Denver Zoological Foundation Inc

NPDES permit CO0048951 · Minor NON-POTW · administratively continued, expires 2019-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2019-09-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (2).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among CO permits in EPA's filings — check your permit).

Limits in force (19)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, inorganic totalDAILY MX report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .35 MGD all year
001Flow, in conduit or thru treatment plant30DA AVG <= .35 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= .5 mg/L all year
001E. coli30DA GM <= 126 #/100mL all year
001E. coliMX 7D GM <= 252 #/100mL all year
001Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
001Mercury, total [as Hg]30DA AVG report only all year
001Oil and grease visualINST MAX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states