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Sewerage Systems, Somerset, Colorado. NPDES permit CO0048900 expired Dec 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 |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 56 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 49 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 70 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 64 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 64 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 54 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.3 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.3 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.7 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5.3 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.7 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 1.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 1.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 1.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.5 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.3 mg/L | Dec | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .016 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | 30-day average | report only (mg/L) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .095 mg/L | all year | 001 |
| Chlorine, total residual | rolling average | ≤ .015 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 958 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 1916 #/100mL | all year | 001 |
| E. coli | rolling average | ≤ 166 #/100mL | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| 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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