GROTON -- The Nashua River Watershed Association will launch its 21st season of water monitoring this year. Monitoring will start on the morning of Saturday, April 20, and continue on each third Saturday of the month through October at approximately 43 sites on rivers and streams throughout the watershed. Water samples taken in the field are delivered to labs in Pepperell or Devens for testing by NRWA staff and lab volunteers.

The NRWA will be holding an orientation and training session for those interested in learning more about water monitoring and volunteer opportunities. We will provide training in both collecting samples as well as testing samples at the lab. Interested volunteers may be asked to monitor a new site, join an existing team, assist in testing samples at the Pepperell or Devens lab, or be a back-up for when monitors or lab volunteers are not available. New monitoring sites are considered based on data needs, volunteer availability and funding.

Monitoring for the 2013 season is supported in part by grants from BAE Systems located in Nashua, N.H., and the Norcross Wildlife Foundation Inc.

The volunteer orientation and training session will be held on Thursday, April 4, from 6:30 to 7:30 p.m., at the NRWA Resource Center, 592 Main St. Signup is necessary by March 22. Please contact Kathryn Nelson, NRWA water monitoring coordinator, at