Eight soil samples from each of 30 houses in greater New Orleans, Louisiana were collected in October, 1986 and analyzed for chlordane residues (ppm). All houses had reportedly been treated in the late 1960's or early 1970's. Chlordane occurred in all samples, and the overall mean (+ SEM) was 870.6 + 96.5 ppm. Residue levels were unaffected by construction type (slab, crawl, crawl/slab) or depth of sampling (0-5 cm or 6-10 cm). Considerable within-house variability of residues occurred, but crawl space structures were less variable than were slab structures. Low residues at 17 sampling sites were potentially inadequate to deter the introduced Formosan subterranean termite, Coptotermes formosanus Shiraki.

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