The Problem

Mercury thermostats can be a major source of mercury contamination in the environment. Mercury is a dangerous neurotoxin. It does not break down in the environment and it bioaccumulates in the tissues of fish, which are then consumed by people. One gram of mercury can contaminate a 20-acre lake. Mercury thermostats, each containing about 3 grams of mercury, have been phased out in California but are still found in many homes and businesses.

Supporting Thermostat Stewardship

In 2008, CPSC and the California Sierra Club co-sponsored AB 2347, the Mercury Thermostat Collection Act. This was the first extended producer responsibility bill to become law in California. The nonprofit Thermostat Recycling Corporation (TRC) was formed to serve as the stewardship organization and to develop a convenient take-back program. Under the law, heating and air conditioning (HVAC) wholesalers must accept mercury thermostats from the public free-of-charge, and contractors who remove mercury thermostats must recycle them. For a free downloadable brochure click here.

tstat recycling corporation


Recycling mercury thermostats protects your local environment from dangerous mercury contamination. Ensure a cleaner environment for you and your neighbors and drop off your mercury thermostat at your local HHW where it can be recycled today! You may even qualify for a $5 rebate from Thermostat Recycling Corporation. Click here to see if you qualify.



In February 2013, CPSC and our partner organizations submitted comments on the proposed regulations to implement the new law, which were adopted in May 2013. CPSC and our allies issued this press release on the final rulemaking.

Articles & Press

AB 2347 press conference at the Palo Alto Water Treatment Facility, October 20, 2008thermostats AB 2347 press conf 2008 10 20Pictured (Left to right): Barbara Spector, Mayor of Los Gatos; Rick Brauch, Dept. of Toxic Substances Control;Heidi Sanborn, CPSC; Ira Ruskin, Assemblymember and Author of AB 2347; Bill Magavern,Sierra Club California; Pat Foster, Mayor of East Palo Alto; Larry Klein, Mayor of Palo Alto;Samantha Omey, Honeywell


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