San Marcos, California Drillers and Service Providers

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Locate top-notch water well drillers, groundwater, and drought information in san marcos, California. Whether you need a new well, repairs, or regular maintenance, find experts through our listings.

Interactive Water Well Map – Estimate your new well's depth

Visit the San Marcos Water Well Map to view the water, irrigation, and geothermal wells.

Water Well Professionals in San Marcos, California – Water Well Drilling, Service, and Treatment

Johnson Pump Service
Aim Pump Service
4279 Bonita Dr
Scott's Drilling Services
271 Roymar Rd
Fain Drilling & Pump Company Inc.
12029 Old Castle Rd
Aspin Well Drilling
1315 Walnut St
PumpMan Water Well SD - Ransom Pump
Ramona Pump & Supply
27312 Sawday Truck Trl
Water Wise Well Service
1444 Main St
Booth's Pump Services
Hydro-Tech Well Services
1672 Main St
Perry Plumbing & Pipelining
100 W 35th St
Pacific Drilling
5220 Anna Ave
CUTTING EDGE RESTORATION, INC of SAN DIEGO
2222 Verus St
Southern California Well Service
11998 Stoney Peak Dr
Tri County Drilling Inc
9631 Candida St
Go Plumbing and More
790 Kostner Dr
A Pro Plumbing
3268 Carnell Ave
Medina's Plumbing & Drain
4702 Carbine Way
Specialized Drilling Corp.
8534 Siempre Viva Rd

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Water Well Terminology

Drop PipeThe pipe that extends from the wellhead to the pump in a well.

Learn about more terms in the glossary.

San Marcos Statistics

Geology
AquifierOther rocks
Rock FormationUnknown
Well Information*
Well Depth204 (ft)
SWL52 (ft)
Bedrock Depth-- (ft)
Yield145 (gpm)
* Average within 5km
Drought Monitor
July 8, 2025D2 
July 1, 2025D2 
June 24, 2025D2 
June 17, 2025D2 
June 10, 2025D2 
June 3, 2025D2 
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May 20, 2025D2