PORT LEYDEN (V) STP
NPDES ID: NY0030341
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
Coliform, fecal general
190% over limit
Discharged 579.4 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
5% over limit
Discharged 84.2 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Coliform, fecal general
45% over limit
Discharged 579.4 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
7% over limit
Discharged 0.08013 MGD against a permitted limit of 0.075 MGD (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Flow, in conduit or thru treatment plant
21% over limit
Discharged 0.091 MGD against a permitted limit of 0.075 MGD (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
30% over limit
Discharged 80.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, suspended percent removal
30% over limit
Discharged 80.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
49% over limit
Discharged 0.112 MGD against a permitted limit of 0.075 MGD (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
132% over limit
Discharged 19.97599983 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
57% over limit
Discharged 19.97599983 kg/d against a permitted limit of 12.71199989 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
15% over limit
Discharged 82.7 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
73% over limit
Discharged 74.1 % against a permitted limit of 85 % (MO AV MN)
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
January 31, 2026
BOD, 5-day, 20 deg. C
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
71% over limit
Discharged 21.79199982 kg/d against a permitted limit of 12.71199989 kg/d (7 DA 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
BOD, 5-day, 20 deg. C
153% over limit
Discharged 21.79199982 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
56% over limit
Discharged 70 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
268% over limit
Discharged 31.77999973 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
150% over limit
Discharged 31.77999973 kg/d against a permitted limit of 12.71199989 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
133% over limit
Discharged 70 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
133% over limit
Discharged 65 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 10.44199991 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
September 30, 2025
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
August 31, 2025
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
45% over limit
Discharged 9.07999992 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
505% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
July 31, 2025
Coliform, fecal general
1110% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 11.3499999 kg/d against a permitted limit of 9.35239992 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
505% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
81% over limit
Discharged 11.3499999 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
7% over limit
Discharged 32 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
153% over limit
Discharged 1011.2 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
55% over limit
Discharged 14.52799988 kg/d against a permitted limit of 9.35239992 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
132% over limit
Discharged 14.52799988 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
406% over limit
Discharged 1011.2 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
May 31, 2025
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
16% over limit
Discharged 7.26399994 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
41% over limit
Discharged 13.16599989 kg/d against a permitted limit of 9.35239992 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
110% over limit
Discharged 13.16599989 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
17% over limit
Discharged 10.89599991 kg/d against a permitted limit of 9.35239992 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
74% over limit
Discharged 10.89599991 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
30% over limit
Discharged 8.17199993 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
16% over limit
Discharged 7.26399994 kg/d against a permitted limit of 6.26519995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)