St. Louis County, MO Swimming Pools & Spas: Fencing & Safety Requirements (2026)
Key Facts
- Governing code
- Ch. 1118 SLCRO §§ 305.2.1, 305.2.10
- Residential barrier height
- 48 inches minimum above grade
- Public pool barrier height
- 72 inches minimum above grade
- Residential water setback
- 20 inches minimum from water's edge
- Gap under barrier
- 2 in. unpaved / 4 in. solid surface
- Enforcing agency
- Dept. of Transportation and Public Works
- Max penalty
- $1,000 fine or 90 days jail
Summary
Every swimming pool and spa in unincorporated St. Louis County needs a code-compliant barrier under Chapter 1118, the county's 2015 International Swimming Pool and Spa Code as amended. Residential pools get a reduced 48-inch minimum barrier height, a 3-foot buffer around the perimeter, and a 20-inch minimum setback from the water's edge instead of the general 60-inch rule, with tight limits on the gap beneath the fence.
305.2.1 Barrier height and clearances. Barrier heights and clearances shall be in accordance with all of the following: 1.The top of the barrier shall be not less than 72 inches (1829 mm) above grade where measured on the side of the barrier that faces away from the pool or spa. Such height shall exist around the entire perimeter of the barrier and for a distance of 3 feet (914 mm) measured horizontally from the outside of the required barrier. Exception: For residential swimming pools the top of the barrier shall be not less than 48 inches (1219 mm) above grade where measured on the side of the barrier that faces away from the pool or spa. Such height shall exist around the entire perimeter of the barrier and for a distance of 3 feet (914 mm) measured horizontally from the outside of the required barrier. ... 305.2.10 Poolside barrier setbacks. The pool or spa side of the required barrier shall be not less than 60 inches (1524 mm) from the water's edge. Exception: For residential swimming pools the pool or spa side of the required barrier shall be not less than 20 inches (508 mm) from the water's edge.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 85 | Traffic: Supplement 80).
Full Breakdown
103 amends Chapter 3 of the 2015 International Swimming Pool and Spa Code to set the barrier standards St. Louis County enforces. 1 requires the top of a pool barrier to stand at least 72 inches above grade around the entire perimeter and for 3 feet outward from the barrier, but carves out a residential exception dropping that to a minimum of 48 inches above grade, measured on the side facing away from the pool, for the same full perimeter and 3-foot horizontal distance. The same section caps the vertical gap beneath the barrier at 2 inches above unpaved grade such as grass or gravel, and 4 inches above a solid surface such as concrete.
10 sets the barrier's distance from the water itself at 60 inches for public pools, reduced to a 20-inch minimum setback for residential pools. 4, and the pool manufacturer's instructions permit using the wall this way. Enforcement runs through the Department of Transportation and Public Works building official under the same Section 114 violations and Section 113 Board of Appeals provisions that govern every other Chapter 1118 requirement, so a missing or undersized barrier is cited exactly like an unpermitted pool.
Violations & Fines
An undersized, gapped, or missing pool barrier is a Swimming Pool and Spa Code violation under Section 114, carrying the same penalty as any other breach of Chapter 1118: a fine of up to $1,000, up to 90 days in jail, or both, with each day the hazard continues counted as a separate offense. The building official can also issue a stop-work order until the barrier is corrected.
Frequently Asked Questions
How tall does a pool fence have to be in St. Louis County?
How close can a residential pool barrier be to the water?
Can the pool's own wall serve as the required barrier?
What is the penalty for an unfenced pool in St. Louis County?
Sources & Official References
Other rules in St. Louis County
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