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Sewage treatment plant, major discharger, Castle Rock, Colorado. NPDES permit CO0038547 expired Oct 31, 2017; its limits still apply. Last 12 months: over a limit 2 times (last January 2026), 2 of 51 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Flow, in conduit or thru treatment plant, 30-day average | 6.442 MGD | ≤ 6.44 MGD | 0% |
| January 2026 | Flow, in conduit or thru treatment plant, 30-day average | 6.664 MGD | ≤ 6.44 MGD | 3% |
| 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 | ≤ 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 | ≤ 4.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Dec | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, inorganic total | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 30-day average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, dissolved [as Mn] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 101 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | ≤ .55 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | ≤ 2.1 ug/L | all year | 001 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 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 | ≤ 6.44 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 | ≤ .012 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 134 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 268 #/100mL | all year | 001 |
| Nonylphenol | 30-day average | report only (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 |
| Sulfate | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=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 | ≥ 90 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 | ≥ 90 tox chronic | all year | 001 |
| Phosphorus, total [as P] | 30-day average | ≤ 1 mg/L | all year | 005 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 005 |
| Phosphorus, total [as P] | annual total | ≤ 4256 lb/yr | all year | 006 |
| Phosphorus, total [as P] | 30-day average | ≤ .05 mg/L | all year | 007 |
| 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/CO0038547 · MCP: https://passage-data.com/mcp