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Navajo Tribal Utility Authority

Sewage treatment plant, Kayenta, NN. NPDES permit NN0020281, in force until Jan 31, 2029. Last 12 months: over a limit 27 times (last December 2025), 18 required values missing, 5 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (62 values), outfall 001 form Q quarterly (3 values), outfall INF form A quarterly (12 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
23 values over a limit, 21 required values missing, 4 of 29 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 27 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average84.4 mg/L≤ 45 mg/L88%
October 2025BOD, 5-day, 20 deg. C, weekly average84.4 mg/L≤ 65 mg/L30%
October 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
October 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
October 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
October 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
October 2025E. coli, daily maximum> 2419.6 CFU/100mL≤ 235 CFU/100mL—
October 2025E. coli, geometric mean1005.21 CFU/100mL≤ 126 CFU/100mL698%
October 2025Nitrogen, ammonia total [as N], monthly average19.88 Ratio≤ 1 Ratio1888%
November 2025BOD, 5-day, 20 deg. C, monthly average79 mg/L≤ 45 mg/L76%
November 2025BOD, 5-day, 20 deg. C, weekly average79 mg/L≤ 65 mg/L22%
November 2025Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia, monthly median1 pass=0;fail=1≤ 0 pass=0;fail=1—
November 2025E. coli, daily maximum2419.6 CFU/100mL≤ 235 CFU/100mL930%
November 2025Nitrogen, ammonia total [as N], monthly average28.2 Ratio≤ 1 Ratio2720%
December 2025BOD, 5-day, 20 deg. C, monthly average97.6 mg/L≤ 45 mg/L117%
December 2025BOD, 5-day, 20 deg. C, weekly average870.03 lb/d≤ 477 lb/d82%
December 2025BOD, 5-day, 20 deg. C, weekly average97.6 mg/L≤ 65 mg/L50%
December 2025BOD, 5-day, percent removal, monthly average minimum14.6 %≥ 65 %144%
December 2025E. coli, daily maximum> 2419.6 CFU/100mL≤ 235 CFU/100mL—
December 2025E. coli, geometric mean1381.98 CFU/100mL≤ 126 CFU/100mL997%
December 2025Nitrogen, ammonia total [as N], monthly average15.6 Ratio≤ 1 Ratio1460%
December 2025Solids, suspended percent removal, monthly average minimum0 %≥ 65 %186%

Limits in force (89)

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≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 328 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 328 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 477 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 477 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≤ 90 mg/Lall year001
Solids, total suspendedmonthly average≤ 90 mg/Lall year001
Solids, total suspendedweekly average≤ 135 mg/Lall year001
Solids, total suspendedweekly average≤ 135 mg/Lall year001
Solids, total suspendedmonthly average≤ 661 lb/dall year001
Solids, total suspendedmonthly average≤ 661 lb/dall year001
Solids, total suspendedweekly average≤ 991 lb/dall year001
Solids, total suspendedweekly average≤ 991 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
Cadmium, total recoverabledaily maximum≤ .43 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
Chlorine, total residualdaily maximum≤ 11 ug/Lall year001
Chlorine, total residualdaily maximum≤ 11 ug/Lall year001
E. coligeometric mean≤ 126 CFU/100mLall year001
E. coligeometric mean≤ 126 CFU/100mLall year001
E. colidaily maximum≤ 235 CFU/100mLall year001
E. colidaily maximum≤ 235 CFU/100mLall year001
Solids, total dissolvedmonthly averagereport 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 dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport 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 dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport 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 dissolveddaily maximumreport only (mg/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %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. Cweekly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cweekly averagereport 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 suspendedweekly averagereport only (mg/L)all yearINF
Solids, total suspendedweekly averagereport 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/NN0020281 · MCP: https://passage-data.com/mcp