Just to give an approximation for the purposes of visualization: A gallon of water weighs 8.36 pounds and a typical semi-tanker can hold about 6000 gallons of water legal weight for transport.
So after doing the math for 7 million gallons per day that would mean the equivalent of looking at over 1,100 semi tankers of water. Of course they’re not trucking it but it gives you an idea to visualize the magnitude. Every day.
As an example, if you went to park 1,100 semi tankers end to end they would stretch for over 14 miles. Looked at another way, if you jammed them all together with no space between them in the most compact parking area you would need a lot that is almost 4 miles by 4 miles or almost 16 square miles.