POWDER MILL FISH HATCHERY
NPDES ID: NH0000710
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 3 effluent violations.
Violations
May 31, 2026
pH
0% over limit
Discharged 6.34 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
12% over limit
Discharged 0.0134 mg/L against a permitted limit of 0.012 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.24 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
March 31, 2026
pH
0% over limit
Discharged 5.98 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2026
pH
0% over limit
Discharged 5.92 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
January 31, 2026
pH
0% over limit
Discharged 5.92 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
pH
0% over limit
Discharged 5.88 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
pH
0% over limit
Discharged 5.92 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2025
pH
0% over limit
Discharged 5.98 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
September 30, 2025
Transparency, secchi disc
0% over limit
Discharged 3.35 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Chlorophyll A
0% over limit
Discharged 0.01418 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.26 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
0% over limit
Discharged 0.0373 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
August 31, 2025
Phosphorus, total [as P]
0% over limit
Discharged 0.05522 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 3.17 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Chlorophyll A
0% over limit
Discharged 0.01421 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.45 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2025
Chlorophyll A
0% over limit
Discharged 0.00698 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.33 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 2.85 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.0347 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
June 30, 2025
Chlorophyll A
0% over limit
Discharged 0.00437 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 3.05 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.01813 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
May 31, 2025
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Chlorophyll A
0% over limit
Discharged 0.00208 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.02 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 3.6 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
April 30, 2025
pH
0% over limit
Discharged 6.31 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
March 31, 2025
pH
0% over limit
Discharged 6.42 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2025
pH
0% over limit
Discharged 5.93 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
January 31, 2025
pH
0% over limit
Discharged 5.95 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
December 31, 2024
pH
0% over limit
Discharged 6.42 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2024
pH
0% over limit
Discharged 6.27 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2024
pH
0% over limit
Discharged 6.25 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
4% over limit
Discharged 0.0125 mg/L against a permitted limit of 0.012 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.45 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Transparency, secchi disc
0% over limit
Discharged 3 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.16 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Chlorophyll A
0% over limit
Discharged 0.012645 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.039575 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
August 31, 2024
Phosphorus, total [as P]
0% over limit
Discharged 0.0499 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 2.475 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
4% over limit
Discharged 0.2928632 kg/d against a permitted limit of 0.28148 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.1 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Chlorophyll A
0% over limit
Discharged 0.033565 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.35 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2024
Phosphorus, total [as P]
0% over limit
Discharged 0.05013 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.18 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Chlorophyll A
0% over limit
Discharged 0.00737 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Transparency, secchi disc
0% over limit
Discharged 2.7 m against a permitted limit of 0 m (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
22% over limit
Discharged 0.3420664 kg/d against a permitted limit of 0.28148 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)