Section 393.1003 - Rate schedules, procedures to establish or change (St. Louis County)1. Notwithstanding any provisions of chapter 386 and this chapter to the contrary, as of August 28, 2003, a water corporation providing water service in a county with a charter form of government and with more than one million inhabitants may file a petition and proposed rate schedules with the commission to establish or change ISRS rate schedules that will allow for the adjustment of the water corporation's rates and charges to provide for the recovery of costs for eligible infrastructure system replacements made in such county with a charter form of government and with more than one million inhabitants; provided that an ISRS, on an annualized basis, must produce ISRS revenues of at least one million dollars but not in excess of ten percent of the water corporation's base revenue level approved by the commission in the water corporation's most recent general rate proceeding. An ISRS and any future changes thereto shall be calculated and implemented in accordance with the provisions of sections 393.1000 to 393.1006. ISRS revenues shall be subject to refund based upon a finding and order of the commission, to the extent provided in subsections 5 and 8 of section 393.1006.2. The commission shall not approve an ISRS for a water corporation in a county with a charter form of government and with more than one million inhabitants that has not had a general rate proceeding decided or dismissed by issuance of a commission order within the past three years, unless the water corporation has filed for or is the subject of a new general rate proceeding.3. In no event shall a water corporation collect an ISRS for a period exceeding three years unless the water corporation has filed for or is the subject of a new general rate proceeding; provided that the ISRS may be collected until the effective date of new rate schedules established as a result of the new general rate proceeding, or until the subject general rate proceeding is otherwise decided or dismissed by issuance of a commission order without new rates being established.