The development of resorts around Lake Stevens also caused water quality to deteriorate, necessitating the creation of a voluntary drainage district in 1932 to manage runoff and pollution. It was replaced in 1963 by an independent sewer district, which mandated vegetation buffers for homes and later installed a large aeration system to slow the growth of algae in the lake. Frontier Village opened in 1960 and later expanded as State Route 9 and State Route 204 were improved through the area. A new highway bypassing downtown, State Route 92, opened at the end of the decade. The area around Frontier Village was developed into a suburban commuter town in the 1970s and 1980s with the construction of several residential subdivisions. Hewlett-Packard won approval from the county government to build a manufacturing plant northwest of Lake Stevens in 1983, despite opposition from local residents looking to preserve the area's rural character.