"Under Stage Four guidelines, just like in Stage Three, the first 12 hundred cubic feet (ccf) or 8,977 gallons of water used by residential customers will not be subjected to any surcharges. All water consumption billed above 12 ccf will be charged the normal rate for all water used; however, they will be billed an additional surcharge of 400% per ccf on top of the normal rate for all water used above 12 ccf," the BWWB said.