D.C. Mun. Regs. tit. 31, r. 31-1309
A licensee shall file with the Commission a schedule of current fees for all services related to the sale, repair, installation and calibration of taximeters, including, but not limited to, inspections, tests, adjustments, installations, corrections, or repairs.
Any change in fees shall be filed with the Commission at least ten (10) days prior to the scheduled date of said change in fees.
A taximeter business owner shall not engage in any business unless a current schedule of inspection and repair charges, including hourly rates, if applicable, is prominently displayed to the public on the business premises.
A taximeter business owner shall not publicly display any fee schedule until after it has been filed with the Commission.
D.C. Mun. Regs. tit. 31, r. 31-1309