Terra International (Oklahoma) -Woodward

NPDES permit OK0036161 · Major NON-POTW · effective, expires 2026-09-30 · 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 31 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 (83)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 4 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]MO MIN >= 2 mg/L Jan, Feb, Mar, Nov, Dec
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 227.7 lb/d all year
001Solids, total suspendedDAILY MX <= 354.7 lb/d all year
001Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
001Oil and grease, hexane extr methodMO AVG <= 78.8 lb/d all year
001Oil and grease, hexane extr methodDAILY MX <= 118.2 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 9.6 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 16.5 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 77.5 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 130 lb/d all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG <= 30 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 40 lb/d all year
001Selenium, total [as Se]MO AVG <= 6.4 ug/L all year
001Selenium, total [as Se]DAILY MX <= 15.6 ug/L all year
001Selenium, total [as Se]MO AVG <= .06 lb/d all year
001Selenium, total [as Se]DAILY MX <= .12 lb/d all year
001Oxidants, total residualDAILY MX <= .099 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Solids, total dissolvedMO AVG <= 2079 mg/L all year
001Solids, total dissolvedDAILY MX <= 2338 mg/L all year
001Solids, total dissolvedMO AVG <= 16385 lb/d all year
001Solids, total dissolvedDAILY MX <= 18426 lb/d all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 40 mg/L Apr, May
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 36 mg/L Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 44 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 60 mg/L Apr, May
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 54 mg/L Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 66 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 315.3 lb/d Apr, May
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 283.7 lb/d Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 346.8 lb/d Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 472.9 lb/d Apr, May
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 425.6 lb/d Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 520.2 lb/d Jan, Feb, Mar, Nov, Dec
002Oxygen demand, chem. [high level] [COD]MO AVG <= 84 mg/L all year
002Oxygen demand, chem. [high level] [COD]DAILY MX <= 125 mg/L all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
002Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
002Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L all year
002Nitrogen, ammonia total [as N]DAILY MX <= 2.5 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1pHDAILY MN 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]MO AVG report only all year
TX1Nitrogen, ammonia total [as N]DAILY MX report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #148HR MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #248HR MIN report only all year
TX1Solids, total dissolved- 180 deg. CDAILY MN report only all year
TX1Solids, total dissolved- 180 deg. CMO AVG report only all year
TX1Solids, total dissolved- 180 deg. CDAILY MX 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