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Sewage treatment plant, major discharger, Summit County, Colorado. NPDES permit CO0021539 expired Aug 31, 2020; 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 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 | report only (mg/L) | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Dec | 002 |
| Phosphorus, total [as P] | daily maximum | ≤ .5 mg/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | ≤ 780.8 lb/yr | all year | 002 |
| Phosphorus, total [as P] | daily maximum | ≤ 708.8 lb/yr | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 002 |
| Molybdenum, total [as Mo] | daily maximum | report only (ug/L) | all year | 002 |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Total phenols | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 4.99 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .5 mg/L | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | 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 (abst=0;prst=1) | all year | 002 |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 002 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | 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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Your permit document is the final word. As JSON: /api/v1/permits/CO0021539 · MCP: https://passage-data.com/mcp