Troy, City of — NPDES permit TX0139815: limits, due date and EPA's record

Troy, City of

Sewage treatment plant, Troy, Texas. NPDES permit TX0139815 expired Apr 8, 2026; its limits still apply. Last 12 months: over a limit 14 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 20 days after each period: form A monthly (18 values)

Last report on file

September 2026

Oct 2024 – Sep 2025

30 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 ending	Parameter	Reported	Limit	Over by
October 2025	Nitrogen, ammonia total [as N], daily average	3.566 mg/L	≤ 3 mg/L	19%
December 2025	Nitrogen, ammonia total [as N], daily average	3.504 mg/L	≤ 3 mg/L	17%
March 2026	Nitrogen, ammonia total [as N], daily average	3.745 mg/L	≤ 3 mg/L	25%
March 2026	Nitrogen, ammonia total [as N], daily average	8.576 lb/d	≤ 7.7 lb/d	11%
April 2026	Nitrogen, ammonia total [as N], daily average	14.122 lb/d	≤ 7.7 lb/d	83%
April 2026	Nitrogen, ammonia total [as N], daily average	8.73 mg/L	≤ 3 mg/L	191%
April 2026	Nitrogen, ammonia total [as N], single grab sample	17.6 mg/L	≤ 15 mg/L	17%
June 2026	Flow, in conduit or thru treatment plant, daily average	.315 MGD	≤ .309 MGD	2%
July 2026	Nitrogen, ammonia total [as N], daily average	11.41 lb/d	≤ 7.7 lb/d	48%
July 2026	Nitrogen, ammonia total [as N], daily average	7.74 mg/L	≤ 3 mg/L	158%
July 2026	Nitrogen, ammonia total [as N], single grab sample	22 mg/L	≤ 15 mg/L	47%
August 2026	Nitrogen, ammonia total [as N], daily average	4.83 mg/L	≤ 3 mg/L	61%
September 2026	Nitrogen, ammonia total [as N], daily average	6.12 mg/L	≤ 3 mg/L	104%
September 2026	Nitrogen, ammonia total [as N], daily average	7.8 lb/d	≤ 7.7 lb/d	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	≤ 15 mg/L	all year
Solids, total suspended	single grab sample	≤ 60 mg/L	all year
Solids, total suspended	daily average	≤ 39 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	≤ 7.7 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .309 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	≤ 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	≤ 26 lb/d	all year

How strict are these limits?

Solids, total suspended, daily average 15 mg/L — stricter than 35% of 939 other minor POTWs in Texas; 58% have the same limit

Solids, total suspended, single grab sample 60 mg/L — stricter than 29% of 536 other minor POTWs in Texas; 65% have the same limit

Oxygen, dissolved [DO], monthly minimum at least 4 mg/L — stricter than 15% of 905 other minor POTWs in Texas; 59% have the same limit

Your permit document is the final word. As JSON: /api/v1/permits/TX0139815 · MCP: https://passage-data.com/mcp