Drinking Water System The City of Marianna owns and operates its own potable drinking water system. It provides safe potable water for the citizens of Marianna and surrounding communities. The water system utilizes three remote well sites, one elevated storage tank, and one ground storage tank. Usage The city uses an average of 1.4 million gallons daily from the Floridan aquifer. Testing We test the water daily to ensure the utmost quality and safety. We remain in full compliance with the Department of Environmental Protection and Environmental Protection Agency regulations.