Coorstek Inc

NPDES permit CO0044890 · Minor NON-POTW · administratively continued, expires 2023-07-31 · EPA's file as of 2026-09-19

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Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2023-07-31 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

1values over a limit
0required values missing, on 0 form(s)
0of 4 forms filed late

Last period with anything received: 2026-06-30. Most often over: Flow, in conduit or thru treatment plant (1).

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 (30)

OutfallParameterStatisticLimitMonths
021pHMINIMUM >= 6 SU all year
021pHMAXIMUM <= 10 SU all year
021Cyanide, total [as CN]30DA AVG report only all year
021Cyanide, total [as CN]DAILY MX report only all year
021Arsenic, total [as As]30DA AVG report only all year
021Arsenic, total [as As]DAILY MX report only all year
021Cadmium, total [as Cd]30DA GEO report only all year
021Cadmium, total [as Cd]DAILY MX report only all year
021Chromium, total [as Cr]30DA AVG report only all year
021Chromium, total [as Cr]DAILY MX report only all year
021Copper, total [as Cu]30DA AVG report only all year
021Copper, total [as Cu]DAILY MX report only all year
021Lead, total [as Pb]30DA AVG report only all year
021Lead, total [as Pb]DAILY MX report only all year
021Molybdenum, total [as Mo]30DA AVG report only all year
021Molybdenum, total [as Mo]DAILY MX report only all year
021Nickel, total [as Ni]30DA AVG report only all year
021Nickel, total [as Ni]DAILY MX report only all year
021Silver, total [as Ag]30DA AVG report only all year
021Silver, total [as Ag]DAILY MX report only all year
021Zinc, total [as Zn]30DA AVG report only all year
021Zinc, total [as Zn]DAILY MX report only all year
021Selenium, total [as Se]30DA AVG report only all year
021Selenium, total [as Se]DAILY MX report only all year
021Total phenols30DA GM report only all year
021Total phenolsDAILY MX report only all year
021Flow, in conduit or thru treatment plant30DA AVG <= 1 MGD all year
021Flow, in conduit or thru treatment plantDAILY MX report only all year
021Mercury, total [as Hg]30DA AVG report only all year
021Mercury, total [as Hg]DAILY MX 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