Maryland Code, Environment § 9-281

(b)(1) “Coal combustion by-products” means the residue generated by, or resulting from, the burning of coal.

(2) “Coal combustion by-products” includes fly ash, bottom ash, boiler slag, pozzolan, and other solid residuals removed by air pollution control devices from the flue gas and combustion chambers of coal-burning furnaces and boilers, including flue gas desulfurization sludge and other solid residuals recovered from flue gas by wet or dry methods.

(d)(1) “Generator” means a person whose operations, activities, processes, or actions create coal combustion by-products.

(2) “Generator” does not include a person who only generates coal combustion by-products by burning coal at a private residence.