IDEM Issues Key Clarification on SEA 277: Here's What It Means for Your Site

Statute Update

Senate Enrolled Act (SEA) 277 took effect on July 1, 2026, introducing new statutory requirements for petroleum underground storage tank (UST) corrective action in Indiana. On the same day, the Indiana Department of Environmental Management (IDEM) issued a clarification letter explaining how it will implement one of the law's most significant provisions, addressing the very ambiguity KERAMIDA had raised.

Earlier this year, KERAMIDA's Lauren Nielsen, P.E., Senior Engineer, Land Services, testified before the House Environmental Affairs Committee of the Indiana General Assembly regarding Indiana SEA 277. During her testimony, Lauren highlighted the need for greater clarity around the legislation's use of the term "reportable quantity" for petroleum releases, noting that petroleum is excluded from the federal hazardous substance definitions referenced elsewhere in the statute. She continued those discussions with IDEM representatives, environmental attorneys, and other stakeholders as implementation moved forward. IDEM's July 1 clarification letter speaks directly to the point KERAMIDA identified. 

What the Clarification Addresses 

Under SEA 277, IDEM cannot issue a No Further Action (NFA) determination, approve closure, or request certain institutional controls unless the commissioner has received and reviewed an evaluation of potential remedies. That requirement is triggered whenever a "reportable quantity" of released petroleum remains or may remain underground at a site. 

As IDEM acknowledges, the term "reportable quantity" is not defined for petroleum USTs. Working with the statute as written, the agency has taken a practical approach: it will look to the federal UST rule at 40 CFR 280.53, which addresses reporting of petroleum spills exceeding 25 gallons, for interpretive guidance. Because it is often not feasible to quantify how much petroleum was actually released, IDEM will treat any petroleum release-related chemical (RRC) remaining above its Risk-based Closure Guide (the "R2," a nonrule policy document) Published Levels as triggering the requirement to submit an evaluation of closure options, environmental deed restrictions, and remediation methods, together with estimated costs and timeframes. 

Updated State Forms 

IDEM has also updated State Form #55439 and State Form #55441 to reflect the new statutory requirements, a welcome development. Prior versions required the certifying environmental professional to attest that submittals complied with 329 IAC 9-5-5.1 and 329 IAC 9-5-6, sections that were repealed in 2023 and replaced by incorporation of the federal 40 CFR Part 280 requirements. The updated forms resolve a real practical problem for the professionals who sign these submittals. Copies are available on the IDEM forms page. 

Corrective Action Should Follow Risk, Not Screening Levels 

KERAMIDA advocated during the legislative session for a clear definition of "reportable quantity." That clarity was not written into the statute, but the requirement is now law. Importantly, though, a requirement to evaluate potential remedies is not a mandate to implement them. IDEM's own R2 is built around determining whether a remedy is actually necessary to control an unacceptable risk to human health or the environment, and under that framework, remedies are selected only where warranted. An exceedance of a generic, published screening level is the starting point for a risk evaluation, not the conclusion of one. 

That distinction matters for clients. A broad evaluation requirement could tempt some consultants to recommend extensive investigation, monitoring, and active cleanup that site conditions do not justify. KERAMIDA takes the opposite approach. We apply the best available science to determine whether corrective action is genuinely necessary, recognizing that it is warranted only when a release currently poses, or will foreseeably pose, an unacceptable risk. In many cases, natural source zone depletion (NSZD), which is the natural biodegradation, dissolution, and volatilization that steadily reduces petroleum in the subsurface, removes contaminant mass at rates that meet or exceed engineered remediation, and the Interstate Technology and Regulatory Council (ITRC) recognizes it as a legitimate stand-alone or supporting remedy where exposure risks are controlled. Where natural attenuation processes such as NSZD will achieve remediation objectives within an acceptable timeframe, aggressive engineered systems are often neither necessary nor the most sustainable option. 

What This Means for You 

For petroleum UST owners, operators, consultants, and contractors, IDEM's clarification offers valuable insight into the agency's expectations under the new law and the additional information that may now be required before site closure. It also raises the stakes on choosing a consultant who scopes work to actual risk. Performing investigation, monitoring, and remediation at a site that does not need it will not only delay closure but can also needlessly draw down the Excess Liability Trust Fund (ELTF), the state fund that reimburses eligible corrective-action costs. Clients who want their obligations met efficiently and their ELTF resources conserved are well served by a risk-based approach grounded in sound science. 

KERAMIDA remains committed to helping clients navigate evolving environmental requirements through technical expertise, regulatory and legislative engagement, and practical implementation strategies. Lauren's testimony and continued engagement with stakeholders reflect KERAMIDA's commitment to advancing clarity for the benefit of our clients and to ensuring that corrective action is driven by what the environment and the client actually need. 

Contact: 

Lauren Nielsen, P.E.
Senior Engineer, Land Services
KERAMIDA Inc.

Contact Lauren at: lnielsen@keramida.com