Hello Province Lake Community,

Unfortunately and as previously communicated to you, NH DES did analyze the samples they got and have issued an Advisory for the lake.  We have put the signs up and DES will be back in a week to take new samples.  The official notification is below.



Hi All,

A cyanobacteria warning has been issued at your lake, please see below for details.

WaterbodyProvince Lake, Effingham and Wakefield
Bloom Description (picture attached)Green clouds along shoreline that extend several feet inward. Heavily mixed with yellow pollen. Similar appearance in all four areas that were sampled.
Cyanobacteria TaxaDolichospermum
Cyanobacteria Density (cells/mL)2,550,000
NotesBloom conditions were observed at four different locations along the south shoreline. Cyanobacteria was also observed throughout the lake during sampling performed yesterday with LLMP.

Warnings are issued when cell counts exceed 70,000 cells/mL. NHDES advises lake users to not wade or swim in the water during a warning. Please also keep pets and livestock out. The warning is not based on a toxin evaluation and is intended as a precautionary measure for short term exposure. Please see our newly updated FAQs for more information.

NHDES will resample in a week. I will reach out to you before then for updates. If you have information on where accumulated material is being observed at that time, please let us know to guide our sampling efforts. Warnings remain active until the bloom subsides. You can also see warning details on the Health Swimming Mapper.

To the health officer or other official responsible for posting signs, please post our red cyanobacteria warning signs at all public access points. Please let me know if you do not have any to post or if you need replacements.

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 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