Clean Water Act discharge permit · NPDES TX0075795
NORTHWEST HARRIS COUNTY MUD 15 WWTP, Tomball, TX: NPDES TX0075795 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 55Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
NORTHWEST HARRIS COUNTY MUD 15 WWTP, held by NORTHWEST HARRISCOUNTY MUD 15, holds NPDES permit TX0075795, which discharges to Hcfcdd K142-07-00, Faulkey Gully;Cypress Ck. EPA’s file records it issued July 12, 2018 and expiring July 12, 2023. 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 | NORTHWEST HARRIS COUNTY MUD 15 WWTP |
|---|---|
| Permittee as filed | NORTHWEST HARRISCOUNTY MUD 15 |
| NPDES ID | TX0075795 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 12, 2018 |
| Expiration date | July 12, 2023 |
| Address | Tomball, TX 77377 |
| Receiving water | HCFCDD K142-07-00, FAULKEY GULLY;CYPRESS CK |
| Subwatershed | Marshall Lake-Cypress Creek (HUC 120401020106) |
| 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
- 55Pollutants on file
- 55Under a numeric limit
- 34With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 6 | 33 | 24 | July 31, 2026 | 179% over the limit |
| Solids, total suspended | 3 | 19 | 7 | July 31, 2018 | 470% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 17 | 5 | May 31, 2011 | 108% over the limit |
| Oxygen, dissolved [DO] | 2 | 6 | 4 | October 31, 2017 | 33% over the limit |
| E. coli | 2 | 5 | 3 | April 30, 2012 | 511% over the limit |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 14 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 14 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 13 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 13 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 13 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 12 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 12 | 0 | ||
| Chlorine, total residual | 2 | 10 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 10 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 10 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 9 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 9 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 9 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 8 | 0 | ||
| pH | 3 | 6 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 5 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 5 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 2 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 2 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 2 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 1 | 0 | ||
| Annual amt of sludge incinerated | 1 | 1 | 0 | ||
| Annual sludge production, total | 1 | 1 | 0 | ||
| Annual amount of sludge land applied | 1 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 1 | 0 | ||
| Annual amt sludge transported interstate | 1 | 1 | 0 | ||
| Arsenic, dry weight | 5 | 0 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 0 | 0 | ||
| Selenium, dry weight | 3 | 0 | 0 | ||
| Copper, dry weight | 3 | 0 | 0 | ||
| Cadmium, dry weight | 3 | 0 | 0 | ||
| Solids, total dissolved | 3 | 0 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Level of pathogen requirements achieved | 2 | 0 | 0 | ||
| Description of pathogen option used | 2 | 0 | 0 | ||
| Vector attraction reduction alternative used | 2 | 0 | 0 | ||
| Fecal coliform | 1 | 0 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 0 | 0 | ||
| Boundary areas | 1 | 0 | 0 | ||
| Salmonella | 1 | 0 | 0 | ||
| Pollutant table from 503.13 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 24, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
| December 18, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| November 21, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| July 13, 2018 | 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.