Fireworks will be prohibited this Fourth of July due to a water supply shortage caused by a previous water main leak. The prohibition declared by Eastside Fire & Rescue Fire Chief Ben Lane was announced May 1, the same day City Manager Jessi Bon signed a proclamation declaring a local emergency due to a reduction in the supply of incoming potable water. The City of Mercer Island contracts its fire services with Eastside Fire & Rescue. The emergency proclamation notes the backup water supply pipeline currently being used to provide potable water is 2.73 million gallons per day. The island's daily potable water demand during the summer averages 2.83 million gallons per day. That number spikes in July, when demand hits more than 3 million gallons per day, according to the proclamation.