D.C. Mun. Regs. tit. 15, § 4408
4408
BILLING RECORDS
4408.1 All records associated with the computation of charges rendered to tenants for electric service or natural gas service shall be retained for a minimum period of three (3) years.
4408.2 The owner shall maintain and make available for inspection by the tenant, upon request, the following records:
(a) The billing from the utility to the owner for the current month and the thirty-six (36) preceding months;
(b) The calculation of the average cost per energy unit for the current month and the thirty-six (36) preceding months; and
(b) The tenant's submeter or energy allocation readings and billings for the current month and the thirty-six (36) preceding months or for the term of tenancy, whichever is less.
Source: Notice of Final Rulemaking published at 58 DCR 9521, 9533 (November 11, 2011); as corrected by an Errata Notice published at 58 DCR 9829 (November 18, 2011).