What is the maximum contaminant level for arsenic?

The correct answer pertains to the regulatory standards set for arsenic in drinking water, specifically referring to its maximum contaminant level (MCL). The MCL for arsenic, as established by the Environmental Protection Agency (EPA), is 0.010 milligrams per liter (10 parts per billion). This standard was implemented to protect public health, acknowledging the toxic effects of arsenic, which can lead to serious health issues, including cancer and developmental problems.

The option regarding the MCL being higher than the technically feasible level reflects the ongoing balance regulatory agencies must strike between the feasibility of treatment technologies and public health protections. The technically feasible level may be lower than the set MCL; however, the MCL takes into account various factors, including technological capabilities and the economic impacts on water systems while ensuring that the standards afford adequate protection for consumers.

In this context, other choices hint at misunderstandings regarding the regulation of contaminants like arsenic. The notion that an MCL is not specified due to difficulty in controlling the contaminant misrepresents the regulatory framework because the EPA has explicitly established and enforces limits on arsenic levels. The idea of the MCL being constantly changing is misleading as the standards are set based on comprehensive research and public health assessments and