City Of Mathis WWTF
1.25 Mi NW Of Intex Of Fmr 666 And Fmr 1068, Mathis, TX 78368 · San Patricio County · Publicly Owned Treatment Works
- Average flow
- 0.43 MGD
- Design flow
- 0.95 MGD
- NPDES permit
- TX0020419
- Effective
- Permit expires
- September 2030
- Population served
- 6,702
- CWNS 2022
City Of Mathis WWTF is a publicly owned wastewater treatment works in Mathis, San Patricio County, Texas treating an average of 0.43 million gallons per day against a permitted design capacity of 0.95 MGD, serving about 6,702 residents. It discharges under NPDES permit TX0020419 (effective), which expires in September 2030, with 2 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at City Of Mathis WWTF.
Available with a free Klarifi account
See the full treatment train at City Of Mathis WWTF: 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
Decision-makers at City Of Mathis WWTF.
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City Of Mathis WWTF: 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 January 27, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms