Hi Folks,
As you can see below, DES came and sampled the lake again on Thursday and no surprise, the warning remains for the lake. You can see the results in the table below. As usual please keep your eyes open and if the water looks bad, stay out. This can change quickly, so you need to be vigilant.
Regards,
The PLA
Hello everyone,
Unfortunately, the cyanobacteria warning at your waterbody REMAINS, please see below for details.
| Waterbody | Province Lake, Effingham/Wakefield |
| Status | WARNING |
| Issued | 8/13/2025 |
| Resampling Date | 8/21/2025 |
| Cyanobacteria Taxa | Dolichospermum |
| Notes | NHDES continued to observe bloom conditions during the resampling event on 8/21. Multiple samples were collected around the waterbody, with the cyanobacteria cell density ranging from 71,800 – 1,920,000 cells/mL. Please report through the Bloom Report Form if you continue to observe bloom conditions and to aid in resampling efforts next week. NHDES is tentatively scheduled to resample on 8/27. |
Please visit the Healthy Swimming Mapper for the most current information about bloom location, status, and severity.
Cyanobacteria reports depict only what an observer sees in the water. The report may reflect a waterbody wide perspective if they boated around the waterbody and made observations, or it could be a single sighting from the shoreline. One sighting does not indicate that a watch or warning is necessary, but it does indicate that those on or around the waterbody should be aware that cyanobacteria have been observed beyond what is natural, and that they should be on the lookout for shifting bloom conditions and report them via theBloom Report Form. Reports will be removed from the Healthy Swimming Mapper after one week if no further reports are received.
Watches are issued when samples are evaluated and cyanobacteria are in higher abundance than normal background levels at multiple locations, but that densities are below 70,000 cells/mL or when clear photographic evidence indicates a bloom is occurring.
Warnings are issued when samples are evaluated microscopically, and cell counts exceed 70,000 cells/mL and the bloom is widespread or extends to multiple locations on the waterbody. A warning does not close the waterbody to recreational use. The warning is intended as a precautionary measure to inform the public of the potential health risks associated with cyanobacteria blooms. Please see our updated FAQs for more information.
NHDES advises lake users to not swim in or near the vicinity of where bloom material is visible. Please also keep pets and livestock out of areas where bloom material is observed. It is suggested that local authorities post the 2025 cyanobacteria sign at public access points while a warning is in place to alert the public of current conditions.
Please forward this email to other residents / community members who may benefit from 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”.
Best,
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
603-848-8094 hab@des.nh.gov
