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Sewerage Systems, Boulder, Colorado. NPDES permit CO0040819 expired Apr 30, 2019; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 27 required values missing, 16 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Solids, total suspended, 30-day average | 87 mg/L | ≤ 30 mg/L | 190% |
| April 2026 | Solids, total suspended, maximum 7-day average | 87 mg/L | ≤ 45 mg/L | 93% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 1.1 lb/d | 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 | ≤ 29 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 141 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 125 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 109 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 121 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 107 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 97 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 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 | ≤ .0045 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 | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 991 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 4000 #/100mL | 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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0040819 · MCP: https://passage-data.com/mcp