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Sewage treatment plant, major discharger, Frisco, Colorado. NPDES permit CO0020451 expired Feb 28, 2026; its limits still apply. Last 12 months: over a limit 6 times (last January 2026), 8 required values missing, 5 of 42 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride [as Cl], 30-day average | 76.6 mg/L | ≤ 56 mg/L | 37% |
| November 2025 | Chloride [as Cl], 30-day average | 86.4 mg/L | ≤ 56 mg/L | 54% |
| November 2025 | Zinc, potentially dissolved, 30-day average | 54.5 ug/L | ≤ 54 ug/L | 1% |
| December 2025 | Chloride [as Cl], 30-day average | 114 mg/L | ≤ 56 mg/L | 104% |
| January 2026 | Chloride [as Cl], 30-day average | 118 mg/L | ≤ 56 mg/L | 111% |
| January 2026 | Zinc, potentially dissolved, 30-day average | 54.3 ug/L | ≤ 54 ug/L | 1% |
| 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 SU | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 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 | ≤ 3.1 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 8.9 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 8.7 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 8.7 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 9.1 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | rolling average | ≤ 10 mg/L | Dec | 002 |
| Nitrogen, nitrite total [as N] | 30-day average | ≤ .55 mg/L | all year | 002 |
| Nitrogen, inorganic total | daily maximum | ≤ 44 mg/L | all year | 002 |
| Nitrogen, inorganic total | daily maximum | ≤ 10 mg/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | ≤ .5 mg/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | annual total | ≤ 341 lb/yr | 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 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Chloride [as Cl] | 30-day average | ≤ 127 mg/L | all year | 002 |
| Chloride [as Cl] | 30-day average | ≤ 56 mg/L | all year | 002 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | rolling average | report only (mg/L) | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 1 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 |
| 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 |
| Aluminum, total recoverable | 30-day average | ≤ 1438 ug/L | all year | 002 |
| Aluminum, total recoverable | 30-day average | ≤ 14989 ug/L | all year | 002 |
| Aluminum, total recoverable | daily maximum | ≤ 10071 ug/L | all year | 002 |
| Aluminum, total recoverable | daily maximum | ≤ 45221 ug/L | all year | 002 |
| Aluminum, total recoverable | rolling average | ≤ 922 ug/L | all year | 002 |
| Cadmium, total recoverable | 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 | 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] | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | rolling average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | rolling average | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 437 ug/L | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 54 ug/L | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 412 ug/L | all year | 002 |
| Zinc, potentially dissolved | daily maximum | ≤ 437 ug/L | all year | 002 |
| Zinc, potentially dissolved | daily maximum | ≤ 125 ug/L | all year | 002 |
| Zinc, potentially dissolved | daily maximum | ≤ 412 ug/L | all year | 002 |
| Zinc, potentially dissolved | rolling average | ≤ 149 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 |
| Silver, potentially dissolved | rolling average | report only (ug/L) | all year | 002 |
| Copper, potentially dissolved | 30-day average | ≤ 6 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 |
| 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 | 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 |
| Cadmium, potentially dissolvd | rolling average | report only (ug/L) | all year | 002 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, trivalent, potentially dissolvd | rolling average | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Lead, potentially dissolvd | rolling average | report only (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 |
| Selenium, potentially dissolvd | rolling average | 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 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, trivalent total recoverable | rolling average | report only (ug/L) | all year | 002 |
| Chromium, trivalent total recoverable | rolling average | report only (ug/L) | all year | 002 |
| Radium 226 + radium 228, total | 30-day average | report only (pCi/L) | all year | 002 |
| Radium 226 + radium 228, total | quarterly average | report only (pCi/L) | all year | 002 |
| Strontium 90, total | 30-day average | report only (pCi/L) | all year | 002 |
| Strontium 90, total | rolling average | report only (pCi/L) | all year | 002 |
| Uranium, total | 30-day average | report only (ug/L) | all year | 002 |
| Uranium, total | rolling average | report only (ug/L) | all year | 002 |
| Cesium-134 | 30-day average | report only (pCi/L) | all year | 002 |
| Cesium-134 | rolling average | report only (pCi/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 2 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 | 30-day average | ≤ .066 mg/L | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .086 mg/L | all year | 002 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 002 |
| Acrylamide | 30-day average | ≤ .022 ug/L | all year | 002 |
| Acrylamide | rolling average | ≤ .038 ug/L | all year | 002 |
| Acrylamide | 30-day average | ≤ .26 ug/L | all year | 002 |
| E. coli | 30-day geometric mean | ≤ 39 #/100mL | all year | 002 |
| E. coli | 30-day average | ≤ 37 #/100mL | all year | 002 |
| E. coli | maximum 7-day geometric mean | ≤ 78 #/100mL | all year | 002 |
| E. coli | maximum 7-day average | ≤ 74 #/100mL | all year | 002 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 002 |
| Sulfide-hydrogen sulfide [undissociated] | rolling average | report only (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 |
| Thorium-230 + Thorium-232 | 30-day average | report only (pCi/L) | all year | 002 |
| Thorium-230 + Thorium-232 | rolling average | report only (pCi/L) | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | 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 |
| 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 |
| 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 | ≥ 100 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 | ≥ 100 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 |
| 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 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | UST1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UST1 |
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/CO0020451 · MCP: https://passage-data.com/mcp