South Laredo WWTP
309 River Front St, Laredo, TX 78046 · Webb County · Publicly Owned Treatment Works
- Average flow
- 10.86 MGD
- Design flow
- 18 MGD
- NPDES permit
- TX0085316
- Effective
- Permit expires
- June 2031
- Population served
- 263,966
- CWNS 2022
South Laredo WWTP is a publicly owned wastewater treatment works in Laredo, Webb County, Texas treating an average of 10.86 million gallons per day against a permitted design capacity of 18 MGD, serving about 263,966 residents. It discharges under NPDES permit TX0085316 (effective), which expires in June 2031, with 2 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at South Laredo WWTP.
Available with a free Klarifi account
See the full treatment train at South Laredo 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.
Capital improvement projects in Laredo
Laredo's capital improvement plan lists 74 water, sewer and wastewater line items worth $846M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Laredo →
| Project | Budget | Years |
|---|---|---|
| South Laredo WWTP exp to 24 mgd | $138,000,000 | 2027–2028 |
| NLWWTP 3 MGD Expansion-District 6 | $74,750,000 | 2027–2029 |
| Zacate Creek WWTP Reconstruction | $44,300,000 | 2027–2029 |
| Expansion of North Laredo WWTP | $44,300,000 | 2027–2029 |
| Manadas Expansion to 9.5 MGD | $43,500,000 | 2027–2028 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at South Laredo WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Texas
Laredo · 4 mi away
10.77 MGD
Laredo · 5 mi away
0.38 MGD
Laredo · 6 mi away
0.05 MGD
Laredo · 10 mi away
2.09 MGD
Laredo · 18 mi away
0.23 MGD
Laredo · 23 mi away
0.01 MGD
Zapata · 41 mi away
0.56 MGD
Zapata · 51 mi away
0.0055 MGD
South Laredo 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 5, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms