Cities, Counties, some States and Countries have all dramatically limited the use of expanded polystyrene foam or EPS, also commonly known as Styrofoam. An excerpt directly from the San Francisco Ordinance 140-16, amended July 12, 2016 highlights the reasons behind these far reaching actions.
Section 2. Findings. (a) The City and County of San Francisco has a duty to protect the natural environment, the economy, and the health of its citizens. (b) Polystyrene foam, commonly but often incorrectly referred to as "styrofoam" aka "Styrofoam", is an environmental pollutant that is commonly used for packaging and as food service ware in the City and County of San Francisco. (c) Due to the physical properties of polystyrene foam, the U.S. Environmental Protection Agency (EPA) states "that such materials can have serious impacts upon human health, wildlife, and aquatic environment, and the economy." (d) Polystyrene foam packaging and food service ware cannot be recycled through San Francisco's recycling (blue bin) collection program and is otherwise difficult or impossible to recycle, and is not compostable. Compostable or recyclable disposable packaging and food service ware are an affordable, safe, more ecologically sound alternative
The San Francisco Board of Supervisors clearly call out two of the big concerns; impact on health and impact on the environment, and the simple fact that EPS is not easily recycled.
In addition to San Francisco, bans have been enacted in the following locations. This is a listing from the Surfrider foundation, www.surfrider.org.
CALIFORNIA - 65 ordinances that cover restaurants:
OTHER CA Ordinances and Mandates covering Government facilities or specific venues (10):
Florida EPS Bans: