Clean Water Act discharge permit · NPDES TX0022365
WALNUT BRANCH WWTP, Seguin, TX: NPDES TX0022365 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
WALNUT BRANCH WWTP, held by SEGUIN, CITY OF, holds NPDES permit TX0022365, which discharges to Guadalupe River Below Comal River. EPA’s file records it issued March 11, 2020 and expiring March 11, 2025.
WALNUT BRANCH WWTP, Seguin, Texas: Individual permit TX0022365, held by SEGUIN, CITY OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued March 11, 2020, term to March 11, 2025; discharges to Guadalupe River Below Comal River.
- E. coli: 2 limits, 24 violations of any kind, 4 effluent exceedances, latest July 31, 2026, largest 1,103% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 52 violations of any kind, 3 effluent exceedances, latest May 31, 2003, largest 55% over the limit.
- Chlorine, total residual: 2 limits, 29 violations of any kind, 3 effluent exceedances, latest November 30, 2002, largest 920% over the limit.
- Nitrogen, ammonia total [as N]: 3 limits, 43 violations of any kind, 1 effluent exceedance, latest November 30, 2006, largest 29% over the limit.
- pH: 2 limits, 27 violations of any kind, 1 effluent exceedance, latest July 31, 2002.
- Flow, in conduit or thru treatment plant: 4 limits, 54 violations of any kind, 0 effluent exceedances.
- Solids, total suspended: 3 limits, 39 violations of any kind, 0 effluent exceedances.
- LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex: 2 limits, 29 violations of any kind, 0 effluent exceedances.
- NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex: 2 limits, 25 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas: 2 limits, 22 violations of any kind, 0 effluent exceedances.
- NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas: 2 limits, 22 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 3 limits, 14 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 3 limits, 14 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 1 limit, 14 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit, 9 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit, 9 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 0 limits, 6 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 0 limits, 4 violations of any kind, 0 effluent exceedances.
- Compliance w/part 258 sludge requirement: 0 limits, 3 violations of any kind, 0 effluent exceedances.
- Pollutant table from 503.13: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Ann. amt sludge disposed by other method: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 0 limits, 1 violation of any kind, 0 effluent exceedances.
- November 4, 2024: Permit Violations - Violation Specified in Comment (ST6).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 1,328 were issued before TX0022365. SEGUIN, CITY OF holds 3 permits in Texas.
Other permits held by SEGUIN, CITY OF
- SEGUIN WTP, Seguin: TX0002054, issued February 3, 2010
- GERONIMO CREEK WWTP, Seguin: TX0103535, issued June 4, 2020
Coverages issued nearest TX0022365
- March 3, 2020: EAST BASTROP WWTP, Bastrop, TX0032671, held by BASTROP, CITY OF
- March 3, 2020: SOMERSET WWTP, Somerset, TX0074331, held by SOMERSET, CITY OF
- March 3, 2020: GENERATION PARK MANAGEMENT DISTRICT WWTF, Houston, TX0127981, held by GENERATION PARK MANAGEMENT DISTRICT
- March 3, 2020: CASTLETOP CAPITAL HAYS ABC WWTP, Hays County, TX0128201, held by NORTH HAYS COUNTY MUD 1
- March 9, 2020: CITY OF BRIDGEPORT WWTP, Bridge City, TX0132411, held by BRIDGEPORT, CITY OF
- March 11, 2020: CITY OF BRAZORIA WWTP, Brazoria, TX0025615, held by BRAZORIA, CITY OF
- March 11, 2020: SEADRIFT WWTP, Seadrift, TX0026671, held by SEADRIFT, CITY OF
- March 11, 2020: CITY OF SOUTH HOUSTON WWTP, South Houston, TX0057304, held by SOUTH HOUSTON, CITY OF
- March 11, 2020: BRUSHY WEST REGIONAL WWTP, Round Rock, TX0075167, held by ROUND ROCK, CEDAR PARK, LEANDER, AUSTIN, OF CITIES
- March 11, 2020: CITY OF OGLESBY WWTP, Oglesby, TX0100854, held by OGLESBY, CITY OF
WALNUT BRANCH WWTP among its neighbors
Its county holds 328, 3 of them major permits; TX0022365 is a major permit.
Other permits in the county
- 2X WORLDWIDE WRRF, Kingsbury: TX0148059, not classed
- 3W MATERIALS PLANT, Seguin: TXR05GT55, minor permit, permit term to August 13, 2026
- ACKERMANN SUBDIVISION, Schertz: TXR1529QF, minor permit, discharging to UNNAMED TRIBUTARY, permit term to March 4, 2028
- ALTEC SERVICE CENTER, Cibolo: TXR1526RF, minor permit, discharging to MID CIBOLO CREEK, permit term to March 4, 2028
- AMAZON COM SERVICES SAT1, Schertz: TXR05FD65, minor permit, permit term to August 13, 2026
- AMAZONCOM SERVICES SAT1, Schertz: TXR05FT28, minor permit, permit term to August 13, 2026
- APACHE DISPOSAL, Marion: TXR05Y622, minor permit, permit term to August 13, 2026
- APPLEWHITE CATTLE CO, Seguin: TXR05GL75, minor permit, permit term to August 13, 2026
- ARMORTEX, Schertz: TXR05GD49, minor permit, permit term to August 13, 2026
- ARROYO RANCH, Seguin: TXR1585RX, minor permit, discharging to GUADALUPE RIVER BELOW COMAL RIVER, permit term to March 4, 2028
Identity
| Facility as filed | WALNUT BRANCH WWTP |
|---|---|
| Permittee as filed | SEGUIN, CITY OF |
| NPDES ID | TX0022365 |
| 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 | March 11, 2020 |
| Expiration date | March 11, 2025 |
| Address | Seguin, TX 78155 |
| Receiving water | Guadalupe River Below Comal River |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 37Pollutants on file
- 18Under a numeric limit
- 37With 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 |
|---|---|---|---|---|---|
| E. coli | 2 | 24 | 4 | July 31, 2026 | 1,103% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 52 | 3 | May 31, 2003 | 55% over the limit |
| Chlorine, total residual | 2 | 29 | 3 | November 30, 2002 | 920% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 43 | 1 | November 30, 2006 | 29% over the limit |
| pH | 2 | 27 | 1 | July 31, 2002 | |
| Flow, in conduit or thru treatment plant | 4 | 54 | 0 | ||
| Solids, total suspended | 3 | 39 | 0 | ||
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | 2 | 29 | 0 | ||
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 2 | 25 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 2 | 24 | 0 | ||
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | 2 | 24 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 2 | 22 | 0 | ||
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 2 | 22 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 14 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 14 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 14 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 9 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 9 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 0 | 6 | 0 | ||
| Arsenic, dry weight | 0 | 5 | 0 | ||
| Selenium, dry weight | 0 | 5 | 0 | ||
| Copper, dry weight | 0 | 5 | 0 | ||
| Cadmium, dry weight | 0 | 5 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 0 | 5 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 0 | 5 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 0 | 5 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 0 | 5 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 0 | 5 | 0 | ||
| Toxicity characteristic leaching procedure | 0 | 4 | 0 | ||
| Compliance w/part 258 sludge requirement | 0 | 3 | 0 | ||
| Pollutant table from 503.13 | 0 | 2 | 0 | ||
| Level of pathogen requirements achieved | 0 | 2 | 0 | ||
| Description of pathogen option used | 0 | 2 | 0 | ||
| Vector attraction reduction alternative used | 0 | 2 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 0 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 0 | 1 | 0 | ||
| Annual amt of sludge incinerated | 0 | 1 | 0 |
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| November 4, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES TX0022365.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES TX0022365.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.