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Sewage treatment plant, major discharger, Rio Grande County, Colorado. NPDES permit CO0023132 expired Feb 29, 2020; its limits still apply. Last 12 months: over a limit 15 times (last July 2026), 1 required value missing, 1 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Cadmium, potentially dissolvd, 30-day average | 2.06 ug/L | ≤ .23 ug/L | 796% |
| October 2025 | Zinc, potentially dissolved, 30-day average | 215.6 ug/L | ≤ 59 ug/L | 265% |
| October 2025 | Zinc, potentially dissolved, daily maximum | 405.1 ug/L | ≤ 81 ug/L | 400% |
| November 2025 | Cadmium, potentially dissolvd, 30-day average | 1.02 ug/L | ≤ .23 ug/L | 343% |
| November 2025 | Copper, potentially dissolved, 30-day average | 17.85 ug/L | ≤ 12 ug/L | 49% |
| November 2025 | Copper, potentially dissolved, daily maximum | 35.7 ug/L | ≤ 19 ug/L | 88% |
| December 2025 | Cadmium, potentially dissolvd, 30-day average | .77 ug/L | ≤ .23 ug/L | 235% |
| January 2026 | Cadmium, potentially dissolvd, 30-day average | 1.59 ug/L | ≤ .23 ug/L | 591% |
| February 2026 | Cadmium, potentially dissolvd, 30-day average | 1.1 ug/L | ≤ .23 ug/L | 378% |
| March 2026 | Zinc, potentially dissolved, 30-day average | 85.3 ug/L | ≤ 59 ug/L | 45% |
| March 2026 | Zinc, potentially dissolved, daily maximum | 144.5 ug/L | ≤ 81 ug/L | 78% |
| April 2026 | Cadmium, potentially dissolvd, 30-day average | .57 ug/L | ≤ .23 ug/L | 148% |
| May 2026 | Cadmium, potentially dissolvd, 30-day average | .73 ug/L | ≤ .23 ug/L | 217% |
| June 2026 | Cadmium, potentially dissolvd, 30-day average | .36 ug/L | ≤ .23 ug/L | 57% |
| July 2026 | Cadmium, potentially dissolvd, 30-day average | .35 ug/L | ≤ .23 ug/L | 52% |
| 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 |
| 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 773 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 10 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 75 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 110 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.5 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 125 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 145 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 195 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 150 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 155 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 71 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 mg/L | Dec | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | rolling average | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, 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] | daily maximum | 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 |
| 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 |
| 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 | 30-day average | ≤ 59 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | daily maximum | ≤ 81 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 12 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 19 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .23 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | 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 | 30-day average | ≤ 1 ug/L | all year | 001 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Lead, 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 | 30-day average | ≤ 10 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | 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 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3.09 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 | ≤ .079 ug/L | all year | 001 |
| Mercury, total [low level] | 30-day average | ≤ .079 ug/L | Mar, Jun, Sep, Dec | 001 |
| E. coli | 30-day geometric mean | ≤ 222 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 1562 #/100mL | all year | 001 |
| Nonylphenol | 30-day average | report only (ug/L) | all year | 001 |
| Nonylphenol | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .079 ug/L | all year | 001 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=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 | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 13 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 | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 13 tox chronic | 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 |
| 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 |
Cited limits by parameter: Colorado's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0023132 · MCP: https://passage-data.com/mcp