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Mesa, City of

Sewage treatment plant, major discharger, Mesa, Arizona. NPDES permit AZ0024627 expired Jun 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: form 1A monthly (6 values), form 1Q quarterly (6 values), form A monthly (21 values), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 42 reports late

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year005
Temperature, water deg. centigradedaily maximumreport only (deg C) (alert, not enforceable)all year005
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year005
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year005
BOD, 5-day, 20 deg. Cmonthly average≤ 2044 kg/dall year005
BOD, 5-day, 20 deg. Cweekly average≤ 3066 kg/dall year005
pHminimum≥ 6.5 SUall year005
pHmaximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 30 mg/Lall year005
Solids, total suspendedweekly average≤ 45 mg/Lall year005
Solids, total suspendedmonthly average≤ 2044 kg/dall year005
Solids, total suspendedweekly average≤ 3066 kg/dall year005
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L) (alert, not enforceable)all year005
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L) (alert, not enforceable)all year005
Nitrogen, ammonia total [as N]monthly averagereport only (Ratio) (alert, not enforceable)all year005
Nitrogen, ammonia total [as N]daily maximumreport only (Ratio) (alert, not enforceable)all year005
Hardness, total [as CaCO3]monthly averagereport only (ug/L) (alert, not enforceable)all year005
Hardness, total [as CaCO3]daily maximumreport only (ug/L) (alert, not enforceable)all year005
Copper, total recoverablemonthly average≤ 16.4 ug/L (alert, not enforceable)all year005
Copper, total recoverabledaily maximum≤ 27.7 ug/L (alert, not enforceable)all year005
Copper, total recoverablemonthly average≤ 1.11 kg/d (alert, not enforceable)all year005
Copper, total recoverabledaily maximum≤ 1.89 kg/d (alert, not enforceable)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Chlorine, total residualmonthly average≤ 11 ug/Lall year005
Chlorine, total residualdaily maximum≤ 19 ug/Lall year005
Chlorine, total residualmonthly average≤ .61 kg/dall year005
Chlorine, total residualdaily maximum≤ 1.23 kg/dall year005
E. coli, colony forming units [CFU]geometric mean≤ 126 CFU/100mLall year005
E. coli, colony forming units [CFU]daily maximum≤ 576 CFU/100mLall year005
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year005
Solids, suspended percent removalmonthly average minimum≥ 85 %all year005
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly average minimum≥ 1 tox chronicall year005
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximum≤ 1.6 tox chronicall year005
TU Static Renewal 7-Day Chronic Pimphales promelasmonthly average minimum≥ 1 tox chronicall year005
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximum≤ 1.6 tox chronicall year005
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (kg/d)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (kg/d)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (kg/d)all yearINF
Solids, total suspendeddaily maximumreport only (kg/d)all yearINF

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/AZ0024627 · MCP: https://passage-data.com/mcp