I would look at modifying the definition of "Maintenance" to eliminate the replacement of pumps/motors. This jurisdiction has had contractors and newly licensed operators replace pumps for drip irrigation and Low Pressure Distribution systems, which are now being dosed in excess of the design flow, exceeding 10% flow variation, or do not meet the designed gallons/day. Any AOSS  that has a pump replaced without permitting/inspections can potentially have greater consequenses should this definition remain as written.