Water and Sewer Utility Page

Residential Cross Connections

Residential Cross Connection Brochure

Article II, Division 5 of Chapter 86

Cross Connection Inspections

Cross Connection inspections are required by the Department of Natural Resources (WDNR) to be completed every 10 years. Cross connections are prohibited on all municipal, commercial, industrial, and residential buildings. When an inspection is due, you will receive a blue notice on your front door. A representative from the Utilities Department will come out and complete an inspection and meter change on your property. After the inspection is complete, you will receive a copy of the inspection survey with a list with a list of any violations. Attached to the survey form is a list of devices that should be installed to bring the building up to code.

What is a Cross Connection? A cross connection is a direct or potential connection between any part of the public water supply system and a source of contamination or pollution. An example of a cross connection would be a garden hose submerged in a source of contamination such as a swimming pool, car radiator, or other liquid. Other common cross-connections include dishwashers, toilets, pressure washers, boilers, pools, and lawn sprinkler systems.

Why is cross connection an issue? Cross connection has the potential of contaminating the water at your property. If you lose water pressure and there is a connection with unclean water, that unclean water can be siphoned into the building’s water system. This in known as “backflow”.

How can backflow occur? The two typical ways backflow can occur are “backpressure” and “back-siphonage”. Backpressure is created when a source of pressure, such as a boiler or a pressure washer, creates pressures higher than that supplied by the municipal water system. This can cause potentially contaminated water to be pushed into your plumbing system and the city supply through an unprotected cross connection. Back-siphonage may occur when there is a loss of pressure in the water system during a fire emergency, a water main break, or a system repair. This can create a siphon in the plumbing system which can draw a liquid, such as pesticides, out of a container through an attached or submerged hose.

Methods in preventing backflows. A simple an inexpensive method of preventing backflow with a garden hose is the use of a device known as a vacuum breaker. These devices can be screwed onto your outside faucet(s). These devices will prevent contaminants from being siphoned back into your plumbing and the public water system. Another way to stop backflow is by using an air gap. An air gap can be created by arranging your hose so that the end is at least six inches above the top rim of the container it is being used to fill. This air gap will prevent the contaminant from being siphoned into the water supply. The Village of Mukwonago Water Utility is asking all residential customers to complete the below survey. Please return the survey to the Village Clerk’s Office, 440 River Crest Court, PO Box 206, Mukwonago, WI 53149.