Iowa Gov. Terry Branstad is considering a plan to use future cash from an extended statewide sales tax for schools to address Iowa’s water quality issues, The Des Moines Register reported, citing a Branstad aide. The 1 percent sales tax brings in more than $400 million a year for construction at schools, and school property tax relief. Branstad is toying with the idea of asking lawmakers to extend the sales tax past a planned end date, so the state could use some of the future receipts for water quality. Reaction to the idea was lukewarm to mixed. Lawmakers are under pressure to boost spending on conservation projects after the Des Moines Water Works sued three northwest Iowa counties over nitrate pollution.