Swimming pool permit rules in O'Fallon, IL — also covering above-ground pools, in-ground pools, and spa installations — set fencing, barrier, alarm, and inspection requirements.
A St. Clair County building permit is required to build a swimming pool. County fees are $150 for an in-ground pool and $75 for an above-ground pool. Pools are governed by the adopted International Swimming Pool and Spa Code, 2012.
In unincorporated St. Clair County the Building & Zoning Department issues pool permits under its Building Regulations, which adopt the International Swimming Pool and Spa Code, 2012 (Article IX). The fee schedule sets in-ground pools at $150 and above-ground pools at $75. Prefabricated pools less than 24 inches deep are exempt from a building permit. Inside a municipality (Belleville, O'Fallon, Fairview Heights, East St. Louis, Cahokia Heights), apply to that city or village instead. Public/commercial pools are separately regulated by the St. Clair County Health Department under Illinois DPH's Swimming Facility Code, 77 Ill. Adm. Code 820.
Building without a required permit is a code violation; work may be halted and inspection/re-inspection fees ($75 each) added until the pool is brought into compliance.
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