Pool safety

Start with the reason. Per CDC data compiled by the National Drowning Prevention Alliance, there are over 4,500 unintentional drowning deaths a year in the United States, and drowning is the single leading cause of death for children ages 1 to 4. CPSC's barrier booklet notes that nearly 300 children under 5 drown in pools and spas each year, and that children aged 1 to 3 made up 67% of reported pool and spa fatalities.

Supervision alone is not the answer, and the data is blunt about it. Figures cited by NDPA show roughly 70% of toddler drownings happen during non-swim time — nobody was planning to swim — and 88% of children who drown do so with at least one adult present. That is exactly why a physical barrier matters: it works during the lapse.

CPSC's specific recommendations: barrier top at least 48 inches above grade (60 inches is required in some jurisdictions and is generally better); maximum 4 inches of clearance at the bottom, reduced to 2 inches over grass or gravel and 1 inch for removable mesh; vertical member spacing no more than 1¾ inches where horizontal members are less than 45 inches apart, or 4 inches where they are 45 inches or more; chain link mesh no larger than 1¼ inches; and no opening that passes a 4-inch sphere. Gates should open outward, self-close and self-latch, with the latch release at least 3 inches below the top of the gate on the pool side and no opening larger than ½ inch within 18 inches of the release.

If a wall of your house forms part of the barrier, CPSC says doors to the pool should have an alarm sounding for 30 seconds or more within 7 seconds of opening, at least 85 dBA measured 10 feet away, with any deactivation switch at least 54 inches above the threshold — or the pool should have a power safety cover meeting ASTM F1346-91. CPSC also warns against pet doors leading to a pool area. Important caveat: CPSC states plainly that these are guidelines, not a CPSC standard or mandatory requirement. Barrier law is set by state and local code, so check with your building department for what applies to you.

How to choose

Isolation fencing beats perimeter fencing

A fence that separates the pool from the house and the rest of the yard protects against the child who wanders out alone. A yard-perimeter fence with the house as the fourth side does not.

The gate is the weak point

CPSC calls a gate that fails to close and latch the weak link in even the strongest fence. Test the self-closer and latch monthly — springs and hinges wear out.

Layer, do not substitute

Fence, self-latching gate, door alarms, a power safety cover and swim lessons are layers. No single one is childproof, and CPSC says barriers cannot replace adult supervision.

Above-ground pools still need a barrier

CPSC guidance treats the pool wall as a barrier only if the ladder or steps can be secured, locked or removed, and any barrier mounted on top must leave no more than 4 inches of vertical clearance.

Check your code, not just the guidelines

Many states and localities have written barrier rules into building code, sometimes stricter than CPSC's. Ask your building department before you buy fencing.