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  • Anthony Flores

The Crucial Role of an Air Gap: Protecting Your Dishwasher and Home

Updated: Jun 9, 2023

A properly installed air gap is an essential component of any dishwasher system. It serves as a critical safety feature that protects your dishwasher, plumbing, and ultimately, your home. In this article, we will delve into the importance of having a properly installed air gap and highlight the potential consequences that can arise if this crucial component is missing. At Turn Key Property Inspectors we will always note and properly advise of a missing dishwasher air gap.

Proper installation of a dishwasher air gap
Dishwasher air gap


Understanding the Air Gap: To comprehend the significance of an air gap, let's first clarify what it is. An air gap is a simple device that creates a physical separation between the dishwasher's drain line and the plumbing system of your home. It consists of a vertical pipe with an open top, usually mounted on your sink or countertop near the dishwasher.


The Function of an Air Gap: The primary purpose of an air gap is to prevent the backflow of wastewater from the plumbing system into your dishwasher. During the dishwasher's operation, it pumps out dirty water through the drain hose. However, if there is a sudden change in pressure within the plumbing system, such as a clog or a high volume of water flowing through the pipes, there is a risk that the wastewater could flow back into the dishwasher.


Consequences of a Missing Air Gap:

  1. Contamination: Without an air gap, the possibility of contaminated water flowing back into your dishwasher increases significantly. This backflow can introduce harmful bacteria, chemicals, or food debris into your dishwasher, rendering your clean dishes unhygienic and potentially causing health hazards for you and your family.

  2. Plumbing Issues: Backflow from the plumbing system can overwhelm the dishwasher's drain line, leading to clogs and blockages. This can result in slow drainage, unpleasant odors, and even water leakage from the dishwasher or beneath your kitchen sink. Over time, these issues can cause water damage to your kitchen cabinets, flooring, and other nearby structures.

  3. Cross-Contamination: In some cases, a missing air gap can lead to cross-contamination between your dishwasher and other appliances connected to the same plumbing system. For instance, if wastewater from a clogged sink flows back into the dishwasher, it can contaminate your dishes and compromise the cleanliness of your dishwasher, sink, and other nearby fixtures.

  4. Compliance and Insurance: Building codes and regulations in many regions require the installation of an air gap for dishwashers. A missing air gap may result in non-compliance, which can lead to penalties or complications when selling your home. Moreover, insurance providers may consider a missing air gap a potential risk, affecting your coverage in case of water damage or related issues.

The Solution: Installing an Air Gap: To ensure the safety and proper functioning of your dishwasher, it is crucial to have an air gap installed correctly. Consult a professional plumber to determine the best location for the air gap and to ensure compliance with local codes and regulations. Installing an air gap is relatively straightforward and involves connecting the dishwasher's drain hose to the air gap's inlet and connecting the air gap's outlet to the sink drain or garbage disposal.


Conclusion: Never underestimate the importance of a properly installed air gap for your dishwasher. This small device acts as a safeguard against potential contamination, plumbing issues, and cross-contamination within your kitchen. By investing in an air gap and adhering to building codes and regulations, you can protect your dishwasher, plumbing system, and home, ensuring a cleaner and safer environment for you and your loved ones.

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