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Colorado River Municipal Water District

Sewage treatment plant, Big Spring, Texas. NPDES permit TX0131857, in force until Jun 29, 2028. Last 12 months: over a limit 4 times (last September 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values)
Renewal application due
Jan 1, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily average16.1 mg/L≤ 9 mg/L79%
March 2026Nitrogen, ammonia total [as N], daily average17.1 mg/L≤ 9 mg/L90%
September 2026Selenium, total [as Se], daily average.029 mg/L≤ .00565 mg/L413%
September 2026Selenium, total [as Se], daily maximum.029 mg/L≤ .0119 mg/L144%

Limits in force (16)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall year
pHminimum≥ 5 SUall year
pHmaximum≤ 11 SUall year
Nitrogen, ammonia total [as N]daily average≤ 9 mg/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Selenium, total [as Se]daily average≤ .00565 mg/Lall year
Selenium, total [as Se]daily maximum≤ .0119 mg/Lall year
Flow, in conduit or thru treatment plantdaily average≤ .75 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .85 MGDall year
Solids, total dissolveddaily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily average≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year
pH range excursions, monthly total accummonthly total≤ 446 minall 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/TX0131857 · MCP: https://passage-data.com/mcp