City Of Mesa - Water Resources — NPDES permit AZ0024031: limits, due date and EPA's record

Sewage treatment plant, major discharger, Mesa, Arizona. NPDES permit AZ0024031, in force until Nov 19, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (137)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 2000 kg/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 3100 kg/d	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 2000 kg/d	all year	001
Solids, total suspended	weekly average	≤ 31000 kg/d	all year	001
Oil & Grease	monthly average	report only (mg/L)	all year	001
Oil & Grease	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1 Ratio	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 2 Ratio	all year	001
Iron, total recoverable	monthly average	≤ 600 ug/L	all year	001
Iron, total recoverable	daily maximum	≤ 20000 ug/L	all year	001
Iron, total recoverable	monthly average	≤ 40 kg/d	all year	001
Iron, total recoverable	daily maximum	≤ 100 kg/d	all year	001
Selenium, total recoverable	monthly average	≤ 2 ug/L	all year	001
Selenium, total recoverable	daily maximum	≤ 3 ug/L	all year	001
Selenium, total recoverable	monthly average	≤ 100 g/d	all year	001
Selenium, total recoverable	daily maximum	≤ 200 g/d	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ 9 ug/L	all year	001
Chlorine, total residual	daily maximum	≤ 18 ug/L	all year	001
Chlorine, total residual	monthly average	≤ 610 g/d	all year	001
Chlorine, total residual	daily maximum	≤ 1200 g/d	all year	001
E. coli, colony forming units [CFU]	monthly average	≤ 126 CFU/100mL	all year	001
E. coli, colony forming units [CFU]	daily maximum	≤ 575 CFU/100mL	all year	001
Mercury, total recoverable	monthly average	≤ .008 ug/L	all year	001
Mercury, total recoverable	daily maximum	≤ .02 ug/L	all year	001
Mercury, total recoverable	monthly average	≤ .6 g/d	all year	001
Mercury, total recoverable	daily maximum	≤ 1 g/d	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	monthly median	report only (pass=0;fail=1)	all year	001
Pass/Fail Static 96 Hr Acute Pimephales Promelas	monthly median	report only (pass=0;fail=1)	all year	001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	monthly median	report only (tox chronic)	all year	001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	daily maximum	report only (tox chronic)	all year	001
Static 7Day Chronic Pimephales Promelas	monthly median	report only (tox chronic)	all year	001
Static 7Day Chronic Pimephales Promelas	daily maximum	report only (tox chronic)	all year	001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	monthly median	report only (tox chronic)	all year	001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	daily maximum	report only (tox chronic)	all year	001
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	≤ 2000 kg/d	all year	002
BOD, 5-day, 20 deg. C	weekly average	≤ 3100 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	≤ 2000 kg/d	all year	002
Solids, total suspended	weekly average	≤ 31000 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
Iron, total recoverable	monthly average	≤ 600 ug/L	all year	002
Iron, total recoverable	daily maximum	≤ 20000 ug/L	all year	002
Iron, total recoverable	monthly average	≤ 40 kg/d	all year	002
Iron, total recoverable	daily maximum	≤ 100 kg/d	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	≤ 100 g/d	all year	002
Selenium, total recoverable	daily maximum	≤ 200 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	≤ 610 g/d	all year	002
Chlorine, total residual	daily maximum	≤ 1200 g/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
Mercury, total recoverable	monthly average	≤ .008 ug/L	all year	002
Mercury, total recoverable	daily maximum	≤ .02 ug/L	all year	002
Mercury, total recoverable	monthly average	≤ .6 g/d	all year	002
Mercury, total recoverable	daily maximum	≤ 1 g/d	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	report only (pass=0;fail=1)	all year	002
Pass/Fail Static 96 Hr Acute Pimephales Promelas	monthly median	report only (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
Static 7Day Chronic Pimephales Promelas	monthly median	report only (tox chronic)	all year	002
Static 7Day Chronic Pimephales Promelas	daily maximum	report only (tox chronic)	all year	002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	monthly median	report only (tox chronic)	all year	002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	daily maximum	report only (tox chronic)	all year	002
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	003
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	003
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	003
BOD, 5-day, 20 deg. C	monthly average	≤ 2000 kg/d	all year	003
BOD, 5-day, 20 deg. C	weekly average	≤ 3100 kg/d	all year	003
pH	minimum	≥ 6.5 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
Solids, total suspended	monthly average	≤ 30 mg/L	all year	003
Solids, total suspended	weekly average	≤ 45 mg/L	all year	003
Solids, total suspended	monthly average	≤ 2000 kg/d	all year	003
Solids, total suspended	weekly average	≤ 31000 kg/d	all year	003
Oil & Grease	monthly average	report only (mg/L)	all year	003
Oil & Grease	daily maximum	report only (mg/L)	all year	003
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	003
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	003
Nitrogen, ammonia total [as N]	monthly average	≤ 1 Ratio	all year	003
Nitrogen, ammonia total [as N]	daily maximum	≤ 2 Ratio	all year	003
Selenium, total recoverable	monthly average	≤ 2 ug/L	all year	003
Selenium, total recoverable	daily maximum	≤ 3 ug/L	all year	003
Selenium, total recoverable	monthly average	≤ 100 g/d	all year	003
Selenium, total recoverable	daily maximum	≤ 200 g/d	all year	003
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
Chlorine, total residual	monthly average	≤ 9 ug/L	all year	003
Chlorine, total residual	daily maximum	≤ 18 ug/L	all year	003
Chlorine, total residual	monthly average	≤ 610 g/d	all year	003
Chlorine, total residual	daily maximum	≤ 1200 g/d	all year	003
E. coli, colony forming units [CFU]	monthly average	≤ 126 CFU/100mL	all year	003
E. coli, colony forming units [CFU]	daily maximum	≤ 575 CFU/100mL	all year	003
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	003
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	003
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubia	monthly median	report only (pass=0;fail=1)	all year	003
Pass/Fail Static 96 Hr Acute Pimephales Promelas	monthly median	report only (pass=0;fail=1)	all year	003
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	monthly median	report only (tox chronic)	all year	003
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)	daily maximum	report only (tox chronic)	all year	003
Static 7Day Chronic Pimephales Promelas	monthly median	report only (tox chronic)	all year	003
Static 7Day Chronic Pimephales Promelas	daily maximum	report only (tox chronic)	all year	003
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	monthly median	report only (tox chronic)	all year	003
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	daily maximum	report only (tox chronic)	all year	003
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/AZ0024031 · MCP: https://passage-data.com/mcp