Amends the Public Utilities Act. Provides that in the case of a public utility that provides drinking water services, upon the request of a municipal wastewater agency or unit of local government organized under specified Acts, such public utility shall provide timely and accurate water usage data, in a format identifiable to the requester, for purposes of calculating wastewater billings. Provides that the public utility shall be entitled to collect its reasonable costs incurred to provide such data.