	30-day average	≤ 17 mg/L	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 19 mg/L	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 63 mg/L	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 62 mg/L	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 46 mg/L	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 49 mg/L	May	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 46 mg/L	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 47 mg/L	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 46 mg/L	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 47 mg/L	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 40 mg/L	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 51 mg/L	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 51 mg/L	Dec	002
Nitrogen, inorganic total	aggregate rolling median	report only (mg/L)	all year	002
Nitrogen, inorganic total	95th percentile	report only (mg/L)	all year	002
Phosphorus, total [as P]	aggregate rolling median	report only (mg/L)	all year	002
Phosphorus, total [as P]	95th percentile	report only (mg/L)	all year	002
Cyanide, weak acid, dissociable	daily maximum	report only (ug/L)	all year	002
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	002
Arsenic, total recoverable	30-day average	report only (ug/L)	all year	002
Iron, total recoverable	30-day average	report only (ug/L)	all year	002
Arsenic, total [as As]	daily maximum	report only (ug/L)	all year	002
Cadmium, total [as Cd]	daily maximum	report only (ug/L)	all year	002
Chromium, total [as Cr]	daily maximum	report only (ug/L)	all year	002
Copper, total [as Cu]	daily maximum	report only (ug/L)	all year	002
Lead, total [as Pb]	daily maximum	report only (ug/L)	all year	002
Molybdenum, total [as Mo]	daily maximum	report only (ug/L)	all year	002
Nickel, total [as Ni]	daily maximum	report only (ug/L)	all year	002
Silver, total [as Ag]	daily maximum	report only (ug/L)	all year	002
Zinc, total [as Zn]	daily maximum	report only (ug/L)	all year	002
Aluminum, total recoverable	30-day average	report only (ug/L)	all year	002
Aluminum, total recoverable	daily maximum	report only (ug/L)	all year	002
Chromium, total recoverable	30-day average	report only (ug/L)	all year	002
Chromium, total recoverable	daily maximum	report only (ug/L)	all year	002
Molybdenum, total recoverable	30-day average	report only (ug/L)	all year	002
Selenium, total [as Se]	daily maximum	report only (ug/L)	all year	002
Zinc, potentially dissolved	30-day average	report only (ug/L)	all year	002
Zinc, potentially dissolved	daily maximum	report only (ug/L)	all year	002
Silver, potentially dissolved	30-day average	report only (ug/L)	all year	002
Silver, potentially dissolved	daily maximum	report only (ug/L)	all year	002
Copper, potentially dissolved	30-day average	report only (ug/L)	all year	002
Copper, potentially dissolved	daily maximum	report only (ug/L)	all year	002
Cadmium, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Cadmium, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Lead, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Lead, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Manganese, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Nickel, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Nickel, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Selenium, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Selenium, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Selenium, potentially dissolvd	rolling average	report only (ug/L)	all year	002
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	002
Total phenols	daily maximum	report only (ug/L)	all year	002
Flow, in conduit or thru treatment plant	30-day average	≤ 12.5 MGD	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Chlorine, total residual	30-day average	≤ .17 mg/L	all year	002
Chlorine, total residual	instantaneous maximum	≤ .2 mg/L	all year	002
Mercury, total low level	30-day average	report only (ug/L)	all year	002
E. coli	30-day geometric mean	≤ 2000 #/100mL	all year	002
E. coli	maximum 7-day geometric mean	≤ 4000 #/100mL	all year	002
E. coli	rolling average	≤ 1056 #/100mL	all year	002
Nonylphenol	30-day average	report only (ug/L)	all year	002
Solids, total dissolved	30-day average	report only (mg/L)	all year	002
Solids, total dissolved	daily maximum	report only (mg/L)	all year	002
Solids, total dissolved	30-day average	report only (mg/L)	all year	002
Solids, total dissolved	daily maximum	report only (mg/L)	all year	002
Mercury, total [as Hg]	daily maximum	report only (ug/L)	all year	002
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	002
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	002
Oil and grease visual	instantaneous maximum	report only (abst=0;prst=1)	all year	002
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	minimum value	≥ 100 %	all year	002
LC50 Static Renewal 96Hr Acute Pimephales promelas	minimum value	≥ 100 %	all year	002
Flow, in conduit or thru treatment plant	30-day average	≤ 12.5 MGD	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
Plant capacity fact. percent of capacity	30-day average	report only (%)	all year	300
Plant capacity fact. percent of capacity	30-day average	report only (%)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (lb/d)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (lb/d)	all year	300
Solids, total suspended	30-day average	report only (mg/L)	all year	300
Solids, total suspended	maximum 7-day average	report only (mg/L)	all year	300
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	300
Arsenic, total [as As]	daily maximum	report only (ug/L)	all year	300
Cadmium, total [as Cd]	daily maximum	report only (ug/L)	all year	300
Chromium, total [as Cr]	daily maximum	report only (ug/L)	all year	300
Copper, total [as Cu]	daily maximum	report only (ug/L)	all year	300
Lead, total [as Pb]	daily maximum	report only (ug/L)	all year	300
Molybdenum, total [as Mo]	daily maximum	report only (ug/L)	all year	300
Nickel, total [as Ni]	daily maximum	report only (ug/L)	all year	300
Silver, total [as Ag]	daily maximum	report only (ug/L)	all year	300
Zinc, total [as Zn]	daily maximum	report only (ug/L)	all year	300
Selenium, total [as Se]	daily maximum	report only (ug/L)	all year	300
Total phenols	daily maximum	report only (ug/L)	all year	300
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	300
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	300
Mercury, total [as Hg]	daily maximum	report only (ug/L)	all year	300
Temperature, water deg. centigrade	maximum weekly average	report only (deg C)	all year	UST1
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	UST1

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/CO0040053 · MCP: https://passage-data.com/mcp