Terra Nitrogen, L.P.- Verdigris

NPDES permit OK0029149 · Major NON-POTW · effective, expires 2028-11-30 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 32 forms filed late

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

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among OK permits in EPA's filings — check your permit).

Limits in force (71)

OutfallParameterStatisticLimitMonths
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX <= 35 mg/L all year
001Oil and grease, hexane extr methodMO AVG <= 7.5 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
001Oil and grease, hexane extr methodMO AVG <= 131 lb/d all year
001Oil and grease, hexane extr methodDAILY MX <= 261 lb/d all year
001Nitrogen, organic total [as N]MO AVG <= 14.9 mg/L all year
001Nitrogen, organic total [as N]MO AVG <= 7.1 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, organic total [as N]DAILY MX <= 30 mg/L all year
001Nitrogen, organic total [as N]DAILY MX <= 16 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, organic total [as N]MO AVG <= 200 lb/d all year
001Nitrogen, organic total [as N]MO AVG <= 95 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, organic total [as N]DAILY MX <= 400 lb/d all year
001Nitrogen, organic total [as N]DAILY MX <= 214 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 25.9 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 18.2 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 50.9 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 40.9 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 348 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 244 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 683 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 549 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, nitrate total [as N]MO AVG <= 41 mg/L all year
001Nitrogen, nitrate total [as N]DAILY MX <= 116 mg/L all year
001Nitrogen, nitrate total [as N]MO AVG <= 553 lb/d all year
001Nitrogen, nitrate total [as N]DAILY MX <= 1562 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 8 mg/L all year
001Phosphorus, total [as P]MO AVG <= 70 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 139 lb/d all year
001Oxidants, total residualINST MAX <= .099 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only Jun, Jul, Aug, Sep, Oct
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 Jun, Jul, Aug, Sep, Oct
TX1pHDAILY MN report only all year
TX1pHDAILY MN report only all year
TX1pHDAILY MX report only all year
TX1pHDAILY MX report only all year
TX1Nitrogen, ammonia total [as N]DAILY MN report only all year
TX1Nitrogen, ammonia total [as N]DAILY MN report only all year
TX1Nitrogen, ammonia total [as N]MO AVG report only all year
TX1Nitrogen, ammonia total [as N]MO AVG report only all year
TX1Nitrogen, ammonia total [as N]DAILY MX report only all year
TX1Nitrogen, ammonia total [as N]DAILY MX report only all year
TX1Whole effluent toxicity - retest #148HR MIN report only all year
TX1Whole effluent toxicity - retest #148HR MIN report only all year
TX1Whole effluent toxicity - retest #248HR MIN report only all year
TX1Whole effluent toxicity - retest #248HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1%Mortality Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX1% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48HR MIN report only all year
TX1%Mortality 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1%Mortality Static Renewal 7Day Chronic Pimephales Promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN 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