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Welcome to the Orange County Chapter of the American Society of Plumbing Engineers Join Today About Us Why American Society of Plumbing Engineers ASPE. The international organization for professionals skilled in the design specification and inspection of plumbing systems. Because ASPE is dedicated to the advancement of the science of plumbing engineering to the professional growth and advancement of its members and the health welfare and safety of the public. The Society disseminates technical data and information sponsors activities that facilitate interaction with fellow professionals and through research and education expands the base of knowledge of the plumbing engineering industry.