Indiana environmental rules now reference the 2022 federal code, not 2018

Indiana's environmental rules now use the 2022 version of federal regulations, updating from the 2018 edition. This means state environmental permits and compliance checks will now follow the latest federal definitions and standards.

This is a small, routine update, but it matters because environmental regulations are built on layers of references. When a state updates its reference to federal code, it means all the specific definitions, testing methods, and compliance requirements tied to that code also update. This ensures Indiana's environmental enforcement aligns with current federal expectations, which can affect everything from air pollution limits to waste disposal rules.