D.C. Mun. Regs. tit. 30, r. 30-907
The Agency shall pay in prizes at least fifty percent (50%) of each week's POWERBALL® sales from all tickets and shall allocate that amount to the winning pool or pools for payment of prizes for that game.
The prize money allocated to the Grand Prize category shall be awarded equally to the number of game boards winning a Grand Prize.
If in any game drawing there are no plays that qualify for the prize, the prize money for that game drawing shall be added to the prize pool.
Any amount remaining in the prize pool at the end of this game shall be returned to all lotteries participating in the prize pool after the end of all claim periods of all selling lotteries, carried forward to a replacement game or expended in a manner as directed by the Executive Director in accordance with District law.
An amount up to five percent (5%) of a Party Lottery's sales, including any specific statutorily mandated tax of a Party Lottery to be included in the price of a play, shall be deducted from a Party Lottery's Grand Prize Pool contribution and placed in trust in one or more Powerball prize pool accounts and prize reserve accounts held by the Product Group at any time that the prize pool accounts and Party Lottery's share of the prize reserve account(s) is below the amounts designated by the Product Group.
The Product Group has established the following prize reserve accounts for the Powerball game: the Powerball Prize Reserve Account (PRA), which is used to guarantee the payment of valid, but unanticipated, Grand Prize claims that may result from a system error or other reason; and the Powerball Set Prize Reserve Account (SPRA), which is used to fund deficiencies in low-tier Powerball prize payments (subject to the limitations of these rules).
D.C. Mun. Regs. tit. 30, r. 30-907