NEWPORT WASTEWATER TREATMENT FACILITY
NPDES ID: NH0100200
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 1 effluent violation, 1 single-event violation.
Violations
April 30, 2026
E. coli, thermotol, MF, MTEC
39% over limit
Discharged 563.5 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Copper, total recoverable
40% over limit
Discharged 0.024 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Pimephales promelas
27% over limit
Discharged 72.97 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
7% over limit
Discharged 28 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
39% over limit
Discharged 0.0183 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
19% over limit
Discharged 31 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
86% over limit
Discharged 0.032 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
105% over limit
Discharged 0.027 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total recoverable
58% over limit
Discharged 0.0208 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
28% over limit
Discharged 0.022 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 31.5 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
11% over limit
Discharged 4 mg/L against a permitted limit of 3.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total recoverable
44% over limit
Discharged 0.019 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
11% over limit
Discharged 4 mg/L against a permitted limit of 3.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
22% over limit
Discharged 0.021 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
7% over limit
Discharged 28 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Phosphorus, total [as P]
22% over limit
Discharged 4.4 mg/L against a permitted limit of 3.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
22% over limit
Discharged 0.10600001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
11% over limit
Discharged 0.0147 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Aluminum, total recoverable
95% over limit
Discharged 0.17000001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Aluminum, total recoverable
32% over limit
Discharged 0.11500001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
30% over limit
Discharged 39 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
16% over limit
Discharged 58 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
27% over limit
Discharged 81 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
29% over limit
Discharged 58 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Aluminum, total recoverable
24% over limit
Discharged 0.10800001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
9% over limit
Discharged 49 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Aluminum, total recoverable
28% over limit
Discharged 0.11100001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
LC50 Static 48Hr Acute Pimephales promelas
31% over limit
Discharged 68.6 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
LC50 Static 48Hr Acute Ceriodaphnia dubia
29% over limit
Discharged 70.71 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
25% over limit
Discharged 32.5 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
14% over limit
Discharged 0.015 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
35% over limit
Discharged 35.3 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
28% over limit
Discharged 0.022 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
2% over limit
Discharged 0.0135 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
30% over limit
Discharged 34 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
LC50 Static 48Hr Acute Pimephales promelas
32% over limit
Discharged 68.5 % against a permitted limit of 100 % (MO AV MN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
22% over limit
Discharged 4.4 mg/L against a permitted limit of 3.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
25% over limit
Discharged 0.0165 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
38% over limit
Discharged 36 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
45% over limit
Discharged 0.025 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli, thermotol, MF, MTEC
496% over limit
Discharged 2420 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
39% over limit
Discharged 5 mg/L against a permitted limit of 3.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
1108% over limit
Discharged 1522 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
7% over limit
Discharged 28 mg/L against a permitted limit of 26.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
6% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0132 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Lead, total recoverable
9% over limit
Discharged 0.0025 mg/L against a permitted limit of 0.0023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
107% over limit
Discharged 0.18000001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Lead, total recoverable
4% over limit
Discharged 0.0024 mg/L against a permitted limit of 0.0023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
110% over limit
Discharged 0.18300001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Aluminum, total recoverable
44% over limit
Discharged 0.12500001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Copper, total recoverable
22% over limit
Discharged 0.021 mg/L against a permitted limit of 0.0172 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
46% over limit
Discharged 0.12700001 mg/L against a permitted limit of 0.087 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)