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Quinlan, City of

Sewage treatment plant, Quinlan, Texas. NPDES permit TX0022331, in force until Apr 17, 2031. Last 12 months: over a limit 25 times (last September 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

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

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], single grab sample19.5 mg/L≤ 15 mg/L30%
December 2025Nitrogen, ammonia total [as N], daily average13.88 mg/L≤ 12 mg/L16%
December 2025Nitrogen, ammonia total [as N], single grab sample17.4 mg/L≤ 15 mg/L16%
January 2026BOD, 5-day, 20 deg. C, daily average24 mg/L≤ 10 mg/L140%
January 2026BOD, 5-day, 20 deg. C, daily average48.8578 lb/d≤ 25 lb/d95%
January 2026Solids, total suspended, daily average127.6729 lb/d≤ 38 lb/d236%
January 2026Solids, total suspended, daily average66 mg/L≤ 15 mg/L340%
January 2026Solids, total suspended, single grab sample192 mg/L≤ 60 mg/L220%
February 2026BOD, 5-day, 20 deg. C, daily average16 mg/L≤ 10 mg/L60%
February 2026Solids, total suspended, daily average23 mg/L≤ 15 mg/L53%
March 2026Nitrogen, ammonia total [as N], single grab sample22.7 mg/L≤ 15 mg/L51%
April 2026Nitrogen, ammonia total [as N], daily average13 mg/L≤ 12 mg/L8%
April 2026Nitrogen, ammonia total [as N], daily average79.2266 lb/d≤ 30 lb/d164%
April 2026Nitrogen, ammonia total [as N], single grab sample42.1 mg/L≤ 15 mg/L181%
May 2026BOD, carbonaceous [5 day, 20 C], daily average11 mg/L≤ 10 mg/L10%
May 2026Nitrogen, ammonia total [as N], single grab sample17.6 mg/L≤ 15 mg/L17%
July 2026Nitrogen, ammonia total [as N], daily average13.3 mg/L≤ 12 mg/L11%
July 2026Nitrogen, ammonia total [as N], single grab sample17.9 mg/L≤ 15 mg/L19%
August 2026Nitrogen, ammonia total [as N], daily average15.2 mg/L≤ 12 mg/L27%
August 2026Nitrogen, ammonia total [as N], single grab sample19.9 mg/L≤ 15 mg/L33%
September 2026BOD, carbonaceous [5 day, 20 C], daily average11 mg/L≤ 10 mg/L10%
September 2026Chlorine, total residual, monthly maximum5.4 mg/L≤ 4 mg/L35%
September 2026Nitrogen, ammonia total [as N], daily average25.3 mg/L≤ 12 mg/L111%
September 2026Nitrogen, ammonia total [as N], single grab sample34.4 mg/L≤ 15 mg/L129%
September 2026Solids, total suspended, daily average18 mg/L≤ 15 mg/L20%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendedsingle grab sample≤ 60 mg/Lall year
Solids, total suspendeddaily average≤ 38 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 12 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 30 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .3 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 126 CFU/100mLall year
E. colisingle grab sample≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 35 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 25 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/TX0022331 · MCP: https://passage-data.com/mcp