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Garrison, City of

Sewage treatment plant, Garrison, Texas. NPDES permit TX0076503 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 33 times (last July 2026), 17 required values missing, 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (17 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
30 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 33 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily average12.3 mg/L≤ 8 mg/L54%
October 2025Nitrogen, ammonia total [as N], single grab sample18.9 mg/L≤ 15 mg/L26%
November 2025Nitrogen, ammonia total [as N], daily average8.94 mg/L≤ 8 mg/L12%
December 2025Nitrogen, ammonia total [as N], daily average10.2 mg/L≤ 8 mg/L28%
December 2025Nitrogen, ammonia total [as N], single grab sample18.1 mg/L≤ 15 mg/L21%
January 2026Nitrogen, ammonia total [as N], daily average20.9 lb/d≤ 8 lb/d161%
January 2026Nitrogen, ammonia total [as N], daily average20.9 lb/d≤ 8 lb/d161%
January 2026Nitrogen, ammonia total [as N], daily average29.3 mg/L≤ 8 mg/L266%
January 2026Nitrogen, ammonia total [as N], daily average29.3 mg/L≤ 8 mg/L266%
January 2026Nitrogen, ammonia total [as N], single grab sample89.1 mg/L≤ 15 mg/L494%
January 2026Nitrogen, ammonia total [as N], single grab sample89.1 mg/L≤ 15 mg/L494%
February 2026E. coli, daily average2420 CFU/100mL≤ 126 CFU/100mL1821%
February 2026E. coli, single grab sample2420 CFU/100mL≤ 399 CFU/100mL507%
February 2026Nitrogen, ammonia total [as N], daily average8.39 lb/d≤ 8 lb/d5%
February 2026Nitrogen, ammonia total [as N], daily average9.81 mg/L≤ 8 mg/L23%
February 2026Nitrogen, ammonia total [as N], single grab sample16.9 mg/L≤ 15 mg/L13%
March 2026Nitrogen, ammonia total [as N], daily average11.6 mg/L≤ 8 mg/L45%
March 2026Nitrogen, ammonia total [as N], daily average12.9 lb/d≤ 8 lb/d61%
March 2026Nitrogen, ammonia total [as N], single grab sample15.2 mg/L≤ 15 mg/L1%
April 2026E. coli, daily average2420 CFU/100mL≤ 126 CFU/100mL1821%
April 2026E. coli, single grab sample2420 CFU/100mL≤ 399 CFU/100mL507%
April 2026Nitrogen, ammonia total [as N], daily average11.5 lb/d≤ 8 lb/d44%
April 2026Nitrogen, ammonia total [as N], daily average15.8 mg/L≤ 8 mg/L98%
April 2026Nitrogen, ammonia total [as N], single grab sample24.1 mg/L≤ 15 mg/L61%
May 2026Nitrogen, ammonia total [as N], daily average11.3 lb/d≤ 8 lb/d41%
May 2026Nitrogen, ammonia total [as N], daily average19.2 mg/L≤ 8 mg/L140%
May 2026Nitrogen, ammonia total [as N], single grab sample21.9 mg/L≤ 15 mg/L46%
June 2026Nitrogen, ammonia total [as N], daily average14.8 lb/d≤ 8 lb/d85%
June 2026Nitrogen, ammonia total [as N], daily average21.7 mg/L≤ 8 mg/L171%
June 2026Nitrogen, ammonia total [as N], single grab sample25.2 mg/L≤ 15 mg/L68%
July 2026Nitrogen, ammonia total [as N], daily average14.6 mg/L≤ 8 mg/L83%
July 2026Nitrogen, ammonia total [as N], single grab sample19.8 mg/L≤ 15 mg/L32%
July 2026Oxygen, dissolved [DO], monthly minimum2.2 mg/L≥ 4 mg/L45%

Limits in force (17)

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≤ 90 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 8 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 8 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .12 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≤ 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≤ 30 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/TX0076503 · MCP: https://passage-data.com/mcp