When the Environmental Protection Agency (EPA) specified that the congressional mandate to provide clean drinking water would be interpreted as meaning water could have no more than. 01 microgram per liter of arsenic and still be considered safe for drinking, it exercised the power of?

The answer is Rulemaking

Explanation:

Rulemaking is the process federal agencies use to make new regulations. These regulations affect everything related to individuals in USA soil. From the water to the health care and financial security. The congress passes the broad statues that govern the population, but most of the details are left to federal agencies to establish during the rulemaking process.

The purpose of the new regulations is to fix, solve certain issues or to achieve some goals.