Fig. 1: Map of the percent of county households without full indoor plumbing as reported by the 2014–2018 American Community Survey.
From: The widespread and unjust drinking water and clean water crisis in the United States

Households are determined to have incomplete plumbing if they do not have access to hot and cold water, a sink with a faucet, a bath or shower, and—up until 2016—a flush toilet.