Usdoi Nps - Grand Canyon Np

NPDES permit AZ0023621 · Minor FEDERAL · expired, expires 2026-03-22 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2026-03-22 and is expired: 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

0values over a limit
37required values missing, on 7 form(s)
3of 48 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (78)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM report only all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Cyanide, total [as CN]MO AVG report only all year
001Cyanide, total [as CN]DAILY MX report only all year
001Sulfide, total [as S]DAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Iron, total recoverableMO AVG report only all year
001Iron, total recoverableDAILY MX report only all year
001Selenium, total recoverableMO AVG report only all year
001Selenium, total recoverableDAILY MX report only all year
001Thallium, total recoverableDAILY MX report only all year
001Beryllium, total recoverable [as Be]DAILY MX report only all year
001Nickel, total recoverableDAILY MX report only all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverableDAILY MX report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverableMO AVG report only all year
001Chromium, total recoverableDAILY MX report only all year
001Copper, total recoverableDAILY MX report only all year
001Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
001Antimony, total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= 9 ug/L all year
001Chlorine, total residualDAILY MX <= 18 ug/L all year
001Chlorine, total residualDAILY MX report only all year
001Chlorine, total residualMO AVG <= 43 g/d all year
001Chlorine, total residualDAILY MX <= 85 g/d all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX <= 907 kg/d all year
001Hydrogen sulfideMO AVG report only all year
001Hydrogen sulfideDAILY MX report only all year
001Mercury, total recoverableMO AVG report only all year
001Mercury, total recoverableDAILY MX report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MO MED report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMO MED report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMO MED report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasDAILY MX report only all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualMO AVG <= 9 ug/L all year
002Chlorine, total residualDAILY MX <= 18 ug/L all year
002Chlorine, total residualMO AVG <= 43 g/d all year
002Chlorine, total residualDAILY MX <= 85 g/d all year
002Solids, total dissolvedMO AVG report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX <= 907 kg/d all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residualMO AVG <= 9 ug/L all year
003Chlorine, total residualDAILY MX <= 18 ug/L all year
003Chlorine, total residualMO AVG <= 43 g/d all year
003Chlorine, total residualDAILY MX <= 85 g/d all year
003Solids, total dissolvedMO AVG report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX <= 907 kg/d 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