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Sewage treatment plant, major discharger, Aspen, Colorado. NPDES permit CO0026387, in force until Apr 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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, total [as N] | annual median | ≤ 26 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 9.1 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.6 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.8 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 8.6 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 11 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 8.3 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.4 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.4 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 6.1 mg/L | Nov | 001 |
| Nitrogen, nitrite total [as N] | 30-day average | ≤ .8 mg/L | all year | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 145 mg/L | all year | 001 |
| Phosphorus, total [as P] | annual median | ≤ 2.7 mg/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 73 ug/L | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | ≤ 4069 mg/L | all year | 001 |
| Arsenic, total recoverable | 30-day average | ≤ 2.7 ug/L | all year | 001 |
| Arsenic, total recoverable | rolling average | ≤ 2.7 ug/L | all year | 001 |
| Iron, total recoverable | 30-day average | report only (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] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | rolling average | 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 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | rolling average | 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 |
| Aluminum, total recoverable | 30-day average | ≤ 21077 ug/L | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | ≤ 4.3 ug/L | all year | 001 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | rolling average | ≤ .64 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | rolling average | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | rolling average | ≤ .81 ug/L | all year | 001 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | report only (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 |
| Total phenols | daily maximum | report only (ug/L) | all year | 001 |
| Manganese, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Uranium, total | 30-day average | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Mercury, total [low level] | 30-day average | ≤ .16 ug/L | all year | 001 |
| Mercury, total [low level] | rolling average | ≤ .025 ug/L | all year | 001 |
| Acrylamide | 30-day average | ≤ .36 ug/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 850 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 1699 #/100mL | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | ≤ .033 mg/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 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/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 |
| Sulfate | 30-day average | report only (mg/L) | all year | 001 |
| Dioxane | 30-day average | ≤ 5.8 ug/L | all year | 001 |
| Boron, total | 30-day average | ≤ 12 mg/L | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 001 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year | 001 |
| 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 |
| Arsenic, total recoverable | 30-day average | report only (ug/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 |
| Perfluorooctanoic acid (PFOA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanoic acid (PFBA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonamide (PFOSA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanoic acid (PFPeA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanoic acid (PFHxA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroundecanoic acid (PFUnA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanoic acid (PFDoA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotridecanoic acid (PFTrDA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotetradecanoic acid (PFTeDA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | 30-day average | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | 30-day average | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | 30-day average | report only (ng/L) (alert, not enforceable) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) (alert, not enforceable) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | 30-day average | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanesulfonic acid (PFBS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanesulfonic acid (PFDS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanesulfonic acid (PFHpS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | 30-day average | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | 30-day average | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | 30-day average | report only (ng/L) | all year | PFAS |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanesulfonic acid (PFPeS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanesulfonic acid (PFNS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | PFAS |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | 30-day average | report only (ng/L) | all year | PFAS |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | PFAS |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | 30-day average | report only (ng/L) | all year | PFAS |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanesulfonic acid (PFDoS) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | PFAS |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | 30-day average | report only (ng/L) | all year | PFAS |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | 30-day average | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | 30-day average | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| PFAS Sum | 30-day average | report only (ng/L) (alert, not enforceable) | all year | PFAS |
| PFAS Sum | daily maximum | report only (ng/L) (alert, not enforceable) | all year | PFAS |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | 30-day average | report only (ng/L) | all year | PFAS |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | PFAS |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | 30-day average | report only (ng/L) | all year | PFAS |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | PFAS |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | 30-day average | report only (ng/L) | all year | PFAS |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | PFAS |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | 30-day average | report only (ng/L) | all year | PFAS |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | 30-day average | report only (ng/L) | all year | PFAS |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | PFAS |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | 30-day average | report only (ng/L) | all year | PFAS |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nonylphenol, 30-day average | 108 ug/L | new | — | — |
| Nonylphenol, daily maximum | 411 ug/L | new | — | — |
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/CO0026387 · MCP: https://passage-data.com/mcp