GREAT POND POND WTP
NPDES ID: MAG640031
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: 5 effluent violations.
Violations
May 31, 2026
pH
0% over limit
Discharged 5.53 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2026
Aluminum, total [as Al]
117% over limit
Discharged 0.82480004 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
37% over limit
Discharged 1.34000006 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Aluminum, total [as Al]
2% over limit
Discharged 0.38670002 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.7 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2026
Aluminum, total [as Al]
109% over limit
Discharged 2.0400001 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
281% over limit
Discharged 1.44800007 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Aluminum, total [as Al]
960% over limit
Discharged 4.02850019 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 66 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
1096% over limit
Discharged 11.70000056 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Fluorine, adsorbable organic
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Aluminum, total [as Al]
85% over limit
Discharged 0.70400003 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
42% over limit
Discharged 1.39000007 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.8 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
Aluminum, total [as Al]
15% over limit
Discharged 0.43700002 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.7 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2025
pH
0% over limit
Discharged 6.2 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
36% over limit
Discharged 0.51600002 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
pH
0% over limit
Discharged 5.92 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
34% over limit
Discharged 1.31000006 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
59% over limit
Discharged 0.60600003 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
pH
0% over limit
Discharged 6.34 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2025
Aluminum, total [as Al]
36% over limit
Discharged 0.51860002 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.2 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
Aluminum, total [as Al]
148% over limit
Discharged 0.94200004 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
92% over limit
Discharged 1.88000009 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Aluminum, total [as Al]
117% over limit
Discharged 0.82450004 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
5% over limit
Discharged 1.03000005 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Aluminum, total [as Al]
86% over limit
Discharged 0.70540003 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Aluminum, total [as Al]
125% over limit
Discharged 0.85625004 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
50% over limit
Discharged 1.47000007 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Aluminum, total [as Al]
143% over limit
Discharged 0.92150004 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
42% over limit
Discharged 1.39000007 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Aluminum, total [as Al]
62% over limit
Discharged 1.58000008 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
218% over limit
Discharged 1.20780006 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Aluminum, total [as Al]
300% over limit
Discharged 3.91000019 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
371% over limit
Discharged 1.79100009 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Aluminum, total [as Al]
310% over limit
Discharged 4.01000019 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
332% over limit
Discharged 1.64075008 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Aluminum, total [as Al]
181% over limit
Discharged 1.06600005 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
72% over limit
Discharged 1.68000008 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Aluminum, total [as Al]
165% over limit
Discharged 1.00700005 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
64% over limit
Discharged 1.60000008 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
pH
0% over limit
Discharged 6.46 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
239% over limit
Discharged 1.28700006 mg/L against a permitted limit of 0.38000002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
156% over limit
Discharged 2.50000012 mg/L against a permitted limit of 0.97800005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)