DES MOINES, Iowa (AP) — Some of Iowa’s most powerful interest groups along with environmental organizations are backing efforts to clean up the state’s waterways, but there isn’t unity about how to take action on an issue that has frustrated lawmakers in the past.

The proposals present a challenge for the split Iowa Legislature to reach consensus. Two new coalitions have offered very different plans for trying to fix the problem, with one backing an increase in the sales tax and another supporting a moratorium on livestock confinement operation. Gov. Terry Branstad has rejected both of their proposals.

Neither House Republicans nor Senate Democrats, who now control those chambers, have endorsed a specific water quality plan for the next session. Branstad has been clear he doesn’t support raising taxes to pay for water quality initiatives.