Clean Water Act discharge permit · NPDES TX0129577
HARRIS COUNTY MUD 477 WWTP, Hockley, TX: NPDES TX0129577 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 0Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
HARRIS COUNTY MUD 477 WWTP, held by HARRIS COUNTY MUD No. 477, holds NPDES permit TX0129577, which discharges to Hcfcd, Cypress Creek. EPA’s file records it issued March 14, 2018 and expiring February 1, 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 | HARRIS COUNTY MUD 477 WWTP |
|---|---|
| Permittee as filed | HARRIS COUNTY MUD No. 477 |
| NPDES ID | TX0129577 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | March 14, 2018 |
| Expiration date | February 1, 2023 |
| Address | Hockley, TX 77447 |
| Receiving water | HCFCD, CYPRESS CREEK |
| Subwatershed | Mallard Lake-Cypress Creek (HUC 120401020103) |
| 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
- 2Pollutants on file
- 0Under a numeric limit
- 2With a violation of any kind
- 2With 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] | 0 | 8 | 8 | May 31, 2026 | 187% over the limit |
| Solids, total suspended | 0 | 2 | 2 | June 30, 2026 | 85% over the limit |
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 |
|---|---|---|
| July 30, 2026 | 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.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0129577 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.