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Antonito Town of

Sewage treatment plant, Antonito, Colorado. NPDES permit CO0040975 expired Jun 30, 2024; its limits still apply. Last 12 months: over a limit 11 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (4 values), outfall 300 form I monthly (10 values), outfall UST1 form A monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 6 required values missing, 2 of 40 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, inorganic total, daily maximum14.52 mg/L≤ 10 mg/L45%
November 2025Nitrogen, inorganic total, daily maximum16.6 mg/L≤ 10 mg/L66%
December 2025Nitrogen, inorganic total, daily maximum14 mg/L≤ 10 mg/L40%
January 2026Nitrogen, inorganic total, daily maximum13 mg/L≤ 10 mg/L30%
February 2026Nitrogen, inorganic total, daily maximum12.39 mg/L≤ 10 mg/L24%
March 2026Nitrogen, inorganic total, daily maximum13 mg/L≤ 10 mg/L30%
May 2026Nitrogen, inorganic total, daily maximum10.61 mg/L≤ 10 mg/L6%
June 2026Nitrogen, inorganic total, daily maximum11.16 mg/L≤ 10 mg/L12%
July 2026Nitrogen, inorganic total, daily maximum18.09 mg/L≤ 10 mg/L81%
August 2026Nitrogen, inorganic total, daily maximum21.4 mg/L≤ 10 mg/L114%
September 2026Nitrogen, inorganic total, daily maximum11.41 mg/L≤ 10 mg/L14%

Limits in force (92)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 75 mg/Lall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 110 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 33 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 9.2 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 8.6 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 12 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 14 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 17 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 12 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 17 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 14 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 30 mg/L (alert, not enforceable)Jan001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 52 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 46 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 52 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 38 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/L (alert, not enforceable)Jan001
Nitrogen, inorganic totaldaily maximum≤ 104 mg/Lall year001
Nitrogen, inorganic totaldaily maximum≤ 10 mg/Lall year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Flow, in conduit or thru treatment plant30-day average≤ .205 MGDall year001
Flow, in conduit or thru treatment plant30-day average≤ .157 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .073 mg/Lall year001
Chlorine, total residual30-day average≤ .019 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .019 mg/Lall year001
Chlorine, total residualdaily maximum≤ .019 mg/Lall year001
E. coli30-day geometric mean≤ 1020 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 2040 #/100mLall year001
E. colirolling averagereport only (#/100mL)all year001
E. colirolling average≤ 162 #/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year001
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)all year300
Solids, total suspended30-day averagereport only (mg/L)all year300
Solids, total suspendedmaximum 7-day averagereport only (mg/L)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all yearUST1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearUST1

How strict are these limits?

Cited limits by parameter: Colorado'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/CO0040975 · MCP: https://passage-data.com/mcp