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Colorado City Metropolitan District

Sewage treatment plant, Colorado City, Colorado. NPDES permit CO0021121 expired Oct 31, 2019; its limits still apply. Last 12 months: over a limit 5 times (last August 2026), 2 required values missing, 3 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (12 values), outfall 001 form Q quarterly (8 values), outfall 300 form I monthly (3 values), outfall 300 form Q quarterly (7 values), outfall 001 form P yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 31 required values missing, 10 of 33 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, 30-day geometric mean143.18≤ 126 #/100mL14%
May 2026Nitrogen, ammonia total [as N], 30-day average6.55 mg/L≤ 2.9 mg/L126%
June 2026E. coli, maximum 7-day geometric mean394.22 #/100mL≤ 252 #/100mL56%
June 2026Nitrogen, ammonia total [as N], 30-day average3.72 mg/L≤ 3.1 mg/L20%
August 2026E. coli, 30-day geometric mean519.94 #/100mL≤ 126 #/100mL313%

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
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≤ 3.1 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 22 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 22 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 23 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 22 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LApr001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Arsenic, total [as As]daily maximumreport only (ug/L)all year001
Cadmium, total [as Cd]daily maximumreport only (ug/L)all year001
Chromium, total [as Cr]daily maximumreport only (ug/L)all year001
Copper, total [as Cu]daily maximumreport only (ug/L)all year001
Lead, total [as Pb]daily maximumreport only (ug/L)all year001
Molybdenum, total [as Mo]daily maximumreport only (ug/L)Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec001
Nickel, total [as Ni]daily maximumreport only (ug/L)all year001
Silver, total [as Ag]daily maximumreport only (ug/L)all year001
Zinc, total [as Zn]daily maximumreport only (ug/L)all year001
Selenium, total [as Se]daily maximumreport only (ug/L)all year001
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year001
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Total phenolsdaily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plant30-day average≤ .4 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .011 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .019 mg/Lall year001
E. coli30-day geometric mean≤ 126 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 252 #/100mLall year001
Mercury, total [as Hg]daily maximumreport only (ug/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 arithmetic meanreport 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/CO0021121 · MCP: https://passage-data.com/mcp