GLOUCESTER W P C F
NPDES ID: MA0100625
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: 9 effluent violations.
Violations
May 31, 2026
Hydrocarbons, petroleum
241% over limit
Discharged 17 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
303% over limit
Discharged 1610 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Oil & Grease
12% over limit
Discharged 28 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Hydrocarbons, petroleum
100% over limit
Discharged 10 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
463% over limit
Discharged 2250 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Hydrocarbons, petroleum
80% over limit
Discharged 9 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
53% over limit
Discharged 46.7 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.4 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
13% over limit
Discharged 86.8 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2026
Oil & Grease
16% over limit
Discharged 29 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
20% over limit
Discharged 6 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Hydrocarbons, petroleum
321% over limit
Discharged 21 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil & Grease
20% over limit
Discharged 30 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
65% over limit
Discharged 34.9 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Oil & Grease
76% over limit
Discharged 44 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
73% over limit
Discharged 27.2 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
120% over limit
Discharged 11 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
188% over limit
Discharged 1150 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Oil & Grease
96% over limit
Discharged 49 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
20% over limit
Discharged 6 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
38% over limit
Discharged 550 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Oil & Grease
92% over limit
Discharged 48 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
100% over limit
Discharged 10 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
38% over limit
Discharged 62.3 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
5% over limit
Discharged 384 mg/L against a permitted limit of 367 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
481% over limit
Discharged 29 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
650% over limit
Discharged 3000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Oil & Grease
200% over limit
Discharged 75 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
7% over limit
Discharged 261 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
66% over limit
Discharged 34.2 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2025
Coliform, fecal general
650% over limit
Discharged 3000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 368 mg/L against a permitted limit of 367 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
341% over limit
Discharged 22 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
10% over limit
Discharged 0.53 mg/L against a permitted limit of 0.48 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 276 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oil & Grease
28% over limit
Discharged 32 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Chlorine, total residual
19% over limit
Discharged 0.57 mg/L against a permitted limit of 0.48 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
420% over limit
Discharged 2080 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
201% over limit
Discharged 15 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil & Grease
68% over limit
Discharged 42 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Hydrocarbons, petroleum
40% over limit
Discharged 7 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
71% over limit
Discharged 29.5 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
15% over limit
Discharged 84.8 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
May 31, 2025
Coliform, fecal general
13% over limit
Discharged 450 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.4 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2025
Hydrocarbons, petroleum
60% over limit
Discharged 8 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
LC50 Static 48Hr Acute Menidia
68% over limit
Discharged 32.4 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
100% over limit
Discharged 10 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
36% over limit
Discharged 63.6 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2025
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Coliform, fecal general
110% over limit
Discharged 840 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
60% over limit
Discharged 8 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Hydrocarbons, petroleum
161% over limit
Discharged 13 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Hydrocarbons, petroleum
120% over limit
Discharged 11 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
65% over limit
Discharged 34.9 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Coliform, fecal general
650% over limit
Discharged 3000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
82% over limit
Discharged 18.4 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, 20 deg. C
20% over limit
Discharged 295 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 3000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
80% over limit
Discharged 9 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
29% over limit
Discharged 270 mg/L against a permitted limit of 210 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 304 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
6% over limit
Discharged 0.51 mg/L against a permitted limit of 0.48 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
17% over limit
Discharged 428 mg/L against a permitted limit of 367 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
201% over limit
Discharged 15 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil & Grease
16% over limit
Discharged 29 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Coliform, fecal general
Limit violation
Discharged 39 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 3000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 416 mg/L against a permitted limit of 367 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Hydrocarbons, petroleum
301% over limit
Discharged 20 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
17% over limit
Discharged 0.56 mg/L against a permitted limit of 0.48 mg/L (MO AVG)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Menidia
74% over limit
Discharged 26.4 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 304 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oil & Grease
12% over limit
Discharged 28 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
17% over limit
Discharged 82.9 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2024
Hydrocarbons, petroleum
120% over limit
Discharged 11 mg/L against a permitted limit of 4.99 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 600 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 25 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
1% over limit
Discharged 248 mg/L against a permitted limit of 245 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)