The EPA’s scientific integrity and policies for reporting violations could become the subject of an internal watchdog’s investigation as the agency proposes sweeping changes to its approach to science in rulemaking.

The Environmental Protection Agency’s Office of Inspector General announced Aug. 31 it would start reviewing the process employees and contractors use to report violations of scientific integrity, focusing on barriers for whistleblowers and employees’ concerns.

Under the agency’s policy, employees at all levels must ensure the...