Wisconsin Administrative Code
Department of Agriculture, Trade and Consumer Protection
ATCP 55-89 - Food, Lodging, and Recreation Safety
Chapter ATCP 75 - Retail Food Establishments
Appendix - Wisconsin Food Code
Chapter 5 - Water, Plumbing, and Waste
Part 5-2 - PLUMBING SYSTEM
Subpart 5-203 - Numbers and Capacities
Section 5-203.15 - Backflow Prevention Device, Carbonator

If not provided with an air gap as specified under § 5-202.13, an APPROVED dual check valve with an intermediate vent conforming to the State Uniform Plumbing Code chs. SPS 381 to 387, as enforced by the Wisconsin department of safety and professional services, shall be installed upstream from a carbonating device and downstream from any copper in the water supply line. P

Contact the Safety and Building Division at the department of safety and professional services, P.O. Box 2509, Madison, WI 53701, telephone 608-266-3151 and 711 (TTY) or https://dsps.wi.gov/pages/home.aspx.