TRINITY RIVER AUTHORITY OF TEXAS

NPDES permit TX0104957 · Major POTW · effective, expires 2029-04-24 · 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
8required values missing, on 1 form(s)
1of 40 forms filed late

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

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (76)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 6 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV <= 15 mg/L all year
001Solids, total suspendedDAILY MX <= 40 mg/L all year
001Solids, total suspendedDAILY AV <= 588 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 1.4 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY AV <= 1.6 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY AV <= 55 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY AV <= 63 lb/d Jan, Feb, Mar, Apr, May, Nov, Dec
001Phosphorus, total [as P]DAILY AV report only all year
001Phosphorus, total [as P]DAILY MX <= 2 mg/L all year
001Phosphorus, total [as P]DAILY AV <= 7153.64 lb/yr all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plant2P <= 19444 gal/min all year
001Flow, in conduit or thru treatment plantANNL AVG <= 4.7 MGD all year
001E. coliDAILY AV <= 126 CFU/100mL all year
001E. coliDAILY MX <= 399 CFU/100mL all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 5 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 196 lb/d all year
002Oxygen, dissolved [DO]MO MIN >= 6 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedDAILY AV <= 15 mg/L all year
002Solids, total suspendedDAILY MX <= 40 mg/L all year
002Solids, total suspendedDAILY AV <= 1439 lb/d all year
002Nitrogen, ammonia total [as N]DAILY AV <= 2 mg/L Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
002Nitrogen, ammonia total [as N]DAILY AV <= 192 lb/d Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]DAILY AV <= 288 lb/d Jan, Feb, Mar, Apr, May, Nov, Dec
002Phosphorus, total [as P]DAILY AV report only all year
002Phosphorus, total [as P]DAILY MX <= 2 mg/L all year
002Phosphorus, total [as P]DAILY AV <= 17503.6 lb/yr all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plant2P <= 17361 gal/min all year
002Flow, in conduit or thru treatment plantANNL AVG <= 11.5 MGD all year
002E. coliDAILY AV <= 126 MPN/100mL all year
002E. coliDAILY MX <= 399 MPN/100mL all year
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 7 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 5 mg/L Jun, Jul, Aug, Sep, Oct
002BOD, carbonaceous [5 day, 20 C]DAILY MX <= 22 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
002BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L Jun, Jul, Aug, Sep, Oct
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 671 lb/d Jan, Feb, Mar, Apr, May, Nov, Dec
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 480 lb/d Jun, Jul, Aug, Sep, Oct
101Solids, total suspendedDAILY AV <= 1439 lb/d all year
101Nitrogen, ammonia total [as N]DAILY AV <= 288 lb/d Jan, Feb, Mar, Apr, May, Nov, Dec
101Nitrogen, ammonia total [as N]DAILY AV <= 192 lb/d Jun, Jul, Aug, Sep, Oct
101Flow, in conduit or thru treatment plantANNL AVG <= 11.5 MGD all year
101Flow, in conduit or thru treatment plant2P <= 28 MGD all year
101BOD, carbonaceous [5 day, 20 C]DAILY AV <= 671 lb/d Jan, Feb, Mar, Apr, May, Nov, Dec
101BOD, carbonaceous [5 day, 20 C]DAILY AV <= 480 lb/d Jun, Jul, Aug, Sep, Oct
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelasSINGSAMP 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