Citations? Here're mine:
USA uses about 1500 m3/capita/year, which is similar to New Zealand (1200 m3/capita/year) and Canada (1400 m3/capita/year). Compare with California alone, we're at 178 gallons/capita/day which is 245 m3/capita/year. That's lower than most countries.
Your 1st link is total consumption. Agricultural + municipal + industrial.
In your 2nd link, the "178 gallons/day" figure is for municipal use only.
Pro-tip: when you get such massive discrepancies (1 to 6 !) between two similar populations, especially when one includes the other, it's worth checking it up a bit more carefully.