Clean Water Act discharge permit · NPDES TX0127876
SIENNA REGIONAL WWTP, Missouri City, TX: NPDES TX0127876 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 0Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
SIENNA REGIONAL WWTP, held by SIENNA PLANTATION MUD NO 1, holds NPDES permit TX0127876, which discharges to Sienna Plantation Levee Id Channel. EPA’s file records it issued December 2, 2015 and expiring July 1, 2019. 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 | SIENNA REGIONAL WWTP |
|---|---|
| Permittee as filed | SIENNA PLANTATION MUD NO 1 |
| NPDES ID | TX0127876 |
| 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 |
| Program | Publicly owned treatment works |
| Issued | December 2, 2015 |
| Expiration date | July 1, 2019 |
| Address | Missouri City, TX 77459 |
| Receiving water | SIENNA PLANTATION LEVEE ID CHANNEL |
| Subwatershed | Middle Oyster Creek (HUC 120402050200) |
| 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
- 3Pollutants on file
- 0Under a numeric limit
- 3With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| E. coli | 0 | 8 | 8 | February 28, 2026 | 1,113% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 3 | 3 | February 29, 2024 | 56% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 0 | 1 | 1 | March 31, 2026 | 8% 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 4, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
| October 18, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| November 16, 2021 | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, TX0127876.
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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 TX0127876 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.