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City Of Tucson - Water

Water Supply, major discharger, Tucson, Arizona. NPDES permit AZ0026166, in force until Jun 13, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (28 values), form Q quarterly (11 values), form S twice a year, form Y yearly
Renewal application due
Dec 16, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 19 reports late

Limits in force (65)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
pHminimumreport only (SU)all year
pHminimum≥ 6.5 SUall year
pHmaximumreport only (SU)all year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year
Nitrogen, ammonia total [as N]daily maximum≤ 2 Ratioall year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cyanide, total [as CN]monthly average≤ 8.6 ug/Lall year
Cyanide, total [as CN]daily maximum≤ 14 ug/Lall year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Cyanide, total [as CN]monthly average≤ 91 g/dall year
Cyanide, total [as CN]daily maximum≤ 148 g/dall year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Iron, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverablemonthly average≤ 2 ug/Lall year
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverablemonthly average≤ 17 g/dall year
Selenium, total recoverabledaily maximum≤ 35 g/dall year
Thallium, total recoverabledaily maximumreport only (ug/L)all year
Beryllium, total recoverable [as Be]daily maximumreport only (ug/L)all year
Boron, total recoverabledaily maximumreport only (ug/L)all year
Barium, total recoverabledaily maximumreport only (ug/L)all year
Chromium, total [as Cr]daily maximumreport only (ug/L)all year
Nickel, total recoverabledaily maximumreport only (ug/L)all year
Silver total recoverabledaily maximumreport only (ug/L)all year
Zinc, total recoverabledaily maximumreport only (ug/L)all year
Cadmium, total recoverabledaily maximumreport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year
Antimony, total recoverabledaily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ 8.5 ug/Lall year
Chlorine, total residualdaily maximumreport only (ug/L)all year
Chlorine, total residualdaily maximum≤ 19 ug/Lall year
Chlorine, total residualmonthly average≤ 91 g/dall year
Chlorine, total residualdaily maximum≤ 201 g/dall year
E. coli, colony forming units [CFU]monthly average≤ 126 CFU/100mLall year
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Mercury, total recoverablemonthly average≤ .01 ug/Lall year
Mercury, total recoverabledaily maximumreport only (ug/L)all year
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year
Mercury, total recoverablemonthly average≤ .1 g/dall year
Mercury, total recoverabledaily maximum≤ .2 g/dall year
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly medianreport only (tox chronic)all year
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly medianreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Pimphales promelasmonthly medianreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year

How strict are these limits?

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

Same industry: the 9 Water Supply permits in Arizona.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0026166 · MCP: https://passage-data.com/mcp