Nassau Bay WWTP - Upper Bay
18920 Point Lookout, Nassau Bay, TX 77058 · Harris County · Publicly Owned Treatment Works
- Average flow
- 1.08 MGD
- Design flow
- 1.33 MGD
- NPDES permit
- TX0023833
- Effective
- Permit expires
- January 2030
- Population served
- 7,408
- CWNS 2022
Nassau Bay WWTP - Upper Bay is a publicly owned wastewater treatment works in Nassau Bay, Harris County, Texas treating an average of 1.08 million gallons per day against a permitted design capacity of 1.33 MGD, serving about 7,408 residents. It discharges under NPDES permit TX0023833 (effective), which expires in January 2030, with 4 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in July 2005.
Treatment technology
Treatment structures and unit processes at Nassau Bay WWTP - Upper Bay.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Nassau Bay WWTP - Upper Bay in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Compliance actions
- $1,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jul 2005
Nassau Bay, City of
Administrative order · SDWA, Intentional Acts · Unilateral Administrative Order Without Adjudication · Compliance actions $1,000
EPA's description of the case:
“Failed to submit vulnerability assessment report”
Source: EPA ECHO, civil enforcement case 06-2005-1350.
Full case history with a free Klarifi account
Every action against Nassau Bay WWTP - Upper Bay with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for Nassau Bay WWTP - Upper Bay, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Nassau Bay WWTP - Upper Bay, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Texas
League City · 1 mi away
12.64 MGD
Webster · 1 mi away
2.19 MGD
Houston · 3 mi away
9 MGD
El Lago · 4 mi away
0.61 MGD
Seabrook · 5 mi away
—
Kemah · 5 mi away
1.76 MGD
Houston · 5 mi away
9.87 MGD
Bacliff · 5 mi away
0.54 MGD
Nassau Bay WWTP - Upper Bay: 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 March 11, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms