Stressed vegetation on the subject property

The site visit finds dead, discolored or dying plants on part of the subject property. The standard makes stressed vegetation a thing to look for and gives it no class. Whether there is a recognized environmental condition (REC) depends on four things: whether something other than a lack of water is the cause, what stands or stood at or above the spot, whether a fertilizer or pesticide application explains it, and how far it reaches against the de minimis tests.

What the answer turns on

Whether something other than a lack of water is the cause. A REC needs hazardous substances or petroleum products, and a release, a likely release or a material threat of one (E1527-21, 3.2.73). The site visit item covers vegetation stressed by something other than insufficient water (E1527-21, 9.4.24). The practice includes no sampling (E1527-21, 7.4). The standard's nonmandatory appendix on the REC definition says release is not meant to cover most naturally occurring conditions, and gives heavy metals as its example (E1527-21, X4.1). Ask about watering, spills, discharges and applications at the spot (E1527-21, 10.2).
What stands or stood at or above it. That appendix's examples of observations that could be direct evidence of a release include liquid pooled around a drum storage area, with stressed vegetation (E1527-21, X4.1). In its dealership illustration, staining from a former drum storage area runs onto grass with blackened soil and stressed vegetation (E1527-21, X4.3). Distressed vegetation is also among the evidence the standard names for judging what a pit, pond or lagoon likely holds (E1527-21, 3.2.64). Establish what is or was beside or above the spot: containers, tanks, a pit or pond, a drain outlet, a discharge, an adjoining use (E1527-21, 9.2.5, 9.4.12, 9.4.15, 9.4.22, 9.4.26). The federal generator rule (40 CFR part 262) uses the same sign for its own purpose: as a condition of accumulating hazardous waste in tanks without a permit, a small quantity generator inspects the area around the tanks' discharge confinement structures, such as dikes, at least weekly for "obvious signs of leakage (e.g., wet spots or dead vegetation)" (40 CFR 262.16(b)(3)(iii)(E)). That rule classifies nothing under the standard.
Whether a fertilizer or pesticide application explains it. Release has the federal cleanup statute's meaning, and the standard notes that statutory exclusions such as the normal application of fertilizer may affect the professional's opinions and conclusions (E1527-21, 3.2.75). The legal background appendix reports that, by its legislative history, the exclusion was meant for putting fertilizer on crops or cropland, not for dumping or spilling it elsewhere or in amounts well beyond what benefits crops, and may not reach spillage or improper storage (E1527-21, X1.1.1.2). It describes a separate bar on recovering response costs that result from applying a registered pesticide according to its label, which courts have construed narrowly and held not to reach pesticide disposal, storage, spills or transport (E1527-21, X1.1.4.3). The body of the standard does not say how either weighs on a REC: see former orchard or farm.
How far it reaches, against the de minimis tests. Establish the size of the stressed area and whether stained soil or pavement goes with it (E1527-21, 9.4.23). A release that is found is weighed against the de minimis definition, whose tests are that the condition generally poses no threat to health or the environment and generally would not draw enforcement (E1527-21, 3.2.20). In the dealership illustration the professional expected the regulators to enforce a state spill response rule (E1527-21, X4.3). See staining on pavement or soil.

The records that bear on it

Site visit. Stressed vegetation is described in the report, or reported as not found, and photographs of what indicates a REC or a de minimis condition are included (E1527-21, 9.4, 9.4.24, 12.3). Adjoining properties and the periphery of the subject property are observed, and constraints such as snow are documented (E1527-21, 9.2.2, 9.2.5, 9.2.6).
Historical sources. Aerial photographs, fire insurance maps, street directories and historical topographic maps are reviewed where the professional judges them applicable, likely to be useful and reasonably ascertainable (E1527-21, 8.3.8). Look in them for what stood at or above the spot.
Interviews and documents. Questions shall try to cover stressed vegetation, current and past, and the owner, key site manager and user are asked for spill prevention, countermeasure and control plans and for reports of any cleanup (E1527-21, 10.2, 10.8.1).
Government records. The required minimum search for federal release reports covers the subject property, and state spill records can be additional records (E1527-21, 8.2.2, Table 2, 8.2.4).

What the federal rule says

The inquiry rule (40 CFR part 312) never mentions vegetation. Those to whom the rule applies, and the environmental professionals inquiring for them,

must take into account the information collected under § 312.23 through 312.30 in considering the degree of obviousness of the presence of releases or threatened releases at the subject property.

40 CFR 312.31(a), edition revised as of July 1, 2025

For a party seeking the liability protections that rule's subject is hazardous substances (40 CFR 312.1(c)(1)); the standard includes petroleum products (E1527-21, 1.1.2).

How it is written up

Stressed vegetation is a finding when the professional judges it may indicate hazardous substances or petroleum products present or likely present at the subject property (E1527-21, 12.5).

Where the professional concludes a release, or a likely release, has left such substances present or likely present at the subject property, the opinion gives the grounds: the area, its likely source, its extent and the evidence. Unless judged a de minimis condition or a historical REC, the REC is listed in the Conclusions, and the professional should give an opinion on additional investigation, if any (E1527-21, 3.2.20, 3.2.39, 12.7, 12.8).

Where the professional judges both de minimis tests met, the opinion says why; the Conclusions list RECs, controlled RECs and significant data gaps, so a de minimis condition need not appear in them (E1527-21, 3.2.20, 12.7).

Where the professional concludes that something other than a release stressed the plants, the opinion gives its reasoning on the same four facts, and the report still describes what was seen (E1527-21, 9.4, 12.6).

Ground under snow, or a part of the subject property the site visit could not reach, may be what could not be observed. Required information that good faith efforts could not obtain is a data gap, significant if it affects the ability to identify a REC: named in the Findings with the sources consulted, discussed in the Opinions and listed in the Conclusions (E1527-21, 3.2.19, 3.2.78, 12.5.1, 12.6.2, 12.7).

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.