Union Pacific Railroad

NPDES permit CO0047554 · Minor NON-POTW · administratively continued, expires 2023-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2023-09-30 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

13values over a limit
0required values missing, on 0 form(s)
2of 30 forms filed late

Last period with anything received: 2026-07-31. Most often over: Turbidity (11), pH (2).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (77)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Turbidity30DA AVG report only all year
001TurbidityDAILY MX 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
001Bicarbonate ion- [as HCO3]DAILY MX report only all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Cyanide, weak acid, dissociableROLL AVG <= 3.6 ug/L all year
001Calcium, total recoverable30DA AVG report only all year
001Calcium, total recoverableDAILY MX report only all year
001Magnesium, total recoverable30DA AVG report only all year
001Magnesium, total recoverableDAILY MX report only all year
001Sodium, total recoverable30DA AVG report only all year
001Sodium, total recoverableDAILY MX report only all year
001Sodium adsorption ratio30DA AVG report only all year
001Sodium adsorption ratioDAILY MX report only all year
001Sodium adsorption ratio30DA AVG report only all year
001Sodium adsorption ratioDAILY MX report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG <= 3100 ug/L all year
001Iron, dissolved [as Fe]30DA AVG <= 962 ug/L all year
001Manganese, dissolved [as Mn]30DA AVG <= 182 ug/L all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Aluminum, total recoverableROLL AVG report only all year
001Molybdenum, total recoverable30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]ROLL AVG <= 9.2 ug/L all year
001Zinc, potentially dissolved30DA AVG <= 49 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 267 ug/L all year
001Silver, potentially dissolved30DA AVG report only all year
001Silver, potentially dissolved30DA AVG <= .06 ug/L all year
001Silver, potentially dissolvedDAILY MX report only all year
001Silver, potentially dissolvedDAILY MX <= 1.4 ug/L all year
001Silver, potentially dissolvedROLL AVG report only all year
001Silver, potentially dissolved30DA AVG <= .0053 ug/L all year
001Copper, potentially dissolved30DA AVG <= 7 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 12 ug/L all year
001Cadmium, potentially dissolvd30DA AVG <= 1 ug/L all year
001Cadmium, potentially dissolvdDAILY MX report only all year
001Cadmium, potentially dissolvdROLL AVG report only all year
001Cadmium, potentially dissolvdROLL AVG <= .7 ug/L all year
001Chromium, trivalent, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG <= 3.7 ug/L all year
001Lead, potentially dissolvdDAILY MX <= 90 ug/L all year
001Nickel, potentially dissolvd30DA AVG report only all year
001Nickel, potentially dissolvdROLL AVG report only all year
001Selenium, potentially dissolvd30DA AVG report only all year
001Selenium, potentially dissolvdROLL AVG report only all year
001Selenium, potentially dissolvdROLL AVG <= 3.5 ug/L all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Chromium, trivalent total recoverableDAILY MX report only all year
001Uranium, totalDAILY MX <= 91 ug/L all year
001Diesel range organics diesel, total, wtr30DA AVG report only all year
001Flow, in conduit or thru treatment plant30DA AVG <= .5 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total [as Hg]30DA AVG <= .05 ug/L all year
001Mercury, total [as Hg]ROLL AVG report only all year
001Mercury, total [as Hg]ROLL AVG <= .018 ug/L all year
001Hydrocarbons, total petroleum30DA AVG report only all year
001Oil and grease visualINST MAX 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 >= 34 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 >= 34 tox chronic all year
300TurbidityDAILY MX <= 175 NTU 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