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Northlake Municipal Management District 1

Sewerage Systems, Northlake, Texas. NPDES permit TX0137553 expired Oct 22, 2026. Last 12 months: over a limit 6 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
28 values over a limit, 1 required value missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum2420 CFU/100mL≤ 399 CFU/100mL507%
November 2025E. coli, daily maximum437 CFU/100mL≤ 399 CFU/100mL10%
February 2026pH, maximum10.8 SU≤ 9 SU—
March 2026Flow, in conduit or thru treatment plant, daily average.604 MGD≤ .55 MGD10%
April 2026Flow, in conduit or thru treatment plant, daily average.608 MGD≤ .55 MGD11%
June 2026E. coli, daily maximum2420 CFU/100mL≤ 399 CFU/100mL507%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 ug/Lall year
Solids, total suspendeddaily maximum≤ 40 ug/Lall year
Solids, total suspendeddaily average≤ 110 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 22 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .88 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .1 mg/Lall year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
E. colidaily average≤ 126 CFU/100mLall year
E. colidaily maximum≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 73 lb/dall year

How strict are these limits?

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/TX0137553 · MCP: https://passage-data.com/mcp