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Sewage treatment plant, major discharger, Windsor, Colorado. NPDES permit CO0020320 expired May 31, 2020; its limits still apply. Last 12 months: no values over a limit, 2 of 29 reports late. 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 |
| 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 | ≤ 4.5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.4 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.4 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.8 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.4 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.5 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.8 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.8 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.3 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.1 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.2 mg/L | Apr | 001 |
| Nitrogen, inorganic total | rolling average | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | rolling average | ≤ 15 mg/L | all year | 001 |
| Nitrogen, inorganic total | 95th percentile | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | 95th percentile | ≤ 20 mg/L | all year | 001 |
| Phosphorus, total [as P] | rolling average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | rolling average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | 95th percentile | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 95th percentile | ≤ 2.5 mg/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 11 ug/L | all year | 001 |
| Cyanide, weak acid, dissociable | rolling average | ≤ 2.5 ug/L | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 001 |
| Molybdenum, total [as Mo] | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 18 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Total phenols | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2.8 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 | ≤ .036 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .043 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .02 ug/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | ≤ 40 mg/L | all year | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Boron, total | 30-day average | report only (mg/L) | all year | 001 |
| Boron, total | rolling average | report only (mg/L) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 19 tox chronic | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 19 tox chronic | 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 |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 300 |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | report only (mg/L) | 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/CO0020320 · MCP: https://passage-data.com/mcp