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Wallis, City of

Sewage treatment plant, Wallis, Texas. NPDES permit TX0025968, in force until Sep 23, 2029. Last 12 months: over a limit 5 times (last August 2026), 30 required values missing, 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (15 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 4 values over a limit, 0 required values missing, 10 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	BOD, 5-day, 20 deg. C, daily average	25.8 mg/L	≤ 20 mg/L	29%
May 2026	Oxygen, dissolved [DO], monthly minimum	3.4 mg/L	≥ 6 mg/L	43%
May 2026	Oxygen, dissolved [DO], monthly minimum	3.4 mg/L	≥ 6 mg/L	43%
July 2026	Oxygen, dissolved [DO], monthly minimum	5.9 mg/L	≥ 6 mg/L	2%
August 2026	Oxygen, dissolved [DO], monthly minimum	5 mg/L	≥ 6 mg/L	17%

Limits in force (15)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	monthly minimum	≥ 6 mg/L	all year
BOD, 5-day, 20 deg. C	daily average	≤ 20 mg/L	all year
BOD, 5-day, 20 deg. C	single grab sample	≤ 65 mg/L	all year
BOD, 5-day, 20 deg. C	daily average	≤ 33 lb/d	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 20 mg/L	all year
Solids, total suspended	single grab sample	≤ 65 mg/L	all year
Solids, total suspended	daily average	≤ 33 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .2 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

How strict are these limits?

Oxygen, dissolved [DO], monthly minimum at least 6 mg/L — stricter than 83% of 905 other minor POTWs in Texas; 17% have the same limit
BOD, 5-day, 20 deg. C, single grab sample 65 mg/L — stricter than 34% of 310 other minor POTWs in Texas; 45% have the same limit
BOD, 5-day, 20 deg. C, daily average 20 mg/L — stricter than 33% of 340 other minor POTWs in Texas; 44% have the same limit

Cited limits by parameter: Texas's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0025968 · MCP: https://passage-data.com/mcp