> Wells might not work beyond a certain population density due to insufficient groundwater recharge rate.

Isn't agricultural irrigation the largest source of groundwater depletion in places where it's an issue?

I believe basically all water here in Iowa is pulled from groundwater wells. I've never heard of it being something anyone was worried, but we also don't irrigate fields like they do in the Western states.

The main issue I hear about is people worrying about farm chemical runoff getting into the aquifers.