What’s under Stockton
Stockton sits on hundreds of feet of river-laid sand, gravel and clay, the alluvial aquifers that private wells draw from. Far below, about 300 meters down, the volcanic Mehrten Formation separates that fresh water from older marine sediments that tend to hold salty water. In the U.S. Geological Survey’s 2019 sampling of domestic wells around Stockton, well depths ranged from about 60 to 475 feet, with a median around 260 feet.
The water quality picture
Earlier USGS studies found elevated arsenic in public-supply wells along a northwest-trending band that follows the San Joaquin River through the Stockton area. Across the wider study area, about 9 percent of domestic groundwater had arsenic above the drinking-water limit, about 11 percent had high nitrate, and about 13 percent had high iron or manganese. Those are area-wide numbers, not a forecast for your well, which is exactly why a lab test matters.
Permits and the groundwater plan
In San Joaquin County, a permit from Environmental Health is required before a well is drilled, repaired or destroyed, and before a pump is repaired, replaced or installed. If a pump has to go in as an emergency repair, the application has to follow within 48 hours. The Eastern San Joaquin subbasin is one of the basins the state lists as critically overdrafted, and its groundwater sustainability plan was approved by the state in 2023.
The jobs we see most
Pumps that quit on a summer evening, pressure tanks that have lost their air, burned pressure switches, split lines between the well and the house, and older systems on ag-residential parcels that need a proper rebuild. When a well can’t keep up, we can talk through deepening or replacing it under permit.
What we do in Stockton
Well services in Stockton.
Well pump repair & replacement
Submersible and jet pumps diagnosed, pulled, repaired or replaced, sized to your well and your use.
Pump electrical & controls
Pressure switches, control boxes, breakers, wiring and constant-pressure controllers.
Pressure tanks & water systems
Pressure tanks checked, recharged or replaced to stop short cycling and protect the pump.
Well & pipe repair
Leaking lines, worn drop pipe, wellhead and casing problems, and system rebuilds.
Water treatment systems
Treatment matched to what a lab test actually finds in your water.
Well drilling & well destruction
New and replacement water wells, and proper destruction of old ones, under county permit.
Stockton questions
Asked and answered.
Do I need a permit to replace a well pump in Stockton?
Yes, in unincorporated San Joaquin County a well permit is required before repairing, replacing or installing a pump, not just for drilling. For an emergency pump repair, the county allows the work to go first with the application submitted within 48 hours. We handle that paperwork as part of the job.
Is arsenic a problem in Stockton-area wells?
It can be. USGS studies found elevated arsenic along a band following the San Joaquin River through the Stockton area, and about 9 percent of domestic groundwater in the wider area was above the arsenic limit. Many wells test fine. The only way to know about yours is a lab test for arsenic along with nitrate and bacteria.
How deep are private wells around Stockton?
Domestic wells sampled by the USGS around Stockton ranged from about 60 to 475 feet deep, with a median around 260 feet. Your well’s depth, and how far the water level sits below the surface in a dry year, decide how deep the pump has to be set and what size it should be.
Nearby
We also serve
No water? Check the well pump’s breaker. If it trips again, leave it off and call. Never open the pressure switch, control box or wellhead wiring: they’re live at 240 volts. Water suddenly changed color, smell or taste, or the well flooded? Don’t drink it until it’s tested; use bottled water. Smell gas? Leave the building and call the gas utility or 911 from outside.