California Water Service filed an application with the California Public Utilities Commission on Monday that will result in bill decreases for the utility’s Lucerne customers. The filing implements various ratemaking mechanisms that company officials said will ensure customer bills continue to reflect the true cost to provide water service. For the typical residential Lucerne customer who uses 2,992 gallons, or 4 ccf, of water per month, the monthly bill will decrease by $5.63. Because Lucerne customers are billed for water service every two months, they would see a decrease of $11.26 on the bimonthly bill, the company said.