NH DES performed sampling at the lake on Tuesday, June 18th.

Unfortunately, visible blooms were noted along Bonnyman Road, and sampled concentrations were higher than the state limit … official notice below.

Hi All,

The cyanobacteria warning remains at your lake, please see below for details.

WaterbodyProvince Lake, Effingham and Wakefield
StatusWARNING (ADVISORY) remains
Resampled (most recent sampling date)6/19/2024
Cyanobacteria TaxaDolichospermum
Cyanobacteria Density (cells/mL)4,420,000
NotesThe cyanobacteria density continues to exceed the state limit of 70,000 cell/mL, so the warning will remain active. Four other samples were collected, but not reviewed due to program constraints. Severe bloom conditions were observed along all sample sites on Bonnyman Road. No bloom was observed on the North shoreline along Bailey Road.

Please keep signs posted at public access points. NHDES will arrange for sampling again next week. Warning details can also be found on the Healthy Swimming Mapper. If you click on the warning symbol, you can see our most recent sampling date. When warnings are lifted, the red symbol for the waterbody will no longer be on the map. 

Please forward this email to other residents / community members who need this information. If they would like to be added to the email distribution list, please have them sign up through this form to be directly included on future communications from NHDES. If you prefer to no longer receive these sampling updates, simply respond, and indicate “unsubscribe”.


Kate Hastings and the CyanoHAB Team
Cyanobacteria Harmful Algal Bloom Program
Watershed Management Bureau, Water Division
New Hampshire Department of Environmental Services
29 Hazen Drive, P.O. Box 95, Concord, NH 03302-0095