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Photographic Equipment And Supplies, major discharger, Windsor, Colorado. NPDES permit CO0032158 expired Jun 30, 2020; its limits still apply. Last 12 months: no values over a limit, 8 required values missing, 7 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Conductivity | 30-day average | report only (dS/m) | all year |
| Conductivity | daily maximum | report only (dS/m) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 64 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year |
| Bicarbonate ion- [as HCO3] | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 130 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.8 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Dec |
| Nitrogen, inorganic total | rolling average | ≤ 15 mg/L | all year |
| Nitrogen, inorganic total | aggregate rolling median | report only (mg/L) | all year |
| Nitrogen, inorganic total | 95th percentile | ≤ 20 mg/L | all year |
| Nitrogen, inorganic total | 95th percentile | report only (mg/L) | all year |
| Phosphorus, total [as P] | rolling average | report only (mg/L) | all year |
| Phosphorus, total [as P] | rolling average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | 95th percentile | report only (mg/L) | all year |
| Phosphorus, total [as P] | 95th percentile | ≤ 2.5 mg/L | all year |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 14.9 ug/L | all year |
| Calcium, total recoverable | 30-day average | report only (mg/L) | all year |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year |
| Magnesium, total recoverable | 30-day average | report only (mg/L) | all year |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year |
| Sodium, total recoverable | 30-day average | report only (mg/L) | all year |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year |
| Arsenic, total recoverable | 30-day average | ≤ 67 ug/L | all year |
| Arsenic, total recoverable | 30-day average | ≤ 29.6 ug/L | all year |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Silver, potentially dissolved | 30-day average | ≤ 14.2 ug/L | all year |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Cadmium, potentially dissolvd | 30-day average | ≤ 4.7 ug/L | all year |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Selenium, potentially dissolvd | 30-day average | ≤ 12.1 ug/L | all year |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 1.8 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | 30-day average | ≤ .043 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .055 mg/L | all year |
| E. coli | maximum 7-day geometric mean | report only (#/100mL) | all year |
| E. coli | rolling average | report only (#/100mL) | all year |
| Mercury, total [as Hg] | 30-day average | ≤ .016 ug/L | all year |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 12 tox chronic | all year |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 12 tox chronic | all year |
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/CO0032158 · MCP: https://passage-data.com/mcp