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Sewage treatment plant, Littleton, Colorado. NPDES permit CO0041645 expired Oct 31, 2016; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.6 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.7 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Dec | 002 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly total | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | year-to-date total | ≤ 1218 lb/yr | all year | 002 |
| Phosphorus, total [as P] | 30-day average | ≤ 1 mg/L | all year | 002 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .6 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .19 mg/L | all year | 002 |
| E. coli | 30-day average | ≤ 913 #/100mL | all year | 002 |
| E. coli | maximum 7-day average | ≤ 1826 #/100mL | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 002 |
| 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/CO0041645 · MCP: https://passage-data.com/mcp