This bill establishes new regulations regarding the distribution of water that is exempt from taxation and the use of tax exemption certificates in Iowa. It mandates that water utilities must accept and retain valid exemption certificates, which are documents that exempt all or part of a person's water usage from sales or water service tax. The bill specifies that water utilities cannot require individuals presenting these certificates to seek tax refunds from the Department of Revenue unnecessarily.

Additionally, the bill imposes civil penalties on water utilities that fail to accept valid exemption certificates. Specifically, if a utility does not comply, it must pay a penalty equal to the amount of tax refunded to the individual with the exemption certificate, plus interest. The Department of Revenue is tasked with adopting rules to effectively administer these provisions. Overall, the bill aims to streamline the process for tax-exempt water usage and ensure compliance among water utilities.