“Substantial and material structural change” means an alteration or repair that:

1. A. Increases the volume of the swimming pool or spa by 15 percent or more; or
2. B. Decreases the flow capacity of the swimming pool or spa by 15 percent or more.

Authority: Public Safety Article, §§12-1203 and 12-1207(a)(2), Annotated Code of Maryland

Effective date: January 22, 2024 (51:1 Md. R. 16)

Regulation .03 amended effective March 30, 2026 (53:6 Md. R. 287)

Regulation .05 amended effective March 30, 2026 (53:6 Md. R. 287)