Hop to it, you latent chemists and eco-activists. Saturday, March 15 is the deadline to apply for a grant from the Indiana Department of Natural Resources' Hoosier Riverwatch program, cosponsored by Purdue University. The grant outfits schools, environmental groups, lake associations, scout troops and anybody who cares with a kit that puts water quality monitoring in the hands of the people. A grant covers the cost of chemical testing kits, nets for collecting aquatic critters and a manual. Plus, there's a free workshop for learning the ABCs of water quality monitoring. "The goal of water quality monitoring is to get communities directly involved in water quality issues," said Lyn Hartman, statewide Riverwatch coordinator. "Science classes can use Riverwatch equipment to test streams flowing into rivers, and help identify the sources of pollution." The water's health is revealed by the numbers of macro invertebrates (aka aquatic critters) its sediment contains and sustains. The results of the testing could turn you into the next Erin Brockovich, though the Riverwatch program is all about testing, not about avenging polluters. That comes later. If you can't make the March 15 deadline, you can still come to the free training workshops, or submit a grant for the next round. For more info, see http://www.state.in.us/dnr/soilcons/riverwatch, or call 317-562-1338.