Harris County Wcid 99 WWTP
18603 Casper Dr, Spring, TX 77373 · Harris County · Publicly Owned Treatment Works
- Average flow
- 0.42 MGD
- Design flow
- 0.29 MGD
- NPDES permit
- TX0046736
- Effective
- Permit expires
- November 2028
- Population served
- 1,597
- CWNS 2022
Harris County Wcid 99 WWTP is a publicly owned wastewater treatment works in Spring, Harris County, Texas treating an average of 0.42 million gallons per day against a permitted design capacity of 0.29 MGD, serving about 1,597 residents. It discharges under NPDES permit TX0046736 (effective), which expires in November 2028, with 2 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Harris County Wcid 99 WWTP.
Available with a free Klarifi account
See the full treatment train at Harris County Wcid 99 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
Decision-makers at Harris County Wcid 99 WWTP.
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Nearby wastewater treatment plants in Texas
Houston · 1 mi away
0.68 MGD
Houston · 1 mi away
0.38 MGD
Houston · 1 mi away
0.35 MGD
Spring · 1 mi away
1.02 MGD
Houston · 1 mi away
1.43 MGD
Houston · 1 mi away
0.46 MGD
Houston · 2 mi away
2.57 MGD
Houston · 2 mi away
0.39 MGD
Harris County Wcid 99 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 11, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms