AN ACT to amend Tennessee Code Annotated, Title 4, Chapter 5, relative to regulatory actions.
SB0880 creates a new section in Tennessee’s administrative procedures law, titled the “Sound Science in Regulations Act.” It restricts state agencies from adopting certain rules that set numeric criteria or numeric limits for contaminants, pollutants, hazardous substances, solid waste, or hazardous waste unless the agency’s scientific basis meets a defined “best available science” standard and, for human health-related rules, shows a direct link to manifest bodily harm in humans. The bill applies to rules affecting drinking water, water pollution control, contaminated site remediation, air quality, and solid or hazardous waste handling.
The bill defines “best available science” in detail, emphasizing reliable, unbiased, and objective information, including site-specific studies, peer-reviewed journal articles, external peer-reviewed federal reports, and certain EPA screening or contaminant levels. It also defines what counts as a “refereed journal” and limits how EPA benchmarks may be used. The act applies only to agency rules adopted on or after July 1, 2025, that are more stringent than federal law or adopted where no federal regulation exists, and it excludes rules required by federal law, substantively equivalent federal rules, rules from the departments of agriculture and health, and emergency rules.
The bill’s practical effect is to raise the evidentiary threshold for future environmental and public health regulations in Tennessee, especially where agencies seek to impose stricter-than-federal numeric standards. It could constrain rulemaking by environmental regulators and other agencies covered by Title 4, Chapter 5, while preserving rules mandated by federal law or emergency actions. The measure is prospective only and does not appear to invalidate existing rules.
Overall sentiment appears generally favorable among legislative committees and on the floor, as the bill advanced through committee with 7-2 votes and passed both chambers, though not unanimously. The vote margins suggest meaningful support but also notable opposition, likely reflecting disagreement over whether the bill appropriately ensures scientific rigor or instead makes it harder for agencies to adopt protective environmental standards.
The main point of contention is the bill’s requirement that human-health-based numeric limits be tied to a direct link to manifest bodily harm, along with its narrow definition of acceptable science. Supporters likely view this as a safeguard against arbitrary or overreaching regulation, while opponents may see it as a constraint on agency discretion and a higher bar than current scientific or risk-based regulatory practice. The exclusions for agriculture and health rules, and for federal or emergency rules, also suggest an effort to limit the bill’s reach while still reshaping environmental rulemaking.
SB0880 amends Tennessee Code Annotated Title 4, Chapter 5 by adding a new regulatory standard that agencies must satisfy before adopting certain environmental and hazardous-substance rules. It affects state administrative rulemaking for drinking water, water pollution, air quality, contaminated sites, and waste handling by requiring a defined scientific showing for new numeric limits, especially those stricter than federal requirements. The bill does not change substantive environmental statutes directly, but it changes the procedural and evidentiary framework agencies must use when promulgating future rules.
The bill appears to have received generally favorable treatment in the legislature, advancing through committee and passing both chambers. The recorded votes show solid majorities but also a consistent minority of opposition, indicating that the measure was supported enough to pass but remained controversial. The pattern suggests lawmakers were divided between those prioritizing scientific rigor and regulatory restraint and those concerned about limiting environmental and public-health protections.
The central controversy is whether the bill’s “best available science” and “direct link” requirements are a reasonable guardrail or an unduly restrictive barrier to regulation. Opponents are likely concerned that the bill could prevent agencies from acting on emerging science, risk assessments, or precautionary standards before harm is conclusively demonstrated, while supporters likely argue that agencies should not impose numeric limits without strong, objective scientific support. Additional tension comes from the bill’s selective exemptions and its restriction to rules more stringent than federal law, which may be viewed either as a narrow tailoring or as a deliberate limitation on state regulatory authority.