Federal Institutional / Engineering Control Registries
These are registries and public lists of institutional controls (legal and administrative restrictions) and engineering controls (physical measures). The inquiry rule defines institutional controls, the standard defines engineering controls, and the National Contingency Plan says when a federal remedy is expected to use either.
What puts a property on this record
Institutional controls are defined in the inquiry rule:
Institutional controls means: non-engineered instruments, such as administrative and/or legal controls, that help to minimize the potential for human exposure to contamination and/or protect the integrity of a remedy.
40 CFR 312.10, edition revised as of July 1, 2025
The standard defines engineering controls as physical changes made to a site or facility to cut or remove the chance that people are exposed to hazardous substances or petroleum products in soil or groundwater. Capping and slurry walls are among its examples, and it counts engineering controls as one kind of activity and use limitation (E1527-21, 3.2.26).
In developing remedial alternatives, EPA generally shall consider certain expectations (40 CFR 300.430(a)(1)(iii)). Among them: containment and similar engineering controls for waste of relatively low long-term threat or waste that cannot practicably be treated, and institutional controls, deed restrictions and limits on water use among them, added to engineering controls as appropriate (40 CFR 300.430(a)(1)(iii)(B), (D)).
In a remedy under the National Contingency Plan, institutional controls are limited. They may be used during the investigation and remedial action and, where necessary, as part of the completed remedy. They may not be the sole remedy in place of active measures such as treatment or containment, unless those measures are determined not to be practicable after the trade-offs among alternatives are balanced (40 CFR 300.430(a)(1)(iii)(D)).
What a listing shows, and what it does not
The standard describes these registries as databases an agency may keep to track sites that may hold residual contamination and activity and use limitations, and it treats such a limitation as one sign of a past or present release (E1527-21, 3.2.40, 5.1). The inquiry rule says the review for the subject property should include registries or public lists of both kinds of control (40 CFR 312.26(b)(6), (b)(7)).
The National Contingency Plan passages state what EPA expects to consider. They do not say that any given site has either kind of control, or that one is in place or working.
The sections cited are silent on which programs keep these registries, whether a registry is complete, and a control's terms, owner or maintenance duties. The standard adds that deciding a past release is subject to required controls does not imply the professional has evaluated or confirmed the control's adequacy, implementation or continued effectiveness (E1527-21, 3.2.17.1).
In a Phase I ESA
Federal institutional control and engineering control registries are a standard government record source with a search scope of the subject property only (E1527-21, 8.2.2, Table 2). A separate row covers state and tribal registries.
If the subject property or an adjoining property is listed on a standard source, the standard says the agency's file on the listing should be reviewed, to help the environmental professional judge whether the listing means a recognized environmental condition, a controlled or historical one, or a de minimis condition at the subject property. If the professional skips that review, the report must say why. Other records, or interviews with regulatory officials, may stand in, with a summary and an opinion on whether they suffice (E1527-21, 8.2.3.1, 8.2.3.2).
For a control at the subject property, the answer turns on what the document providing the control requires, what past release it addresses, whether that release was addressed to the applicable regulatory authority's satisfaction with substances left in place, and the property's current condition and use. The standard's definition of a controlled recognized environmental condition rests on the release, the authority's satisfaction and the required controls, and the report identifies the documentation providing the control in its Findings and Opinions (E1527-21, 3.2.17, 3.2.17.1). The standard names no further action letters or like approvals among the documents to review (E1527-21, 3.2.17.1). The control itself is ordinarily in the land title records, sometimes in a registry or only in project documentation (E1527-21, 5.4, 5.5). See activity and use limitations and agency file review. The report states what the file shows on each point, with the professional's opinion on which class of condition, if any, applies (see REC, CREC, HREC or de minimis condition).
For every listing of the subject property or of another site inside the search distance, the report must give the professional's judgment on what the listing means for the analysis of recognized environmental conditions at the subject property, and one statement may cover several sites (E1527-21, 8.1.10).
What the federal rule says
Registries or publicly available lists of institutional controls, including environmental land use restrictions, applicable to the subject property.
40 CFR 312.26(b)(7), edition revised as of July 1, 2025
Paragraph (b)(6) of the same section lists engineering control registries and public lists for the subject property (40 CFR 312.26(b)(6)). For nearby properties, the rule lists engineering control registries at one-half mile (40 CFR 312.26(c)(2)(ii)). The standard's row for federal registries has a scope of the subject property only (E1527-21, Table 2). The rule provides that the standard may be used to comply with 40 CFR 312.23 through 312.31 (40 CFR 312.11(a)).
Where the record is kept
EPA tracks institutional controls at Superfund sites in site documents and IC-tracking data. RCRA controls appear in RCRAInfo and permit files. State registries (a separate ASTM row) cover state-program controls.
This page is general reference for environmental professionals. It does not classify any property. ASTM E1527-21 is the standard and is not reproduced here; the judgment of the environmental professional on the facts governs.
Classifying a finding
Situations in which this record type bears on the answer: