Hoosic River Watershed Association’s State of the River Conference will take place from 9:30 a.m. to noon Saturday, Nov. 2, in Fellowship Hall of Williamstown Congregational Church, 906 Main St.

The main focus will be PCBs in the Hoosic.

Williams College chemistry professors David Richardson and Jay Thoman, along with students Amanda Schott and Austin Paul, have analyzed crawfish taken from the Hoosic River and most recently from the Green River and North Branch in Massachusetts.

Richardson, Thoman and Paul will report on their research findings and on other PCB studies dating back to 1991.