DTT, LLC — NPDES permit TX0134601: limits, due date and EPA's record

Sewerage Systems, Brownwood, Texas. NPDES permit TX0134601 expired Mar 17, 2025; its limits still apply. Last 12 months: over a limit 4 times (last September 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	E. coli, daily average	411 CFU/100mL	≤ 126 CFU/100mL	226%
August 2026	Nitrogen, ammonia total [as N], daily average	9.44 mg/L	≤ 3 mg/L	215%
September 2026	Nitrogen, ammonia total [as N], daily average	5.47 mg/L	≤ 3 mg/L	82%
September 2026	Nitrogen, ammonia total [as N], single grab sample	15.2 mg/L	≤ 15 mg/L	1%

Limits in force (18)

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	≤ 1.5 lb/d	all year
Nitrogen, ammonia total [as N]	daily average	≤ 3 mg/L	all year
Nitrogen, ammonia total [as N]	single grab sample	≤ 15 mg/L	all year
Nitrogen, ammonia total [as N]	daily average	≤ .38 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .015 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	≤ 5 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	single grab sample	≤ 30 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ .63 lb/d	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0134601 · MCP: https://passage-data.com/mcp