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Mancos Town of

Sewage treatment plant, Montezuma County, Colorado. NPDES permit CO0021687 expired Oct 31, 2023; its limits still apply. Last 12 months: no values over a limit, 2 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (25 values), outfall 001 form Q quarterly (4 values), outfall 300 form I monthly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 10 of 28 reports late

Limits in force (118)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrade7-day averagereport only (deg C)Mar–Nov001
Temperature, water deg. centigrade7-day averagereport only (deg C)Jan, Feb, Dec001
Temperature, water deg. centigradedaily maximumreport only (deg C)Mar–Nov001
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Dec001
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
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 14 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 18.9 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 18.5 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 24 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 14.4 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 14.7 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 18.4 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 19 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 26.5 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 42 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 28 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 34 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 7.5 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 28 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 34 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 9.2 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 23 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 35 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 29 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 27 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 75 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 47 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 46 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 25.5 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 31 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 33 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 77 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 62 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJan001
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/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LOct001
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≤ 50 mg/LJan001
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/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LDec001
Nitrogen, inorganic totaldaily maximum≤ 55 mg/Lall year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Flow, in conduit or thru treatment plant30-day average≤ .2 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .081 mg/Lall year001
Chlorine, total residual30-day average≤ .011 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .019 mg/Lall year001
E. coli30-day geometric mean≤ 1800 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. coli30-day geometric mean≤ 891 #/100mLMay–Oct001
E. coli30-day geometric mean≤ 205 #/100mLMay–Oct001
E. coli30-day geometric mean≤ 630 #/100mLJan, Feb, Apr, Nov, Dec001
E. coli30-day geometric mean≤ 1728 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. coli30-day geometric mean≤ 949 #/100mLMay–Oct001
E. colimaximum 7-day geometric mean≤ 4000 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. colimaximum 7-day geometric mean≤ 1782 #/100mLMay–Oct001
E. colimaximum 7-day geometric mean≤ 410 #/100mLMay–Oct001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLJan, Feb, Apr, Nov, Dec001
E. colimaximum 7-day geometric mean≤ 3456 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. colimaximum 7-day geometric mean≤ 1898 #/100mLMay–Oct001
Solids, total dissolved30-day averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolved30-day averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 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

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/CO0021687 · MCP: https://passage-data.com/mcp