Alerting Localities of Environmental Risks and Threats Act of 2021 This bill requires the owner or operator of a facility where hazardous chemicals are produced, used, or stored to hold a public meeting within 72 hours of the release of an extremely hazardous substance. The owner or operator must publish a notice in a local newspaper, giving at least 24 hours of notice before the public meeting. Such notice must be posted at a local library, other local government buildings, and on the facility's public website. The bill also requires the owner or operator of a facility to hold an annual public meeting, where specified information regarding the extremely hazardous substances at the facility must be disclosed. Notice for such meeting must be published in a local newspaper at least a week in advance of the meeting. The bill provides for a civil penalty if such public meeting and notice requirements are not met.