Most of the wells they sampled are > 100 ft above the water table. Some are as low as 12. The lowest is 2.83ft. Here's the relevant bit of the schema XML document for the CSV the produced:
<attr>
<attrlabl>DTW23</attrlabl>
<attrdef>
December 2022 through March 2023 depth to groundwater in feet measured
from land-surface elevation referenced to NAVD 88
</attrdef>
<attrdefs>U.S. Geological Survey</attrdefs>
<attrdomv>
<rdom>
<rdommin>2.83</rdommin>
<rdommax>453.97</rdommax>
<attrunit>feet</attrunit>
</rdom>
</attrdomv>
</attr>
I used to live in a neighboring parish to the west of New Orleans. If you dug more than 3 feet into the ground, you were hitting water. Driving pilings is a sloppy mess.
https://www.sciencebase.gov/catalog/item/64650dded34ec179a83...
Most of the wells they sampled are > 100 ft above the water table. Some are as low as 12. The lowest is 2.83ft. Here's the relevant bit of the schema XML document for the CSV the produced: