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USFWS - Rocky Mountain Arsenal NWR

Federal facility (Water Supply), Commerce City, Colorado. NPDES permit CO0035009, in force until May 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A yearly (88 values), form W yearly
Renewal application due
Dec 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
March 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (158)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
pHminimum≥ 6.5 SUall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 5100 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5100 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4700 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4700 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3200 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3200 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1900 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1900 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2400 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2400 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3000 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3000 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2300 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2300 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1900 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1900 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2300 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2300 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3400 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3400 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3700 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3700 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3700 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3700 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 13000 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 13000 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7300 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 7300 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 6100 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 6100 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7900 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 7900 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 10000 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 10000 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 9700 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 9700 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 7900 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7900 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8700 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8700 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 11000 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8900 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 8900 mg/LDec
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJan
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJan
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LFeb
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LFeb
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LMar
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LMar
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LApr
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LApr
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LMay
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LMay
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJun
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJun
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJul
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LJul
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LAug
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LAug
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LSep
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LSep
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LOct
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LOct
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LNov
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LNov
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LDec
Nitrogen, ammonia total [as N]rolling average≤ 600 mg/LDec
Phosphorus, total [as P]daily maximumreport only (ug/L)all year
Phosphorus, total [as P]daily maximumreport only (ug/L)all year
Cyanide, weak acid, dissociable30-day averagereport only (ug/L)all year
Cyanide, weak acid, dissociable30-day averagereport only (ug/L)all year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Chloride [as Cl]30-day average≤ 250 mg/Lall year
Chloride [as Cl]30-day average≤ 250 mg/Lall year
Chloride [as Cl]rolling average≤ 120 mg/Lall year
Chloride [as Cl]rolling average≤ 120 mg/Lall year
Boron, total recoverable30-day average≤ 750 ug/Lall year
Boron, total recoverable30-day average≤ 750 ug/Lall year
Boron, total recoverablerolling average≤ 263 ug/Lall year
Boron, total recoverablerolling average≤ 263 ug/Lall year
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year
Zinc, potentially dissolved30-day average≤ 175 ug/Lall year
Zinc, potentially dissolved30-day average≤ 175 ug/Lall year
Zinc, potentially dissolveddaily maximum≤ 231 ug/Lall year
Zinc, potentially dissolveddaily maximum≤ 231 ug/Lall year
Zinc, potentially dissolvedrolling average≤ 43 ug/Lall year
Zinc, potentially dissolvedrolling average≤ 43 ug/Lall year
Copper, potentially dissolved30-day average≤ 13 ug/Lall year
Copper, potentially dissolved30-day average≤ 13 ug/Lall year
Copper, potentially dissolveddaily maximum≤ 20 ug/Lall year
Copper, potentially dissolveddaily maximum≤ 20 ug/Lall year
Copper, potentially dissolvedrolling average≤ 11 ug/Lall year
Copper, potentially dissolvedrolling average≤ 11 ug/Lall year
Selenium, potentially dissolvd30-day average≤ 4.6 ug/Lall year
Selenium, potentially dissolvd30-day average≤ 4.6 ug/Lall year
Selenium, potentially dissolvddaily maximum≤ 18.4 ug/Lall year
Selenium, potentially dissolvddaily maximum≤ 18.4 ug/Lall year
Selenium, potentially dissolvdrolling average≤ 3 ug/Lall year
Selenium, potentially dissolvdrolling average≤ 3 ug/Lall year
Manganese, total recoverable30-day average≤ 200 ug/Lall year
Manganese, total recoverable30-day average≤ 200 ug/Lall year
Manganese, total recoverabledaily maximum≤ 3417 ug/Lall year
Manganese, total recoverabledaily maximum≤ 3417 ug/Lall year
Manganese, total recoverablerolling average≤ 64 ug/Lall year
Manganese, total recoverablerolling average≤ 64 ug/Lall year
Chlorine, total residual30-day average≤ 11 ug/Lall year
Chlorine, total residual30-day average≤ 11 ug/Lall year
Chlorine, total residualdaily maximum≤ 19 ug/Lall year
Chlorine, total residualdaily maximum≤ 19 ug/Lall year
Chlorine, total residualrolling average≤ 1.7 ug/Lall year
Chlorine, total residualrolling average≤ 1.7 ug/Lall year
Mercury, total [low level]daily maximumreport only (ug/L)all year
Mercury, total [low level]daily maximumreport only (ug/L)all year
E. coli30-day average≤ 126 #/100mLall year
E. coli30-day average≤ 126 #/100mLall year
E. colidaily maximum≤ 252 #/100mLall year
E. colidaily maximum≤ 252 #/100mLall year
E. colirolling average≤ 20 #/100mLall year
E. colirolling average≤ 20 #/100mLall year
Nitrogen, Nitrite Totaldaily maximumreport only (ug/L)all year
Nitrogen, Nitrite Totaldaily maximumreport only (ug/L)all year
Nitrogen, Nitrate Total30-day average≤ 100 mg/Lall year
Nitrogen, Nitrate Total30-day average≤ 100 mg/Lall year
Nitrogen, Nitrate Totalrolling average≤ 20 mg/Lall year
Nitrogen, Nitrate Totalrolling average≤ 20 mg/Lall year
Nitrogen, Kjeldahl Totaldaily maximumreport only (ug/L)all year
Nitrogen, Kjeldahl Totaldaily maximumreport only (ug/L)all year
Flow, total30-day averagereport only (MGD)all year
Flow, total30-day averagereport only (MGD)all year
Flow, totaldaily maximumreport only (MGD)all year
Flow, totaldaily maximumreport only (MGD)all year
Oil and grease visualinstantaneous maximum< 1 N=0;Y=1all year
Oil and grease visualinstantaneous maximum< 1 N=0;Y=1all year
Pass/Fail Static 4 Day Chronic Pimephales Promelasvalue< 1 pass=0;fail=1all year
Pass/Fail Static 4 Day Chronic Pimephales Promelasvalue< 1 pass=0;fail=1all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiavalue< 1 pass=0;fail=1all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiavalue< 1 pass=0;fail=1all year

How strict are these limits?

Cited limits by parameter: Colorado's rules and the federal ones.

Same industry: the 13 Water Supply permits in Colorado.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CO0035009 · MCP: https://passage-data.com/mcp