Drain entrapment and suction safety
At a glance: San Diego County requires compliant drain covers, a vacuum relief system and at least two suction outlets 3 feet apart on new pools, and California requires an anti-entrapment cover upgrade whenever a home with a pool is remodelled under permit[1][2].
What is drain entrapment?
Entrapment happens when the suction of a pool or spa outlet holds a swimmer against it, or catches hair, limbs, jewellery or swimwear. The hazard is greatest with a single drain, a broken or missing drain cover, or a pump that can pull a strong vacuum through one opening. Modern rules aim to make sure no single outlet can trap a person.
What do San Diego County rules require?
County form PDS-379 lists four entrapment requirements for pools and spas in unincorporated areas[1]:
- Every suction outlet except surface skimmers must have a cover that meets ASME A112.19.8M, a drain grate of 12 by 12 inches or larger, or an approved channel drain.
- Every circulation system must have atmospheric vacuum relief in case a grate goes missing or breaks: a safety vacuum release system (SVRS) meeting ASME A112.19.17, or an approved gravity drainage system.
- Systems must have at least two suction outlets at least 3 feet apart, piped so water is drawn through both at once through a vacuum-relief-protected line.
- Vacuum or pressure cleaner fittings must sit 6 to 12 inches below the minimum water level, or be part of the skimmer.
The County also requires suction outlets to be designed to circulate water throughout the pool, and all entrapment measures to be inspected and approved before plastering or filling.
What does state law say about existing pools?
California law requires an anti-entrapment cover whenever a pool is built, and whenever a building permit is issued to remodel or modify a single-family home that has an existing pool, toddler pool or spa, the permit must require the suction outlet to be upgraded to an anti-entrapment cover meeting current ASTM or ASME standards[2]. The City of San Diego applies the same rule to permits for remodelling an existing pool or spa[3].
Is there a federal law?
Yes. The Virginia Graeme Baker Pool and Spa Safety Act is the federal law on pool and spa drain safety, administered by the U.S. Consumer Product Safety Commission[4]. It is named after a girl who died after being trapped by the suction of a spa drain. The CPSC page is the place to start for the federal requirements and for which pools they cover.
What should pool owners check?
- Drain covers are in place, not cracked, and marked with the standard they meet and a service life
- Every suction outlet is part of a dual-drain or vacuum-relief system
- The pump cannot run with a missing cover; if it does, shut the pool until it is fixed
- Spa users, especially children, keep hair and loose clothing away from outlets
- Any remodel permit includes the required outlet upgrade
San Diego Pools’ service page points owners of its pools to a service request form for equipment problems[5].
How do builders design for it?
Most new residential pools use at least two main drains piped together so that blocking one does not create a dangerous vacuum, plus skimmers. Larger channel drains and grates spread the flow so the suction at any point is low. A variable-speed pump can also be programmed to run at lower flow for routine filtration. Equipment choices are covered in equipment and energy rules.
Questions readers ask
Do new pools in San Diego County need two drains?
Under County form PDS-379, circulation systems need at least two suction outlets at least 3 feet apart, or another approved arrangement.
What is an SVRS?
A safety vacuum release system, which detects a blocked suction line and releases the vacuum. The County cites ASME A112.19.17.
Does remodelling my house affect my pool?
Yes. A permit to remodel a single-family home with an existing pool must require an anti-entrapment drain cover upgrade.
Related articles
Notes and sources
- ^ a b PDS-379: Swimming Pool and Spa Safety Requirements. County of San Diego Planning & Development Services. Retrieved 9 November 2026.
- ^ a b Special Considerations for Swimming Pool Construction. Contractors State License Board. Retrieved 9 November 2026.
- ^ Information Bulletin 712: Swimming Pools and Spas (June 2021). City of San Diego Development Services Department. Retrieved 9 November 2026.
- ^ Pool and Spa Safety Act. U.S. Consumer Product Safety Commission. Retrieved 9 November 2026.
- ^ Services (EasyTouch quick reference and service request). San Diego Pools (sandiegopools.com). Retrieved 9 November 2026.