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Tucson Electric Power Company

Electric Services, Marana, Arizona. NPDES permit AZ0024821, in force until Apr 21, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: form A monthly (2 values), form Q quarterly (5 values), form S twice a year, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

Limits in force (30)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHminimumreport only (SU)all year
pHmaximum≤ 9 SUall year
pHmaximumreport only (SU)all year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Oil & Greasemonthly average≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 20 mg/Lall year
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Beryllium, total recoverable [as Be]daily 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 recoverablemonthly average≤ 6 ug/Lall year
Copper, total recoverabledaily maximum≤ 12 ug/Lall year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Chromium, hexavalent dissolved [as Cr]daily 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
Mercury, total recoverabledaily maximumreport only (ug/L)all year
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)all year

How strict are these limits?

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

Same industry: the 7 Electric Services permits in Arizona.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0024821 · MCP: https://passage-data.com/mcp