ST.REGIS MOHAWK TRIBE WWTP
NPDES ID: SR0240281
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 11 effluent violations.
Violations
June 30, 2026
BOD, 5-day, 20 deg. C
51% over limit
Discharged 68 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
26% over limit
Discharged 0.63 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
20% over limit
Discharged 36 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
E. coli
1476% over limit
Discharged 1986.3 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Chlorine, total residual
38% over limit
Discharged 0.69 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 36.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 56.2 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, suspended percent removal
12% over limit
Discharged 83.27 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 34.35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
38% over limit
Discharged 0.69 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chlorine, total residual
14% over limit
Discharged 0.57 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Chlorine, total residual
4% over limit
Discharged 0.52 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
pH
0% over limit
Discharged 8.6 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
30% over limit
Discharged 39 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, 5-day, 20 deg. C
107% over limit
Discharged 62 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
43% over limit
Discharged 43 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
49% over limit
Discharged 67 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
64% over limit
Discharged 74 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, 5-day, 20 deg. C
162% over limit
Discharged 78.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
78% over limit
Discharged 80 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
12% over limit
Discharged 44.58279963 kg/d against a permitted limit of 39.75677967 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Chromium, total [as Cr]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 7.56 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4.34477996 kg/d against a permitted limit of 39.75677967 kg/d (MO AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.114 MGD against a permitted limit of 0.35 MGD (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 350 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 5.65 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.0076 mg/L against a permitted limit of 0.49 mg/L (MO AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 12.92 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 812 mg/L against a permitted limit of 0 mg/L (WKLY AVG)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.001 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 8.86 mg/L against a permitted limit of 0 mg/L (MINIMUM)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.001 mg/L against a permitted limit of 0.94 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.0081 mg/L against a permitted limit of 1.34 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 5.35719995 kg/d against a permitted limit of 59.6328995 kg/d (WKLY AVG)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 97.8 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.46 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 5.24823996 kg/d against a permitted limit of 59.6328995 kg/d (WKLY AVG)
DMR, Limited - Overdue
Chromium, total [as Cr]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 20.9 mg/L (DAILY MX)
DMR, Limited - Overdue
Benzene
0% over limit
Discharged 0.0005 mg/L against a permitted limit of 0.01 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 8.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 10.1 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4.66257996 kg/d against a permitted limit of 39.75677967 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 442 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.034 mg/L against a permitted limit of 0.94 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.5 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.032 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.9 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9.9 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 14.2 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9.57 mg/L against a permitted limit of 6 mg/L (MO AV MN)
DMR, Limited - Overdue
Aluminum, total [as Al]
0% over limit
Discharged 0.083 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 510 mg/L against a permitted limit of 0 mg/L (WKLY AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 9.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
June 30, 2025
BOD, 5-day, 20 deg. C
0% over limit
Discharged 190 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Aluminum, total [as Al]
0% over limit
Discharged 0.13 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 5.65 mg/L (MO AVG)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.001 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.48 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.023 mg/L against a permitted limit of 0.94 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 14.2 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 8.79 mg/L against a permitted limit of 0 mg/L (MINIMUM)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 3.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 1.99759998 kg/d against a permitted limit of 39.75677967 kg/d (MO AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 12.93 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 1.18039999 kg/d against a permitted limit of 39.75677967 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 99 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 2.22459998 kg/d against a permitted limit of 59.6328995 kg/d (WKLY AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.72 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Chromium, total [as Cr]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 7.56 mg/L (MO AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.12 MGD against a permitted limit of 0.35 MGD (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9.74 mg/L against a permitted limit of 6 mg/L (MO AV MN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 2.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Benzene
0% over limit
Discharged 0.0005 mg/L against a permitted limit of 0.01 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 240 mg/L against a permitted limit of 0 mg/L (WKLY AVG)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.0035 mg/L against a permitted limit of 0.49 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, total [as Cr]
0% over limit
Discharged 0.005 mg/L against a permitted limit of 20.9 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.55 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 1.58899999 kg/d against a permitted limit of 59.6328995 kg/d (WKLY AVG)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.001 mg/L against a permitted limit of 0.94 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 136 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.023 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 186 mg/L against a permitted limit of 0 mg/L (WKLY AVG)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.0037 mg/L against a permitted limit of 1.34 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4.9 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
May 31, 2025
E. coli
222% over limit
Discharged 406.09 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli
8% over limit
Discharged 135.7 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, suspended percent removal
47% over limit
Discharged 77.9 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
140% over limit
Discharged 108 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
88% over limit
Discharged 56.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
503% over limit
Discharged 9.6 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, suspended percent removal
19% over limit
Discharged 82.2 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 16, 2026 (13 minutes ago)