The Obama administration is expected in the coming days to announce a major clean water regulation that would restore the federal government’s authority to limit pollution in the nation’s rivers, lakes, streams and wetlands. Environmentalists have praised the new rule, calling it an important step that would lead to significantly cleaner natural bodies of water and healthier drinking water. But it has attracted fierce opposition from several business interests, including farmers, property developers, fertilizer and pesticide makers, oil and gas producers and a national association of golf course owners. Opponents contend that the rule would stifle economic growth and intrude...