OCSD #1 HARRIMAN STP
NPDES ID: NY0027901
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: 2 effluent violations.
Violations
April 30, 2026
Oxygen demand, ultimate
44% over limit
Discharged 1306.52118902 kg/d against a permitted limit of 907.99999237 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen demand, ultimate
32% over limit
Discharged 52.9 mg/L against a permitted limit of 40 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Copper, total [as Cu]
20% over limit
Discharged 0.5448 kg/d against a permitted limit of 0.454 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved
5% over limit
Discharged 1050 mg/L against a permitted limit of 1000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
197% over limit
Discharged 148.54879875 kg/d against a permitted limit of 49.93999958 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
114% over limit
Discharged 4.7 mg/L against a permitted limit of 2.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
42% over limit
Discharged 8.545 MGD against a permitted limit of 6 MGD (MO AVG)
DMR, Limited - Numeric Violation
Oxygen demand, ultimate
20% over limit
Discharged 48.1 mg/L against a permitted limit of 40 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen demand, ultimate
75% over limit
Discharged 1592.58658662 kg/d against a permitted limit of 907.99999237 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total dissolved
18% over limit
Discharged 1180 mg/L against a permitted limit of 1000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
36% over limit
Discharged 3 mg/L against a permitted limit of 2.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
10% over limit
Discharged 550 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 54.47999954 kg/d against a permitted limit of 49.93999958 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Oxygen demand, ultimate
33% over limit
Discharged 53.1 mg/L against a permitted limit of 40 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
5% over limit
Discharged 2.3 mg/L against a permitted limit of 2.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved
5% over limit
Discharged 1050 mg/L against a permitted limit of 1000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
2% over limit
Discharged 510 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
16% over limit
Discharged 0.0231 mg/L against a permitted limit of 0.02 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
3% over limit
Discharged 1.02 mg/L against a permitted limit of 0.99 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
37% over limit
Discharged 31.00819974 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
87% over limit
Discharged 1.85 mg/L against a permitted limit of 0.99 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
41% over limit
Discharged 1.4 mg/L against a permitted limit of 0.99 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 26.37739978 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
9% over limit
Discharged 246.65819793 kg/d against a permitted limit of 226.99999809 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
19% over limit
Discharged 7.119 MGD against a permitted limit of 6 MGD (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
142% over limit
Discharged 2.4 mg/L against a permitted limit of 0.99 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 57.52179952 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Flow, in conduit or thru treatment plant
23% over limit
Discharged 7.403 MGD against a permitted limit of 6 MGD (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Flow, in conduit or thru treatment plant
5% over limit
Discharged 6.315 MGD against a permitted limit of 6 MGD (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Flow, in conduit or thru treatment plant
1% over limit
Discharged 6.067 MGD against a permitted limit of 6 MGD (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total dissolved
22% over limit
Discharged 1220 mg/L against a permitted limit of 1000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
14% over limit
Discharged 570 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)