Health

Some US Populations and Regions Exposed to High Concentrations of Arsenic in Drinking Water-ScienceDaily

A new national survey of public water systems found that arsenic levels were not uniform across the United States, even after implementing the latest national regulatory standards. In the first study to assess differences in public drinking water arsenic exposure by geographical subgroup, researchers at Columbia University’s Mailman School of Public Health found drinking water between specific socio-demographic subgroups and over time. We confirmed that there was inequality in arsenic exposure. Community water systems that rely on groundwater and serve a small population in the southwest, as well as Hispanic communities, are likely to continue to exceed the country’s maximum containment levels, raising concerns about environmental justice. ..Survey results are published online Environmental hygiene outlook..

“This study has important implications for public health efforts aimed at reducing arsenic exposure levels and for promoting environmental justice,” said Anne Nigra, a postdoctoral fellow and lead author of environmental health sciences. The doctor says. “A systematic study of inequality in public drinking water exposure has been lacking. These findings identify communities in urgent need of additional protective public health measures.”

“Our aim is that public arsenic concentrations remain above 10 µg / L after the new maximum arsenic contamination levels have been implemented, thus resulting in cardiovascular disease, associated cancers, and adverse childbirth. “. Dr. Ana Navas Asien, a professor of environmental health science and senior author, said.

Arsenic is a highly toxic human carcinogen and water pollutant found in many aquifers in the United States. An early study by a research team at Columbia University showed that reducing MCL from 50 to 10 µg / L prevented an estimated 200-900 cancer cases annually.

Researchers have compared arsenic concentrations in community water systems during the initial monitoring period (2006-2008) and thereafter (2009-2011) to comply with the EPA’s Maximum 10 µg / L Arsenic Contamination Level (MCL). did. They estimated three-year mean arsenic concentrations in 36,406 local water systems and 2,740 counties and compared the differences in three-year mean and amount of arsenic in both the US region and the socio-demographic subgroup. did.

The analysis was based on data from two of the largest EPA databases of public water available. Using arsenic monitoring data from the 3rd 6-year review period (2006-2011), researchers use approximately 13 million from 139,000 public water systems that serve 290 million people annually. I investigated the analysis record of. Included are data from 46 states, Washington DC, Navajo Nation, and Native American tribes, 95% of the total public water system nationwide, and of the total population served by the public water system. It accounts for 92%.

Regional differences

From 2006 to 2008 to 2009 to 2011, the average community arsenic concentration in the water supply system decreased by 10% nationwide, 11.4% in the southwest and 37% in New England. Despite lower arsenic levels, public drinking water arsenic levels remain high in some socio-demographic subgroups, especially the Hispanic community, the Southwestern United States, the Pacific Northwest, and the central Midwest. did. Similarly, arsenic levels are more likely to be higher in less populated and groundwater-dependent communities.

The proportion of water systems in areas with average arsenic concentrations above 10 µg / L MCL was 2.3% between 2009 and 2011, but 3.2% between 2006 and 2008. A non-Arsenic MCL-compliant community water supply system is available in the southwest (61%) with groundwater (95%), a small population (average 1,102), and a Hispanic community (38%). The sex was high.

Nigra and Navas-Acien have estimated public drinking water arsenic exposure in socio-demographic and geographical subgroups to inform future national and state-level arsenic regulation, non-arsenic exposure He states that equality and compliance with maximum pollution levels are important to assess whether persistence across the United States is important to investigate whether exposure inequality by subgroups contributes to arsenic-related disease disparities. effort. “Our findings help inform public health interventions and regulatory measures needed to address concerns about environmental justice and eliminate exposure inequality.”

“We have state and federal support for small public water system infrastructure and technical assistance to reduce inequality and further protect many US communities affected by increased arsenic exposure to drinking water. We request continued funding from the company, “said Nigra.

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