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Safe drinking water is a foundational public health guarantee and, in principle, a universal right in the United States. In practice, the distribution of water infrastructure failures follows the same patterns of race and income that characterize most environmental health disparities. The Flint, Michigan water crisis, which exposed roughly 100,000 residents, predominantly Black and low-income, to elevated blood lead levels from 2014 to 2019, brought national attention to water infrastructure failure and the role of institutional decisions in determining who bears the risk. But Flint was not an anomaly. It was a visible example of a widespread and largely invisible problem.

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== The Scale of Lead Service Line Exposure ==

The Environmental Protection Agency estimates that between 6 and 10 million service lines in the United States still contain lead. Lead service lines connect the water main to individual homes and were widely installed before their health risks were understood. They are not evenly distributed. Older cities with aging infrastructure, lower-income communities that have underinvested in utility system replacement, and communities of color that have faced disinvestment in public infrastructure disproportionately bear the lead exposure risk. Newark, Baltimore, Chicago, Pittsburgh, and dozens of other cities have faced lead contamination crises in recent years, each demonstrating that Flint was a warning rather than an outlier.

The health consequences of lead exposure are severe and irreversible. Lead is a neurotoxin with no known safe level of exposure. Effects on developing brains are permanent: lead exposure in childhood reduces IQ, impairs executive function, increases risk of behavioral problems and learning disabilities, and is associated with higher rates of criminal behavior in affected cohorts. The children who were exposed in Flint will carry those effects for life. The children currently being exposed in communities where lead service lines have not been replaced face the same outcome.

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== Policy Responses and Priorities ==

The Infrastructure Investment and Jobs Act of 2021 appropriated $15 billion specifically for lead service line replacement, the largest federal investment in drinking water infrastructure in decades. This is substantial and meaningful. It is also insufficient. Estimates of the total cost of lead service line replacement nationally range from $45 to $60 billion, meaning the federal appropriation covers between a quarter and a third of the need. Prioritization decisions about which communities receive replacement funds first have significant equity implications, and environmental justice advocates have pushed for prioritization criteria that center the communities with the highest exposure burden and the least financial capacity to fund replacement independently.

Transparency and notification requirements matter alongside physical infrastructure investment. Communities have a right to know whether their service lines contain lead, what their water quality testing shows, and when replacement will occur. The Safe Drinking Water Act's lead and copper rule has been updated to strengthen testing and notification requirements, but enforcement capacity and community trust in utility communications vary significantly by jurisdiction. In communities where institutional trust has been damaged by past exposure or inadequate response, community-based outreach and independent water testing have been more effective than utility-driven communication in reducing exposure through behavioral changes like flushing before use and filtered water use.

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== Beyond Lead: Emerging Contaminants ==

Lead service lines are the most visible drinking water infrastructure problem, but not the only one. Per- and polyfluoroalkyl substances (PFAS), a class of industrial chemicals that do not break down in the environment or the human body, have contaminated drinking water sources in communities near manufacturing sites, military bases, and firefighting training facilities. PFAS are associated with cancer, thyroid disease, immune dysfunction, and developmental effects. The EPA has established maximum contaminant levels for PFAS in public water systems, requiring testing and remediation that will involve significant cost. The communities bearing the highest PFAS burden, like the communities bearing the highest lead burden, tend to be those with the least political power to have prevented the contamination or to fund the remediation. The pattern of environmental injustice is consistent across contaminants and contexts.

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''Originally published April 5, 2024 on [https://docmoates.com/blog/water-infrastructure-and-environmental-justice-who-bears-the-risk/ docmoates.com].''