USFWS - Rocky Mountain Arsenal NWR

NPDES permit CO0035009 · Minor FEDERAL · effective, expires 2027-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 8 forms filed late

Last period with anything received: 2026-03-31.

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 (158)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 5100 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 5100 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 4700 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 4700 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 3200 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 3200 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1900 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1900 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 2400 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 2400 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 3000 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3000 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 2300 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 2300 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1900 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 1900 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2300 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2300 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 3400 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3400 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3700 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 3700 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 3700 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 3700 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 13000 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 13000 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 7300 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 7300 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 6100 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 6100 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 7900 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 7900 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 10000 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 10000 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 9700 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 9700 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 7900 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 7900 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8700 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 8700 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 11000 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8900 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 8900 mg/L Dec
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jan
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jan
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Feb
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Feb
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Mar
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Mar
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Apr
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Apr
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L May
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L May
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jun
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jun
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jul
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Jul
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Aug
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Aug
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Sep
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Sep
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Oct
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Oct
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Nov
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Nov
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Dec
001Nitrogen, ammonia total [as N]ROLL AVG <= 600 mg/L Dec
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Cyanide, weak acid, dissociable30DA AVG report only all year
001Cyanide, weak acid, dissociable30DA AVG report only all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Chloride [as Cl]30DA AVG <= 250 mg/L all year
001Chloride [as Cl]30DA AVG <= 250 mg/L all year
001Chloride [as Cl]ROLL AVG <= 120 mg/L all year
001Chloride [as Cl]ROLL AVG <= 120 mg/L all year
001Boron, total recoverable30DA AVG <= 750 ug/L all year
001Boron, total recoverable30DA AVG <= 750 ug/L all year
001Boron, total recoverableROLL AVG <= 263 ug/L all year
001Boron, total recoverableROLL AVG <= 263 ug/L all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Zinc, potentially dissolved30DA AVG <= 175 ug/L all year
001Zinc, potentially dissolved30DA AVG <= 175 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 231 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 231 ug/L all year
001Zinc, potentially dissolvedROLL AVG <= 43 ug/L all year
001Zinc, potentially dissolvedROLL AVG <= 43 ug/L all year
001Copper, potentially dissolved30DA AVG <= 13 ug/L all year
001Copper, potentially dissolved30DA AVG <= 13 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 20 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 20 ug/L all year
001Copper, potentially dissolvedROLL AVG <= 11 ug/L all year
001Copper, potentially dissolvedROLL AVG <= 11 ug/L all year
001Selenium, potentially dissolvd30DA AVG <= 4.6 ug/L all year
001Selenium, potentially dissolvd30DA AVG <= 4.6 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 18.4 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 18.4 ug/L all year
001Selenium, potentially dissolvdROLL AVG <= 3 ug/L all year
001Selenium, potentially dissolvdROLL AVG <= 3 ug/L all year
001Manganese, total recoverable30DA AVG <= 200 ug/L all year
001Manganese, total recoverable30DA AVG <= 200 ug/L all year
001Manganese, total recoverableDAILY MX <= 3417 ug/L all year
001Manganese, total recoverableDAILY MX <= 3417 ug/L all year
001Manganese, total recoverableROLL AVG <= 64 ug/L all year
001Manganese, total recoverableROLL AVG <= 64 ug/L all year
001Chlorine, total residual30DA AVG <= 11 ug/L all year
001Chlorine, total residual30DA AVG <= 11 ug/L all year
001Chlorine, total residualDAILY MX <= 19 ug/L all year
001Chlorine, total residualDAILY MX <= 19 ug/L all year
001Chlorine, total residualROLL AVG <= 1.7 ug/L all year
001Chlorine, total residualROLL AVG <= 1.7 ug/L all year
001Mercury, total [low level]DAILY MX report only all year
001Mercury, total [low level]DAILY MX report only all year
001E. coli30DA AVG <= 126 #/100mL all year
001E. coli30DA AVG <= 126 #/100mL all year
001E. coliDAILY MX <= 252 #/100mL all year
001E. coliDAILY MX <= 252 #/100mL all year
001E. coliROLL AVG <= 20 #/100mL all year
001E. coliROLL AVG <= 20 #/100mL all year
001Nitrogen, Nitrite TotalDAILY MX report only all year
001Nitrogen, Nitrite TotalDAILY MX report only all year
001Nitrogen, Nitrate Total30DA AVG <= 100 mg/L all year
001Nitrogen, Nitrate Total30DA AVG <= 100 mg/L all year
001Nitrogen, Nitrate TotalROLL AVG <= 20 mg/L all year
001Nitrogen, Nitrate TotalROLL AVG <= 20 mg/L all year
001Nitrogen, Kjeldahl TotalDAILY MX report only all year
001Nitrogen, Kjeldahl TotalDAILY MX report only all year
001Flow, total30DA AVG report only all year
001Flow, total30DA AVG report only all year
001Flow, totalDAILY MX report only all year
001Flow, totalDAILY MX report only all year
001Oil and grease visualINST MAX < 1 N=0;Y=1 all year
001Oil and grease visualINST MAX < 1 N=0;Y=1 all year
001Pass/Fail Static 4 Day Chronic Pimephales PromelasVALUE < 1 pass=0;fail=1 all year
001Pass/Fail Static 4 Day Chronic Pimephales PromelasVALUE < 1 pass=0;fail=1 all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE < 1 pass=0;fail=1 all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE < 1 pass=0;fail=1 all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states