Walnut Branch WWTP
East Klein St & S. Austin St, Seguin, TX 78155 · Guadalupe County · Publicly Owned Treatment Works
- Average flow
- 3.68 MGD
- Design flow
- 4.9 MGD
- NPDES permit
- TX0022365
- Effective
- Permit expires
- June 2030
- Population served
- 21,124
- CWNS 2022
Walnut Branch WWTP is a publicly owned wastewater treatment works in Seguin, Guadalupe County, Texas treating an average of 3.68 million gallons per day against a permitted design capacity of 4.9 MGD, serving about 21,124 residents. It discharges under NPDES permit TX0022365 (effective), which expires in June 2030, with 2 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at Walnut Branch WWTP.
Available with a free Klarifi account
See the full treatment train at Walnut Branch WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
5 verified contacts for Walnut Branch WWTP, with validated emails and direct phone numbers.
Unlock 5 verified contacts (2 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Walnut Branch WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Texas
Seguin · 3 mi away
2.64 MGD
New Braunfels · 9 mi away
3.38 MGD
Seguin · 9 mi away
—
Seguin · 10 mi away
1.62 MGD
Marion · 10 mi away
0.13 MGD
New Braunfels · 12 mi away
4.62 MGD
New Braunfels · 12 mi away
3.2 MGD
New Braunfels · 14 mi away
2.12 MGD
Walnut Branch WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated September 14, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms