The EPA set the limits Monday after it settled a lawsuit with environmental groups last year. The numeric limits on runoff are designed to reduce pollution from sewage treatment plants and runoff choking lakes, rivers and other Florida waters with algae blooms.
Agriculture, business interests and some politicians, including Gov.-elect Rick Scott, say that meeting the new standards will be too costly.
EPA officials say critics' cost estimates are wildly exaggerated. The EPA puts the cost at $130 million to $200 million a year, not the billions claimed by opponents.