What is the regulated limit for arsenic in drinking water?

• A. 5 ppb
• B. 10 ppb
• C. 15 ppb
• D. 20 ppb

Answer: (B)

The regulated limit for arsenic in drinking water is set at 10 parts per billion (ppb). This standard is established by the U.S. Environmental Protection Agency (EPA) under the Safe Drinking Water Act. The limit was designed to protect public health by minimizing exposure to this toxic element, which can cause various health issues, including cancer and cardiovascular diseases. The determination of this regulatory limit involved extensive research into the health effects of arsenic and the feasibility of detecting and removing it from drinking water supplies. Establishing a lower limit such as 10 ppb aims to ensure safe levels of arsenic in drinking water while considering the costs and technical abilities of water utilities.