There are around 6 billion humans, so this would make the total water consumption equal to around 16 times the human population.
I started out writing this post on how this number is way too low, but it's actually more reasonable than you might think. I do think it's off by an order of magnitude (but I thought it was off by at least 5).
Assume water consumption is roughly proportional to mass. The rest is based on wiki Biomass article. From the "domestic biomass = 700 mill tonnes = 1% of earths biomass" estimate a total biomass of 7*10^10 tonnes. Say a third of that is from animals (there are a lot of small critters in the sea, so maybe), so we have around 2*10^10 tonnes animal biomass. 6 billion humans = 1*10^8 tonnes biomass, so we're talking the equivalent of 1200 billion humans, ie, around 10 times your estimate.
So that would make the two quantities even closer.