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Navajo Tribal Utility Authority

Sewage treatment plant, major discharger, Tuba City, NN. NPDES permit NN0020290, in force until Apr 30, 2027. Last 12 months: over a limit 29 times (last August 2026), 12 required values missing, 7 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (50 values), outfall 001 form Q quarterly (6 values), outfall INF form A quarterly (8 values), outfall 001 form Y yearly
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
41 values over a limit, 17 required values missing, 6 of 30 reports late

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

All 29 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average11.14 Ratio≤ 1 Ratio1014%
October 2025Solids, suspended percent removal, monthly average minimum56.3 %≥ 65 %25%
November 2025BOD, 5-day, 20 deg. C, highest weekly average161.2 mg/L≤ 65 mg/L148%
November 2025BOD, 5-day, 20 deg. C, highest weekly average604.5 lb/d≤ 542 lb/d12%
November 2025BOD, 5-day, 20 deg. C, monthly average161.2 mg/L≤ 45 mg/L258%
November 2025BOD, 5-day, 20 deg. C, monthly average584.3 lb/d≤ 375 lb/d56%
November 2025BOD, 5-day, percent removal, monthly average minimum35.4 %≥ 65 %85%
November 2025E. coli, colony forming units [CFU], daily maximum1413.6 CFU/100mL≤ 575 CFU/100mL146%
November 2025E. coli, colony forming units [CFU], geometric mean1413.6 CFU/100mL≤ 126 CFU/100mL1022%
November 2025Solids, suspended percent removal, monthly average minimum61.2 %≥ 65 %11%
December 2025BOD, 5-day, 20 deg. C, highest weekly average90.8 mg/L≤ 65 mg/L40%
December 2025BOD, 5-day, 20 deg. C, monthly average90.8 mg/L≤ 45 mg/L102%
December 2025BOD, 5-day, percent removal, monthly average minimum53.9 %≥ 65 %32%
December 2025E. coli, colony forming units [CFU], daily maximum1732.9 CFU/100mL≤ 575 CFU/100mL201%
December 2025E. coli, colony forming units [CFU], geometric mean1732.9 CFU/100mL≤ 126 CFU/100mL1275%
January 2026BOD, 5-day, 20 deg. C, monthly average62.2 mg/L≤ 45 mg/L38%
January 2026E. coli, colony forming units [CFU], daily maximum980.4 CFU/100mL≤ 575 CFU/100mL71%
January 2026E. coli, colony forming units [CFU], geometric mean980.4 CFU/100mL≤ 126 CFU/100mL678%
January 2026Nitrogen, ammonia total [as N], monthly average23.9 Ratio≤ 1 Ratio2290%
February 2026BOD, 5-day, 20 deg. C, monthly average60.2 mg/L≤ 45 mg/L34%
February 2026E. coli, colony forming units [CFU], geometric mean422.15 CFU/100mL≤ 126 CFU/100mL235%
February 2026Nitrogen, ammonia total [as N], monthly average13.93 Ratio≤ 1 Ratio1293%
March 2026BOD, 5-day, 20 deg. C, highest weekly average66.5 mg/L≤ 65 mg/L2%
March 2026BOD, 5-day, 20 deg. C, monthly average66.5 mg/L≤ 45 mg/L48%
March 2026Nitrogen, ammonia total [as N], monthly average11.6 Ratio≤ 1 Ratio1060%
April 2026BOD, 5-day, 20 deg. C, highest weekly average67.7 mg/L≤ 65 mg/L4%
April 2026BOD, 5-day, 20 deg. C, monthly average67.7 mg/L≤ 45 mg/L50%
April 2026Nitrogen, ammonia total [as N], monthly average14.8 Ratio≤ 1 Ratio1380%
August 2026Nitrogen, ammonia total [as N], monthly average5.52 Ratio≤ 1 Ratio452%

Limits in force (72)

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. Chighest weekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 375 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 375 lb/dall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 542 lb/dall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 542 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≤ 80 mg/Lall year001
Solids, total suspendedmonthly average≤ 80 mg/Lall year001
Solids, total suspendedhighest weekly average≤ 135 mg/Lall year001
Solids, total suspendedhighest weekly average≤ 135 mg/Lall year001
Solids, total suspendedmonthly average≤ 751 lb/dall year001
Solids, total suspendedmonthly average≤ 751 lb/dall year001
Solids, total suspendedhighest weekly average≤ 1126 lb/dall year001
Solids, total suspendedhighest weekly average≤ 1126 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]monthly averagereport only (ug/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (ug/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (ug/L)all year001
Arsenic, total recoverabledaily maximum≤ 30 ug/Lall year001
Arsenic, total recoverabledaily maximum≤ 30 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 2 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 2 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. 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 dissolveddaily maximumreport 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 dissolveddaily maximumreport 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, StatR7d P promelasmonthly medianreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly medianreport 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 maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximumreport only (% effect)all year001
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 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/NN0020290 · MCP: https://passage-data.com/mcp