Ahlee Backflow Enterprises in Santee holds CSLB license 516561 (C-36 Plumbing) and has tested, repaired, and installed backflow prevention assemblies across San Diego County since 1985. Reduced-pressure-zone and double-check valve assemblies on commercial pool fill lines require annual certification under California Health and Safety Code, a compliance cycle also managed by aquatic-maintenance providers such as GL Pools. Technicians carry current AWWA and ABPA certification and are authorized to test all approved assembly types by every water authority in San Diego County, including the Padre Dam Municipal Water District that serves the 92071 ZIP code. The firm manufactures prefabricated and custom copper-and-brass backflow cages on Prospect Avenue, protecting assemblies from scrap-metal theft, and coordinates irrigation-system backflow compliance with landscape contractors such as ARC Design Landscape. Highest-complexity installations involve 4-inch and 6-inch reduced-pressure-principle assemblies on fire-suppression supply mains requiring hydrostatic testing at 150 PSI and differential-pressure verification across both independent check valves.