In a research letter in this issue, Rempel et al. compared community water systems that serve the Kern Valley State Prison (KVSP) and three comparable rural communities in California that rely solely on groundwater sources.1 They found that for each of the four systems, arsenic concentrations in drinking water periodically exceeded the legal limit in violation of Safe Drinking Water Act regulations. The communities neighboring the prison benefited from local and federal remediation efforts. Yet, for people who were incarcerated, interventions such as free bottled water were often restricted.