Long Beach Utilities commissioners met again Thursday to discuss a potential rate hike for water, which could be as high as 10% next year as the department deals with declining sales due to customer conservation, increasing costs and an expanding capital investment plan that could, in the long term, increase the city’s supply of less expensive groundwater.

A staff-recommended hike of 10% for water rates next year would amount to a $5.69 monthly increase for the average customer, according to the department. However, an alternate increase of 9% that was requested at the commission’s last meeting would add about $5.13 to the monthly bill.