O'Fallon, MO Swimming Pools & Spas: Pool Permits (2026)
Swimming pool permit rules in O'Fallon, MO, also covering above-ground pools, in-ground pools, and spa installations, set fencing, barrier, alarm, and inspection requirements.
Key Facts
- Adopted code
- 2021 International Swimming Pool and Spa Code
- Permitting authority
- Building and Code Enforcement Department
- Refunds
- Permit fees are non-refundable (§108.6 deleted)
- Appeals
- Follow standard Building Code appeal process
- Violation penalty
- Up to $500 fine or 90 days jail, per day
Summary
O'Fallon Code Section 500.550 adopts the 2021 International Swimming Pool and Spa Code wholesale, folding its permitting and fee framework into city law for every new and existing pool, spa, and hot tub. Anyone building a residential pool works through the same Building and Code Enforcement Division permit process used for other construction.
That certain document, a copy which is on file in the office of the City Clerk of the City of O'Fallon, Missouri, being marked and designated as the International Swimming Pool and Spa Code, 2021 Edition, as published by the International Code Council, be and is hereby adopted as the International Swimming Pool and Spa Code of the City of O'Fallon, in the State of Missouri, for regulating and governing new and existing aquatic vessels and their associated systems as herein provided; providing for the issuance of permits and collection of fees therefor; and each and all of the regulations, provisions, conditions and terms of said Swimming Pool and Spa Code on file in the office of the City Clerk of the City of O'Fallon, Missouri, are hereby referred to, adopted, and made a part hereof, as if fully set out in this Article, with the additions, insertions, deletions and changes, if any, prescribed in Section 500.560 of this Article.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4860992; v58 updated 2026-05-14; through 05-14-2026).
Full Breakdown
560 then amends specific numbered subsections to fit local practice. 1, the adopted code is titled the Swimming Pool and Spa Code of the City of O'Fallon, Missouri. 1. 6 entirely, meaning permit fees collected for a pool project are not refundable once paid. 1, was deleted outright, folding pool appeals into the standard building appeals track rather than a separate pool board. 4 by a fine of not more than $500 or imprisonment not exceeding 90 days, or both, with each day of a continuing violation counted as a separate offense.
Violations & Fines
Building or substantially altering a pool or spa without the required permit, or without a directive or approved plan from the Building Official, is punishable under Section 113.4 of the adopted code by a fine up to $500 and up to 90 days in jail, or both. Each day the pool remains out of compliance counts as its own separate offense, and continued work after a stop-work order carries the same exposure.
Frequently Asked Questions
Do I need a permit to build a residential pool in O'Fallon?
Can I get a refund on a pool permit fee if I cancel the project?
What happens if I appeal a denied pool permit?
Sources & Official References
Other rules in O'Fallon
Compare O'Fallon to another location·View the Missouri swimming pools & spas overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.