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Mason, City of

Sewage treatment plant, Mason, Texas. NPDES permit TX0071111 expired May 8, 2025; its limits still apply. Last 12 months: over a limit 4 times (last July 2026). 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
9 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025E. coli, daily average1733 CFU/100mL≤ 126 CFU/100mL1275%
November 2025E. coli, single grab sample1776 CFU/100mL≤ 399 CFU/100mL345%
February 2026Nitrogen, ammonia total [as N], daily average7.31 mg/L≤ 4 mg/L83%
July 2026BOD, carbonaceous [5 day, 20 C], daily average78 lb/d≤ 65 lb/d20%

Limits in force (15)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 90 mg/Lall year
Solids, total suspendeddaily average≤ 195 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 4 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 8.7 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .26 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. colidaily average≤ 126 CFU/100mLall year
E. colisingle grab sample≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 100 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 65 lb/dall 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/TX0071111 · MCP: https://passage-data.com/mcp