Water Quality Monitoring Program: Great Bay Coast Watch

Volunteers measure water temperature, dissolved oxygen, salinity, pH, transparency, fecal coliform and depth for each site and record the results in a database for analysis. Samples are taken at high tide and low tide on the same day.

All sampling activities are subject to rigorous quality control procedures. The Watch began monitoring NH waters for the presence of harmful algal blooms in 1999 Phytoplankton Monitoring Six sites are sampled weekly at high tide and include four along the coast, one in the Great Bay Estuary, and one offshore at the Isles of Shoals.