[1] Groundwater in the San Joaquin Valley occurs mostly in younger alluvial material.
Groundwater in the Turlock Basin occurs in older alluvial deposits.
[4] Potential areas of concern: The City of Turlock receives its entire water supply for domestic use from groundwater.
The character of the water is generally a sodium sulfate type,[6] and some local wells have been historically closed due to DBCP pesticide poisoning.
In an area that relies on groundwater for essential needs it greatly diminishes the supply with contaminants present.