MIDLAND, CITY OF

NPDES permit TX0138517 · Major NON-POTW · effective, expires 2031-05-29 · 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

2values over a limit
0required values missing, on 0 form(s)
6of 15 forms filed late

Last period with anything received: 2026-07-31. Most often over: E. coli (2).

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 (32)

OutfallParameterStatisticLimitMonths
002Oxygen, dissolved [DO]MO MIN >= 4 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 <= 1877 lb/d all year
002Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L all year
002Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L all year
002Nitrogen, ammonia total [as N]DAILY AV <= 375 lb/d 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 <= 30556 gal/min all year
002Flow, in conduit or thru treatment plantANNL AVG <= 15 MGD all year
002E. coliDAILY AV <= 126 CFU/100mL all year
002E. coliDAILY MX <= 399 CFU/100mL all year
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 10 mg/L all year
002BOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L all year
002BOD, carbonaceous [5 day, 20 C]DAILY AV <= 1251 lb/d all year
TX2Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX2Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexMO AV MN report only all year
TX2LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX2LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasMO AV MN report only all year
TX2NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48HR MIN report only all year
TX2NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexMO AV MN report only all year
TX2NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48HR MIN report only all year
TX2NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasMO AV MN report only all year
TX2LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex48HR MIN report only all year
TX2LOAEC Lethal Static Renewal 48HR Acute Daphnia pulexMO AV MN report only all year
TX2LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX2LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelasMO AV MN report only all year
TXBLC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXBLC50 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