NASHUA WASTEWATER TREATMENT FACILITY
NPDES ID: NH0100170
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
This quarter: 1 effluent violation.
Violations
December 31, 2025
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
November 30, 2025
Solids, total suspended
4% over limit
Discharged 47 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
260% over limit
Discharged 180 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
283% over limit
Discharged 1553.1 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
356% over limit
Discharged 13828.38588381 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
8% over limit
Discharged 54 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
17% over limit
Discharged 3553.45797014 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
95% over limit
Discharged 5899.72995043 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
112% over limit
Discharged 106 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
LC50 Static 48Hr Acute Pimephales promelas
25% over limit
Discharged 75 % against a permitted limit of 100 % (DAILY MN)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Ceriodaphnia dubia
25% over limit
Discharged 75 % against a permitted limit of 100 % (DAILY MN)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
2% over limit
Discharged 3104.90597391 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
70% over limit
Discharged 85 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
102% over limit
Discharged 6114.92594862 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
377% over limit
Discharged 1938.5 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
E. coli, thermotol, MF, MTEC
149% over limit
Discharged 1011.7 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
43% over limit
Discharged 4338.87796354 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1000 MPN/100mL (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
1% over limit
Discharged 3069.03997421 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, 20 deg. C
54% over limit
Discharged 77 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
112% over limit
Discharged 6423.64594603 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
97% over limit
Discharged 5959.20394993 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
66% over limit
Discharged 83 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
LC50 Static 48Hr Acute Pimephales promelas
13% over limit
Discharged 86.7 % against a permitted limit of 100 % (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
54% over limit
Discharged 4665.7579608 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
64% over limit
Discharged 82 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 63 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
100% over limit
Discharged 6073.15794897 kg/d against a permitted limit of 3030.90397453 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)