Union Pacific Railroad Company

NPDES permit WY0032590 · Major NON-POTW · effective, expires 2030-07-31 · 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.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 36 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 WY permits in EPA's filings — check your permit).

Limits in force (32)

OutfallParameterStatisticLimitMonths
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Arsenic, total recoverableDAILY MX <= 20 ug/L all year
001Arsenic, total recoverableDAILY MX <= 20 ug/L all year
001PentachlorophenolDAILY MX <= 1 ug/L all year
001PentachlorophenolDAILY MX <= 1 ug/L all year
001Solids, total dissolvedDAILY MX <= 9600 mg/L all year
001FlowDAILY MX report only all year
001FlowDAILY MX report only all year
001FlowMO AVG report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001FlowDAILY MX report only all year
001FlowVALUE <= .11 gal/d all year
001FlowVALUE <= .11 gal/d all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7E <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7E <= 0 pass=0;fail=1 all year
002pHINST MIN >= 6.5 SU all year
002pHINST MAX <= 9 SU all year
002Arsenic, total recoverableDAILY MX <= 20 ug/L all year
002Arsenic, total recoverableDAILY MX <= 20 ug/L all year
002PentachlorophenolDAILY MX <= 1 ug/L all year
002PentachlorophenolDAILY MX <= 1 ug/L all year
002Solids, total dissolvedDAILY MX <= 9600 mg/L all year
002FlowDAILY MX report only all year
002FlowDAILY MX report only all year
002FlowMO AVG report only all year
002FlowMO AVG report only all year
002FlowDAILY MX report only all year
002FlowDAILY MX report only all year
002Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7E <= 0 pass=0;fail=1 all year
002Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7E <= 0 pass=0;fail=1 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