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Sewage treatment plant, major discharger, City Of Longmont, Colorado. NPDES permit CO0041700 expired Nov 30, 2017; its limits still apply. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 | ≤ 13 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.2 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 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 | ≤ 6.3 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5.1 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5.2 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5.4 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.7 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.8 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.7 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.1 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.4 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 3.7 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 5.5 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.1 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 2.1 mg/L | Jul | 002 |
| Cyanide, weak acid, dissociable | 30-day average | report only (ug/L) | all year | 002 |
| Cyanide, weak acid, dissociable | 30-day average | report only (ug/L) | all year | 002 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, weak acid, dissociable | rolling average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | rolling average | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | rolling average | ≤ 15 ug/L | all year | 002 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | rolling average | report only (ug/L) | all year | 002 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, potentially dissolvd | rolling average | report only (ug/L) | all year | 002 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 6 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 | ≤ .026 mg/L | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .046 mg/L | all year | 002 |
| Chlorine, total residual | rolling average | ≤ 5.2 mg/L | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 242 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 484 #/100mL | all year | 002 |
| E. coli | rolling average | report only (#/100mL) | all year | 002 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 002 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 002 |
| Mercury, total [as Hg] | rolling average | report only (ug/L) | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | 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) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 42 tox chronic | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 42 tox chronic | all year | 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 |
| 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 | 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 | 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 | 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 |
| 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 | 30-day average | report only (mg/L) | all year | 300 |
| Solids, total suspended | maximum 7-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/CO0041700 · MCP: https://passage-data.com/mcp