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Sewage treatment plant, major discharger, Highlands Ranch, Colorado. NPDES permit CO0037966 expired Dec 31, 2020; its limits still apply. Last 12 months: over a limit 4 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, maximum 7-day average | 65 mg/L | ≤ 45 mg/L | 44% |
| December 2025 | Copper, total recoverable, daily maximum | 115 ug/L | ≤ 49 ug/L | 135% |
| December 2025 | Solids, total suspended, 30-day average | 48 mg/L | ≤ 30 mg/L | 60% |
| December 2025 | Solids, total suspended, maximum 7-day average | 122 mg/L | ≤ 45 mg/L | 171% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | Jan | 001 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | Feb | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 25 deg C | Mar | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 26 deg C | Apr | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 26 deg C | May | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 25 deg C | Jun | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 25 deg C | Jul | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 25 deg C | Aug | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 25 deg C | Sep | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 26 deg C | Oct | 001 |
| Temperature, water deg. centigrade | maximum weekly average | ≤ 26 deg C | Nov | 001 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | Dec | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Feb | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Mar | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Apr | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | May | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Jun | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Jul | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Aug | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Sep | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Oct | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 29 deg C | Nov | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Dec | 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 | ≤ 4.3 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Dec | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 28 mg/L | all year | 001 |
| Nitrogen, inorganic total | rolling average | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | 95th percentile | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | rolling average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 95th percentile | report only (mg/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | rolling average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | rolling average | ≤ 412 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 |
| Copper, total recoverable | 30-day average | ≤ 35 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 49 ug/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 34 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 35 ug/L | all year | 001 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 8 ug/L | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 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 | ≤ 8.48 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 | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 75 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| Cyanide, free available | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .01 ug/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | 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 (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 | ≥ 98 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 | ≥ 98 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 | UST |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UST |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | UST1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UST1 |
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/CO0037966 · MCP: https://passage-data.com/mcp