Williams Fork Mining LLC

NPDES permit CO0034142 · Minor NON-POTW · administratively continued, expires 2017-10-31 · 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 2017-10-31 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 19 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 (134)

OutfallParameterStatisticLimitMonths
003Temperature, water deg. centigradeMX WK AV report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspended30DA AVG <= 35 mg/L all year
003Solids, total suspendedDAILY MX <= 70 mg/L all year
003Sulfide, total [as S]30DA AVG report only all year
003Iron, total recoverable30DA AVG <= 1000 ug/L all year
003Iron, total recoverableDAILY MX <= 6000 ug/L all year
003Arsenic, total [as As]30DA AVG report only all year
003Chromium, total recoverableDAILY MX report only all year
003Zinc, potentially dissolved30DA AVG report only all year
003Zinc, potentially dissolvedDAILY MX report only all year
003Silver, potentially dissolved30DA AVG report only all year
003Silver, potentially dissolvedDAILY MX report only all year
003Copper, potentially dissolved30DA AVG report only all year
003Copper, potentially dissolvedDAILY MX report only all year
003Arsenic, potentially dissolvedDAILY MX report only all year
003Cadmium, potentially dissolvd30DA AVG report only all year
003Cadmium, potentially dissolvdDAILY MX report only all year
003Lead, potentially dissolvd30DA AVG report only all year
003Lead, potentially dissolvdDAILY MX report only all year
003Manganese, potentially dissolvd30DA AVG report only all year
003Manganese, potentially dissolvdDAILY MX report only all year
003Nickel, potentially dissolvd30DA AVG report only all year
003Nickel, potentially dissolvdDAILY MX report only all year
003Selenium, potentially dissolvd30DA AVG report only all year
003Selenium, potentially dissolvdDAILY MX report only all year
003Oil and greaseINST MAX <= 10 mg/L all year
003Chromium, trivalent total recoverableDAILY MX report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
003Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
003Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
003Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
003Solids, total dissolved30DA AVG report only all year
003Solids, total dissolvedDAILY MX report only all year
003Mercury, total [as Hg]30DA AVG report only all year
003Oil and grease visualINST MAX report only all year
003%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
003%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 18 % all year
003%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE report only all year
003%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE >= 18 % all year
022Temperature, water deg. centigradeMX WK AV report only all year
022Temperature, water deg. centigradeDAILY MX report only all year
022pHMINIMUM >= 6.5 SU all year
022pHMAXIMUM <= 9 SU all year
022Solids, total suspended30DA AVG <= 35 mg/L all year
022Solids, total suspendedDAILY MX <= 70 mg/L all year
022Sulfide, total [as S]30DA AVG report only all year
022Iron, total recoverable30DA AVG <= 1000 ug/L all year
022Iron, total recoverableDAILY MX <= 6000 ug/L all year
022Arsenic, total [as As]30DA AVG report only all year
022Chromium, total recoverableDAILY MX report only all year
022Zinc, potentially dissolved30DA AVG report only all year
022Zinc, potentially dissolvedDAILY MX report only all year
022Silver, potentially dissolved30DA AVG report only all year
022Silver, potentially dissolvedDAILY MX report only all year
022Copper, potentially dissolved30DA AVG report only all year
022Copper, potentially dissolvedDAILY MX report only all year
022Arsenic, potentially dissolvedDAILY MX report only all year
022Cadmium, potentially dissolvd30DA AVG report only all year
022Cadmium, potentially dissolvdDAILY MX report only all year
022Lead, potentially dissolvd30DA AVG report only all year
022Lead, potentially dissolvdDAILY MX report only all year
022Manganese, potentially dissolvd30DA AVG report only all year
022Manganese, potentially dissolvdDAILY MX report only all year
022Nickel, potentially dissolvd30DA AVG report only all year
022Nickel, potentially dissolvdDAILY MX report only all year
022Selenium, potentially dissolvd30DA AVG report only all year
022Selenium, potentially dissolvdDAILY MX report only all year
022Oil and greaseINST MAX <= 10 mg/L all year
022Chromium, trivalent total recoverableDAILY MX report only all year
022Flow, in conduit or thru treatment plant30DA AVG report only all year
022Flow, in conduit or thru treatment plantDAILY MX report only all year
022Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
022Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
022Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
022Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
022Solids, total dissolved30DA AVG report only all year
022Solids, total dissolvedDAILY MX report only all year
022Mercury, total [as Hg]30DA AVG report only all year
022Oil and grease visualINST MAX report only all year
022%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
022%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 18 % all year
022%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE report only all year
022%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE >= 18 % all year
024Temperature, water deg. centigradeMX WK AV report only all year
024Temperature, water deg. centigradeDAILY MX report only all year
024pHMINIMUM >= 6.5 SU all year
024pHMAXIMUM <= 9 SU all year
024Solids, total suspended30DA AVG <= 35 mg/L all year
024Solids, total suspendedDAILY MX <= 70 mg/L all year
024Sulfide, total [as S]30DA AVG report only all year
024Iron, total recoverable30DA AVG <= 1000 ug/L all year
024Iron, total recoverableDAILY MX <= 6000 ug/L all year
024Arsenic, total [as As]30DA AVG report only all year
024Chromium, total recoverableDAILY MX report only all year
024Zinc, potentially dissolved30DA AVG report only all year
024Zinc, potentially dissolvedDAILY MX report only all year
024Silver, potentially dissolved30DA AVG report only all year
024Silver, potentially dissolvedDAILY MX report only all year
024Copper, potentially dissolved30DA AVG report only all year
024Copper, potentially dissolvedDAILY MX report only all year
024Arsenic, potentially dissolvedDAILY MX report only all year
024Cadmium, potentially dissolvd30DA AVG report only all year
024Cadmium, potentially dissolvdDAILY MX report only all year
024Lead, potentially dissolvd30DA AVG report only all year
024Lead, potentially dissolvdDAILY MX report only all year
024Manganese, potentially dissolvd30DA AVG report only all year
024Manganese, potentially dissolvdDAILY MX report only all year
024Nickel, potentially dissolvd30DA AVG report only all year
024Nickel, potentially dissolvdDAILY MX report only all year
024Selenium, potentially dissolvd30DA AVG report only all year
024Selenium, potentially dissolvdDAILY MX report only all year
024Oil and greaseINST MAX <= 10 mg/L all year
024Chromium, trivalent total recoverableDAILY MX report only all year
024Flow, in conduit or thru treatment plant30DA AVG report only all year
024Flow, in conduit or thru treatment plantDAILY MX report only all year
024Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
024Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
024Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
024Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
024Solids, total dissolved30DA AVG report only all year
024Solids, total dissolvedDAILY MX report only all year
024Mercury, total [as Hg]30DA AVG report only all year
024Oil and grease visualINST MAX report only all year
024%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
024%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 18 % all year
024%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE report only all year
024%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE >= 18 % all year
FLOWFlow, in conduit or thru treatment plant30DA AVG <= 4.03 MGD all year
FLOWFlow, in conduit or thru treatment plantDAILY MX report only 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