DES MOINES, Iowa (AP) — An Iowa agency has approved changes to administrative rules regarding water pollution that two groups say will weaken environmental protections. The Environmental Law & Policy Center and the Iowa Environmental Council say the Iowa Department of Natural Resources scaled back protections to Iowa’s waterways by changing its anti-degradation standards on Wednesday. Those standards help regulate when new pollution is added to Iowa waters. It guides businesses that propose adding or expanding operations.

A DNR commission met and voted to implement changes that guide how to balance the potential costs of a proposed project with its environmental impact. It goes into effect Friday. The environmental groups say the tweak in language eliminates consideration of the environment. Groups supporting the changes disagree. A DNR spokesman says it will clarify the process.