Why doesn't everyone in California just urinate on the fires?

I've read the firefighters are struggling to contain the blaze, so I've done the maths.

• The average human produces about 1.5 litres of urine per day
• About 40 million people are living in California
• The wildfires are effecting an area of about 150km²

So that means if everyone just works together, Californians could easily cover the effected area with a thick layer of urine, 0.4mm deep... EVERY DAY. Can someone send this to Arnold?