(c) A landlord may charge a tenant of a dwelling unit for water usage as measured through the use of submetering equipment only in accordance with this section and only upon the landlord certifying that the dwelling unit is in compliance with this section to a board of health, health department or other municipal agency or department charged with enforcement of the state sanitary code. All provisions of this section allowing landlords to charge tenants for water usage shall also be deemed to apply to sewer service charges calculated by means of the same primary meter or submeter. Certification by the landlord shall be provided under the penalties of perjury and shall include a statement that: 1) the dwelling unit is eligible for the imposition on the tenant of a charge for water usage in accordance with paragraph (d); 2) all showerheads, faucets, and water closets in the dwelling unit are water conservation devices and that all water closets were installed by a licensed plumber; and 3) the water submeter measuring the use of water in the dwelling unit was installed by a licensed plumber and is in compliance with the standards of accuracy and testing referenced in subsection (b).