Navajo Tribal Utility Authority — NPDES permit NN0020265: limits, due date and EPA's record

Sewage treatment plant, Chinle, NN. NPDES permit NN0020265, in force until Aug 31, 2031. Last 12 months: over a limit 58 times (last July 2026), 11 required values missing, 7 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

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

Limits in force (108)

Period ending	Parameter	Reported	Limit	Over by
October 2025	Nitrogen, ammonia total [as N], monthly average	12.35 Ratio	≤ 1 Ratio	1135%
November 2025	BOD, 5-day, 20 deg. C, highest weekly average	189.31 kg/d	≤ 57 kg/d	232%
November 2025	BOD, 5-day, 20 deg. C, highest weekly average	65.9 mg/L	≤ 65 mg/L	1%
November 2025	BOD, 5-day, 20 deg. C, monthly average	45.57 kg/d	≤ 39 kg/d	17%
November 2025	BOD, 5-day, 20 deg. C, monthly average	65.9 mg/L	≤ 45 mg/L	46%
November 2025	Nitrogen, ammonia total [as N], monthly average	9.15 Ratio	≤ 1 Ratio	815%
December 2025	BOD, 5-day, 20 deg. C, highest weekly average	138.1 kg/d	≤ 57 kg/d	142%
December 2025	BOD, 5-day, 20 deg. C, monthly average	48.8 kg/d	≤ 39 kg/d	25%
December 2025	BOD, 5-day, 20 deg. C, monthly average	57.1 mg/L	≤ 45 mg/L	27%
December 2025	Nitrogen, ammonia total [as N], monthly average	10.03 Ratio	≤ 1 Ratio	903%
January 2026	BOD, 5-day, 20 deg. C, highest weekly average	116.9 kg/d	≤ 57 kg/d	105%
January 2026	BOD, 5-day, 20 deg. C, highest weekly average	65.8 mg/L	≤ 65 mg/L	1%
January 2026	BOD, 5-day, 20 deg. C, monthly average	65.8 mg/L	≤ 45 mg/L	46%
January 2026	BOD, 5-day, 20 deg. C, monthly average	74.4 kg/d	≤ 39 kg/d	91%
January 2026	E. coli, daily maximum	980.4 CFU/100mL	≤ 575 CFU/100mL	71%
January 2026	E. coli, geometric mean	980.4 CFU/100mL	≤ 126 CFU/100mL	678%
January 2026	Nitrogen, ammonia total [as N], monthly average	5.6 Ratio	≤ 1 Ratio	460%
February 2026	BOD, 5-day, 20 deg. C, highest weekly average	143.7 kg/d	≤ 57 kg/d	152%
February 2026	BOD, 5-day, 20 deg. C, highest weekly average	77.6 mg/L	≤ 65 mg/L	19%
February 2026	BOD, 5-day, 20 deg. C, monthly average	73.6 kg/d	≤ 39 kg/d	89%
February 2026	BOD, 5-day, 20 deg. C, monthly average	77.6 mg/L	≤ 45 mg/L	72%
February 2026	E. coli, daily maximum	2419.6 CFU/100mL	≤ 575 CFU/100mL	321%
February 2026	E. coli, geometric mean	794.3 CFU/100mL	≤ 126 CFU/100mL	530%
February 2026	Nitrogen, ammonia total [as N], monthly average	13.2 Ratio	≤ 1 Ratio	1220%
March 2026	BOD, 5-day, 20 deg. C, highest weekly average	367 kg/d	≤ 57 kg/d	544%
March 2026	BOD, 5-day, 20 deg. C, highest weekly average	83.7 mg/L	≤ 65 mg/L	29%
March 2026	BOD, 5-day, 20 deg. C, monthly average	101.9 kg/d	≤ 39 kg/d	161%
March 2026	BOD, 5-day, 20 deg. C, monthly average	83.7 mg/L	≤ 45 mg/L	86%
March 2026	E. coli, geometric mean	223 CFU/100mL	≤ 126 CFU/100mL	77%
March 2026	Nitrogen, ammonia total [as N], monthly average	11.24 Ratio	≤ 1 Ratio	1024%
March 2026	Solids, total suspended, highest weekly average	163.1 kg/d	≤ 118 kg/d	38%
April 2026	BOD, 5-day, 20 deg. C, highest weekly average	161.7 kg/d	≤ 57 kg/d	184%
April 2026	BOD, 5-day, 20 deg. C, highest weekly average	97.2 mg/L	≤ 65 mg/L	50%
April 2026	BOD, 5-day, 20 deg. C, monthly average	89.6 kg/d	≤ 39 kg/d	130%
April 2026	BOD, 5-day, 20 deg. C, monthly average	97.2 mg/L	≤ 45 mg/L	116%
April 2026	E. coli, daily maximum	< 2419.6 CFU/100mL	≤ 575 CFU/100mL	321%
April 2026	E. coli, geometric mean	< 2419.6 CFU/100mL	≤ 126 CFU/100mL	1820%
April 2026	Nitrogen, ammonia total [as N], monthly average	14.56 Ratio	≤ 1 Ratio	1356%
May 2026	BOD, 5-day, 20 deg. C, highest weekly average	358.5 kg/d	≤ 57 kg/d	529%
May 2026	BOD, 5-day, 20 deg. C, highest weekly average	71.3 mg/L	≤ 65 mg/L	10%
May 2026	BOD, 5-day, 20 deg. C, monthly average	71.3 mg/L	≤ 45 mg/L	58%
May 2026	BOD, 5-day, 20 deg. C, monthly average	74.4 kg/d	≤ 39 kg/d	91%
May 2026	E. coli, daily maximum	2419.6 CFU/100mL	≤ 575 CFU/100mL	321%
May 2026	E. coli, geometric mean	2419.6 CFU/100mL	≤ 126 CFU/100mL	1820%
May 2026	Nitrogen, ammonia total [as N], monthly average	22.14 Ratio	≤ 1 Ratio	2114%
May 2026	Solids, total suspended, highest weekly average	177 kg/d	≤ 118 kg/d	50%
June 2026	BOD, 5-day, 20 deg. C, highest weekly average	222.6 kg/d	≤ 57 kg/d	291%
June 2026	BOD, 5-day, 20 deg. C, highest weekly average	71.8 mg/L	≤ 65 mg/L	10%
June 2026	BOD, 5-day, 20 deg. C, monthly average	56.7 kg/d	≤ 39 kg/d	45%
June 2026	BOD, 5-day, 20 deg. C, monthly average	71.8 mg/L	≤ 45 mg/L	60%
June 2026	E. coli, geometric mean	511.2 CFU/100mL	≤ 126 CFU/100mL	306%
June 2026	Nitrogen, ammonia total [as N], monthly average	15.7 Ratio	≤ 1 Ratio	1470%
June 2026	Solids, total suspended, highest weekly average	131.7 kg/d	≤ 118 kg/d	12%
July 2026	BOD, 5-day, 20 deg. C, highest weekly average	69.6 kg/d	≤ 57 kg/d	22%
July 2026	BOD, 5-day, 20 deg. C, monthly average	46 mg/L	≤ 45 mg/L	2%
July 2026	E. coli, daily maximum	2419.6 CFU/100mL	≤ 575 CFU/100mL	321%
July 2026	E. coli, geometric mean	1027.8 CFU/100mL	≤ 126 CFU/100mL	716%
July 2026	Nitrogen, ammonia total [as N], monthly average	21.07 Ratio	≤ 1 Ratio	2007%

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	monthly average	report only (deg C)	all year	001
Temperature, water deg. centigrade	monthly average	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
Turbidity	monthly average	report only (NTU)	all year	001
Turbidity	daily maximum	report only (NTU)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 150.21 lb/d	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 150.21 lb/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 225.32 lb/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 225.32 lb/d	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 150.21 lb/d	all year	001
Solids, total suspended	monthly average	≤ 150.21 lb/d	all year	001
Solids, total suspended	weekly average	≤ 225.32 lb/d	all year	001
Solids, total suspended	weekly average	≤ 225.32 lb/d	all year	001
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1 Ratio	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1 Ratio	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 1 Ratio	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 1 Ratio	all year	001
Cyanide, total [as CN]	monthly average	report only (ug/L)	all year	001
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	001
Hardness, total [as CaCO3]	monthly average	report only (mg/L)	all year	001
Hardness, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Selenium, total recoverable	monthly average	report only (ug/L)	all year	001
Selenium, total recoverable	daily maximum	report only (ug/L)	all year	001
Acrolein	monthly average	report only (mg/L)	all year	001
Acrolein	daily maximum	report only (mg/L)	all year	001
Bis[2-chloroethyl] ether	monthly average	report only (ug/L)	all year	001
Bis[2-chloroethyl] ether	daily maximum	report only (ug/L)	all year	001
1,2-Diphenylhydrazine	monthly average	report only (ug/L)	all year	001
1,2-Diphenylhydrazine	daily maximum	report only (ug/L)	all year	001
Endosulfan sulfate	monthly average	report only (ug/L)	all year	001
Endosulfan sulfate	daily maximum	report only (ug/L)	all year	001
Endrin aldehyde	monthly average	report only (ug/L)	all year	001
Endrin aldehyde	daily maximum	report only (ug/L)	all year	001
Dieldrin	monthly average	report only (ug/L)	all year	001
Dieldrin	daily maximum	report only (ug/L)	all year	001
Endrin	monthly average	report only (ug/L)	all year	001
Endrin	daily maximum	report only (ug/L)	all year	001
Heptachlor	monthly average	report only (ug/L)	all year	001
Heptachlor	daily maximum	report only (ug/L)	all year	001
Heptachlor epoxide	monthly average	report only (ug/L)	all year	001
Heptachlor epoxide	daily maximum	report only (ug/L)	all year	001
Hexachlorobenzene	monthly average	report only (ug/L)	all year	001
Hexachlorobenzene	daily maximum	report only (ug/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	monthly average	report only (ug/L)	all year	001
Chlorine, total residual	monthly average	report only (ug/L)	all year	001
Chlorine, total residual	daily maximum	≤ 11 ug/L	all year	001
Chlorine, total residual	daily maximum	≤ 11 ug/L	all year	001
E. coli	monthly geometric mean	≤ 126 CFU/100mL	all year	001
E. coli	monthly geometric mean	≤ 126 CFU/100mL	all year	001
E. coli	daily maximum	≤ 575 CFU/100mL	all year	001
E. coli	daily maximum	≤ 575 CFU/100mL	all year	001
4-Chloro-3-methylphenol	monthly average	report only (ug/L)	all year	001
4-Chloro-3-methylphenol	daily maximum	report only (ug/L)	all year	001
Solids, total dissolved	monthly average	report only (mg/L)	all year	001
Solids, total dissolved	daily maximum	report only (mg/L)	all year	001
Mercury, total recoverable	monthly average	report only (ug/L)	all year	001
Mercury, total recoverable	daily maximum	report only (ug/L)	all year	001
BOD, 5-day, percent removal	monthly minimum	≥ 85 %	all year	001
BOD, 5-day, percent removal	monthly minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly minimum	≥ 85 %	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	daily maximum	< 50 % effect	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia	daily maximum	< 50 % effect	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	daily maximum	< 50 % effect	all year	001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	daily maximum	< 50 % effect	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	monthly median	≤ 0 pass=0;fail=1	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	daily maximum	report only (pass=0;fail=1)	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	daily maximum	< 50 % effect	all year	001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata	daily maximum	< 50 % effect	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	INF
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	INF
Solids, total suspended	daily maximum	report only (mg/L)	all year	INF
Solids, total suspended	daily maximum	report only (mg/L)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	INF

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/NN0020265 · MCP: https://passage-data.com/mcp