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Flagstaff Utilities Division

Sewage treatment plant, major discharger, Flagstaff, Arizona. NPDES permit AZ0023639, in force until Apr 17, 2030. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (28 values), outfall 002 form A monthly (6 values), outfall INF form A monthly (4 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 38 reports late

Limits in force (74)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)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. Cmonthly average≤ 450 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 680 kg/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 450 kg/dall year001
Solids, total suspendedweekly average≤ 680 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 averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (Ratio)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (Ratio)all year001
Sulfide, total [as S]monthly averagereport 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
Zinc, total recoverablemonthly average≤ 93 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 190 ug/Lall year001
Zinc, total recoverablemonthly average≤ 1400 g/dall year001
Zinc, total recoverabledaily maximum≤ 2800 g/dall year001
Copper, total recoverablemonthly average≤ 18 ug/Lall year001
Copper, total recoverabledaily maximum≤ 36 ug/Lall year001
Copper, total recoverablemonthly average≤ 270 g/dall year001
Copper, total recoverabledaily maximum≤ 550 g/dall 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 maximum≤ 18 ug/Lall year001
Chlorine, total residualmonthly average≤ 140 g/dall year001
Chlorine, total residualdaily maximum≤ 270 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
Cyanide, free availablemonthly average≤ 7.9 ug/Lall year001
Cyanide, free availabledaily maximum≤ 16 ug/Lall year001
Cyanide, free availablemonthly average≤ 120 g/dall year001
Cyanide, free availabledaily maximum≤ 240 g/dall year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all 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
Mercury, total recoverablemonthly average≤ .008 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year001
Mercury, total recoverablemonthly average≤ .1 g/dall year001
Mercury, total recoverabledaily maximum≤ .2 g/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiadaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximumreport only (pass=0;fail=1)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly medianreport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly medianreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ 9 ug/Lall year002
Chlorine, total residualdaily maximum≤ 18 ug/Lall year002
Chlorine, total residualmonthly average≤ 140 g/dall year002
Chlorine, total residualdaily maximum≤ 270 g/dall year002
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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0023639 · MCP: https://passage-data.com/mcp