Administrative Procedure (UAPA) - As enacted, generally prohibits a governmental agency from adopting a rule or establishing numeric criteria or numeric limitations applicable to a contaminant, pollutant, hazardous substance, solid waste, or hazardous waste that relates to drinking water, water pollution control, hazardous substances, contaminated site remediation, air quality, or solid or hazardous waste handling unless certain conditions are met. - Amends TCA Title 4, Chapter 5.

SB 880, effective July 1, 2025, requires Tennessee environmental agencies to base new regulations on "best available science" for drinking water, air quality, hazardous substances, and waste handling. It prohibits agencies from adopting stricter rules than federal standards (or new rules without federal equivalents) unless the science is reliable, unbiased, peer-reviewed, and demonstrates a causal link between exposure and human health harm. The law applies only to new regulatory actions after July 2025, not existing rules or federal compliance requirements. It directly affects agencies like the Tennessee Department of Environment and Conservation when creating new environmental standards.