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It also drastically accelerated the rate that those nitrates entered the aquifer. Amazon pulled in and spit out tens of millions of gallons of water which forced the nitrates deeper and deeper into the earth until they contaminated the water source. Then amazon was pulling in contaminated water, concentrating the nitrates, and then spitting that out too pushing that even more polluted water into the earth.

The total amount of nitrates is basically the same. Where those nitrates ended up and at what concentrations is what changed once amazon came into the picture. People had clean drinkable water before amazon's data center. They'd have had to deal with the soil contamination eventually, but by forcing the pollution into their clean water supply and increasing the concentration of it amazon's data center made their water undrinkable.