When the Eaton fire raged through neighborhoods in Altadena, the flames leveled three-quarters of the homes served by the tiny Las Flores Water Co. It also destroyed the roofs of two covered reservoirs where the utility stored drinking water. The company soon restored clean water to those homes left standing. But the disaster has left it with costly repairs, and a sharp drop in income since most of its 1,500 customers haven’t yet rebuilt or reconnected their water. Attempting to avert financial failure, the private water company’s board now plans to start charging people a new “fire recovery fee” of about $3,000 over the next five years, or about $50 a month.