TUBA CITY WWTF
NPDES ID: NN0020290
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 3 effluent violations, 1 single-event violation.
Violations
April 30, 2026
BOD, 5-day, 20 deg. C
4% over limit
Discharged 67.7 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
50% over limit
Discharged 67.7 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1380% over limit
Discharged 14800000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, 5-day, 20 deg. C
2% over limit
Discharged 66.5 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1060% over limit
Discharged 11600000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
48% over limit
Discharged 66.5 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
E. coli, colony forming units [CFU]
235% over limit
Discharged 422.15 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
34% over limit
Discharged 60.2 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1293% over limit
Discharged 13930000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
E. coli, colony forming units [CFU]
71% over limit
Discharged 980.4 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
38% over limit
Discharged 62.2 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
678% over limit
Discharged 980.4 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2290% over limit
Discharged 23900000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
E. coli, colony forming units [CFU]
201% over limit
Discharged 1732.9 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
102% over limit
Discharged 90.8 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
40% over limit
Discharged 90.8 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
32% over limit
Discharged 53.9 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
1275% over limit
Discharged 1732.9 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
November 30, 2025
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Solids, suspended percent removal
11% over limit
Discharged 61.2 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
12% over limit
Discharged 274.44299769 kg/d against a permitted limit of 246.06799793 kg/d (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
85% over limit
Discharged 35.4 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
56% over limit
Discharged 265.27219777 kg/d against a permitted limit of 170.24999857 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
148% over limit
Discharged 161.2 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
258% over limit
Discharged 161.2 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
146% over limit
Discharged 1413.6 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
1022% over limit
Discharged 1413.6 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
October 31, 2025
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
Solids, suspended percent removal
25% over limit
Discharged 56.3 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
1014% over limit
Discharged 11140000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, 5-day, percent removal
59% over limit
Discharged 44.2 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
6% over limit
Discharged 69 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
627% over limit
Discharged 7270000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
53% over limit
Discharged 69 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
482% over limit
Discharged 5820000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
19% over limit
Discharged 203.30119829 kg/d against a permitted limit of 170.24999857 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
87% over limit
Discharged 121.3 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
87% over limit
Discharged 34.7 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
27% over limit
Discharged 55.7 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
170% over limit
Discharged 121.3 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
1372% over limit
Discharged 14720000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
21% over limit
Discharged 57.7 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 55.9 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
June 30, 2025
Solids, suspended percent removal
23% over limit
Discharged 57 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
60% over limit
Discharged 104.1 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
62% over limit
Discharged 43.2 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
2% over limit
Discharged 173.65499854 kg/d against a permitted limit of 170.24999857 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
2% over limit
Discharged 173.65499854 kg/d against a permitted limit of 170.24999857 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
131% over limit
Discharged 104.1 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
1121% over limit
Discharged 12210000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
May 31, 2025
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
89% over limit
Discharged 84.9 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
31% over limit
Discharged 84.9 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 1 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
E. coli, colony forming units [CFU]
88% over limit
Discharged 237.12 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
40% over limit
Discharged 51.1 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Overdue
Solids, suspended percent removal
40% over limit
Discharged 51.1 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1261% over limit
Discharged 13610000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
110% over limit
Discharged 94.3 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
25% over limit
Discharged 157.6 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 94.3 mg/L against a permitted limit of 65 mg/L (HI WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
3% over limit
Discharged 63.8 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2083% over limit
Discharged 21830000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, 5-day, 20 deg. C
25% over limit
Discharged 56.1 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
83% over limit
Discharged 231 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1107% over limit
Discharged 12070000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, suspended percent removal
26% over limit
Discharged 55.9 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 49.5 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1435% over limit
Discharged 15350000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, suspended percent removal
25% over limit
Discharged 56.4 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1134% over limit
Discharged 12340000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
41% over limit
Discharged 1410000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
pH
0% over limit
Discharged 9.6 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli, colony forming units [CFU]
22% over limit
Discharged 153.4 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 9.56 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
6% over limit
Discharged 47.9 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
226% over limit
Discharged 3260000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (DAILY MX)
DMR, Monitor Only - Overdue
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
23% over limit
Discharged 55.35 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)