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Navajo Tribal Utility Authority

Sewage treatment plant, Flagstaff, NN. NPDES permit NN0030344, in force until Oct 30, 2028. Last 12 months: no values over a limit, 3 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (60 values), outfall INF form A quarterly (12 values), outfall 001 form Y yearly
Renewal application due
May 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 18 required values missing, 3 of 25 reports late

Limits in force (82)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 31.3 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 31.3 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 47 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 47 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 31.3 lb/dall year001
Solids, total suspendedmonthly average≤ 31.3 lb/dall year001
Solids, total suspendedweekly average≤ 47 lb/dall year001
Solids, total suspendedweekly average≤ 47 lb/dall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year001
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year001
Hardness, total [as CaCO3]monthly averagereport only (ug/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximum≤ 228.6 ug/Lall year001
Copper, total recoverabledaily maximum≤ 17.6 ug/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. coli, colony forming units [CFU]geometric mean≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]geometric mean≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum< 50 % effectall year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximum< 50 % effectall year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum< 50 % effectall year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum< 50 % effectall year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum< 50 % effectall year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum< 50 % effectall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

Cited limits by parameter: the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NN0030344 · MCP: https://passage-data.com/mcp