The WMA is located five miles west of Napoleonville, with Lake Verret on the western border (as well as the Belle River), farmland to the east, and is managed by the Louisiana Department of Wildlife and Fisheries (LDWF).

Elm Hall WMA is a naturally flooded cypress–tupelo swamp that rises slightly to the east and is within the Atchafalaya Basin.

[1] A study supported by a United States National Science Foundation grant (EAR-1014946 and EAR-1148005) found there is a high concentration of Arsenic in tested groundwater wells in the area of Napoleonville.

[2] A March 15, 2016 sampling of parish supplied water from Bayou Lafourche showed 1.2 parts per billion (ppb) presence of Arsenic.

[4] A 2016 study by Karen H. Johannesson found Arsenic levels at two sites, Bayou Lafourche near Napoleonville and Cow Island in Vermillion Parish, to be "10 times higher than EPA standards of less than 10 parts per billion.