Proposed changes to the federal Clean Water Act have roiled farmers across the nation and created an uproar among many other water users—including cities and counties with parks and recreation areas, golf courses and local water agencies. If adopted, the proposed rule changes would expand the definition of "waters of the United States" to potentially allow federal agencies to regulate virtually every area of ground in the nation that gets wet or has flow during rainfall. California Farm Bureau Federation leaders were in Washington, D.C., in mid-May to explain to lawmakers face to face the damage the proposed changes could...