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Sewage treatment plant, major discharger, Alamosa County, Colorado. NPDES permit CO0044458 expired Oct 31, 2019; 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 | 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 | ≤ 6.5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 54 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Dec | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 6.3 ug/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 6.3 ug/L | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | ≤ 15 ug/L | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 840 ug/L | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 840 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 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | ≤ 10 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 20 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 100 ug/L | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 100 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | ≤ 127 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | ≤ 127 ug/L | all year | 001 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | ≤ .26 ug/L | all year | 001 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | daily maximum | ≤ 1.1 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 9 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 10 ug/L | all year | 001 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, trivalent, potentially dissolvd | 30-day average | ≤ 99 ug/L | all year | 001 |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, trivalent, potentially dissolvd | daily maximum | ≤ 469 ug/L | all year | 001 |
| Lead, potentially dissolvd | 30-day average | ≤ 2 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 |
| Total phenols | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2.571 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 | ≤ .024 mg/L | all year | 001 |
| Mercury, total [low level] | 30-day average | ≤ .02 ug/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 147 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 294 #/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 | ≤ .02 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 |
| 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 | ≥ 49 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 | ≥ 49 tox chronic | all year | 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 |
| Conductivity | 30-day average | report only (dS/m) | 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 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 002 |
| Bicarbonate ion- [as HCO3] | maximum 7-day average | report only (mg/L) | 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 | ≤ 22 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 65 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 65 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 46 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 48 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 37 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 40 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 59 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 57 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 64 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 46 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 46 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | maximum 7-day average | ≤ 41 mg/L | Dec | 002 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 4 ug/L | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Calcium, total recoverable | 30-day average | report only (mg/L) | all year | 002 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Magnesium, total recoverable | 30-day average | report only (mg/L) | all year | 002 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Sodium, total recoverable | 30-day average | report only (mg/L) | all year | 002 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 002 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 002 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 002 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 002 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 50 ug/L | all year | 002 |
| Iron, total recoverable | 30-day average | ≤ 840 ug/L | all year | 002 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 002 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 002 |
| Molybdenum, total [as Mo] | daily maximum | report only (ug/L) | all year | 002 |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 002 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Selenium, total [as Se] | daily maximum | 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 | ≤ 56 ug/L | all year | 002 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | daily maximum | ≤ 424 ug/L | all year | 002 |
| Zinc, potentially dissolved | rolling average | report only (ug/L) | all year | 002 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 002 |
| Silver, potentially dissolved | 30-day average | ≤ 1.9 ug/L | all year | 002 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Silver, potentially dissolved | 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 | 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 | daily maximum | ≤ 39 ug/L | all year | 002 |
| Copper, potentially dissolved | rolling 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 |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Nickel, potentially dissolvd | daily maximum | 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 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Total phenols | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2.571 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 | ≤ .067 mg/L | all year | 002 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 147 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 294 #/100mL | 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 | rolling average | report only (ug/L) | all year | 002 |
| Sodium Absorption Ratio | 30-day average | report only (fail=0;pass=1) | all year | 002 |
| Sodium Absorption Ratio | daily maximum | report only (fail=0;pass=1) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | 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 (abst=0;prst=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 | ≥ 12 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 | ≥ 12 tox chronic | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2.571 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| 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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Your permit document is the final word. As JSON: /api/v1/permits/CO0044458 · MCP: https://passage-data.com/mcp