NAVAJO TRIBAL UTILITY AUTHORITY

NPDES permit NN0020290 · Major POTW · effective, expires 2027-04-30 · 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

32values over a limit
15required values missing, on 5 form(s)
8of 28 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (14), E. coli, colony forming units [CFU] (7), Nitrogen, ammonia total [as N] (6).

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 (72)

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
001BOD, 5-day, 20 deg. CMO AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CHI WK AV <= 65 mg/L all year
001BOD, 5-day, 20 deg. CHI WK AV <= 65 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 375 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG <= 375 lb/d all year
001BOD, 5-day, 20 deg. CHI WK AV <= 542 lb/d all year
001BOD, 5-day, 20 deg. CHI WK AV <= 542 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 <= 80 mg/L all year
001Solids, total suspendedMO AVG <= 80 mg/L all year
001Solids, total suspendedHI WK AV <= 135 mg/L all year
001Solids, total suspendedHI WK AV <= 135 mg/L all year
001Solids, total suspendedMO AVG <= 751 lb/d all year
001Solids, total suspendedMO AVG <= 751 lb/d all year
001Solids, total suspendedHI WK AV <= 1126 lb/d all year
001Solids, total suspendedHI WK AV <= 1126 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
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverableDAILY MX <= 30 ug/L all year
001Arsenic, total recoverableDAILY MX <= 30 ug/L all year
001Selenium, total recoverableDAILY MX <= 2 ug/L all year
001Selenium, total recoverableDAILY MX <= 2 ug/L 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 residualDAILY MX <= 11 ug/L all year
001Chlorine, total residualDAILY MX <= 11 ug/L all year
001E. coli, colony forming units [CFU]GEO MEAN <= 126 CFU/100mL all year
001E. coli, colony forming units [CFU]GEO MEAN <= 126 CFU/100mL all year
001E. coli, colony forming units [CFU]DAILY MX <= 575 CFU/100mL all year
001E. coli, colony forming units [CFU]DAILY MX <= 575 CFU/100mL all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001Solids, suspended 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, StatR7d P promelasMO MED report only all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED report only all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX report only all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX report only all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX report only all year
001Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P 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