Oak Manor Mud — NPDES permit TX0023337: limits, due date and EPA's record

Oak Manor Mud

Sewage treatment plant, Alvin, Texas. NPDES permit TX0023337, in force until Feb 2, 2029. Last 12 months: over a limit 19 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 20 days after each period: form A monthly (16 values), form Q quarterly

Last report on file

September 2026

Oct 2024 – Sep 2025

6 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 19 values over a limit

Period ending	Parameter	Reported	Limit	Over by
October 2025	Solids, total suspended, daily average	24.24 mg/L	≤ 15 mg/L	62%
November 2025	Solids, total suspended, daily average	10.69 lb/d	≤ 10 lb/d	7%
November 2025	Solids, total suspended, daily average	60.15 mg/L	≤ 15 mg/L	301%
November 2025	Solids, total suspended, single grab sample	81.8 mg/L	≤ 60 mg/L	36%
December 2025	Solids, total suspended, daily average	34.52 mg/L	≤ 15 mg/L	130%
January 2026	Nitrogen, ammonia total [as N], daily average	3.8 mg/L	≤ 3 mg/L	27%
January 2026	Solids, total suspended, daily average	37.8 mg/L	≤ 15 mg/L	152%
February 2026	Solids, total suspended, daily average	15.12 lb/d	≤ 10 lb/d	51%
February 2026	Solids, total suspended, daily average	58.53 mg/L	≤ 15 mg/L	290%
February 2026	Solids, total suspended, single grab sample	102 mg/L	≤ 60 mg/L	70%
March 2026	BOD, carbonaceous [5 day, 20 C], daily average	10.43 mg/L	≤ 10 mg/L	4%
March 2026	Solids, total suspended, daily average	11.29 lb/d	≤ 10 lb/d	13%
March 2026	Solids, total suspended, daily average	64.34 mg/L	≤ 15 mg/L	329%
March 2026	Solids, total suspended, single grab sample	140 mg/L	≤ 60 mg/L	133%
April 2026	Nitrogen, ammonia total [as N], daily average	3.1 mg/L	≤ 3 mg/L	3%
April 2026	Nitrogen, ammonia total [as N], single grab sample	15.7 mg/L	≤ 15 mg/L	5%
April 2026	Solids, total suspended, daily average	15.93 mg/L	≤ 15 mg/L	6%
June 2026	Nitrogen, ammonia total [as N], daily average	2.07 lb/d	≤ 2 lb/d	3%
June 2026	Nitrogen, ammonia total [as N], daily average	4.12 mg/L	≤ 3 mg/L	37%

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	≤ 10 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	≤ 2 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .08 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	≤ 6.7 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/TX0023337 · MCP: https://passage-data.com/mcp