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Chico, City of

Sewage treatment plant, Chico, Texas. NPDES permit TX0023787, in force until Feb 4, 2027. Last 12 months: over a limit 37 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Renewal application due
Aug 8, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
44 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 37 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily average20.1 lb/d≤ 6.3 lb/d219%
October 2025Nitrogen, ammonia total [as N], daily average53.2 mg/L≤ 5 mg/L964%
October 2025Nitrogen, ammonia total [as N], single grab sample57 mg/L≤ 15 mg/L280%
October 2025Solids, total suspended, daily average23.5 mg/L≤ 20 mg/L18%
November 2025Nitrogen, ammonia total [as N], daily average27.3 lb/d≤ 6.3 lb/d333%
November 2025Nitrogen, ammonia total [as N], daily average47.1 mg/L≤ 5 mg/L842%
November 2025Nitrogen, ammonia total [as N], single grab sample54.1 mg/L≤ 15 mg/L261%
December 2025Nitrogen, ammonia total [as N], daily average17.29 lb/d≤ 6.3 lb/d174%
December 2025Nitrogen, ammonia total [as N], daily average47.9 mg/L≤ 5 mg/L858%
December 2025Nitrogen, ammonia total [as N], single grab sample56.6 mg/L≤ 15 mg/L277%
January 2026Nitrogen, ammonia total [as N], daily average19.12 lb/d≤ 6.3 lb/d203%
January 2026Nitrogen, ammonia total [as N], daily average40.7 mg/L≤ 5 mg/L714%
January 2026Nitrogen, ammonia total [as N], single grab sample55.9 mg/L≤ 15 mg/L273%
January 2026Solids, total suspended, daily average21.1 mg/L≤ 20 mg/L6%
February 2026Nitrogen, ammonia total [as N], daily average15.85 lb/d≤ 6.3 lb/d152%
February 2026Nitrogen, ammonia total [as N], daily average36.08 mg/L≤ 5 mg/L622%
February 2026Nitrogen, ammonia total [as N], single grab sample47.7 mg/L≤ 15 mg/L218%
March 2026Nitrogen, ammonia total [as N], daily average17.59 lb/d≤ 6.3 lb/d179%
March 2026Nitrogen, ammonia total [as N], daily average31.88 mg/L≤ 5 mg/L538%
March 2026Nitrogen, ammonia total [as N], single grab sample52.5 mg/L≤ 15 mg/L250%
April 2026E. coli, single grab sample866 CFU/100mL≤ 399 CFU/100mL117%
April 2026Nitrogen, ammonia total [as N], daily average24.4 lb/d≤ 6.3 lb/d287%
April 2026Nitrogen, ammonia total [as N], daily average44.6 mg/L≤ 5 mg/L792%
April 2026Nitrogen, ammonia total [as N], single grab sample66.3 mg/L≤ 15 mg/L342%
May 2026Nitrogen, ammonia total [as N], daily average25.3 lb/d≤ 6.3 lb/d302%
May 2026Nitrogen, ammonia total [as N], daily average49.2 mg/L≤ 5 mg/L884%
May 2026Nitrogen, ammonia total [as N], single grab sample56 mg/L≤ 15 mg/L273%
June 2026Nitrogen, ammonia total [as N], daily average10.78 lb/d≤ 6.3 lb/d71%
June 2026Nitrogen, ammonia total [as N], daily average41.7 mg/L≤ 5 mg/L734%
June 2026Nitrogen, ammonia total [as N], single grab sample47.4 mg/L≤ 15 mg/L216%
July 2026Nitrogen, ammonia total [as N], daily average39.42 mg/L≤ 5 mg/L688%
July 2026Nitrogen, ammonia total [as N], daily average8.78 lb/d≤ 6.3 lb/d39%
July 2026Nitrogen, ammonia total [as N], single grab sample57.2 mg/L≤ 15 mg/L281%
July 2026Solids, total suspended, daily average20.6 mg/L≤ 20 mg/L3%
August 2026Nitrogen, ammonia total [as N], daily average34 mg/L≤ 5 mg/L580%
August 2026Nitrogen, ammonia total [as N], daily average7.3 lb/d≤ 6.3 lb/d16%
August 2026Nitrogen, ammonia total [as N], single grab sample54.2 mg/L≤ 15 mg/L261%

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≤ 20 mg/Lall year
Solids, total suspendedsingle grab sample≤ 65 mg/Lall year
Solids, total suspendeddaily average≤ 25 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 6.3 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .15 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≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 65 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.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0023787 · MCP: https://passage-data.com/mcp