Twentymile Coal Company

NPDES permit CO0042161 · Minor NON-POTW · administratively continued, expires 2012-06-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2012-06-30 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

0values over a limit
0required values missing, on 0 form(s)
0of 20 forms filed late

Last period with anything received: 2026-06-30.

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 (238)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM >= 6.5 SU Mar, Jun, Sep, Dec
001pHMINIMUM >= 6.5 SU Mar, Jun, Sep, Dec
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU Mar, Jun, Sep, Dec
001pHMAXIMUM <= 9 SU Mar, Jun, Sep, Dec
001Solids, total suspended30DA AVG <= 35 mg/L all year
001Solids, total suspended30DA AVG <= 35 mg/L all year
001Solids, total suspended30DA AVG <= 35 mg/L Mar, Jun, Sep, Dec
001Solids, total suspended30DA AVG <= 35 mg/L Mar, Jun, Sep, Dec
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L Mar, Jun, Sep, Dec
001Solids, total suspendedDAILY MX <= 70 mg/L Mar, Jun, Sep, Dec
001Solids, settleable30DA AVG report only all year
001Solids, settleable30DA AVG report only all year
001Solids, settleable30DA AVG report only Mar, Jun, Sep, Dec
001Solids, settleable30DA AVG report only Mar, Jun, Sep, Dec
001Solids, settleableDAILY MX <= .5 mL/L all year
001Solids, settleableDAILY MX <= .5 mL/L all year
001Solids, settleableDAILY MX <= .5 mL/L Mar, Jun, Sep, Dec
001Solids, settleableDAILY MX <= .5 mL/L Mar, Jun, Sep, Dec
001Iron, total recoverable30DA AVG <= 1047 mg/L all year
001Iron, total recoverable30DA AVG <= 1047 mg/L all year
001Iron, total recoverable30DA AVG <= 1047 mg/L Mar, Jun, Sep, Dec
001Iron, total recoverable30DA AVG <= 1047 mg/L Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableROLL AVG report only all year
001Iron, total recoverableROLL AVG report only all year
001Iron, total recoverableROLL AVG report only Mar, Jun, Sep, Dec
001Iron, total recoverableROLL AVG report only Mar, Jun, Sep, Dec
001Oil and greaseINST MAX <= 10 mg/L all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Oil and greaseINST MAX <= 10 mg/L Mar, Jun, Sep, Dec
001Oil and greaseINST MAX <= 10 mg/L Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plant30DA AVG <= 1.58 MGD all year
001Flow, in conduit or thru treatment plant30DA AVG <= 1.58 MGD all year
001Flow, in conduit or thru treatment plant30DA AVG <= 1.58 MGD Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plant30DA AVG <= 1.58 MGD Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedQRTR AVG report only Mar, Jun, Sep, Dec
001Solids, total dissolvedQRTR AVG report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Oil and grease visualINST MAX report only all year
001Oil and grease visualINST MAX report only all year
001Oil and grease visualINST MAX report only Mar, Jun, Sep, Dec
001Oil and grease visualINST MAX report only Mar, Jun, Sep, Dec
001LC50 Static Renewal 48Hr Acute Daphnia magnaMN VALUE >= 75.0001 % Mar
001LC50 Static Renewal 48Hr Acute Daphnia magnaMN VALUE >= 81.0001 % Jun
001LC50 Static Renewal 48Hr Acute Daphnia magnaMN VALUE >= 90.0001 % Sep
001LC50 Static Renewal 48Hr Acute Daphnia magnaMN VALUE >= 88.0001 % Dec
002Sulfate [as S]30DA AVG <= 250 mg/L all year
002Sulfate [as S]30DA AVG <= 250 mg/L all year
002Sulfate [as S]30DA AVG <= 250 mg/L Mar, Jun, Sep, Dec
002Sulfate [as S]30DA AVG <= 250 mg/L Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. C30DA AVG <= 3.8 lb/d all year
002BOD, 5-day, 20 deg. C30DA AVG <= 3.8 lb/d all year
002BOD, 5-day, 20 deg. C30DA AVG <= 3.8 lb/d Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. C30DA AVG <= 3.8 lb/d Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. CMX 7D AV <= 5.6 lb/d all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 5.6 lb/d all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 5.6 lb/d Mar, Jun, Sep, Dec
002BOD, 5-day, 20 deg. CMX 7D AV <= 5.6 lb/d Mar, Jun, Sep, Dec
002pHMINIMUM >= 6.5 SU all year
002pHMINIMUM >= 6.5 SU all year
002pHMINIMUM >= 6.5 SU Mar, Jun, Sep, Dec
002pHMINIMUM >= 6.5 SU Mar, Jun, Sep, Dec
002pHMAXIMUM <= 8.5 SU all year
002pHMAXIMUM <= 8.5 SU all year
002pHMAXIMUM <= 8.5 SU Mar, Jun, Sep, Dec
002pHMAXIMUM <= 8.5 SU Mar, Jun, Sep, Dec
002Solids, total suspended30DA AVG <= 75 mg/L all year
002Solids, total suspended30DA AVG <= 75 mg/L all year
002Solids, total suspended30DA AVG <= 75 mg/L Mar, Jun, Sep, Dec
002Solids, total suspended30DA AVG <= 75 mg/L Mar, Jun, Sep, Dec
002Solids, total suspendedDAILY MX <= 110 mg/L all year
002Solids, total suspendedDAILY MX <= 110 mg/L all year
002Solids, total suspendedDAILY MX <= 110 mg/L Mar, Jun, Sep, Dec
002Solids, total suspendedDAILY MX <= 110 mg/L Mar, Jun, Sep, Dec
002Nitrite + Nitrate total [as N]30DA AVG <= 10 mg/L all year
002Nitrite + Nitrate total [as N]30DA AVG <= 10 mg/L all year
002Nitrite + Nitrate total [as N]30DA AVG <= 10 mg/L Mar, Jun, Sep, Dec
002Nitrite + Nitrate total [as N]30DA AVG <= 10 mg/L Mar, Jun, Sep, Dec
002Chloride [as Cl]30DA AVG <= 250 mg/L all year
002Chloride [as Cl]30DA AVG <= 250 mg/L all year
002Chloride [as Cl]30DA AVG <= 250 mg/L Mar, Jun, Sep, Dec
002Chloride [as Cl]30DA AVG <= 250 mg/L Mar, Jun, Sep, Dec
002Flow, in conduit or thru treatment plant30DA AVG <= .015 MGD all year
002Flow, in conduit or thru treatment plant30DA AVG <= .015 MGD all year
002Flow, in conduit or thru treatment plant30DA AVG <= .015 MGD Mar, Jun, Sep, Dec
002Flow, in conduit or thru treatment plant30DA AVG <= .015 MGD Mar, Jun, Sep, Dec
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
002Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
002Chlorine, total residual30DA AVG report only all year
002Chlorine, total residual30DA AVG report only all year
002Chlorine, total residual30DA AVG report only Mar, Jun, Sep, Dec
002Chlorine, total residual30DA AVG report only Mar, Jun, Sep, Dec
002Chlorine, total residualDAILY MX <= .5 mg/L all year
002Chlorine, total residualDAILY MX <= .5 mg/L all year
002Chlorine, total residualDAILY MX <= .5 mg/L Mar, Jun, Sep, Dec
002Chlorine, total residualDAILY MX <= .5 mg/L Mar, Jun, Sep, Dec
002Coliform, fecal general30DA GM report only all year
002Coliform, fecal general30DA GM report only all year
002Coliform, fecal general30DA GM report only Mar, Jun, Sep, Dec
002Coliform, fecal general30DA GM report only Mar, Jun, Sep, Dec
002Coliform, fecal generalANNL AVG <= 2.2 #/100mL Jun
002Coliform, fecal generalANNL AVG <= 2.2 #/100mL Jun
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. C30DA AVG report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. CMX 7D AV report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. C30DA AVG report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only Mar, Jun, Sep, Dec
300BOD, 5-day, 20 deg. CMX 7D AV report only Mar, Jun, Sep, Dec
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only Mar, Jun, Sep, Dec
300Flow, in conduit or thru treatment plant30DA AVG report only Mar, Jun, Sep, Dec
300Flow, in conduit or thru treatment plantDAILY MX report only all year
300Flow, in conduit or thru treatment plantDAILY MX report only all year
300Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
300Flow, in conduit or thru treatment plantDAILY MX report only Mar, Jun, Sep, Dec
MONArsenic, total [as As]30DA AVG report only all year
MONArsenic, total [as As]30DA AVG report only all year
MONArsenic, total [as As]30DA AVG report only Mar, Jun, Sep, Dec
MONArsenic, total [as As]30DA AVG report only Mar, Jun, Sep, Dec
MONArsenic, total [as As]DAILY MX report only all year
MONArsenic, total [as As]DAILY MX report only all year
MONArsenic, total [as As]DAILY MX report only Mar, Jun, Sep, Dec
MONArsenic, total [as As]DAILY MX report only Mar, Jun, Sep, Dec
MONZinc, potentially dissolved30DA AVG report only all year
MONZinc, potentially dissolved30DA AVG report only all year
MONZinc, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONZinc, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONZinc, potentially dissolvedDAILY MX report only all year
MONZinc, potentially dissolvedDAILY MX report only all year
MONZinc, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONZinc, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONSilver, potentially dissolved30DA AVG report only all year
MONSilver, potentially dissolved30DA AVG report only all year
MONSilver, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONSilver, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONSilver, potentially dissolvedDAILY MX report only all year
MONSilver, potentially dissolvedDAILY MX report only all year
MONSilver, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONSilver, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONCopper, potentially dissolved30DA AVG report only all year
MONCopper, potentially dissolved30DA AVG report only all year
MONCopper, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONCopper, potentially dissolved30DA AVG report only Mar, Jun, Sep, Dec
MONCopper, potentially dissolvedDAILY MX report only all year
MONCopper, potentially dissolvedDAILY MX report only all year
MONCopper, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONCopper, potentially dissolvedDAILY MX report only Mar, Jun, Sep, Dec
MONCadmium, potentially dissolvd30DA AVG report only all year
MONCadmium, potentially dissolvd30DA AVG report only all year
MONCadmium, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONCadmium, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONCadmium, potentially dissolvdDAILY MX report only all year
MONCadmium, potentially dissolvdDAILY MX report only all year
MONCadmium, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONCadmium, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONChromium, trivalent, potentially dissolvd30DA AVG report only all year
MONChromium, trivalent, potentially dissolvd30DA AVG report only all year
MONChromium, trivalent, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONChromium, trivalent, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONChromium, trivalent, potentially dissolvdDAILY MX report only all year
MONChromium, trivalent, potentially dissolvdDAILY MX report only all year
MONChromium, trivalent, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONChromium, trivalent, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONLead, potentially dissolvd30DA AVG report only all year
MONLead, potentially dissolvd30DA AVG report only all year
MONLead, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONLead, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONLead, potentially dissolvdDAILY MX report only all year
MONLead, potentially dissolvdDAILY MX report only all year
MONLead, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONLead, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONManganese, potentially dissolvd30DA AVG report only all year
MONManganese, potentially dissolvd30DA AVG report only all year
MONManganese, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONManganese, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONManganese, potentially dissolvdDAILY MX report only all year
MONManganese, potentially dissolvdDAILY MX report only all year
MONManganese, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONManganese, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONNickel, potentially dissolvd30DA AVG report only all year
MONNickel, potentially dissolvd30DA AVG report only all year
MONNickel, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONNickel, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONNickel, potentially dissolvdDAILY MX report only all year
MONNickel, potentially dissolvdDAILY MX report only all year
MONNickel, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONNickel, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONSelenium, potentially dissolvd30DA AVG report only all year
MONSelenium, potentially dissolvd30DA AVG report only all year
MONSelenium, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONSelenium, potentially dissolvd30DA AVG report only Mar, Jun, Sep, Dec
MONSelenium, potentially dissolvdDAILY MX report only all year
MONSelenium, potentially dissolvdDAILY MX report only all year
MONSelenium, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONSelenium, potentially dissolvdDAILY MX report only Mar, Jun, Sep, Dec
MONMercury, total [as Hg]30DA AVG report only all year
MONMercury, total [as Hg]30DA AVG report only all year
MONMercury, total [as Hg]30DA AVG report only Mar, Jun, Sep, Dec
MONMercury, total [as Hg]30DA AVG report only Mar, Jun, Sep, Dec
MONMercury, total [as Hg]DAILY MX report only all year
MONMercury, total [as Hg]DAILY MX report only all year
MONMercury, total [as Hg]DAILY MX report only Mar, Jun, Sep, Dec
MONMercury, total [as Hg]DAILY MX report only Mar, Jun, Sep, Dec

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