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Sewage treatment plant, major discharger, Grand Lake, Colorado. NPDES permit CO0037681, in force until Apr 30, 2031. Last 12 months: over a limit once (last July 2026), 20 required values missing, 1 of 32 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Nitrogen, ammonia total [as N], 30-day average | 6.61 mg/L | ≤ 6.5 mg/L | 2% |
| 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 |
| 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, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.8 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.8 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Sep | 001 |
| Nitrogen, nitrite total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ 100 mg/L | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (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] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 106 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 | 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 | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, trivalent, 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 |
| 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 |
| 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 | ≤ 2 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 | ≤ .088 ug/L | all year | 001 |
| Acrylamide | 30-day average | report only (ug/L) | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 498 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 975 #/100mL | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | 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 |
| 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] | 30-day average | report only (ug/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 |
| Oil and grease visual | daily 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 | ≥ 100 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 | ≥ 100 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 |
| 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, 30-day geometric mean | 126 #/100mL | tighter | 106.5 #/100mL (12 values) | 0.846× |
| E. coli, maximum 7-day geometric mean | 262 #/100mL | tighter | 124.5 #/100mL (12 values) | 0.475× |
| Manganese, dissolved [as Mn], 30-day average | 50 ug/L | tighter | — | — |
| Mercury, total [low level], 30-day average | 0.01 ug/L | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.1 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.4 mg/L (Jun) | tighter | — | — |
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/CO0037681 · MCP: https://passage-data.com/mcp