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Sewage treatment plant, major discharger, Durango, Colorado. NPDES permit CO0024082 expired Jun 30, 2024; its limits still apply. Last 12 months: no values over a limit, 2 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 | ≤ 10 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 100 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.6 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 110 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.6 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 70 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.8 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.6 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.8 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.8 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 51 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 15.5 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 17 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 11.5 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 36 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 15.3 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 39 mg/L | Jun | 002 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, inorganic total | daily maximum | ≤ 25 mg/L | all year | 002 |
| Nitrogen, inorganic total | aggregate rolling median | report only (mg/L) | all year | 002 |
| Nitrogen, inorganic total | 95th percentile | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | aggregate rolling median | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | annual median | ≤ 3.2 mg/L | all year | 002 |
| Phosphorus, total [as P] | annual median | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 95th percentile | report only (mg/L) | all year | 002 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ .65 ug/L | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ .85 ug/L | all year | 002 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Iron, total recoverable | rolling average | report only (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 |
| Iron, dissolved [as Fe] | 30-day average | 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 |
| Manganese, dissolved [as Mn] | daily maximum | 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 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Nickel, total recoverable | rolling average | 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 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | rolling average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total recoverable | rolling average | report only (ug/L) | all year | 002 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Molybdenum, total recoverable | rolling 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 | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | daily maximum | report only (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 | 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 | daily maximum | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | rolling average | report only (ug/L) | all year | 002 |
| Aluminum, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Aluminum, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Aluminum, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Aluminum, potentially dissolvd | rolling average | report only (ug/L) | all year | 002 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 12 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 | ≤ 60 ug/L | all year | 002 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 60 ug/L | all year | 002 |
| Cadmium, potentially dissolvd | rolling average | ≤ .29 ug/L | all year | 002 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | 30-day average | ≤ .91 ug/L | all year | 002 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | daily maximum | ≤ 2888 ug/L | all year | 002 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Manganese, potentially dissolvd | rolling average | 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 |
| Nickel, 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 |
| Total phenols | daily maximum | report only (ug/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 | ≤ 3 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3.28 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 | ≤ .09 mg/L | all year | 002 |
| Chlorine, total residual | 30-day average | ≤ .082 mg/L | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .43 mg/L | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .3 mg/L | all year | 002 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 002 |
| Mercury, total [low level] | 30-day average | ≤ .26 ug/L | all year | 002 |
| Mercury, total [low level] | rolling average | report only (ug/L) | all year | 002 |
| Mercury, total [low level] | rolling average | ≤ .039 ug/L | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 1920 #/100mL | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 1756 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 3840 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 3512 #/100mL | all year | 002 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, Total As N | annual median | ≤ 35 mg/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 | rolling average | report only (ug/L) | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | ≤ 40 mg/L | all year | 002 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Sulfate | 30-day average | report only (mg/L) | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 002 |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 002 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | 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 |
| 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] | maximum 7-day average | report only (mg/L) | all year | 300 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (lb/d) | all year | 300 |
| BOD, carbonaceous [5 day, 20 C] | maximum 7-day average | report only (lb/d) | all year | 300 |
Cited limits by parameter: Colorado's rules and the federal ones.
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