NAVAJO TRIBAL UTILITY AUTHORITY

NPDES permit NN0020265 · Minor POTW · effective, expires 2031-08-31 · 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

61values over a limit
25required values missing, on 5 form(s)
9of 26 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (35), E. coli (12), Nitrogen, ammonia total [as N] (11).

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 (102)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001TurbidityMO AVG report only all year
001TurbidityDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 150.21 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG <= 150.21 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 225.32 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 225.32 lb/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 150.21 lb/d all year
001Solids, total suspendedMO AVG <= 150.21 lb/d all year
001Solids, total suspendedWKLY AVG <= 225.32 lb/d all year
001Solids, total suspendedWKLY AVG <= 225.32 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG report only 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]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1 Ratio all year
001Nitrogen, ammonia total [as N]MO AVG <= 1 Ratio all year
001Nitrogen, ammonia total [as N]DAILY MX <= 1 Ratio all year
001Nitrogen, ammonia total [as N]DAILY MX <= 1 Ratio 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
001Selenium, total recoverableMO AVG report only all year
001Selenium, total recoverableDAILY MX report only all year
001AcroleinMO AVG report only all year
001AcroleinDAILY MX report only all year
001Bis[2-chloroethyl] etherMO AVG report only all year
001Bis[2-chloroethyl] etherDAILY MX report only all year
0011,2-DiphenylhydrazineMO AVG report only all year
0011,2-DiphenylhydrazineDAILY MX report only all year
001Endosulfan sulfateMO AVG report only all year
001Endosulfan sulfateDAILY MX report only all year
001Endrin aldehydeMO AVG report only all year
001Endrin aldehydeDAILY MX report only all year
001DieldrinMO AVG report only all year
001DieldrinDAILY MX report only all year
001EndrinMO AVG report only all year
001EndrinDAILY MX report only all year
001HeptachlorMO AVG report only all year
001HeptachlorDAILY MX report only all year
001Heptachlor epoxideMO AVG report only all year
001Heptachlor epoxideDAILY MX report only all year
001HexachlorobenzeneMO AVG report only all year
001HexachlorobenzeneDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only 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
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG report only all year
001Chlorine, total residualMO AVG report only all year
001Chlorine, total residualDAILY MX <= 11 ug/L all year
001Chlorine, total residualDAILY MX <= 11 ug/L all year
001E. coliMO GEOMN <= 126 CFU/100mL all year
001E. coliMO GEOMN <= 126 CFU/100mL all year
001E. coliDAILY MX <= 575 CFU/100mL all year
001E. coliDAILY MX <= 575 CFU/100mL all year
0014-Chloro-3-methylphenolMO AVG report only all year
0014-Chloro-3-methylphenolDAILY MX report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total recoverableMO AVG report only all year
001Mercury, total recoverableDAILY MX report only all year
001BOD, 5-day, percent removalMO MIN >= 85 % all year
001BOD, 5-day, percent removalMO MIN >= 85 % all year
001Solids, suspended percent removalMO MIN >= 85 % all year
001Solids, suspended percent removalMO MIN >= 85 % all year
001Pass/Fail Static 4 Day Chronic Raphidocelis subcapitataMO MED <= 0 pass=0;fail=1 all year
001Pass/Fail Static 4 Day Chronic Raphidocelis subcapitataMO MED <= 0 pass=0;fail=1 all year
001Pass/Fail Static 4 Day Chronic Raphidocelis subcapitataDAILY MX report only all year
001Pass/Fail Static 4 Day Chronic Raphidocelis subcapitataDAILY MX report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasMO AVG report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasMO AVG report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX report only all year
INFBOD, 5-day, 20 deg. CDAILY MX report only all year
INFBOD, 5-day, 20 deg. CDAILY MX report only all year
INFSolids, total suspendedDAILY MX report only all year
INFSolids, total suspendedDAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year
INFFlow, in conduit or thru treatment plantDAILY 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