CHICOPEE W P C F
NPDES ID: MA0101508
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: 6 effluent violations.
Violations
May 31, 2026
BOD, 5-day, 20 deg. C
43% over limit
Discharged 43 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
23% over limit
Discharged 55.2 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
21% over limit
Discharged 0.10567001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, 5-day, 20 deg. C
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
26% over limit
Discharged 56.8 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
17% over limit
Discharged 0.102 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Aluminum, total [as Al]
4% over limit
Discharged 0.09022 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
6% over limit
Discharged 93.8 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
38% over limit
Discharged 62.3 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
7% over limit
Discharged 48.1 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 0 SU (MAX BDL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
64% over limit
Discharged 73.7 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
71% over limit
Discharged 0.14860001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 0 SU (MINIMUM)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
83% over limit
Discharged 55 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
November 30, 2025
BOD, 5-day, 20 deg. C
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
22% over limit
Discharged 55 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
57% over limit
Discharged 43.5 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
93% over limit
Discharged 0.16800001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, 5-day, 20 deg. C
3% over limit
Discharged 1820.9939847 kg/d against a permitted limit of 1760.61198521 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
99% over limit
Discharged 0.17300001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
Limit violation
Discharged 124 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
20% over limit
Discharged 36 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
187% over limit
Discharged 86 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
38% over limit
Discharged 174 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
Limit violation
Discharged 2387.13197994 kg/d against a permitted limit of 2640.91797781 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
September 30, 2025
BOD, 5-day, 20 deg. C
127% over limit
Discharged 68 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
105% over limit
Discharged 0.17800001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
72% over limit
Discharged 77.3 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Aluminum, total [as Al]
57% over limit
Discharged 0.13675001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
73% over limit
Discharged 77.8 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
130% over limit
Discharged 69 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Carbon, dissolved organic [as C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Chlorine, total residual
92% over limit
Discharged 1.92 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
29% over limit
Discharged 71.4 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
July 31, 2025
BOD, 5-day, 20 deg. C
39% over limit
Discharged 62.4 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
21% over limit
Discharged 0.105 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
E. coli
Limit violation
Discharged 533 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, nitrite total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
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]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
LC50 Static 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Overdue
Nitrogen, nitrite total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
E. coli
9% over limit
Discharged 137 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 0 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 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Cadmium, total [as Cd]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Hardness, total [as CaCO3]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
26% over limit
Discharged 56.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, nitrate total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, nitrate total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 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 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
May 31, 2025
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
Aluminum, total [as Al]
18% over limit
Discharged 0.103 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
36% over limit
Discharged 61 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
20% over limit
Discharged 1.2 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
60% over limit
Discharged 48 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, 5-day, 20 deg. C
67% over limit
Discharged 50 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
9% over limit
Discharged 0.0946 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 267 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
36% over limit
Discharged 61.4 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 267 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
36% over limit
Discharged 61.2 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
31% over limit
Discharged 69.5 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
50% over limit
Discharged 45 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
24% over limit
Discharged 0.10750001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
3% over limit
Discharged 46.5 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
BOD, 5-day, 20 deg. C
12% over limit
Discharged 50.4 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
7% over limit
Discharged 0.09325 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 36 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
E. coli
Limit violation
Discharged 267 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
44% over limit
Discharged 64.7 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
65% over limit
Discharged 0.14340001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
60% over limit
Discharged 48 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 267 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 2901.51397562 kg/d against a permitted limit of 2640.91797781 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
136% over limit
Discharged 106 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Aluminum, total [as Al]
82% over limit
Discharged 0.15850001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
52% over limit
Discharged 48.3 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 61.1 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
9% over limit
Discharged 48.9 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
77% over limit
Discharged 53 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, 5-day, 20 deg. C
81% over limit
Discharged 81.4 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
143% over limit
Discharged 73 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
53% over limit
Discharged 0.13320001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 45.7 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2024
BOD, 5-day, 20 deg. C
43% over limit
Discharged 64.4 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 46.9 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
176337% over limit
Discharged 153.5 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
83% over limit
Discharged 55 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
LC50 Static 48Hr Acute Pimephales promelas
31% over limit
Discharged 69.5 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
3% over limit
Discharged 0.08975 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
E. coli
Limit violation
Discharged 320 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 320 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 267 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)