Connections Between Present-Day Water Access and Historical Redlining

Although challenges in water and sanitation access are often assumed to be issues of low- and middle-income nations, more than 400,000 homes in the United States still lack access to complete indoor plumbing. Previous research has demonstrated that the remaining plumbing challenges are more prevalent in communities with high Black and Brown populations. This study hypothesizes that the 1930s practice of redlining by the Home Owners' Loan Corporation (HOLC), which systematically denied loans to minority populations, is linked to present-day inadequate plumbing access (i.e., defined as incomplete plumbing above the national average). Digitized HOLC maps for 202 urban areas across the country and U.S. Census data from the 2016 to 2020 American Community Survey were combined to interpolate the modern-day plumbing access for historical neighborhoods (n = 8871 communities). Analysis via binomial logistic regression demonstrated that nationally, redlined communities (HOLC Grade "D") are significantly more likely to have a rate of incomplete plumbing above the national average compared with greenlined communities (HOLC Grade "A") (0.1352; confidence interval = & PLUSMN;0.036). This finding was also observed for three of the nation's four census subregions (Northeast, Midwest, and West). Slight differences by region in relationships between the proportion of specific racial/ethnic populations on rates of incomplete plumbing demonstrate the need for targeted place-based interdisciplinary examinations of exclusionary practices. The demonstration of the present-day impacts of redlining after nearly 90 years emphasizes the need to intentionally mitigate past injustices to ensure modern-day equity.