Passage Data · Check a report · Use it from your AI
Irrigation Systems, Denver County, Colorado. NPDES permit CO0048721 expired Apr 30, 2016; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| 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 | ≤ 45 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32 mg/L | Sep |
| Nitrogen, nitrite total [as N] | daily maximum | ≤ .05 mg/L | all year |
| Nitrogen, nitrite total [as N] | daily maximum | ≤ .5 mg/L | all year |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/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 |
| Selenium, potentially dissolvd | 30-day average | report only (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 | ≤ 10 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | 30-day average | ≤ .011 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year |
| E. coli | 30-day average | ≤ 126 #/100mL | all year |
| E. coli | maximum 7-day average | ≤ 252 #/100mL | all year |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year |
Cited limits by parameter: Colorado's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0048721 · MCP: https://passage-data.com/mcp