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Walnut Springs, City of

Sewage treatment plant, Walnut Springs, Texas. NPDES permit TX0128945, in force until Jun 19, 2029. Last 12 months: over a limit 8 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025pH, maximum9.4 SU≤ 9 SU—
November 2025pH, maximum9.4 SU≤ 9 SU—
April 2026pH, maximum9.2 SU≤ 9 SU—
May 2026Oxygen, dissolved [DO], monthly minimum3.8 mg/L≥ 4 mg/L5%
June 2026BOD, 5-day, 20 deg. C, daily average36.75 mg/L≤ 30 mg/L23%
June 2026Oxygen, dissolved [DO], monthly minimum3.7 mg/L≥ 4 mg/L8%
June 2026pH, maximum9.1 SU≤ 9 SU—
July 2026Oxygen, dissolved [DO], monthly minimum2 mg/L≥ 4 mg/L50%

Limits in force (16)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Csingle grab sample≤ 100 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 16 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 90 mg/Lall year
Solids, total suspendeddaily average≤ 49 lb/dall year
Nitrogen, ammonia total [as N]daily averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]single grab samplereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantdaily average≤ .065 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 126 CFU/100mLall year
E. colisingle grab sample≤ 399 CFU/100mLall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0128945 · MCP: https://passage-data.com/mcp