I believe this in the sense that I know what kind of water I know an outdoor operation can use. Like even 5 outdoor plants you could be looking at 10-15 or so gallons a week per plant. So if you're a small time grower in ca and are doing 25-99 plants outside during the summer, your water consumption can really add up. A buddy of mine was in San Bernardino and had a small indoor operation of around 30k watts and it used all his well water up around twice per 3 month cycle and had to buy water which ended up being insanely expensive. And outdoor plants generally get bigger and need more water than their indoor counterparts, so I could maybe halfway believe this. Them and the moonshiners lol, that's who must be using all our water. All 4% of the water used by people other than the government subsidized farmers, who get the other 96%... (I was listening to an article recently that gave these numbers but I think that is what household use of the states water goes like.)