I was trying to figure out how a datacenter (which doesn't really produce any chemicals) would cause cancer. FTA:
Amazon’s hulking data center, thirsty for water to cool its blazing hot computer chips, supercharged this process, adding millions of gallons of wastewater a year **to the heavy volume of farm runoff, ** which Morrow County was already struggling to keep up with. Soon even the deepest reaches of the local aquifer were tainted, according to RS, as huge volumes of data center and agricultural wastewater saturated the water table.
So the problem is actually farm runoff, but the datacenter evaporation concentrates it. Not quite Amazon's fault for the original contamination, however Amazon could and should absolutely switch to a "Closed Loop" cooling system which would mean the water consumption (used for cooling) would dramatically fall, and this concentration issue of farm pollution would disappear.