The people of the state of Wisconsin, represented in senate and assembly, do enact as follows:
(a) Except as provided under s. 200.41 (2), upon complaint to the public service commission by any user that charges, rules and practices under this section are unreasonable or unjustly discriminatory, according to the standards and criteria which the commission is required to follow under state or federal law, including, without limitation because of enumeration, this section, 33 USC 1251
et seq. and ch. 283, or upon complaint of a holder of a revenue bond or other evidence of debt, secured by a mortgage on the sewerage system or any part thereof or pledge of the income of sewerage service charges, that charges are inadequate, the public service commission shall investigate the complaint. If sufficient cause therefor appears, the public service commission shall set the matter for a public hearing upon 10 days' notice to the complainant and the commission. After the hearing, if the public service commission determines that the charges, rules or practices complained of are unreasonable or unjustly discriminatory, it shall determine and by order fix reasonable charges, rules and practices and shall make such other order respecting such complaint as may be just and reasonable. The proceedings under this subsection shall be governed, as far as applicable, by ss. 196.26 to 196.40. The commission may submit the factual data, reports and analyses considered by it in establishing the charges, rules or practices subject to a complaint under this subsection. The public service commission shall give due weight to such data, reports and analyses. The public service commission shall make the determination without deference to the commission.
Judicial review of the determination of the public service commission may be had by any person aggrieved in the manner prescribed under ch. 227. If any user pays a charge and the public service commission or court, on appeal from the public service commission, finds such charge, after reviewing a complaint filed under this subsection, to be excessive, the district shall refund to the user the excess plus the interest thereon computed at the rate then paid by the district for borrowing funds for a term of one year or less.