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Denver Zoological Foundation Inc

Heavy Construction, Denver, Colorado. NPDES permit CO0048951 expired Sep 30, 2019; its limits still apply. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (17 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, 30-day average94 mg/L≤ 30 mg/L213%
December 2025Solids, total suspended, maximum 7-day average94 mg/L≤ 45 mg/L109%

Limits in force (19)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year
Arsenic, total recoverable30-day averagereport only (ug/L)all year
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year
Flow, in conduit or thru treatment plant30-day average≤ .35 MGDall year
Flow, in conduit or thru treatment plant30-day average≤ .35 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .5 mg/Lall year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colimaximum 7-day geometric mean≤ 252 #/100mLall year
Sulfide-hydrogen sulfide [undissociated]30-day averagereport only (mg/L)all year
Mercury, total [as Hg]30-day averagereport only (ug/L)all year
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year

How strict are these limits?

Cited limits by parameter: Colorado's rules and the federal ones.

Same industry: the 3 Heavy Construction 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/CO0048951 · MCP: https://passage-data.com/mcp