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Sewage treatment plant, major discharger, Cripple Creek, Colorado. NPDES permit CO0039900 expired Jul 31, 2019; its limits still apply. Last 12 months: over a limit once (last December 2025), 5 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum value | 50.9 tox chronic | ≥ 79 tox chronic | 36% |
| 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 | report only (mg/L) | all year | 001 |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Dec | 001 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | ≤ 5 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 15 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 19 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 | ≤ 1 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 | ≤ .013 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .023 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 157 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 314 #/100mL | all year | 001 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 001 |
| Nonylphenol | rolling average | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .003 ug/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 |
| 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 | ≥ 79 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 | ≥ 79 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 |
| 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 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | CC1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | CC1 |
Cited limits by parameter: Colorado's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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