Water Mart Lakeside on Maine Avenue in Lakeside dispenses reverse-osmosis purified and alkaline mineral water through a storefront refill station established in 2024, serving the residential corridors between Woodside Avenue and Los Coches Road. The multi-stage RO filtration system removes dissolved salts, heavy metals, and chlorine before a post-filtration activated-carbon polish, producing water that complements the natural and organic grocery selections at Garden Farms Market on Lakeshore Drive. An exterior window vending machine accepts coins and bills for after-hours refills, giving Lakeside residents access to purified water and bagged ice outside of staffed counter service. Membership pricing structures reduce per-gallon costs for high-volume households, a format tailored to East County's well-water and municipal-supply conditions where total dissolved solids often exceed 500 parts per million. The Maine Avenue location sits in the commercial block between Payton Ace Hardware and the Lindo Lake County Park district, anchoring routine errand loops for downtown Lakeside residents. Alkaline water dispensed at the station targets a pH range between 8.5 and 9.5, achieved through a mineral-injection stage that adds calcium and magnesium ions after the RO membrane strips the source water to near-zero TDS.