Middleton, NH

NHDES Beach Advisory

August 14, 2025

Bloom conditions were first observed on 8/8 and sightings have continued throughout the week. NHDES staff observed bloom conditions and collected samples from Sunrise Lake on 8/12 that had cyanobacteria present at a density that exceeded the recreational threshold.

Please report through the Bloom Report Form if you continue to see bloom conditions.

Note that this does not mean the entire lake has a cyanobacterial bloom, only reported bloom sites.  Lake users should remain vigilant and report any blooms to the NHDES.

Please visit the Healthy Swimming Mapper for the most current information about bloom location, status, and severity

NHDES Beach Advisory Issued: 8/13/2025 Location: Sunrise Lake, Middleton A cyanobacteria bloom has been reported at Sunrise Lake in Middleton. Samples collected on August 12th showed a cyanobacteria density of 490,000 cells/mL, exceeding the recreational threshold. What to know: The species identified is Dolichospermum. Bloom conditions were first observed on August 8th and have continued throughout the week. This report applies to the specific reported bloom sites, not necessarily the entire lake. What to do: Avoid contact with the water in areas with visible blooms. Keep pets out of the water where blooms are present. If you see a bloom, please report it to NHDES through the Bloom Report Form. Stay informed by checking the NHDES Healthy Swimming Mapper for the most current information.

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