HOUSTON, CITY OF

NPDES permit TX0063037 · Major POTW · effective, expires 2028-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

2values over a limit
0required values missing, on 0 form(s)
1of 16 forms filed late

Last period with anything received: 2026-07-31. Most often over: Enterococci (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 (51)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 4 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 <= 907 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY AV <= 5 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY AV <= 181 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY AV <= 302 lb/d Jan, Feb, Mar, Nov, Dec
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 <= 34722 gal/min all year
001Flow, in conduit or thru treatment plantANNL AVG <= 7.25 MGD all year
001Chlorine, total residualINST MAX < .1 mg/L all year
001Chlorine, total residualMO MIN >= 1 mg/L all year
001EnterococciDAILY AV <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 104 MPN/100mL all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 605 lb/d all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (M. bahia)7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (M. bahia)MO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TXAWhole effluent toxicity - retest #1SINGSAMP report only all year
TXAWhole effluent toxicity - retest #2SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Menidia menidiaSINGSAMP 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