CHEMUNG CO SD#1 STP
NPDES ID: NY0036986
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: 8 effluent violations.
Violations
May 31, 2026
Carbonaceous oxygen demand, % removal
6% over limit
Discharged 68.27 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
79% over limit
Discharged 55.25 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
21% over limit
Discharged 27.54228507 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
April 30, 2026
Total phenols
180% over limit
Discharged 0.77552279 kg/d against a permitted limit of 0.27694 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Antimony, total [as Sb]
107% over limit
Discharged 0.94168679 kg/d against a permitted limit of 0.454 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
82% over limit
Discharged 54.53 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
21% over limit
Discharged 27.52378427 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
Carbonaceous oxygen demand, % removal
28% over limit
Discharged 61.57 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2026
Carbonaceous oxygen demand, % removal
27% over limit
Discharged 61.99 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
4% over limit
Discharged 1.04 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
40% over limit
Discharged 64.94 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
5% over limit
Discharged 5.71 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
18% over limit
Discharged 26.73562787 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
9% over limit
Discharged 43.77 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
135% over limit
Discharged 58.76 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
16% over limit
Discharged 34.67 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
169% over limit
Discharged 107.59 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Carbonaceous oxygen demand, % removal
11% over limit
Discharged 66.79 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
12% over limit
Discharged 25.49430105 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
20% over limit
Discharged 69.89 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
59% over limit
Discharged 1.59 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
389% over limit
Discharged 0.91072399 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Carbonaceous oxygen demand, % removal
43% over limit
Discharged 57.18 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
13% over limit
Discharged 2107.98554229 kg/d against a permitted limit of 1861.39998436 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
58% over limit
Discharged 47.37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
75% over limit
Discharged 56.15 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
384% over limit
Discharged 0.90041819 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
9% over limit
Discharged 24.79872305 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
254% over limit
Discharged 88.55 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
25% over limit
Discharged 1423.86656804 kg/d against a permitted limit of 1134.99999046 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
230% over limit
Discharged 132.15 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
54% over limit
Discharged 1.54 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Phosphorus, total [as P]
4% over limit
Discharged 23.51077223 kg/d against a permitted limit of 22.69200023 kg/d (12MO TOT)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 73.35 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
90% over limit
Discharged 47.39 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 33.02 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
595% over limit
Discharged 1.29340059 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
49% over limit
Discharged 1.49 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
96% over limit
Discharged 78.45 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Phosphorus, total [as P]
46% over limit
Discharged 1.46 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Phosphorus, total [as P]
60% over limit
Discharged 1.6 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Total phenols
26% over limit
Discharged 0.3497616 kg/d against a permitted limit of 0.27694 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
99% over limit
Discharged 0.3712358 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, carbonaceous [5 day, 20 C]
16% over limit
Discharged 46.28 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
110% over limit
Discharged 2.1 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
4% over limit
Discharged 26.02 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
55% over limit
Discharged 1.55 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 43.94 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 30.28 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Phosphorus, total [as P]
39% over limit
Discharged 1.39 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
7% over limit
Discharged 48.27 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
70% over limit
Discharged 57.55 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 30.61 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
261% over limit
Discharged 0.67196539 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
11% over limit
Discharged 1.11 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, suspended percent removal
48% over limit
Discharged 63.05 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Total phenols
26% over limit
Discharged 0.3498524 kg/d against a permitted limit of 0.27694 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
43% over limit
Discharged 35.72 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
34% over limit
Discharged 2500.22337899 kg/d against a permitted limit of 1861.39998436 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
59% over limit
Discharged 63.49 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Carbonaceous oxygen demand, % removal
16% over limit
Discharged 65.16 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
7% over limit
Discharged 1219.52570975 kg/d against a permitted limit of 1134.99999046 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, carbonaceous [5 day, 20 C]
227% over limit
Discharged 81.74 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
39% over limit
Discharged 1581.49082671 kg/d against a permitted limit of 1134.99999046 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Carbonaceous oxygen demand, % removal
29% over limit
Discharged 61.43 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
10% over limit
Discharged 1.1 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 39.67 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Total phenols
52% over limit
Discharged 0.4213574 kg/d against a permitted limit of 0.27694 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
391% over limit
Discharged 0.91399279 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 48.17 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
176% over limit
Discharged 110.29 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
16% over limit
Discharged 2164.31786181 kg/d against a permitted limit of 1861.39998436 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 66.79 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2025
Carbonaceous oxygen demand, % removal
41% over limit
Discharged 57.6 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
266% over limit
Discharged 146.32 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
319% over limit
Discharged 0.77938179 kg/d against a permitted limit of 0.18614 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
24% over limit
Discharged 37.33 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
64% over limit
Discharged 3043.52971443 kg/d against a permitted limit of 1861.39998436 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
110% over limit
Discharged 2384.61227996 kg/d against a permitted limit of 1134.99999046 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 56.73 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
12% over limit
Discharged 1.12 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
13% over limit
Discharged 71.72 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
393% over limit
Discharged 123.25 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Carbonaceous oxygen demand, % removal
28% over limit
Discharged 61.65 % against a permitted limit of 70 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
227% over limit
Discharged 130.6 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
9% over limit
Discharged 72.65 % against a permitted limit of 75 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
34% over limit
Discharged 1.34 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 40.89 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 56.73 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
3% over limit
Discharged 1924.64672383 kg/d against a permitted limit of 1861.39998436 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
273% over limit
Discharged 93.22 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, carbonaceous [5 day, 20 C]
165% over limit
Discharged 106.08 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
77% over limit
Discharged 44.32 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Phosphorus, total [as P]
1% over limit
Discharged 1.01 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Phosphorus, total [as P]
6% over limit
Discharged 1.06 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, carbonaceous [5 day, 20 C]
11% over limit
Discharged 44.34 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)