Town Of Gila Bend

NPDES permit AZ0020231 · Minor POTW · effective, expires 2030-06-09 · 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

17values over a limit
7required values missing, on 2 form(s)
2of 24 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (7), Cyanide, total [as CN] (5), Solids, total suspended (4).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (81)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 65 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 120 kg/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 170 kg/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 45 mg/L all year
001Solids, total suspendedWKLY AVG <= 65 mg/L all year
001Solids, total suspendedMO AVG <= 120 kg/d all year
001Solids, total suspendedWKLY AVG <= 170 kg/d all year
001Oil & GreaseMO AVG <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Oil & GreaseMO AVG <= 26 kg/d all year
001Oil & GreaseDAILY MX <= 40 kg/d all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1 Ratio all year
001Nitrogen, ammonia total [as N]DAILY MX <= 2 Ratio all year
001Cyanide, total [as CN]MO AVG <= 7.9 ug/L all year
001Cyanide, total [as CN]DAILY MX <= 16 ug/L all year
001Cyanide, total [as CN]MO AVG <= 21 g/d all year
001Cyanide, total [as CN]DAILY MX <= 42 g/d all year
001Sulfide, total [as S]MO AVG report only all year
001Sulfide, total [as S]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
001Iron, total recoverableMO AVG <= 800 ug/L all year
001Iron, total recoverableDAILY MX <= 2000 ug/L all year
001Iron, total recoverableMO AVG <= 2000 g/d all year
001Iron, total recoverableDAILY MX <= 4000 g/d all year
001Selenium, total recoverableMO AVG <= 2 ug/L all year
001Selenium, total recoverableDAILY MX <= 3 ug/L all year
001Selenium, total recoverableMO AVG <= 4 g/d all year
001Selenium, total recoverableDAILY MX <= 9 g/d all year
001Chromium, total [as Cr]MO AVG report only all year
001Chromium, total [as Cr]DAILY MX report only all year
001Zinc, total recoverableMO AVG <= 110 ug/L all year
001Zinc, total recoverableDAILY MX <= 230 ug/L all year
001Zinc, total recoverableMO AVG <= 300 g/d all year
001Zinc, total recoverableDAILY MX <= 600 g/d all year
001Copper, total recoverableMO AVG <= 14 ug/L all year
001Copper, total recoverableDAILY MX <= 29 ug/L all year
001Copper, total recoverableMO AVG <= 38 g/d all year
001Copper, total recoverableDAILY MX <= 76 g/d 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
001Chromium, hexavalent dissolved [as Cr]MO AVG <= 21 g/d all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX <= 42 g/d 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 <= 7.4 ug/L all year
001Chlorine, total residualDAILY MX <= 19 ug/L all year
001Chlorine, total residualMO AVG <= 19 g/d all year
001Chlorine, total residualDAILY MX <= 50 g/d all year
001E. coli, colony forming units [CFU]MO AVG <= 126 CFU/100mL all year
001E. coli, colony forming units [CFU]DAILY MX <= 575 CFU/100mL all year
001Hydrogen sulfideMO AVG <= 2 ug/L all year
001Hydrogen sulfideDAILY MX <= 3 ug/L all year
001Hydrogen sulfideMO AVG <= 4 g/d all year
001Hydrogen sulfideDAILY MX <= 9 g/d all year
001Mercury, total recoverableMO AVG <= .008 ug/L all year
001Mercury, total recoverableDAILY MX <= .02 ug/L all year
001Mercury, total recoverableMO AVG <= .02 g/d all year
001Mercury, total recoverableDAILY MX <= .04 g/d all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001Solids, suspended percent removalMO AV MN >= 65 % all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaMO MED <= 0 pass=0;fail=1 all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 0 pass=0;fail=1 all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiaDAILY MX <= 50 % effect all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
001Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitataMO MED report only all year
001Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitataDAILY MX report only all year
001Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitataDAILY MX report only all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFBOD, 5-day, 20 deg. CWKLY AVG report only all year
INFSolids, total suspendedMO AVG report only all year
INFSolids, total suspendedWKLY AVG 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