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Sewerage Systems, Larimer County, Colorado. NPDES permit CO0048861 expired Mar 31, 2023; its limits still apply. Last 12 months: over a limit 6 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | E. coli, rolling average | 8383 #/100mL | ≤ 360 #/100mL | 2229% |
| December 2025 | Solids, total suspended, 30-day average | 118 mg/L | ≤ 30 mg/L | 293% |
| December 2025 | Solids, total suspended, maximum 7-day average | 118 mg/L | ≤ 45 mg/L | 162% |
| March 2026 | E. coli, rolling average | 8384 #/100mL | ≤ 360 #/100mL | 2229% |
| April 2026 | Nitrogen, inorganic total, rolling average | 36.3 mg/L | ≤ 36 mg/L | 1% |
| June 2026 | E. coli, rolling average | 8317 #/100mL | ≤ 360 #/100mL | 2210% |
| 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 | 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 | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2 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 | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 2 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 20 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 23 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 13 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 18 mg/L | Dec | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 211 mg/L | all year | 001 |
| Nitrogen, inorganic total | rolling average | ≤ 36 mg/L | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Arsenic, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .008 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 | ≤ .41 mg/L | all year | 001 |
| Chlorine, total residual | rolling average | ≤ .087 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 2000 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 4000 #/100mL | all year | 001 |
| E. coli | rolling average | ≤ 360 #/100mL | 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 (N=0;Y=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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Your permit document is the final word. As JSON: /api/v1/permits/CO0048861 · MCP: https://passage-data.com/mcp