Swimming pools should always be happy places. Unfortunately, each year thousands of American families confront swimming pool tragedies, drownings and near-drownings of young children. At InterNACHI, we want to prevent these tragedies. These are guidelines for pool barriers that can help prevent most submersion incidents involving young children. These guidelines are not intended as the sole method to minimize pool drowning of young children, but include helpful safety tips for safer pools.

Each year, hundreds of young children die and thousands come close to death due to submersion in residential swimming pools. The Consumer Product Safety Commission (CPSC) has estimated that each year, about 300 children under the age of 5 drown in swimming pools. Hospital emergency-room treatment is required for more than 2,000 children under 5 who were submerged in residential pools. The CPSC did an extensive study of swimming pool accidents, both fatal drownings and near-fatal submersions, in California, Arizona and Florida — states in which home swimming pools are very popular and used during much of the year.

• In California, Arizona and Florida, drowning was the leading cause of accidental death in and around the home for children under the age of 5.
• Seventy-five percent of the children involved in swimming pool submersion or drowning accidents were between 1 and 3 years old. 
• Boys between 1 and 3 were the most likely victims of fatal drownings and near-fatal submersions in residential swimming pools. 
• Most of the victims were in the presence of one or both parents when the swimming pool accident occurred. 
• Nearly half of the child victims were last seen in the house before the pool accident occurred. In addition, 23% of the accident victims were last seen on the porch or patio, or in the yard. 
• This means that 69% of the children who became victims in swimming pool accidents were not expected to be in or at the pool, but were found drowned or submerged in the water. 
• Sixty-five percent of the accidents occurred in a pool owned by the victim’s immediate family, and 33% of the accidents occurred in pools owned by relatives or friends. 
• Fewer than 2% of the pool accidents were the result of children trespassing on property where they didn’t live or belong. 
• Seventy-seven percent of the swimming pool accident victims had been missing for five minutes or less when they were found in the pool, drowned or submerged. 
  

The speed with which swimming pool drownings and submersions can occur is a special concern: by the time a child’s absence is noted, the child may have drowned. Anyone who has cared for a toddler knows how fast young children can move. Toddlers are inquisitive and impulsive, and lack a realistic sense of danger. These behaviors, coupled with a child’s ability to move quickly and unpredictably, make swimming pools particularly hazardous for households with young children.
 Swimming pool drownings of young children have another particularly insidious feature: these are silent deaths. It is unlikely that splashing or screaming will occur to alert a parent or caregiver that a child is in trouble. The best way to reduce child drownings in residential pools is for pool owners to construct and maintain barriers that prevent young children from gaining access to pools. However, there are no substitutes for diligent supervision.Why the Swimming Pool Guidelines Were Developed Young child can get over a pool barrier if the barrier is too low, or if the barrier has handholds or footholds for a child to use for climbing. The guidelines recommend that the top of a pool barrier be at least 48 inches above grade, measured on the side of the barrier which faces away from the swimming pool. Eliminating handholds and footholds, and minimizing the size of openings in a barrier’s construction, can prevent inquisitive children from climbing pool barriers. For a solid barrier, no indentations or protrusions should be present, other than normal construction tolerances and masonry joints. For a barrier (fence) made up of horizontal and vertical members, if the distance between the tops of the horizontal members is less than 45 inches, the horizontal members should be on the swimming pool-side of the fence. The spacing of the vertical members should not exceed 1-3/4 inches. This size is based on the foot-width of a young child, and is intended to reduce the potential for a child to gain a foothold. If there are any decorative cutouts in the fence, the space within the cutouts should not exceed 1-3/4 inches. The definition of pool includes spas and hot tubs. The swimming pool-barrier guidelines, therefore, apply to these structures, as well as to conventional swimming pools. How to Prevent a Child from Getting OVER a Pool Barrier A successful pool barrier prevents a child from getting OVER, UNDER or THROUGH, and keeps the child from gaining access to the pool except when supervising adults are present.The Swimming Pool-Barrier Guidelines If the distance between the tops of the horizontal members is more than 45 inches, the horizontal members can be on the side of the fence facing away from the pool. The spacing between vertical members should not exceed 4 inches. This size is based on the head-breadth and chest depth of a young child, and is intended to prevent a child from passing through an opening. Again, if there are any decorative cutouts in the fence, the space within the cutouts should not exceed 1-3/4 inches.

For a chain-link fence, the mesh size should not exceed 1-1/4 inches square, unless slats fastened at the top or bottom of the fence are used to reduce mesh openings to no more than 1-3/4 inches.For a fence made up of diagonal members (lattice work), the maximum opening in the lattice should not exceed 1-3/4 inches. Above-ground pools should have barriers. The pool structure itself can sometimes serves as a barrier, or a barrier can be mounted on top of the pool structure. Then, there are two possible ways to prevent young children from climbing up into an above-ground pool. The steps or ladder can be designed to be secured, locked or removed to prevent access, or the steps or ladder can be surrounded by a barrier, such as those described above. For any pool barrier, the maximum clearance at the bottom of the barrier should not exceed 4 inches above grade, when the measurement is done on the side of the barrier facing away from the pool. 

If an above-ground pool has a barrier on the top of the pool, the maximum vertical clearance between the top of the pool and the bottom of the barrier should not exceed 4 inches. Preventing a child from getting through a pool barrier can be done by restricting the sizes of openings in a barrier, and by using self-closing and self-latching gates.To prevent a young child from getting through a fence or other barrier, all openings should be small enough so that a 4-inch diameter sphere cannot pass through. This size is based on the head- breadth and chest-depth of a young child.Gates

There are two kinds of gates which might be found on a residential property. Both can play a part in the design of a swimming pool barrier. Pedestrian gates are the gates people walk through. Swimming pool barriers should be equipped with a gate or gates which restrict access to the pool. A locking device should be included in the gate’s design. Gates should open out from the pool and should be self-closing and self-latching. If a gate is properly designed, even if the gate is not completely latched, a young child pushing on the gate in order to enter the pool area will at least close the gate and may actually engage the latch. When the release mechanism of the self-latching device is less than 54 inches from the bottom of the gate, the release mechanism for the gate should be at least 3 inches below the top of the gate on the side facing the pool. Placing the release mechanism at this height prevents a young child from reaching over the top of a gate and releasing the latch. Also, the gate and barrier should have no opening greater than 1/2-inch within 18 inches of the latch release mechanism. This prevents a young child from reaching through the gate and releasing the latch.  Other gates should be equipped with self-latching devices. The self-latching devices should be installed as described for pedestrian gates.How to Prevent a Child from Getting UNDER or THROUGH a Pool Barrier In many homes, doors open directly onto the pool area or onto a patio which leads to the pool. In such cases, the wall of the house is an important part of the pool barrier, and passage through any doors in the house wall should be controlled by security measures. The importance of controlling a young child’s movement from the house to the pool is demonstrated by the statistics obtained during the CPSC’s study of pool incidents in California, Arizona and Florida. Almost half (46%) of the children who became victims of pool accidents were last seen in the house just before they were found in the pool.All doors which give access to a swimming pool should be equipped with an audible alarm which sounds when the door and/or screen are opened. The alarm should sound for 30 seconds or more within seven seconds after the door is opened.  It should also be loud, at least 85 decibels, when measured 10 feet away from the alarm mechanism. The alarm sound should be distinct from other sounds in the house, such as the telephone, doorbell and smoke alarm. The alarm should have an automatic re-set feature. Because adults will want to pass through house doors in the pool barrier without setting off the alarm, the alarm should have a switch that allows adults to temporarily de-activate the alarm for up to 15 seconds. The de-activation switch could be a touch pad (keypad) or a manual switch, and should be located at least 54 inches above the threshold of the door covered by the alarm. This height was selected based on the reaching ability of young children.Power safety covers can be installed on pools to serve as security barriers. Power safety covers should conform to the specifications in ASTM F 1346-91. This standard specifies safety performance requirements for pool covers to protect young children from drowning. Self-closing doors with self-latching devices could also be used to safeguard doors which give ready access to a swimming pool. Indoor Pools When a pool is located completely within a house, the walls that surround the pool should be equipped to serve as pool safety barriers. Measures recommended above where a house wall serves as part of a safety barrier also apply for all the walls surrounding an indoor pool.  GuidelinesAn outdoor swimming pool, including an in-ground, above-ground, or on-ground pool, hot tub, or spa, should be provided with a barrier which complies with the following: 1. The top of the barrier should be at least 48 inches above grade, measured on the side of the barrier which faces away from the swimming pool. The maximum vertical clearance between grade and the bottom of the barrier should be 4 inches measured on the side of the barrier which faces away from the swimming pool. Where the top of the pool structure is above grade, such as an above-ground pool, the barrier may be at ground level, such as the pool structure, or mounted on top of the pool structure. Where the barrier is mounted on top of the pool structure, the maximum vertical clearance between the top of the pool structure and the bottom of the barrier should be 4 inches.
 2. Openings in the barrier should not allow passage of a 4-inch diameter sphere. 3. Solid barriers, which do not have openings, such as a masonry and stone wall, should not contain indentations or protrusions, except for normal construction tolerances and tooled masonry joints.
 4. Where the barrier is composed of horizontal and vertical members, and the distance between the tops of the horizontal members is less than 45 inches, the horizontal members should be located on the swimming pool-side of the fence. Spacing between vertical members should not exceed 1-3/4 inches in width. Where there are decorative cutouts, spacing within the cutouts should not exceed 1-3/4 inches in width. 5. Where the barrier is composed of horizontal and vertical members, and the distance between the tops of the horizontal members is 45 inches or more, spacing between vertical members should not exceed 4 inches. Where there are decorative cutouts, spacing within the cutouts should not exceed 1-3/4 inches in width.
 6. The maximum mesh size for chain-link fences should not exceed 1-3/4 inch square, unless the fence is provided with slats fastened at the top or the bottom which reduce the openings to no more than 1-3/4 inches. 7. Where the barrier is composed of diagonal members, such as a lattice fence, the maximum opening formed by the diagonal members should be no more than 1-3/4 inches.  8. Access gates to the pool should be equipped to accommodate a locking device. Pedestrian access gates should open outward, away from the pool, and should be self-closing and have a self-latching device. Gates other than pedestrian access gates should have a self-latching device, where the release mechanism of the self-latching device is located less than 54 inches from the bottom of the gate.

• The release mechanism should be located on the pool-side of the gate at least 3 inches below the top of the gate.
• The gate and barrier should have no opening greater than 1/2-inch within 18 inches of the release mechanism.

9. Where a wall of a dwelling serves as part of the barrier, one of the following should apply:

• All doors with direct access to the pool through that wall should be equipped with an alarm which produces an audible warning when the door and its screen, if present, are opened. The alarm should sound continuously for a minimum of 30 seconds within seven seconds after the door is opened. The alarm should have a minimum sound pressure rating of 85 dBA at 10 feet, and the sound of the alarm should be distinctive from other household sounds, such as smoke alarms, telephones and doorbells. The alarm should automatically re-set under all conditions. The alarm should be equipped with manual means, such as touchpads or switches, to temporarily de-activate the alarm for a single opening of the door from either direction. Such de-activation should last for no more than 15 seconds. The de-activation touch pads or switches should be located at least 54 inches above the threshold of the door.
• The pool should be equipped with a power safety cover which complies with ASTM F1346-91. 
• Other means of protection, such as self-closing doors with self-latching devices, are acceptable as long as the degree of protection afforded is not less than the protection afforded by the above.

10. Where an above-ground pool structure is used as a barrier, or where the barrier is mounted on top of the pool structure, and the means of access is a ladder or steps, then:

• The ladder to the pool or steps should be capable of being secured, locked or removed to prevent access.
• The ladder or steps should be surrounded by a barrier. When the ladder or steps are secured, locked, or removed, any opening created should not allow the passage of a 4-inch diameter sphere.

These guidelines are intended to provide a means of protection against potential drownings of children under 5 years of age by restricting access to residential swimming pools, spas and hot tubs. Exemptions A portable spa with a safety cover which complies with ASTM F1346-91 should be exempt from the guidelines presented here. Swimming pools, hot tubs, and non-portable spas with safety covers should not be exempt from these provisions.