Thousands of San Gabriel Valley customers will be receiving refunds from Golden State Water Company after state regulators ruled the San Dimas-based company failed to properly oversee contracts that led to overcharging customers. The CPUC ruled that Golden State must refund Northern California and Southern California customers $9.5 million over the next 3 years and/or lower rates. About $400,000 in refunds will be given to 100,000 Southern California customers, including customers in Charter Oak, Claremont, Covina, Glendora, La Verne, San Dimas, Walnut, San Gabriel, Arcadia, El Monte, Irwindale, Monrovia, Monterey Park, Rosemead and Temple City.