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Usdoi Nps - Grand Canyon Np

Federal facility (Amusement And Recreation), Grand Canyon, Arizona. NPDES permit AZ0110426, in force until Nov 21, 2027. Last 12 months: no values over a limit, 2 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (22 values), outfall INF form A monthly (4 values), outfall 001 form S twice a year, outfall 001 form Y yearly
Renewal application due
May 25, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 27 reports late

Limits in force (103)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 17 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 25 kg/dall year001
pHminimum≥ 6.5 SUall year001
pHminimumreport only (SU)all year001
pHmaximum≤ 9 SUall year001
pHmaximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 17 kg/dall year001
Solids, total suspendedweekly average≤ 25 kg/dall year001
Oil & Greasemonthly averagereport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 2 Ratioall year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Cyanide, total [as CN]monthly average≤ 7.9 ug/Lall year001
Cyanide, total [as CN]daily maximum≤ 16 ug/Lall year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, total [as CN]monthly average≤ 4.5 g/dall year001
Cyanide, total [as CN]daily maximum≤ 9 g/dall year001
Sulfide, total [as S]monthly averagereport only (ug/L)all year001
Sulfide, total [as S]daily maximumreport only (ug/L)all year001
Sulfide, total [as S]daily maximumreport only (ug/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Arsenic, total recoverabledaily maximumreport only (ug/L)all year001
Iron, total recoverablemonthly average≤ 565.2 ug/Lall year001
Iron, total recoverabledaily maximum≤ 1740 ug/Lall year001
Iron, total recoverabledaily maximumreport only (ug/L)all year001
Iron, total recoverablemonthly average≤ 320.9 g/dall year001
Iron, total recoverabledaily maximum≤ 988.1 g/dall year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Thallium, total recoverabledaily maximumreport only (ug/L)all year001
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year001
Nickel, total recoverablemonthly average≤ 70.6 ug/Lall year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Nickel, total recoverabledaily maximum≤ 142 ug/Lall year001
Nickel, total recoverablemonthly average≤ 40.1 g/dall year001
Nickel, total recoverabledaily maximum≤ 80.4 g/dall year001
Silver total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly average≤ 117 ug/Lall year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximum≤ 198 ug/Lall year001
Zinc, total recoverablemonthly average≤ 66.7 g/dall year001
Zinc, total recoverabledaily maximum≤ 112 g/dall year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverablemonthly average≤ 8.1 ug/Lall year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverabledaily maximum≤ 24 ug/Lall year001
Copper, total recoverablemonthly average≤ 4.6 g/dall year001
Copper, total recoverabledaily maximum≤ 14 g/dall year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year001
Antimony, total recoverabledaily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ 9 ug/Lall year001
Chlorine, total residualdaily maximumreport only (ug/L)all year001
Chlorine, total residualdaily maximum≤ 18 ug/Lall year001
Chlorine, total residualmonthly average≤ 5 g/dall year001
Chlorine, total residualdaily maximum≤ 10 g/dall year001
E. coli, colony forming units [CFU]monthly average≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximum≤ 400 mg/Lall year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Hydrogen sulfidemonthly averagereport only (ug/L)all year001
Hydrogen sulfidedaily maximumreport only (ug/L)all year001
Hydrogen sulfidedaily maximumreport only (ug/L)all year001
Mercury, total recoverablemonthly average≤ .01 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year001
Mercury, total recoverabledaily maximumreport only (ug/L)all year001
Mercury, total recoverablemonthly average≤ .005 g/dall year001
Mercury, total recoverabledaily maximum≤ .009 g/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly median≤ 1 tox chronicall year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximum≤ 1.6 tox chronicall year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly median≤ 1 tox chronicall year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximum≤ 1.6 tox chronicall year001
TU Static Renewal 7-Day Chronic Pimphales promelasmonthly medianreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedweekly averagereport only (mg/L)all yearINF

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/AZ0110426 · MCP: https://passage-data.com/mcp