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Quadvest, LP

Sewerage Systems, City Of Tomball, Texas. NPDES permit TX0139327 expired Jan 6, 2025; its limits still apply. Last 12 months: over a limit 8 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (21 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025Phosphorus, total [as P], daily average1.24 mg/L≤ 1 mg/L24%
December 2025Phosphorus, total [as P], daily average1.8 mg/L≤ 1 mg/L80%
January 2026Phosphorus, total [as P], daily average1.16 mg/L≤ 1 mg/L16%
June 2026E. coli, single grab sample613 CFU/100mL≤ 200 CFU/100mL207%
June 2026Flow, in conduit or thru treatment plant, daily average.12527 MGD≤ .125 MGD0%
August 2026Flow, in conduit or thru treatment plant, daily average.13381 MGD≤ .125 MGD7%
August 2026Nitrogen, ammonia total [as N], daily average3.68 mg/L≤ 3 mg/L23%
August 2026Nitrogen, ammonia total [as N], daily average3.98 lb/d≤ 3.1 lb/d28%

Limits in force (21)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendedsingle grab sample≤ 60 mg/Lall year
Solids, total suspendeddaily average≤ 16 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 3.1 lb/dall year
Phosphorus, total [as P]daily average≤ 1 mg/Lall year
Phosphorus, total [as P]single grab sample≤ 6 mg/Lall year
Phosphorus, total [as P]daily average≤ 1 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .125 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 63 CFU/100mLall year
E. colisingle grab sample≤ 200 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 35 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 lb/dall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0139327 · MCP: https://passage-data.com/mcp