WESTMORELAND STP
NPDES ID: TN0055026
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: 3 effluent violations.
Violations
May 31, 2026
Oxygen, dissolved [DO]
3% over limit
Discharged 5.8 mg/L against a permitted limit of 6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
117% over limit
Discharged 19.6146922 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, total [as N]
135% over limit
Discharged 21.23500021 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, total [as N]
157% over limit
Discharged 23.25248023 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Phosphorus, total [as P]
54% over limit
Discharged 1.74344002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
58% over limit
Discharged 14.33068014 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, total [as N]
64% over limit
Discharged 14.86760015 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, total [as N]
17% over limit
Discharged 10.5548801 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
50% over limit
Discharged 1.69632002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
November 30, 2025
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
8% over limit
Discharged 9.7736801 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
20% over limit
Discharged 1.36152001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, total [as N]
4% over limit
Discharged 9.45500009 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
30% over limit
Discharged 1.47560001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, total [as N]
8% over limit
Discharged 9.7736801 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 0.87 mg/L against a permitted limit of 0.75 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
75% over limit
Discharged 1.75 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
20% over limit
Discharged 1.36028001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 1.11 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
8% over limit
Discharged 9.7377201 kg/d against a permitted limit of 9.05200009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
31% over limit
Discharged 1.47808001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Phosphorus, total [as P]
30% over limit
Discharged 1.47188001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Phosphorus, total [as P]
53% over limit
Discharged 1.73600002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
29% over limit
Discharged 1.29 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1005% over limit
Discharged 9.53399992 kg/d against a permitted limit of 0.86259999 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Phosphorus, total [as P]
11% over limit
Discharged 1.25984001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Phosphorus, total [as P]
28% over limit
Discharged 1.44460001 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Phosphorus, total [as P]
47% over limit
Discharged 1.66160002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
December 31, 2024
SSO, Dry Weather
Limit violation
Discharged 0.0329 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
55% over limit
Discharged 1.75584002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Phosphorus, total [as P]
56% over limit
Discharged 1.76700002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Phosphorus, total [as P]
62% over limit
Discharged 1.83148002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 1.4 mg/L against a permitted limit of 1.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
62% over limit
Discharged 2.43 mg/L against a permitted limit of 1.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
31% over limit
Discharged 1.97 mg/L against a permitted limit of 1.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
69% over limit
Discharged 1.91456002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Phosphorus, total [as P]
73% over limit
Discharged 1.95920002 kg/d against a permitted limit of 1.13212001 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)