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Sewage treatment plant, Montezuma County, Colorado. NPDES permit CO0040509 expired Aug 31, 2018; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .47 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 75 mg/L | all year | 003 |
| Solids, total suspended | maximum 7-day average | ≤ 110 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.9 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.9 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 38.8 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 38.8 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 38.8 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.9 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 38.8 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 135 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 105 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 120 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 75 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 340 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 190 mg/L | Apr | 003 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .47 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | 30-day average | ≤ .14 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .5 mg/L | all year | 003 |
| E. coli | 30-day geometric mean | ≤ 1920 #/100mL | all year | 003 |
| E. coli | maximum 7-day geometric mean | ≤ 3840 #/100mL | all year | 003 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | Jun, Dec | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| pH | minimum | report only (SU) | all year | 004 |
| pH | maximum | report only (SU) | all year | 004 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 004 |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 004 |
| E. coli | maximum 7-day geometric mean | report only (#/100mL) | all year | 004 |
| Plant capacity fact. percent of capacity | 30-day average | report only (%) | all year | 300 |
| Plant capacity fact. percent of capacity | 30-day average | report only (%) | all year | 300 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 300 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | report only (mg/L) | all year | 300 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 300 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | report only (lb/d) | all year | 300 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 300 |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year | 300 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 300 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 300 |
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/CO0040509 · MCP: https://passage-data.com/mcp