Definition
ROD carries two distinct legal meanings that share nothing but the abbreviation.
1. Unit of linear measure. A rod is a traditional unit of length equal to 16.5 feet (5.5 yards, or one-quarter of a chain). Also called a perch or pole. Used historically to describe land dimensions in metes-and-bounds descriptions, survey records, deeds, and statutes dealing with road widths, drainage easements, and setback requirements.
2. Record of Decision (environmental law). In the context of federal Superfund law, a Record of Decision is the formal document through which the U.S. Environmental Protection Agency (EPA) announces and explains its selected cleanup remedy for a contaminated site listed on the National Priorities List (NPL) under CERCLA (the Comprehensive Environmental Response, Compensation, and Liability Act). The ROD is the capstone of the remedial investigation and feasibility study (RI/FS) process and establishes the legally binding cleanup standard for the site.
Common Language
Modern common usage (Wiktionary): A nickname for the male given names Rodney and Roderick; also the ordinary word for a straight slender stick or bar.
Historical common usage (Webster's 1913): A straight and slender stick or wand; an instrument of punishment or correction; a badge of office or authority; also a unit of linear measure of 16.5 feet.
The gap worth noting: The measurement sense in Black's aligns with the older common English usage and is unremarkable. The environmental law abbreviation—by far the more significant legal meaning in contemporary practice—has no relationship to the common word at all. Researchers searching historical property records will encounter rod as a unit of length; researchers working in environmental law will encounter ROD as a document type. The same three letters point to entirely different bodies of law.
Common Confusion
The two legal meanings of ROD are entirely unrelated and are unlikely to be confused by a careful reader, but indexing and search tools may return results from both contexts. A deed reciting a boundary "thirty rods along the creek" and an EPA press release announcing "the ROD for the XYZ Superfund site" are using the same word in completely different registers. Corpus searches on rod or ROD without further filtering will mix land survey materials, environmental agency documents, and biblical/ecclesiastical references to the rod as an instrument of authority.
Why It Matters in Research
For property and survey research: Rod (as a unit) appears constantly in pre-twentieth-century deeds, plats, and land grants. Researchers working with historical metes-and-bounds descriptions must be fluent in the conversion: 1 rod = 16.5 feet; 320 rods = 1 mile; 160 square rods = 1 acre. Failure to convert correctly distorts boundary reconstructions. The term perch is used interchangeably with rod in older sources, particularly in English and colonial-era records; pole appears as well. These three terms are synonyms for the same measurement and should be treated as such across the corpus.
For environmental and regulatory research: The ROD is one of the most consequential documents in federal environmental cleanup practice. It is not merely advisory — it triggers enforceable obligations, allocates cleanup responsibility among potentially responsible parties (PRPs), and establishes the remedial action objectives and cleanup levels that govern subsequent work. Researchers tracing the regulatory history of a Superfund site should locate the ROD as the primary document establishing what was decided and why, distinct from the RI/FS (which informs the decision) and the remedial design/remedial action (RD/RA) documents (which implement it). RODs can be amended through Explanation of Significant Differences (ESD) or a formal ROD Amendment if the selected remedy changes materially.
The abbreviation ROD in environmental law is so entrenched that it appears in agency guidance, consent decrees, and litigation without expansion. Researchers who encounter ROD in a CERCLA context and are unfamiliar with the term's meaning in that field may not immediately recognize it as a formal legal document name.
Historical Dictionary Support
Black's Law Dictionary addresses only the measurement meaning — rod as 16.5 linear feet — and treats it as a synonym for perch. This is accurate and consistent with how the term appears in historical property law, survey statutes, and highway legislation. Historical legal dictionaries were compiled before the modern administrative law usage crystallized, so the Record of Decision sense is absent from traditional shelf sources entirely. Researchers relying solely on Black's or similar historical dictionaries will find no guidance on the environmental law meaning of ROD. The measurement definition, by contrast, is stable across editions and consistent with contemporaneous technical and legal usage.
Jurisdictional Note
The rod as a unit of measure appears in the property and highway laws of all American jurisdictions that used the English system, as well as in English and Commonwealth legal sources. The Record of Decision is a creature of federal law under CERCLA and EPA regulations; state-led cleanups under state superfund or voluntary cleanup programs use analogous decision documents, which may be called by different names depending on the state.
Encyclopedia Cross-Reference
CERCLA Cleanup Process — RI/FS, ROD, and the NCP (The Law Mind Environmental & Energy Law Encyclopedia)