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Electric Services, major discharger, Denver, Colorado. NPDES permit CO0001104 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 5 times (last November 2025), 12 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Chloride [as Cl], 30-day average | 555 mg/L | ≤ 250 mg/L | 122% |
| November 2025 | Nitrogen, inorganic total, daily maximum | 13 mg/L | ≤ 10 mg/L | 30% |
| November 2025 | Solids, total suspended, 30-day average | 35 mg/L | ≤ 30 mg/L | 17% |
| November 2025 | Sulfate, 30-day average | 929 mg/L | ≤ 533 mg/L | 74% |
| November 2025 | pH, maximum | 9.3 SU | ≤ 9 SU | — |
| 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 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 13 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 42 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 | ≤ 4.2 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Dec | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 20 mg/L | all year | 001 |
| Nitrogen, inorganic total | daily maximum | ≤ 10 mg/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | ≤ 250 mg/L | all year | 001 |
| Fluoride | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 001 |
| Chromium, total [as Cr] | 30-day average | ≤ 170 ug/L | all year | 001 |
| Chromium, total [as Cr] | 30-day average | ≤ 190 ug/L | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 170 ug/L | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 190 ug/L | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 300 ug/L | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, dissolved [as Mn] | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | 30-day average | ≤ 860 ug/L | all year | 001 |
| Zinc, total [as Zn] | 30-day average | ≤ 950 ug/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 860 ug/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 950 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | 30-day average | report only (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 | 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 | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 28 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 38 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 |
| 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 |
| 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 | ≤ 6.4 ug/L | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 5.5 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 21 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 21 ug/L | all year | 001 |
| Oil and grease | 30-day average | ≤ 6.3 mg/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 8.5 mg/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3.1 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 | ≤ .019 mg/L | all year | 001 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 001 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| Chromium, trivalent dissolved, as Cr | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, trivalent dissolved, as Cr | daily maximum | report only (ug/L) | all year | 001 |
| Sulfate | 30-day average | report only (mg/L) | all year | 001 |
| Sulfate | 30-day average | ≤ 533 mg/L | all year | 001 |
| Boron, total | 30-day average | ≤ 1.2 mg/L | 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 | ≥ 65 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 | ≥ 65 tox chronic | all year | 001 |
| Priority pollutants scan [yes/no] | 30-day average | report only (Y=0;N=1) | all year | 101 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 300 |
| Flow, in conduit or thru treatment plant | per discharge | ≤ 9.7 MGD | all year | 300 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 301 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 9.7 MGD | all year | 301 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 302 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 9.7 MGD | all year | 302 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 304 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 304 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 305 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 305 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 306 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 306 |
| 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.
Same industry: the 7 Electric Services permits in Colorado.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0001104 · MCP: https://passage-data.com/mcp