disproportionately impacted by unsafe drinking water and associated health problems in the united states. specifically, native american reservations and communities with dense latino and african american populations are at higher risk of exposure to drinking water contaminants. contaminants found in the drinking water of such communities include nitrates, coliform, and lead, which have been linked to cancer, reproductive health problems, gastrointestinal illness, and other health problems. one study found that levels of contaminants in the drinking water of two nebraska native american reservations were significantly higher than regional contaminant levels. another study found that latino residents in tucson, arizona, had higher than average levels of contaminants in their drinking water, which were linked to higher rates of cancer and neurological disorders among residents. also, it is understood that low-income residents in the appalachian region of west virginia are disproportionately exposed to contaminants in drinking water from coal mining in the region. in addressing the updated priorities associated with the act, epa states that its first priority is to "promote equity... in disadvantaged, small, and environmental justice communities," specifically addressing that disadvantaged communities face disproportionate risks associated with exposure to contaminated drinking water.