CF&I Steel LP dba Rocky Mountain Steel Mills

NPDES permit CO0000621 · Major NON-POTW · administratively continued, expires 2016-03-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2016-03-31 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 45 forms filed late

Last period with anything received: 2026-07-31.

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 (72)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigrade30DA AVG report only all year
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeMX 7D AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Conductivity30DA AVG report only all year
001ConductivityDAILY MX report only all year
001Sulfate [as S]30DA AVG report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Bicarbonate ion- [as HCO3]30DA AVG report only all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspended30DA AVG <= 1299 lb/d all year
001Solids, total suspendedDAILY MX <= 3527 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Calcium, dissolved [as Ca]30DA AVG report only all year
001Magnesium, dissolved [as Mg]30DA AVG report only all year
001Sodium, dissolved [as Na]30DA AVG report only all year
001Cadmium, dissolved [as Cd]30DA AVG report only all year
001Cadmium, dissolved [as Cd]DAILY MX report only all year
001Lead, total [as Pb]30DA AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]30DA AVG <= 1.861 lb/d all year
001Lead, total [as Pb]DAILY MX <= 6.743 lb/d all year
001Zinc, total [as Zn]30DA AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Zinc, total [as Zn]30DA AVG <= 10.39 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 39.29 lb/d all year
001Selenium, potentially dissolvd30DA AVG report only all year
001Selenium, potentially dissolvdDAILY MX report only all year
001Oil and grease30DA AVG report only all year
001Oil and grease30DA AVG report only all year
001Oil and greaseDAILY MX report only all year
001Oil and greaseDAILY MX report only all year
001Oil and grease30DA AVG <= 64 lb/d all year
001Oil and greaseDAILY MX <= 2460 lb/d all year
001Flow, in conduit or thru treatment plant30DA AVG <= 57 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001E. coli30DA AVG <= 141 #/100mL all year
001E. coliMX 7D AV <= 282 #/100mL all year
001Cyanide, free availableDAILY MX report only all year
001Sodium Absorption Ratio30DA AVG report only all year
001Sodium Absorption Ratio30DA AVG report only all year
001Sodium Absorption Ratio30DA AVG report only all year
001Mercury, total [as Hg]30DA AVG report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 48 tox chronic all year
001Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 48 tox chronic all year
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
002BOD, 5-day, 20 deg. C30DA AVG <= 250.2 lb/d all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 375.3 lb/d all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspended30DA AVG <= 30 mg/L all year
002Solids, total suspendedMX 7D AV <= 45 mg/L all year
002Solids, total suspended30DA AVG <= 250.2 lb/d all year
002Solids, total suspendedMX 7D AV <= 375.3 lb/d all year
002Oil and greaseINST MAX <= 10 mg/L all year
002Oil and grease visualINST MAX report only all year
300Solids, total suspended30DA AVG report only all year
300Solids, total suspendedDAILY MX report only all year
300Lead, total [as Pb]30DA AVG report only all year
300Lead, total [as Pb]DAILY MX report only all year
300Zinc, total [as Zn]30DA AVG report only all year
300Zinc, total [as Zn]DAILY MX report only all year
300Oil and grease30DA AVG report only all year
300Oil and greaseDAILY 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