It's true that Arizona is going to be hurting. Even the wells in some mountain communities are drying up. Water is the number one concern is most western states. That's because of drought.
Texas is beginning to see water insecurity but not as bad as further west.
Part of that is exacerbated by the periodic droughts, but there are also more fundamental factors.
A lot of Texas relies on it's water from the underground aquifers. Those took tens of thousands of years to fill during previous ice ages. They have been drained at an alarming rate over the last 100 years. At a rate that can't be hoped to be replenished. Rural wells needing to be drilled deeper and deeper or abandoned are becoming more common in central north Texas. That will only get worse with continued population growth.
On my land, I decided not to bother with a well. I use rain water harvesting and cistern storage. You just need to size your storage to collect enough during the rain season to get you through the dry season. But I can manage and ration my own water use. I have control over that. Drilling into an aquifer is becoming dependent on a shared resource where I can't control how others waste it. Like pouring it on cantaloups being grown in the desert around San Antonio. Some day, if big AG is force to pay the true cost of it's water usage it might rethink growing cantaloups in the desert. And don't get me started on manicured lawns or using purified drinking water to flush our toilets.
Before 1900 and the improvements in drilling tech and electrification to run pumps 24/7, rainwater harvesting and cisterns were the norm in vast swaths of rural Texas.
You'd be amazed at how much water comes off a average sized house from a 1" rain shower. A 2000 sqft house roof will harvest around 1240 gal from a single 1" shower.
