The American Farm Bureau Federation (AFBF) last week urged its members to resist a proposed rule from the Environmental Protection Agency (EPA) that it says will impose unworkable regulations on the nation’s farms.

Published in the Federal Register, the more-than-111,000-word "Waters of the U.S." proposed rule reflects the EPA’s latest interpretation of the 1972 Clean Water Act.

The rule could ultimately lead to the unlawful...