TOLEDO, Ohio (AP) — Environmental groups in Ohio and Michigan sued the U.S. Environmental Protection Agency on Tuesday, accusing it of dragging its feet on protecting Lake Erie from harmful algae that have fouled drinking water supplies in recent years. The federal lawsuit said the agency’s lack of action is delaying steps that could combat the algae blooms in the shallowest of the Great Lakes. The sometimes toxic algae are a threat to both drinking water and wildlife and have become more prevalent in recent years. Blooms in the western end of the lake blanket its waters and turn the lake into unsightly shades of green in most summers.