WINCHENDON W P C F
NPDES ID: MAG590017
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: 9 effluent violations.
Violations
May 31, 2026
Copper, total [as Cu]
48% over limit
Discharged 0.0031 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
38% over limit
Discharged 0.0036 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli
174% over limit
Discharged 1119 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
E. coli
1275% over limit
Discharged 1733 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
12% over limit
Discharged 0.0029 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
25% over limit
Discharged 81.2 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
491% over limit
Discharged 2419 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
19% over limit
Discharged 0.0025 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
88% over limit
Discharged 47 mg/L against a permitted limit of 25 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Copper, total [as Cu]
200% over limit
Discharged 0.0063 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
227% over limit
Discharged 0.0085 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static Renewal 48Hr Acute Pimephales promelas
33% over limit
Discharged 67.1 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
61% over limit
Discharged 75.8 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total [as Cu]
108% over limit
Discharged 0.0054 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
23% over limit
Discharged 30.7 mg/L against a permitted limit of 25 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
129% over limit
Discharged 0.0048 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
22% over limit
Discharged 18.3 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total [as Cu]
57% over limit
Discharged 0.0033 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
58% over limit
Discharged 0.0041 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli
88% over limit
Discharged 770 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli
275% over limit
Discharged 1533 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
14% over limit
Discharged 0.0024 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
159% over limit
Discharged 326 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, suspended percent removal
38% over limit
Discharged 79.3 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
17% over limit
Discharged 82.4 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
25% over limit
Discharged 158 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
E. coli
491% over limit
Discharged 2419 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
304% over limit
Discharged 0.0105 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
229% over limit
Discharged 0.0069 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Lead, total [as Pb]
320% over limit
Discharged 0.0021 mg/L against a permitted limit of 0.0005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total [as Cu]
54% over limit
Discharged 0.004 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
52% over limit
Discharged 0.0032 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Copper, total [as Cu]
115% over limit
Discharged 0.0056 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
129% over limit
Discharged 0.0048 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Copper, total [as Cu]
86% over limit
Discharged 0.0039 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
77% over limit
Discharged 0.0046 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Copper, total [as Cu]
10% over limit
Discharged 0.0023 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Copper, total [as Cu]
76% over limit
Discharged 0.0037 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
123% over limit
Discharged 0.0058 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Copper, total [as Cu]
46% over limit
Discharged 0.0038 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
67% over limit
Discharged 0.0035 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Copper, total [as Cu]
138% over limit
Discharged 0.005 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
131% over limit
Discharged 0.006 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Copper, total [as Cu]
169% over limit
Discharged 0.007 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
181% over limit
Discharged 0.0059 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
88% over limit
Discharged 770 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Copper, total [as Cu]
119% over limit
Discharged 0.0057 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli
19% over limit
Discharged 488 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
148% over limit
Discharged 0.0052 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Copper, total [as Cu]
69% over limit
Discharged 0.0044 mg/L against a permitted limit of 0.0026 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
52% over limit
Discharged 0.0032 mg/L against a permitted limit of 0.0021 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)