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Electric Services, Denver, Colorado. NPDES permit CO0000002 expired Nov 30, 2022; its limits still apply. Last 12 months: over a limit 5 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Flow, in conduit or thru treatment plant, 30-day average | .1704 MGD | ≤ .15 MGD | 14% |
| June 2026 | Sulfate, 30-day average | 302 mg/L | ≤ 270 mg/L | 12% |
| July 2026 | Flow, in conduit or thru treatment plant, 30-day average | .179 MGD | ≤ .15 MGD | 19% |
| July 2026 | Sulfate, 30-day average | 305.5 mg/L | ≤ 270 mg/L | 13% |
| August 2026 | Sulfate, 30-day average | 359 mg/L | ≤ 270 mg/L | 33% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 61 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Sep |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year |
| Zinc, total recoverable | 30-day average | ≤ 712 ug/L | all year |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year |
| Chromium, total recoverable | 30-day average | ≤ 142 ug/L | all year |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | ≤ 14 ug/L | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year |
| Copper, potentially dissolved | 30-day average | ≤ 25 ug/L | all year |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Copper, potentially dissolved | daily maximum | ≤ 37 ug/L | all year |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.9 ug/L | all year |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Selenium, potentially dissolvd | daily maximum | ≤ 21 ug/L | all year |
| Oil and grease | 30-day average | ≤ 4.3 mg/L | all year |
| Oil and grease | instantaneous maximum | ≤ 13 mg/L | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .15 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | 30-day average | ≤ .014 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .023 mg/L | all year |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year |
| Sulfate | 30-day average | ≤ 270 mg/L | all year |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 7 Electric Services permits in Colorado.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0000002 · MCP: https://passage-data.com/mcp