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Sewage treatment plant, major discharger, Parker, Colorado. NPDES permit CO0041092 expired Oct 31, 2016; its limits still apply. Last 12 months: over a limit once (last December 2025), 20 of 43 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Mercury, total [as Hg], 30-day average | .01 ug/L | ≤ .0088 ug/L | 14% |
| 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 | ≤ 8.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.8 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.7 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jul | 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 | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Dec | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 10 mg/L | all year | 001 |
| Phosphorus, total [as P] | 30-day average | ≤ .05 mg/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 5 ug/L | all year | 001 |
| Chloride [as Cl] | 30-day average | ≤ 240 mg/L | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 27 ug/L | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 40 ug/L | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 15 ug/L | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 40 ug/L | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 20 ug/L | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 33 ug/L | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 67 ug/L | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 96 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | 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 | ≤ 16 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 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent potentially disolvd | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent potentially disolvd | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | ≤ 5 ug/L | all year | 001 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 3 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 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (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 average | ≤ 127 #/100mL | all year | 001 |
| E. coli | maximum 7-day average | ≤ 254 #/100mL | all year | 001 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 001 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 001 |
| Nonylphenol | daily maximum | report only (ug/L) | all year | 001 |
| Nonylphenol | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .0052 ug/L | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .0088 ug/L | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Sulfate | 30-day average | ≤ 223 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) | Jun, Dec | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jun, Dec | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 97 tox chronic | Jun, Dec | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | Jun, Dec | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | Jun, Dec | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 97 tox chronic | Jun, Dec | 001 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| 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 | ≥ 6.5 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 | ≤ 8.9 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.8 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.7 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jan | 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 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Sep | 002 |
| Nitrogen, inorganic total | daily maximum | ≤ 10 mg/L | all year | 002 |
| Phosphorus, total [as P] | 30-day average | ≤ .05 mg/L | all year | 002 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 5 ug/L | all year | 002 |
| Chloride [as Cl] | 30-day average | ≤ 240 mg/L | all year | 002 |
| Iron, total recoverable | 30-day average | ≤ 27 ug/L | all year | 002 |
| Iron, total recoverable | 30-day average | ≤ 40 ug/L | all year | 002 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 15 ug/L | all year | 002 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 40 ug/L | all year | 002 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 20 ug/L | all year | 002 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 33 ug/L | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 67 ug/L | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 96 ug/L | all year | 002 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | 30-day average | ≤ 16 ug/L | all year | 002 |
| Copper, potentially dissolved | 30-day average | ≤ 18 ug/L | all year | 002 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, hexavalent potentially disolvd | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent potentially disolvd | daily maximum | report only (ug/L) | all year | 002 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | 30-day average | ≤ 5 ug/L | all year | 002 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, potentially dissolvd | 30-day average | ≤ 3 ug/L | all year | 002 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | 30-day average | ≤ .011 mg/L | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 002 |
| E. coli | 30-day average | ≤ 127 #/100mL | all year | 002 |
| E. coli | maximum 7-day average | ≤ 254 #/100mL | all year | 002 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 002 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 002 |
| Nonylphenol | daily maximum | report only (ug/L) | all year | 002 |
| Nonylphenol | daily maximum | report only (ug/L) | all year | 002 |
| Mercury, total [as Hg] | 30-day average | ≤ .0052 ug/L | all year | 002 |
| Mercury, total [as Hg] | 30-day average | ≤ .0088 ug/L | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 002 |
| Sulfate | 30-day average | ≤ 223 mg/L | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | Jun, Dec | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jun, Dec | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 97 tox chronic | Jun, Dec | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | Jun, Dec | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | Jun, Dec | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 97 tox chronic | Jun, Dec | 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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