City Of Mesa - Water Resources — NPDES permit AZ0025241: limits, due date and EPA's record

Sewage treatment plant, major discharger, Gilbert, Arizona. NPDES permit AZ0025241, in force until Sep 8, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (44)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	monthly average	report only (deg C)	all year	002
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	002
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	002
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	002
BOD, 5-day, 20 deg. C	monthly average	≤ 3400 kg/d	all year	002
BOD, 5-day, 20 deg. C	weekly average	≤ 5100 kg/d	all year	002
pH	minimum	≥ 6.5 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	monthly average	≤ 30 mg/L	all year	002
Solids, total suspended	weekly average	≤ 45 mg/L	all year	002
Solids, total suspended	monthly average	≤ 3400 kg/d	all year	002
Solids, total suspended	weekly average	≤ 5100 kg/d	all year	002
Oil & Grease	monthly average	report only (mg/L)	all year	002
Oil & Grease	daily maximum	report only (mg/L)	all year	002
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	002
Nitrogen, ammonia total [as N]	monthly average	≤ 1 Ratio	all year	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 2 Ratio	all year	002
Selenium, total recoverable	monthly average	≤ 2 ug/L	all year	002
Selenium, total recoverable	daily maximum	≤ 3 ug/L	all year	002
Selenium, total recoverable	monthly average	≤ 200 g/d	all year	002
Selenium, total recoverable	daily maximum	≤ 300 g/d	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Chlorine, total residual	monthly average	≤ 9 ug/L	all year	002
Chlorine, total residual	daily maximum	≤ 18 ug/L	all year	002
Chlorine, total residual	monthly average	≤ 1 kg/d	all year	002
Chlorine, total residual	daily maximum	≤ 2 kg/d	all year	002
E. coli, colony forming units [CFU]	monthly average	≤ 126 CFU/100mL	all year	002
E. coli, colony forming units [CFU]	daily maximum	≤ 575 CFU/100mL	all year	002
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	002
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	002
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	monthly median	≤ 0 pass=0;fail=1	all year	002
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	monthly median	≤ 0 pass=0;fail=1	all year	002
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	monthly median	report only (tox chronic)	all year	002
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	daily maximum	report only (tox chronic)	all year	002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	monthly median	≤ 1 tox chronic	all year	002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	daily maximum	≤ 1.6 tox chronic	all year	002
TU Static Renewal 7-Day Chronic Pimphales promelas	monthly median	≤ 1 tox chronic	all year	002
TU Static Renewal 7-Day Chronic Pimphales promelas	daily maximum	≤ 1.6 tox chronic	all year	002
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	INF
BOD, 5-day, 20 deg. C	weekly average	report only (mg/L)	all year	INF
Solids, total suspended	monthly average	report only (mg/L)	all year	INF
Solids, total suspended	weekly average	report only (mg/L)	all year	INF

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/AZ0025241 · MCP: https://passage-data.com/mcp