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Twentymile Coal Company

Bituminous Coal - Underground, Oak Creek, Colorado. NPDES permit CO0042161 expired Jun 30, 2012; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (30 values), outfall 001 form W quarterly (1 value), outfall 300 form I quarterly (12 values), outfall MON form 1 quarterly (44 values), outfall 002 form A quarterly
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 20 reports late

Limits in force (238)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUMar, Jun, Sep, Dec001
pHminimum≥ 6.5 SUMar, Jun, Sep, Dec001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUMar, Jun, Sep, Dec001
pHmaximum≤ 9 SUMar, Jun, Sep, Dec001
Solids, total suspended30-day average≤ 35 mg/Lall year001
Solids, total suspended30-day average≤ 35 mg/Lall year001
Solids, total suspended30-day average≤ 35 mg/LMar, Jun, Sep, Dec001
Solids, total suspended30-day average≤ 35 mg/LMar, Jun, Sep, Dec001
Solids, total suspendeddaily maximum≤ 70 mg/Lall year001
Solids, total suspendeddaily maximum≤ 70 mg/Lall year001
Solids, total suspendeddaily maximum≤ 70 mg/LMar, Jun, Sep, Dec001
Solids, total suspendeddaily maximum≤ 70 mg/LMar, Jun, Sep, Dec001
Solids, settleable30-day averagereport only (mL/L)all year001
Solids, settleable30-day averagereport only (mL/L)all year001
Solids, settleable30-day averagereport only (mL/L)Mar, Jun, Sep, Dec001
Solids, settleable30-day averagereport only (mL/L)Mar, Jun, Sep, Dec001
Solids, settleabledaily maximum≤ .5 mL/Lall year001
Solids, settleabledaily maximum≤ .5 mL/Lall year001
Solids, settleabledaily maximum≤ .5 mL/LMar, Jun, Sep, Dec001
Solids, settleabledaily maximum≤ .5 mL/LMar, Jun, Sep, Dec001
Iron, total recoverable30-day average≤ 1047 mg/Lall year001
Iron, total recoverable30-day average≤ 1047 mg/Lall year001
Iron, total recoverable30-day average≤ 1047 mg/LMar, Jun, Sep, Dec001
Iron, total recoverable30-day average≤ 1047 mg/LMar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)all year001
Iron, total recoverabledaily maximumreport only (mg/L)all year001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverablerolling averagereport only (mg/L)all year001
Iron, total recoverablerolling averagereport only (mg/L)all year001
Iron, total recoverablerolling averagereport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverablerolling averagereport only (mg/L)Mar, Jun, Sep, Dec001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Oil and greaseinstantaneous maximum≤ 10 mg/LMar, Jun, Sep, Dec001
Oil and greaseinstantaneous maximum≤ 10 mg/LMar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plant30-day average≤ 1.58 MGDall year001
Flow, in conduit or thru treatment plant30-day average≤ 1.58 MGDall year001
Flow, in conduit or thru treatment plant30-day average≤ 1.58 MGDMar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plant30-day average≤ 1.58 MGDMar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec001
Solids, total dissolvedquarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolvedquarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)Mar, Jun, Sep, Dec001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)Mar, Jun, Sep, Dec001
LC50 Static Renewal 48Hr Acute Daphnia magnaminimum value≥ 75.0001 %Mar001
LC50 Static Renewal 48Hr Acute Daphnia magnaminimum value≥ 81.0001 %Jun001
LC50 Static Renewal 48Hr Acute Daphnia magnaminimum value≥ 90.0001 %Sep001
LC50 Static Renewal 48Hr Acute Daphnia magnaminimum value≥ 88.0001 %Dec001
Sulfate [as S]30-day average≤ 250 mg/Lall year002
Sulfate [as S]30-day average≤ 250 mg/Lall year002
Sulfate [as S]30-day average≤ 250 mg/LMar, Jun, Sep, Dec002
Sulfate [as S]30-day average≤ 250 mg/LMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/LMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/LMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/LMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/LMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. C30-day average≤ 3.8 lb/dall year002
BOD, 5-day, 20 deg. C30-day average≤ 3.8 lb/dall year002
BOD, 5-day, 20 deg. C30-day average≤ 3.8 lb/dMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. C30-day average≤ 3.8 lb/dMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 5.6 lb/dall year002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 5.6 lb/dall year002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 5.6 lb/dMar, Jun, Sep, Dec002
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 5.6 lb/dMar, Jun, Sep, Dec002
pHminimum≥ 6.5 SUall year002
pHminimum≥ 6.5 SUall year002
pHminimum≥ 6.5 SUMar, Jun, Sep, Dec002
pHminimum≥ 6.5 SUMar, Jun, Sep, Dec002
pHmaximum≤ 8.5 SUall year002
pHmaximum≤ 8.5 SUall year002
pHmaximum≤ 8.5 SUMar, Jun, Sep, Dec002
pHmaximum≤ 8.5 SUMar, Jun, Sep, Dec002
Solids, total suspended30-day average≤ 75 mg/Lall year002
Solids, total suspended30-day average≤ 75 mg/Lall year002
Solids, total suspended30-day average≤ 75 mg/LMar, Jun, Sep, Dec002
Solids, total suspended30-day average≤ 75 mg/LMar, Jun, Sep, Dec002
Solids, total suspendeddaily maximum≤ 110 mg/Lall year002
Solids, total suspendeddaily maximum≤ 110 mg/Lall year002
Solids, total suspendeddaily maximum≤ 110 mg/LMar, Jun, Sep, Dec002
Solids, total suspendeddaily maximum≤ 110 mg/LMar, Jun, Sep, Dec002
Nitrite + Nitrate total [as N]30-day average≤ 10 mg/Lall year002
Nitrite + Nitrate total [as N]30-day average≤ 10 mg/Lall year002
Nitrite + Nitrate total [as N]30-day average≤ 10 mg/LMar, Jun, Sep, Dec002
Nitrite + Nitrate total [as N]30-day average≤ 10 mg/LMar, Jun, Sep, Dec002
Chloride [as Cl]30-day average≤ 250 mg/Lall year002
Chloride [as Cl]30-day average≤ 250 mg/Lall year002
Chloride [as Cl]30-day average≤ 250 mg/LMar, Jun, Sep, Dec002
Chloride [as Cl]30-day average≤ 250 mg/LMar, Jun, Sep, Dec002
Flow, in conduit or thru treatment plant30-day average≤ .015 MGDall year002
Flow, in conduit or thru treatment plant30-day average≤ .015 MGDall year002
Flow, in conduit or thru treatment plant30-day average≤ .015 MGDMar, Jun, Sep, Dec002
Flow, in conduit or thru treatment plant30-day average≤ .015 MGDMar, Jun, Sep, Dec002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec002
Chlorine, total residual30-day averagereport only (mg/L)all year002
Chlorine, total residual30-day averagereport only (mg/L)all year002
Chlorine, total residual30-day averagereport only (mg/L)Mar, Jun, Sep, Dec002
Chlorine, total residual30-day averagereport only (mg/L)Mar, Jun, Sep, Dec002
Chlorine, total residualdaily maximum≤ .5 mg/Lall year002
Chlorine, total residualdaily maximum≤ .5 mg/Lall year002
Chlorine, total residualdaily maximum≤ .5 mg/LMar, Jun, Sep, Dec002
Chlorine, total residualdaily maximum≤ .5 mg/LMar, Jun, Sep, Dec002
Coliform, fecal general30-day geometric meanreport only (#/100mL)all year002
Coliform, fecal general30-day geometric meanreport only (#/100mL)all year002
Coliform, fecal general30-day geometric meanreport only (#/100mL)Mar, Jun, Sep, Dec002
Coliform, fecal general30-day geometric meanreport only (#/100mL)Mar, Jun, Sep, Dec002
Coliform, fecal generalannual average≤ 2.2 #/100mLJun002
Coliform, fecal generalannual average≤ 2.2 #/100mLJun002
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)Mar, Jun, Sep, Dec300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)Mar, Jun, Sep, Dec300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)Mar, Jun, Sep, Dec300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)Mar, Jun, Sep, Dec300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Sep, Dec300
Arsenic, total [as As]30-day averagereport only (ug/L)all yearMON
Arsenic, total [as As]30-day averagereport only (ug/L)all yearMON
Arsenic, total [as As]30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Arsenic, total [as As]30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Arsenic, total [as As]daily maximumreport only (ug/L)all yearMON
Arsenic, total [as As]daily maximumreport only (ug/L)all yearMON
Arsenic, total [as As]daily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Arsenic, total [as As]daily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Zinc, potentially dissolved30-day averagereport only (ug/L)all yearMON
Zinc, potentially dissolved30-day averagereport only (ug/L)all yearMON
Zinc, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Zinc, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Zinc, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Zinc, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Zinc, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Zinc, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Silver, potentially dissolved30-day averagereport only (ug/L)all yearMON
Silver, potentially dissolved30-day averagereport only (ug/L)all yearMON
Silver, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Silver, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Silver, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Silver, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Silver, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Silver, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Copper, potentially dissolved30-day averagereport only (ug/L)all yearMON
Copper, potentially dissolved30-day averagereport only (ug/L)all yearMON
Copper, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Copper, potentially dissolved30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Copper, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Copper, potentially dissolveddaily maximumreport only (ug/L)all yearMON
Copper, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Copper, potentially dissolveddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Cadmium, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Cadmium, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Cadmium, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Cadmium, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Lead, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Lead, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Lead, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Lead, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Lead, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Lead, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Lead, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Lead, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Manganese, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Manganese, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Manganese, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Manganese, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Manganese, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Manganese, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Manganese, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Manganese, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Nickel, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Nickel, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Nickel, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Nickel, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Nickel, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Nickel, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Nickel, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Nickel, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Selenium, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Selenium, potentially dissolvd30-day averagereport only (ug/L)all yearMON
Selenium, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Selenium, potentially dissolvd30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Selenium, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Selenium, potentially dissolvddaily maximumreport only (ug/L)all yearMON
Selenium, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Selenium, potentially dissolvddaily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Mercury, total [as Hg]30-day averagereport only (ug/L)all yearMON
Mercury, total [as Hg]30-day averagereport only (ug/L)all yearMON
Mercury, total [as Hg]30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Mercury, total [as Hg]30-day averagereport only (ug/L)Mar, Jun, Sep, DecMON
Mercury, total [as Hg]daily maximumreport only (ug/L)all yearMON
Mercury, total [as Hg]daily maximumreport only (ug/L)all yearMON
Mercury, total [as Hg]daily maximumreport only (ug/L)Mar, Jun, Sep, DecMON
Mercury, total [as Hg]daily maximumreport only (ug/L)Mar, Jun, Sep, DecMON

How strict are these limits?

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

Same industry: the 19 Coal Mining 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/CO0042161 · MCP: https://passage-data.com/mcp