Encinitas, Calif. —Olivenhain Municipal Water District is offering a Basics of Backyard Composting and Vermicomposting workshop to the general public to promote water use efficiency. OMWD will hold the free workshop on Tuesday, October 8 from 5:30 p.m. to 7:30 p.m. at Elfin Forest Recreational Reserve’s Interpretive Center Honoring Susan. J. Varty.