Clean Water Act discharge permit · NPDES TX0071978
SAN LEON MUD WWTP, San Leon, TX: NPDES TX0071978 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 53Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
SAN LEON MUD WWTP, held by SAN LEON MUD, holds NPDES permit TX0071978, which discharges to Salt Bayou; Lower Galveston Bay. EPA’s file records it issued May 13, 2019 and expiring May 13, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SAN LEON MUD WWTP |
|---|---|
| Permittee as filed | SAN LEON MUD |
| NPDES ID | TX0071978 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 13, 2019 |
| Expiration date | May 13, 2024 |
| Address | San Leon, TX 77539 |
| Receiving water | SALT BAYOU; LOWER GALVESTON BAY |
| Subwatershed | Dickinson Bayou (HUC 120402040200) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 53Pollutants on file
- 53Under a numeric limit
- 36With a violation of any kind
- 6With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 6 | 67 | 41 | October 31, 2021 | 110,637% over the limit |
| Enterococci | 4 | 26 | 12 | March 31, 2026 | 1,077% over the limit |
| Solids, total suspended | 6 | 43 | 7 | March 31, 2015 | 800% over the limit |
| Chlorine, total residual | 4 | 45 | 5 | June 30, 2021 | 30% over the limit |
| pH | 5 | 28 | 1 | July 31, 2012 | |
| Oxygen, dissolved [DO] | 2 | 11 | 1 | September 30, 2004 | 5% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 39 | 0 | ||
| Arsenic, dry weight | 5 | 32 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 32 | 0 | ||
| Selenium, dry weight | 3 | 18 | 0 | ||
| Copper, dry weight | 3 | 18 | 0 | ||
| Cadmium, dry weight | 3 | 18 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 18 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 18 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 18 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 18 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 18 | 0 | ||
| Nickel, total [as Ni] | 2 | 14 | 0 | ||
| Level of pathogen requirements achieved | 2 | 13 | 0 | ||
| Description of pathogen option used | 2 | 13 | 0 | ||
| Vector attraction reduction alternative used | 2 | 13 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 7 | 0 | ||
| Boundary areas | 1 | 7 | 0 | ||
| Fecal coliform | 1 | 6 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 6 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 6 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 6 | 0 | ||
| Annual amt of sludge incinerated | 1 | 6 | 0 | ||
| Annual sludge production, total | 1 | 6 | 0 | ||
| Annual amount of sludge land applied | 1 | 6 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 6 | 0 | ||
| Annual amt sludge transported interstate | 1 | 6 | 0 | ||
| Salmonella | 1 | 6 | 0 | ||
| Pollutant table from 503.13 | 1 | 6 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 5 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 4 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 2 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 0 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 0 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 2 | 0 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 2 | 0 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Menidia menidia | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 24, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.