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Dilley City of

Sewage treatment plant, Dilley, Texas. NPDES permit TX0137928, in force until May 2, 2029. Last 12 months: over a limit once (last October 2025). Source: EPA ECHO, Oct 22, 2026.

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

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	Solids, total suspended, daily maximum	52 mg/L	≤ 45 mg/L	16%

Limits in force (7)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 25 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Solids, total suspended	daily average	≤ 3.1 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .015 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year

How strict are these limits?

Solids, total suspended, daily average 25 mg/L — stricter than 15% of 939 other minor POTWs in Texas; 3% have the same limit

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/TX0137928 · MCP: https://passage-data.com/mcp