The city council of Centerville pass a law requiring all new buildings to be outfitted with low-flow toilets instead of regular toilets. The low-flow toilets use approximately 2 less gallons of water per flush. What will be the most likely effect of this new law?
A.
increase in the habitat size for the area's wildlife
B.
decrease in the amount of acid rain falling in the area
C.
pollution of the local groundwater
D.
conservation of local freshwater supplies