Depending on what you define as water cooling, Google most definitely uses watercooling in all their datacenters. https://www.datacenterknowledge.com/archives/

Depending on what you define as water cooling, Google most definitely uses watercooling in all their datacenters. https://www.datacenterknowledge.com/archives/2012/10/17/how-google-cools-its-armada-of-servers https://www.datacenterknowledge.com/archives/2012/10/17/how-... https://arstechnica.com/tech-policy/2012/03/google-flushes-heat-from-data-center-with-toilet-water/ https://arstechnica.com/tech-policy/2012/03/google-flushes-h...