MARLIN, CITY OF

NPDES permit TX0021725 · Major POTW · expired 2024-02-11 · EPA's file as of 2026-09-26

Keep this permit as a site — opens New site at EPA's facility point (31.261944, -96.925556); you set the radius.

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.

These are the last limits EPA's file holds for this permit, from an earlier version of it (version 0 in EPA's file): its current version carries none yet. Read your permit: a renewal can change them.

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

20values over a limit
0required values missing, on 0 form(s)
2of 11 forms filed late

Last period with anything received: 2026-03-31. Most often over: E. coli (8), BOD, 5-day, 20 deg. C (6), pH (4).

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).

How strict are these limits?

Each concentration limit against the same limit in comparable permits. Where it appears more than once, its strictest value.

Limits in force (45)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]monthly minimum >= 4 mg/L all year
001BOD, 5-day, 20 deg. Cdaily average <= 30 mg/L all year
001BOD, 5-day, 20 deg. Cdaily maximum <= 70 mg/L all year
001BOD, 5-day, 20 deg. Cdaily average <= 500 lb/d all year
001pHminimum >= 6.5 SU all year
001pHmaximum <= 9 SU all year
001Solids, total suspendeddaily average <= 90 mg/L all year
001Solids, total suspendeddaily average <= 1501 lb/d all year
001Flow, in conduit or thru treatment plantdaily average report only all year
001Flow, in conduit or thru treatment plantdaily maximum report only all year
001Flow, in conduit or thru treatment plantannual average <= 2 MGD all year
001E. colidaily average <= 126 CFU/100mL all year
001E. colidaily maximum <= 399 CFU/100mL all year
TX1Whole effluent toxicity - retest #17-day minimum report only all year
TX1Whole effluent toxicity - retest #1monthly average minimum report only all year
TX1Whole effluent toxicity - retest #27-day minimum report only all year
TX1Whole effluent toxicity - retest #2monthly average minimum report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimum report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimum report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimum report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimum report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimum report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimum report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7-day minimum report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasmonthly average minimum report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7-day minimum report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimum report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimum report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimum report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7-day minimum report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimum report only all year
TXAWhole effluent toxicity - retest #1single sample report only all year
TXAWhole effluent toxicity - retest #2single sample report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. Pulexsingle sample report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle sample 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