Floor drain, sump or trench drain in the building

The site visit finds a floor drain, a sump or a trench drain inside a building, and nobody present knows where it discharges. The standard makes drains and sumps a feature to look for and gives them no class. Whether there is a recognized environmental condition (REC) depends on four things: what has gone into the drain, where it discharges, what evidence of a release exists, and whether it was closed, and how.

What the answer turns on

What has gone into it. Only hazardous substances and petroleum products count (E1527-21, 3.2.73). The environmental professional considers what releases past uses could have led to; for a likely release, the standard's nonmandatory appendix on the REC definition points to the operations involving those substances, how long they ran and when (E1527-21, 8.3.1, X4.1). Establish what was done in the area each drain serves, now and before. A sump holding liquid likely to be a hazardous substance or petroleum product is a site visit feature of its own (E1527-21, 9.4.14).
Where it discharges. Drains and sumps, liquid discharged from the subject property, dry wells and injection wells, and septic systems are site visit features (E1527-21, 9.4.21, 9.4.26, 9.4.27, 9.4.28). The legal background appendix reports the federal agency's reading that a release not held wholly inside a building or structure is one into the environment (E1527-21, X1.1.1.2). The body of the standard does not say how a discharge to a public sewer is weighed. Establish whether each drain leads to a public sewer, a septic system, a dry well, a holding tank, surface water or the ground.
Evidence of a release. Strong odors and their sources, stains or corrosion on floors, and stained soil or pavement are site visit features (E1527-21, 9.4.13, 9.4.20, 9.4.23). The site visit need not identify conditions under floors, and the practice includes no sampling (E1527-21, 7.4, 9.2.4.2), so the pipe run and the outlet are learned from records and people. A release that is found is weighed against the de minimis definition (E1527-21, 3.2.20): see staining on pavement or soil.
Whether it was closed, and how. A drain that was plugged or reconnected, or a dry well that was closed, is weighed on what the closure records show: a past release addressed to the applicable regulatory authority's satisfaction may be a historical REC or a controlled REC, by whether unrestricted use criteria were met without controls (E1527-21, 3.2.17, 3.2.39). Vermont's agency says closing a floor drain leaves a closure form (Vermont); Maine's says a business that seals its floor drains must notify it in writing (Maine).

The federal injection well rule (40 CFR part 144) names floor drains only in its well closure section (40 CFR 144.89(a)(2)); it reaches one through its outlet, since its wells include a subsurface fluid distribution system, a septic system and a drywell (40 CFR 144.3). Class V takes the injection wells in no other class, dry wells used to inject wastes among its examples; a well receiving fluids that qualify as hazardous waste is Class I or IV (40 CFR 144.6(e), 144.80(e), 144.81(5)). Wells that take fluids from vehicle repair or maintenance carry a prohibition and closure terms of their own (40 CFR 144.81(16), 144.84(b)(2)): see auto repair shop with lifts, floor drains and a separator. Single family residential systems, and non-residential ones used solely for sanitary waste with capacity for fewer than 20 persons a day, are outside the rule; a generator's well that disposes of fluids containing hazardous waste is inside it whatever its capacity, septic systems and cesspools included (40 CFR 144.1(g)(1)(iii), (g)(2)). The rule classifies nothing under the standard.

The records that bear on it

Site visit. Drains and sumps are described in the report, or reported as not found (E1527-21, 9.4, 9.4.21). The interior is observed, maintenance and repair areas and boiler rooms included, and physical constraints on what could be observed are documented (E1527-21, 9.2.3, 9.2.6). In the suggested report format of Appendix X5, the site plan should show sumps, clarifiers and floor drains or trenches (E1527-21, 12.3, X5.12.1).
Interviews. Questions shall try to cover drains and sumps, current and past, and the key site manager is often a property manager or the head of maintenance (E1527-21, 10.2, 10.5.1). Ask where each drain leads, what went into it, and whether it was sealed.
Documents. Before the site visit the owner, key site manager and user are asked for wastewater and underground injection permits and registrations of underground injection systems (E1527-21, 10.8.1). Building department records are reviewed where the professional judges that warranted (E1527-21, 8.3.4.5, 8.3.8).
Agency records. Injection well records are not a standard source (underground injection wells); the standard's examples of sources for additional records include health departments, building permit and inspection departments and water quality agencies (E1527-21, 8.2.4, Table 3).

What the federal rule says

The inquiry rule (40 CFR part 312) does not mention drains. Its on-site visual inspection covers the places where hazardous substances may be, or may once have been, used, stored, handled, treated or disposed of, and it adds:

Physical limitations to the visual inspection must be noted.

40 CFR 312.27(a)(1), edition revised as of July 1, 2025

For a party seeking the liability protections that item stops at hazardous substances; the standard includes petroleum products (E1527-21, 1.1.2).

How it is written up

A drain or sump 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 that such substances left through the drain, or likely did, and are present or likely present at the subject property, the opinion gives the grounds: what went in, from which uses and years, where it leads, 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 concludes otherwise, the opinion gives its reasoning on the same four facts (E1527-21, 12.6). Whether the drain meets the injection well or sewer rules is regulatory compliance, outside the standard's scope unless the user adds it (E1527-21, 13.1.2, 13.1.5.14).

An interview with the key site manager, or observation of the room a drain serves, may be what cannot be had. 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.