Fort Bend County Mud No. 190 — NPDES permit TX0129518: limits, due date and EPA's record

Sewage treatment plant, Fort Bend County, Texas. NPDES permit TX0129518, in force until Apr 23, 2031. Last 12 months: over a limit 4 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
February 2026	E. coli, daily average	186 CFU/100mL	≤ 63 CFU/100mL	195%
July 2026	Nitrogen, ammonia total [as N], daily average	< 2.12 mg/L	≤ 2 mg/L	6%
August 2026	Nitrogen, ammonia total [as N], daily average	2.33 mg/L	≤ 2 mg/L	17%
August 2026	Nitrogen, ammonia total [as N], single grab sample	19 mg/L	≤ 15 mg/L	27%

Limits in force (18)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	minimum	≥ 6 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 15 mg/L	all year
Solids, total suspended	single grab sample	≤ 60 mg/L	all year
Solids, total suspended	daily average	≤ 50 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	≤ 6.7 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .4 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	≤ 63 CFU/100mL	all year
E. coli	single grab sample	≤ 200 CFU/100mL	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 10 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	≤ 33 lb/d	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0129518 · MCP: https://passage-data.com/mcp