Synopsis As Introduced Creates the Mercury Thermostat Collection Act. Requires certain thermostat manufacturers, not later than October 1, 2011, to submit to the Illinois Environmental Protection Agency a plan that describes a collection and financial incentive program for mercury thermostats. Requires these manufacturers, no later than January 1, 2012, to implement the Agency-approved plan and to report certain information about their collection efforts by April 1, 2012 and April 1 of each year thereafter. Prohibits, beginning on April 1, 2011, a thermostat wholesaler from selling or distributing thermostats unless it acts as a collection site for thermostats that contain mercury, participates in an education and outreach program to educate consumers on the collection program for mercury thermostats, and meets other requirements. Provides that manufacturers, thermostat wholesalers, and thermostat retailers are subject to certain sales prohibitions beginning on April 1, 2011. Provides for public comment on manufacturer plans. Requires the Agency to post certain information on its website, conduct an educational program, and report certain information about the program to the legislature. Authorizes the Agency to modify manufacturer plans and conduct certain investigations. Defines "Agency", "Board", "out-of-service mercury thermostat", "person", "thermostat manufacturer", "thermostat retailer", and "thermostat wholesaler". Effective immediately.