Is a dishwasher air gap required in Washington State

The Washington State health code requires all commercial dishwashers, ice machines and vegetable sinks to have the physical air gap because they know what the bacteria can do.

Are air gaps required in Washington?

States including California, Washington, Minnesota, and Hawaii have all adopted a dishwasher air gap installation as a mandatory residential plumbing procedure. In these parts of the country, air gaps are certainly necessary. A plumber installing a new dishwasher will require you to have an air gap connection.

What states require air gaps?

They are required by Code in only a handful of states; according to the thread, California, Texas, Washington, Nevada and maybe a couple others. The air gap is to prevent dirty water from your dishwasher from flowing back into the dishwasher to re-dirty the dishes.

Is there an alternative to dishwasher air gap?

However, if you’d prefer not to use that fitting, there is a dishwasher air gap alternative. You can make a “high loop“, a unique configuration of the drain hose that takes the line up above the water level. The loop is installed beneath the sink base in the cabinet.

Do dishwashers have a built in air gap?

Dishwashers require a way to funnel in clean water and drain out dirty water. A dishwasher air gap is a component that is installed in between the drain hose of a dishwasher and a sink drain or garbage disposal. These components can be mounted into a spare sink receptacle, or through a hole drilled in a countertop.

What is a Johnson tee?

The Johnson Tee is an ASPE approved alternative venting system for dishwashers, and has been popular throughout Western Washington for 25 years. The Johnson Tee replaces the traditional deck-mounted air gap, which usually sits to the left or right of the kitchen sink.

Is a dishwasher air gap required in Oregon?

Domestic or commercial dishwashing machines shall comply with the applicable standards referenced in Table 1401.1. 414.2 Backflow Protection. The water supply connection to a commercial dishwashing machine shall be protected by an air gap or a backflow prevention device in accordance with Section 603.3.

Do you need a high loop if you have an air gap?

GE: “If an air gap is not required, the drain hose must have the high loop from the floor to prevent backflow of water into the dishwasher or water siphoning out during operation.”

How do I stop my dishwasher from getting an air gap?

Dishwasher venting prevents dirty water from re-entering the dishwasher. There are several common ways to do this: creating a high loop in the drain hose, connecting the hose to an air gap fitting, or installing a check valve on the drain line.

Why a dishwasher will not drain?

Water in the bottom of the dishwasher results from clogs in the filter, garbage disposal, drain hose, drain pump, or air gap. When food or sediment build up within these systems, the dishwasher won’t drain properly. Locating the blockage and clearing the debris will solve the problem.

Article first time published on

What's an air gap on a dishwasher?

The air gap is a chrome plated cylinder located on the back of the sink where the faucet is located. Not all areas have plumbing codes that require an air gap, so you may not have one installed with your dishwasher drain. The air gap prevents water from a clogged drain from backing up into the dishwasher.

How much does it cost to install a dishwasher air gap?

Additional Considerations and Costs An air gap prevents wastewater from re-entering the dishwasher and contaminating clean water. Dishwasher air gap installation costs $5-$30, and it is done before installing the new dishwasher. Not all dishwashers require this, so consult your appliance manual to be sure.

Do Samsung dishwashers need an air gap?

Dishwashers require the drain hose to be connected to either an air gap or for the drain hose to have a high loop. These features are responsible for preventing the wastewater from the dishwasher from returning to the dishwasher.

Does a Bosch dishwasher need an air gap?

The Bosch Instruction manual states: “If no air gap is used and the drain line is run into a sink or disposer, the drain line must be elevated to a point higher than the highest water level of the sink to prevent back siphoning into the dishwasher.”

Do LG dishwashers need an air gap?

How to Clean the Air Gap – Dishwasher. If your LG dishwasher requires an air gap, it is recommended to routinely remove debris and blockages to maximize dishwasher performance. Blockages in the air gap may result in an OE error code or slow drainage.

Does a dishwasher have to be connected to a garbage disposal?

Related Articles Installing a new dishwasher does not require a garbage disposal and this optional appliance can be bypassed with particular piping attachments. However, residents must include an air gap within the new dishwasher installation so that the appliance agrees with local regulations.

Where do you put an air gap?

Air gaps should be located in places where that discharged water will go to the drain; not all over a countertop, and especially not underneath a countertop.

Are dishwasher air gaps required in Kentucky?

Fixture BranchesNominal Pipe Size (Inches)Drinking fountain1/2Dishwasher (domestic)1/2Kitchen sink (res.)1/2Kitchen sink (com.)1/2 or 3/4 as required

Can a dishwasher have its own drain?

I would say you should be fine. Normally the dishwasher hot water and drain lines tie right into the sink hot water and drain lines, but you could give it a separate hot water and separate drain of its own.

What is a dishwasher tee?

These devices are a great way to vent the dishwasher as the washer will then have its own trap and you won’t have to have that unsightly cap attached to the sink or the countertop. … It also ensures that the air gap is well above the sink rim.

What is a high loop air gap for a dishwasher?

A high loop is when the dishwasher drain is elevated right before its connection to the kitchen sink drain. The drain hose is secured near the top of the sink in some fashion (could be as easy as using a zip tie to secure it).

Does a dishwasher need a trap?

Your dishwasher does need a trap in order to prevent sewer gases from wafting up into the dishwasher pump and into the dishwasher. You can use the same trap that your sink uses, though. There are a couple of ways to do that.

What does a sink air gap do?

When installed and maintained properly, the air gap works as described above, and prevents drain water from the sink from backing up into the dishwasher, possibly contaminating dishes.

Why do you need an air gap?

Plumbing codes call for an air gap between portable water and a drain. This gap is usually about the distance between the faucet and the top of the sink or bathtub (one inch or more). Basically, the air gap is there to prevent accidental backflow. If contaminated water backflows, it can cause serious health risks.

Do plumbers put in dishwashers?

Yes, plumbers do install dishwashers! And, you should call a plumber to install your new dishwasher. Many home projects are DIY-appropriate, but when it comes to installing an appliance that requires plumbing know-how, it’s best to call a licensed professional to ensure installation success.

How much does Lowes charge to install dishwasher?

StoreAverage CostLowe’s$125 – $450Home Depot$99 + $19.99 Install Kit + $9.99 AdaptorBest Buy$159.99

Why is water coming out of my air gap?

In a properly functioning air gap, the dishwasher hose attaches to an input on the air gap, and the water is expelled out the end. … One of the most common reasons for an air gap clog is failure to remove the knockout plug from the input where the water line enters the garbage disposal.

Does Bosch 800 need an air gap?

According to the Bosch website, they are requiring air gaps in local codes to prevent backflow. It is possible to prevent back flow into the dishwasher by connecting the drain line to an air gap or using a 30″ high drain loop.

Where is the air gap on my Bosch dishwasher?

Locate your air gap. It’s usually a little hood or cylinder at the back of your sink. Remove the cover. Most just unscrew or pop off by hand, but some have a small screw that holds it in place.

Where does a Bosch dishwasher vent?

The vent on your Bosch is connected to a tube that first runs up the side of the d/w and then down to the base. The air in the tube condenses and the moisture runs back into the tub. Any remaining moisture (very little if any)will vent to the enclosed base at the bottom of the d/w..