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Waller County Mud 9A and Quadvest LP

Sewerage Systems, Katy, Texas. NPDES permit TX0132063, in force until Nov 21, 2027. Last 12 months: over a limit 14 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Renewal application due
May 25, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
October 2025Flow, in conduit or thru treatment plant, daily average.127 MGD≤ .125 MGD2%
November 2025Flow, in conduit or thru treatment plant, daily average.133 MGD≤ .125 MGD6%
December 2025Flow, in conduit or thru treatment plant, daily average.129 MGD≤ .125 MGD3%
December 2025Nitrogen, ammonia total [as N], daily average2.674 lb/d≤ 2.1 lb/d27%
January 2026Flow, in conduit or thru treatment plant, daily average.135 MGD≤ .125 MGD8%
February 2026Flow, in conduit or thru treatment plant, daily average.132 MGD≤ .125 MGD6%
March 2026Flow, in conduit or thru treatment plant, daily average.134 MGD≤ .125 MGD7%
April 2026Flow, in conduit or thru treatment plant, daily average.144 MGD≤ .125 MGD15%
May 2026Flow, in conduit or thru treatment plant, daily average.146 MGD≤ .125 MGD17%
June 2026Flow, in conduit or thru treatment plant, daily average.157 MGD≤ .125 MGD26%
July 2026Flow, in conduit or thru treatment plant, daily average.15 MGD≤ .125 MGD20%
July 2026Nitrogen, ammonia total [as N], daily average2.92 lb/d≤ 2.1 lb/d39%
July 2026Nitrogen, ammonia total [as N], daily average4.67 mg/L≤ 2 mg/L134%
August 2026Flow, in conduit or thru treatment plant, daily average.143 MGD≤ .125 MGD14%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 6 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≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 2.1 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 MPN/100mLall year
E. colisingle grab sample≤ 200 MPN/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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0132063 · MCP: https://passage-data.com/mcp