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Sewage treatment plant, major discharger, Boulder, Colorado. NPDES permit CO0024147 expired Apr 30, 2016; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 001A |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001A |
| pH | minimum | ≥ 6.5 SU | all year | 001A |
| pH | maximum | ≤ 9 SU | all year | 001A |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001A |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Oct | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Nov | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Dec | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Jan | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | Feb | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Mar | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | Apr | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | May | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.9 mg/L | Jun | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 mg/L | Jul | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Aug | 001A |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Sep | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.3 mg/L | Oct | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29.5 mg/L | Nov | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Dec | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jan | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.3 mg/L | Feb | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.3 mg/L | Mar | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Apr | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | May | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jul | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Aug | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Sep | 001A |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001A |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 30 ug/L | all year | 001A |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 5.4 ug/L | all year | 001A |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001A |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 001A |
| Copper, total recoverable | 30-day average | ≤ 29 ug/L | all year | 001A |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001A |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001A |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | ≤ 12 ug/L | all year | 001A |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 001A |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 17 ug/L | all year | 001A |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001A |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001A |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 001A |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001A |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001A |
| Copper, potentially dissolved | 30-day average | ≤ 21 ug/L | all year | 001A |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001A |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001A |
| Cadmium, potentially dissolvd | 30-day average | ≤ .73 ug/L | all year | 001A |
| Cadmium, potentially dissolvd | daily maximum | ≤ 5.3 ug/L | all year | 001A |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 25 MGD | all year | 001A |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001A |
| Chlorine, total residual | 30-day average | ≤ .003 mg/L | all year | 001A |
| Chlorine, total residual | daily maximum | ≤ .02 mg/L | all year | 001A |
| E. coli | 30-day average | ≤ 123 #/100mL | all year | 001A |
| E. coli | maximum 7-day average | ≤ 246 #/100mL | all year | 001A |
| Toxicity [chronic], Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001A |
| Toxicity [chronic], Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001A |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | single sample | report only (tox chronic) | all year | 001A |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | single sample | report only (tox chronic) | all year | 001A |
| Mercury, total [as Hg] | 30-day average | ≤ .01 ug/L | all year | 001A |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001A |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | ≤ 40 mg/L | all year | 001A |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 001A |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001A |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 001A |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (%) | all year | 001A |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (%) | all year | 001A |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 88 % | all year | 001A |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | single sample | report only (%) | all year | 001A |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | report only (%) | all year | 001A |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | ≥ 88 % | all year | 001A |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 001B |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001B |
| pH | minimum | ≥ 6.5 SU | all year | 001B |
| pH | maximum | ≤ 9 SU | all year | 001B |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001B |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Jan | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Oct | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Nov | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Dec | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | Feb | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Mar | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | Apr | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | May | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.9 mg/L | Jun | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 mg/L | Jul | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Aug | 001B |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Sep | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jan | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.3 mg/L | Oct | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29.5 mg/L | Nov | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Dec | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.3 mg/L | Feb | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.3 mg/L | Mar | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Apr | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | May | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jul | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Aug | 001B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Sep | 001B |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001B |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 30 ug/L | all year | 001B |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 5.5 ug/L | all year | 001B |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001B |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 001B |
| Copper, total recoverable | 30-day average | ≤ 29 ug/L | all year | 001B |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001B |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001B |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | ≤ 13 ug/L | all year | 001B |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 001B |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 18 ug/L | all year | 001B |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001B |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001B |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 001B |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001B |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001B |
| Copper, potentially dissolved | 30-day average | ≤ 26 ug/L | all year | 001B |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001B |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001B |
| Cadmium, potentially dissolvd | 30-day average | ≤ .74 ug/L | all year | 001B |
| Cadmium, potentially dissolvd | daily maximum | ≤ 5.3 ug/L | all year | 001B |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 20 MGD | all year | 001B |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001B |
| Chlorine, total residual | 30-day average | ≤ .004 mg/L | all year | 001B |
| Chlorine, total residual | daily maximum | ≤ .021 mg/L | all year | 001B |
| E. coli | 30-day average | ≤ 137 #/100mL | all year | 001B |
| E. coli | maximum 7-day average | ≤ 274 #/100mL | all year | 001B |
| Toxicity [chronic], Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001B |
| Toxicity [chronic], Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001B |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | single sample | report only (tox chronic) | all year | 001B |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | single sample | report only (tox chronic) | all year | 001B |
| Mercury, total [as Hg] | 30-day average | ≤ .012 ug/L | all year | 001B |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001B |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | ≤ 40 mg/L | all year | 001B |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 001B |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001B |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 001B |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (%) | all year | 001B |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (%) | all year | 001B |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 86 % | all year | 001B |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | single sample | report only (%) | all year | 001B |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | report only (%) | all year | 001B |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | ≥ 86 % | all year | 001B |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 300 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 300 |
Cited limits by parameter: Colorado's rules and the federal ones.
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