Mercury switches are found in a variety of items ranging from chest freezers to sump pumps. Mercury-containing tilt switches are found in or under the lids of clothes washers and chest freezers. They stop the spin cycle or turn on a light. They are also found in motion-sensitive and position-sensitive safety switches in clothes irons and space heaters. If a mechanical switch is not visible in these items, a mercury switch is probably being used. Float switches are commonly used in sump pumps and bilge pumps to turn the equipment on and off when the water is at a certain level. These switch devices are often visible.

Automobile trunk and hood light switches often contain mercury. If the light goes on when the lid is partially up, or if you can see that the bulb housing is deliberately mounted at an angle to the hood, a mercury switch is probably being used. A variety of manufacturing processes use relays to control power to heaters or pumps. Relays that contain mercury switches activate airbags, anti-lock brakes (primarily found in four-wheel drive vehicles), some seat belt systems, and some automatically adjusting suspension systems. Some agricultural equipment, military vehicles, mass transit vehicles, and fire hook and ladder equipment also contain mercury switches.

Look for tags or labels that identify the switch or relay as containing mercury. In most cases the repairperson will take the replaced switch and properly dispose of it. Recycling is the proper method of disposal. DO NOT throw mercury-containing switches or relays in the trash. If you need further information, visit the Brown County Household Hazardous Waste Facility at 2561 S. Broadway or call the Recycling Hotline (920)448-4400.