Section 62.2150 - Identification of plan-negative declaration(a) Letter from the Department of Health, Environmental Health Administration, submitted to EPA on June 25, 1999, certifying that there are no known existing HMIWI units in the District of Columbia.(b) Letter from the District Department of the Environment, submitted to EPA on July 26, 2012, certifying that there are no known existing HMIWI units in the District of Columbia. 68 FR 53 , Jan. 2, 2003, as amended at 78 FR 40017 , July 3, 2013