Usdoi Nps - Grand Canyon Np

NPDES permit AZ0110426 · Minor FEDERAL · effective, expires 2027-11-21 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
2of 25 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 (103)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 17 kg/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 25 kg/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM report only all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM report only all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedMO AVG <= 17 kg/d all year
001Solids, total suspendedWKLY AVG <= 25 kg/d all year
001Oil & GreaseMO AVG report only all year
001Oil & GreaseDAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1 Ratio all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX <= 2 Ratio 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 <= 7.9 ug/L all year
001Cyanide, total [as CN]DAILY MX <= 16 ug/L all year
001Cyanide, total [as CN]DAILY MX report only all year
001Cyanide, total [as CN]MO AVG <= 4.5 g/d all year
001Cyanide, total [as CN]DAILY MX <= 9 g/d all year
001Sulfide, total [as S]MO AVG report only all year
001Sulfide, total [as S]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]DAILY MX report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Iron, total recoverableMO AVG <= 565.2 ug/L all year
001Iron, total recoverableDAILY MX <= 1740 ug/L all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableMO AVG <= 320.9 g/d all year
001Iron, total recoverableDAILY MX <= 988.1 g/d 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 recoverableMO AVG <= 70.6 ug/L all year
001Nickel, total recoverableDAILY MX report only all year
001Nickel, total recoverableDAILY MX <= 142 ug/L all year
001Nickel, total recoverableMO AVG <= 40.1 g/d all year
001Nickel, total recoverableDAILY MX <= 80.4 g/d all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG <= 117 ug/L all year
001Zinc, total recoverableDAILY MX report only all year
001Zinc, total recoverableDAILY MX <= 198 ug/L all year
001Zinc, total recoverableMO AVG <= 66.7 g/d all year
001Zinc, total recoverableDAILY MX <= 112 g/d 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
001Chromium, total recoverableDAILY MX report only all year
001Copper, total recoverableMO AVG <= 8.1 ug/L all year
001Copper, total recoverableDAILY MX report only all year
001Copper, total recoverableDAILY MX <= 24 ug/L all year
001Copper, total recoverableMO AVG <= 4.6 g/d all year
001Copper, total recoverableDAILY MX <= 14 g/d all year
001Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX 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 report only all year
001Chlorine, total residualDAILY MX <= 18 ug/L all year
001Chlorine, total residualMO AVG <= 5 g/d all year
001Chlorine, total residualDAILY MX <= 10 g/d all year
001E. coli, colony forming units [CFU]MO AVG <= 126 CFU/100mL all year
001E. coli, colony forming units [CFU]DAILY MX <= 575 CFU/100mL all year
001E. coli, colony forming units [CFU]DAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX <= 400 mg/L all year
001Solids, total dissolvedDAILY MX report only all year
001Hydrogen sulfideMO AVG report only all year
001Hydrogen sulfideDAILY MX report only all year
001Hydrogen sulfideDAILY MX report only all year
001Mercury, total recoverableMO AVG <= .01 ug/L all year
001Mercury, total recoverableDAILY MX <= .02 ug/L all year
001Mercury, total recoverableDAILY MX report only all year
001Mercury, total recoverableMO AVG <= .005 g/d all year
001Mercury, total recoverableDAILY MX <= .009 g/d all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MO MED <= 1 tox chronic all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX <= 1.6 tox chronic all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMO MED <= 1 tox chronic all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX <= 1.6 tox chronic 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
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFBOD, 5-day, 20 deg. CWKLY AVG report only all year
INFSolids, total suspendedMO AVG report only all year
INFSolids, total suspendedWKLY AVG 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