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Frost, City of

Sewage treatment plant, Frost, Texas. NPDES permit TX0022420, in force until Mar 4, 2027. Last 12 months: over a limit 62 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values), form Q quarterly (2 values)
Renewal application due
Sep 5, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 62 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily average4.7 mg/L≤ 3 mg/L57%
October 2025Solids, total suspended, daily average26 mg/L≤ 15 mg/L73%
November 2025BOD, carbonaceous [5 day, 20 C], daily average19 mg/L≤ 10 mg/L90%
November 2025BOD, carbonaceous [5 day, 20 C], daily average6 lb/d≤ 4.2 lb/d43%
November 2025Solids, total suspended, daily average23 lb/d≤ 6.3 lb/d265%
November 2025Solids, total suspended, daily average68 mg/L≤ 15 mg/L353%
November 2025Solids, total suspended, single grab sample89 mg/L≤ 60 mg/L48%
November 2025pH, minimum5.7 SU≥ 6 SU—
December 2025BOD, carbonaceous [5 day, 20 C], daily average14 mg/L≤ 10 mg/L40%
December 2025Nitrogen, ammonia total [as N], daily average2.8 lb/d≤ 1.3 lb/d115%
December 2025Nitrogen, ammonia total [as N], daily average7.6 mg/L≤ 3 mg/L153%
December 2025Nitrogen, ammonia total [as N], single grab sample15.6 mg/L≤ 15 mg/L4%
December 2025Solids, total suspended, daily average12 lb/d≤ 6.3 lb/d90%
December 2025Solids, total suspended, daily average54 mg/L≤ 15 mg/L260%
December 2025Solids, total suspended, single grab sample108 mg/L≤ 60 mg/L80%
January 2026Nitrogen, ammonia total [as N], daily average13.5 mg/L≤ 3 mg/L350%
January 2026Nitrogen, ammonia total [as N], daily average2.2 lb/d≤ 1.3 lb/d69%
January 2026Nitrogen, ammonia total [as N], single grab sample26.2 mg/L≤ 15 mg/L75%
January 2026Solids, total suspended, daily average42 mg/L≤ 15 mg/L180%
January 2026Solids, total suspended, daily average7 lb/d≤ 6.3 lb/d11%
January 2026Solids, total suspended, single grab sample71 mg/L≤ 60 mg/L18%
February 2026BOD, carbonaceous [5 day, 20 C], daily average22 mg/L≤ 10 mg/L120%
February 2026Nitrogen, ammonia total [as N], daily average4.8 mg/L≤ 3 mg/L60%
February 2026Solids, total suspended, daily average10 lb/d≤ 6.3 lb/d59%
February 2026Solids, total suspended, daily average78 mg/L≤ 15 mg/L420%
February 2026Solids, total suspended, single grab sample111 mg/L≤ 60 mg/L85%
March 2026BOD, carbonaceous [5 day, 20 C], daily average14 mg/L≤ 10 mg/L40%
March 2026E. coli, daily average2420 CFU/100mL≤ 126 CFU/100mL1821%
March 2026E. coli, single grab sample2420 CFU/100mL≤ 399 CFU/100mL507%
March 2026Nitrogen, ammonia total [as N], daily average3.8 mg/L≤ 3 mg/L27%
March 2026Solids, total suspended, daily average58 mg/L≤ 15 mg/L287%
March 2026Solids, total suspended, daily average9 lb/d≤ 6.3 lb/d43%
March 2026Solids, total suspended, single grab sample109 mg/L≤ 60 mg/L82%
March 2026pH, minimum5.5 SU≥ 6 SU—
April 2026BOD, carbonaceous [5 day, 20 C], daily average15 mg/L≤ 10 mg/L50%
April 2026BOD, carbonaceous [5 day, 20 C], single grab sample39 mg/L≤ 35 mg/L11%
April 2026Nitrogen, ammonia total [as N], daily average7.6 mg/L≤ 3 mg/L153%
April 2026Nitrogen, ammonia total [as N], single grab sample16.6 mg/L≤ 15 mg/L11%
April 2026Solids, total suspended, daily average56 mg/L≤ 15 mg/L273%
April 2026Solids, total suspended, single grab sample107 mg/L≤ 60 mg/L78%
May 2026Solids, total suspended, daily average27 mg/L≤ 15 mg/L80%
May 2026pH, minimum5.4 SU≥ 6 SU—
June 2026E. coli, single grab sample4840 CFU/100mL≤ 399 CFU/100mL1113%
June 2026Solids, total suspended, daily average27 mg/L≤ 15 mg/L80%
June 2026pH, minimum5.3 SU≥ 6 SU—
July 2026Nitrogen, ammonia total [as N], daily average1.8 lb/d≤ 1.3 lb/d38%
July 2026Nitrogen, ammonia total [as N], daily average11.4 mg/L≤ 3 mg/L280%
July 2026Solids, total suspended, daily average13 lb/d≤ 6.3 lb/d106%
July 2026Solids, total suspended, daily average92 mg/L≤ 15 mg/L513%
July 2026Solids, total suspended, single grab sample125 mg/L≤ 60 mg/L108%
July 2026pH, minimum5.3 SU≥ 6 SU—
August 2026Nitrogen, ammonia total [as N], daily average7.9 mg/L≤ 3 mg/L163%
August 2026Solids, total suspended, daily average39 mg/L≤ 15 mg/L160%
August 2026pH, minimum5 SU≥ 6 SU—
September 2026Nitrogen, ammonia total [as N], daily average14.7 mg/L≤ 3 mg/L390%
September 2026Nitrogen, ammonia total [as N], daily average2.8 lb/d≤ 1.3 lb/d115%
September 2026Nitrogen, ammonia total [as N], single grab sample45.5 mg/L≤ 15 mg/L203%
September 2026Oxygen, dissolved [DO], monthly minimum1.1 mg/L≥ 4 mg/L73%
September 2026Solids, total suspended, daily average47 mg/L≤ 15 mg/L213%
September 2026Solids, total suspended, daily average9 lb/d≤ 6.3 lb/d43%
September 2026Solids, total suspended, single grab sample80 mg/L≤ 60 mg/L33%
September 2026pH, minimum5 SU≥ 6 SU—

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≤ 6.3 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 1.3 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .05 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≤ 4.2 lb/dall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0022420 · MCP: https://passage-data.com/mcp