Summary: General rate filing and complete tariff update. The revenue impact of this filing, based on a 2019 and partial 2020 test year, will be an annual increase of about $46,000, or 43 percent. The average customer bill would increase $9.62 with a proposed effective date of December 1, 2020. Basin Water Sources, Inc. water system provides service to approximately 385 customers on one water system located near Moses Lake in Grant County. The company’s last rate change became effective on August 1, 2007, for $8,305 (8.5 percent).