From the article:<p>&gt;That&#x27;s already in the works at LADWP, which could go from a two-tier system to four tiers. Marty Adams of the DWP told me that in the case of the highest user in Bel-Air, the $90,000 annual cost of water would rise to about $125,000.<p>Instead of tiered, there could be a progressive multiplier, e.g. a multiplier equal to the gallons used: 1 gallon = $1 ; 10 gallons = $100; 100 gallons = $10,000.