1. Fees imposed in sections 644.052 and 644.053 shall, except for those fees imposed pursuant to subsection 4 and subsections 6 to 13 of section 644.052, become effective October 1, 1990, and shall expire December 31, 2018. Fees imposed pursuant to subsection 4 and subsections 6 to 13 of section 644.052 shall become effective August 28, 2000, and shall expire on December 31, 2018. The clean water commission shall promulgate rules and regulations on the procedures for billing and collection. All sums received through the payment of fees shall be placed in the state treasury and credited to an appropriate subaccount of the natural resources protection fund created in section 640.220. Moneys in the subaccount shall be expended, upon appropriation, solely for the administration of sections 644.006 to 644.141. Fees collected pursuant to subsection 10 of section 644.052 by a city, a public sewer district, a public water district or other publicly owned treatment works are state fees. Five percent of the fee revenue collected shall be retained by the city, public sewer district, public water district or other publicly owned treatment works as reimbursement of billing and collection expenses.

2. The commission may grant a variance pursuant to section 644.061 to reduce fees collected pursuant to section 644.052 for facilities that adopt systems or technologies that reduce the discharge of water contaminants substantially below the levels required by commission rules.

3. Fees imposed in subsections 2 to 6 of section 644.052 shall be due on the date of application and on each anniversary date of permit issuance thereafter until the permit is terminated.