Earthworms can accumulate mercury when grown in mercury contaminated soil (Ernst and Frey, 2007). This study was undertaken to determine if there is a correlation between the whole body concentration of mercury in the earthworm, Lumbricus terresteris, and the amount of metal in the worm's environment. Earthworms were grown in 1.38*10^-2 m³ of soil. Worms grown in soil having the local background concentration of 0.031 µg of mercury per g of soil had a body concentration of 0.049 ± 0.015(mean ± standard deviation) µg of mercury per g of freeze-dried tissue. Worms grown in soil from a contaminated site having a soil mercury concentration of 0.524 µg/g had a tissue concentration of 0.244 ± 0.196 µg/g. The Mann-Whitney test was used to determine if the medians of these two groups differed significantly. This test produced a two-tailed P value of <0.0001. Samples were analyzed for total mercury using USEPA Method 245.1, Manual Cold Vapor Atomic Absorption Spectrophotometry.