Timber Branch Ii STP
Mandeville, LA · St. Tammany County · Publicly Owned Treatment Works
- Average flow
- 0.3 MGD
- Design flow
- 0.7 MGD
- NPDES permit
- LA0122645
- Administratively continued
- Permit expires
- October 2024
- Population served
- —
- CWNS 2022
Timber Branch Ii STP is a publicly owned wastewater treatment works in Mandeville, St. Tammany County, Louisiana treating an average of 0.3 million gallons per day against a permitted design capacity of 0.7 MGD. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit LA0122645 (administratively continued), which expires in October 2024, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Timber Branch Ii STP.
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Nearby wastewater treatment plants in Louisiana
Covington · 3 mi away
0.13 MGD
Mandeville · 3 mi away
0.37 MGD
Madisonville · 3 mi away
0.2 MGD
Covington · 3 mi away
0.12 MGD
Madisonville · 4 mi away
0.06 MGD
Mandeville · 5 mi away
0.48 MGD
Mandeville · 5 mi away
0.04 MGD
Mandeville · 7 mi away
0.03 MGD
Timber Branch Ii STP: 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 September 11, 2026; facility record last updated March 9, 2025.