Weekly Water Sample Results
In accordance with New Hampshire RSA 485-A, Class B waters — which are suitable for fishing, swimming, and other recreational uses — should not exceed an average of 88 E. coli per 100 milliliters of water.
If sample results exceed an average of 158 E. coli per 100 milliliters, the Manchester Health Department may close the area to swimming until water quality improves.
Weekly sampling helps the Health Department monitor water quality at natural bathing locations throughout the city.
Current Sample Results
 |
 |
|
Camp Carpenter
Collection Date
08-25-2025
E. Coli per 100 ml
Lake Right Side: 2
Lake Left Side: <1
|
Crystal Lake -
Melody Pines
Collection Date:
08-25-2025
E. Coli per 100 ml
Lake Right Side: 6
Lake Left Side: 16
|
| |
|
 |
 |
|
Crystal Lake -
Public Beach
Collection Date
08-25-2025
E. Coli per 100 ml
Lake Right Side: 14
Lake Left Side: 26
|
Merrimack River -
Arms Park
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 9
|
| |
|
 |
 |
|
Merrimack River -
Fisher Cat Ramp
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 548
|
Merrimack River -
Chauncy Ave.
Collection Date
08-25-2025
E. Coli per 100 ml
Upstream: 2
Downstream: 20
|
| |
|
 |
 |
|
Merrimack River -
Front Street
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 5
|
Piscataquog River -
Boat Launch/Trestle
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 7
|
| |
|
 |
 |
|
Piscataquog River -
Upland Street
Collection Date
08-25-2025
E. Coli per 100 ml
Lake Right Side: 10
Lake Left Side: 7
|
Piscatoquog River -
Piscataquog River Park
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 48
|
| |
|
 |
 |
|
Pine Island Pond -
Pine Island Park
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 4
|
Piscatoquog River -
Bass Island
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 173
|
| |
|
 |
 |
|
Merrimack River -
Fisher Cat CSO
Collection Date
08-25-2025
E. Coli per 100 ml
Single Sample: 649
|
Merrimack River
Amoskeag Falls Marina
No longer Testing |