Srp - Santan Generating Station

NPDES permit AZ0023558 · Major NON-POTW · effective, expires 2029-08-12 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among AZ permits in EPA's filings — check your permit).

Limits in force (96)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 100 mg/L all year
001Oil & GreaseMO AVG <= 15 mg/L all year
001Oil & GreaseDAILY MX <= 20 mg/L all year
001Cyanide, total [as CN]MO AVG report only all year
001Cyanide, total [as CN]DAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverableMO AVG <= 120 ug/L all year
001Arsenic, total recoverableDAILY MX <= 250 ug/L all year
001Selenium, total recoverableMO AVG <= 2 ug/L all year
001Selenium, total recoverableDAILY MX <= 3 ug/L all year
001Chromium, total [as Cr]MO AVG <= 200 ug/L all year
001Chromium, total [as Cr]DAILY MX <= 200 ug/L all year
001Nickel, total recoverableMO AVG <= 170 ug/L all year
001Nickel, total recoverableDAILY MX <= 330 ug/L all year
001Zinc, total recoverableMO AVG <= 1000 ug/L all year
001Zinc, total recoverableDAILY MX <= 1000 ug/L all year
001Copper, total recoverableMO AVG <= 30 ug/L all year
001Copper, total recoverableDAILY MX <= 61 ug/L all year
001Chromium, hexavalent dissolved [as Cr]MO AVG <= 8 ug/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX <= 16 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= 9 ug/L all year
001Chlorine, total residualDAILY MX <= 18 ug/L all year
001Chlorine, free availableMO AVG <= .2 mg/L all year
001Chlorine, free availableDAILY MX <= .5 mg/L all year
001Mercury, total recoverableMO AVG <= .01 ug/L all year
001Mercury, total recoverableDAILY MX <= .02 ug/L all year
001Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiaMO MED report only all year
001Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasMO MED report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MO MED report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMO MED report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMO MED report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasDAILY MX report only all year
005pHMINIMUM >= 6.5 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspendedMO AVG <= 30 mg/L all year
005Solids, total suspendedDAILY MX <= 100 mg/L all year
005Oil & GreaseMO AVG <= 15 mg/L all year
005Oil & GreaseDAILY MX <= 20 mg/L all year
005Cyanide, total [as CN]MO AVG report only all year
005Cyanide, total [as CN]DAILY MX report only all year
005Hardness, total [as CaCO3]MO AVG report only all year
005Hardness, total [as CaCO3]DAILY MX report only all year
005Iron, total recoverableMO AVG <= 800 ug/L all year
005Iron, total recoverableDAILY MX <= 2000 ug/L all year
005Selenium, total recoverableMO AVG <= 2 ug/L all year
005Selenium, total recoverableDAILY MX <= 3 ug/L all year
005Chromium, total [as Cr]MO AVG <= 200 ug/L all year
005Chromium, total [as Cr]DAILY MX <= 200 ug/L all year
005Zinc, total recoverableMO AVG <= 1000 ug/L all year
005Zinc, total recoverableDAILY MX <= 1000 ug/L all year
005Chromium, hexavalent dissolved [as Cr]MO AVG <= 8 ug/L all year
005Chromium, hexavalent dissolved [as Cr]DAILY MX <= 16 ug/L all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Chlorine, total residualMO AVG <= 9 ug/L all year
005Chlorine, total residualDAILY MX <= 18 ug/L all year
005Chlorine, free availableMO AVG <= .2 mg/L all year
005Chlorine, free availableDAILY MX <= .5 mg/L all year
005Mercury, total recoverableMO AVG <= .01 ug/L all year
005Mercury, total recoverableDAILY MX <= .02 ug/L all year
005Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiaMO MED report only all year
005Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasMO MED report only all year
005TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MO MED report only all year
005TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX report only all year
005TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMO MED report only all year
005TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
005TU Static Renewal 7-Day Chronic Pimphales promelasMO MED report only all year
005TU Static Renewal 7-Day Chronic Pimphales promelasDAILY MX report only all year
021pHMINIMUM >= 6.5 SU all year
021pHMAXIMUM <= 9 SU all year
021Solids, total suspendedMO AVG <= 30 mg/L all year
021Solids, total suspendedDAILY MX <= 100 mg/L all year
021Oil & GreaseMO AVG <= 15 mg/L all year
021Oil & GreaseDAILY MX <= 20 mg/L all year
021Hardness, total [as CaCO3]MO AVG report only all year
021Hardness, total [as CaCO3]DAILY MX report only all year
021Selenium, total recoverableMO AVG <= 20 ug/L all year
021Selenium, total recoverableDAILY MX <= 40 ug/L all year
021Boron, total recoverableMO AVG <= 1000 ug/L all year
021Boron, total recoverableDAILY MX <= 2000 ug/L all year
021Chromium, total [as Cr]MO AVG <= 200 ug/L all year
021Chromium, total [as Cr]DAILY MX <= 200 ug/L all year
021Zinc, total recoverableMO AVG <= 1000 ug/L all year
021Zinc, total recoverableDAILY MX <= 1000 ug/L all year
021Flow, in conduit or thru treatment plantMO AVG report only all year
021Flow, in conduit or thru treatment plantDAILY MX report only all year
021Chlorine, free availableMO AVG report only all year
021Chlorine, free availableDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states