Quadvest LP — NPDES permit TX0138487: limits, due date and EPA's record

Sewerage Systems, Willis, Texas. NPDES permit TX0138487, in force until Feb 10, 2030. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
December 2025	Nitrogen, ammonia total [as N], daily average	2.46 mg/L	≤ 2 mg/L	23%
March 2026	Phosphorus, total [as P], daily average	1.045 mg/L	≤ 1 mg/L	5%

Limits in force (21)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	monthly minimum	≥ 4 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 12 mg/L	all year
Solids, total suspended	single grab sample	≤ 60 mg/L	all year
Solids, total suspended	daily average	≤ 13 lb/d	all year
Nitrogen, ammonia total [as N]	daily average	≤ 2 mg/L	all year
Nitrogen, ammonia total [as N]	single grab sample	≤ 15 mg/L	all year
Nitrogen, ammonia total [as N]	daily average	≤ 2.1 lb/d	all year
Phosphorus, total [as P]	daily average	≤ 1 mg/L	all year
Phosphorus, total [as P]	single grab sample	≤ 6 mg/L	all year
Phosphorus, total [as P]	daily average	≤ 1 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .125 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Chlorine, total residual	monthly minimum	≥ 1 mg/L	all year
Chlorine, total residual	monthly maximum	≤ 4 mg/L	all year
E. coli	daily average	≤ 126 CFU/100mL	all year
E. coli	single grab sample	≤ 399 CFU/100mL	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 7 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	single grab sample	≤ 35 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 7.3 lb/d	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0138487 · MCP: https://passage-data.com/mcp