Septic System & Drainage Contractor
Professional septic excavation, drainage installation, and erosion control solutions for residential and rural properties throughout Los Gatos and the Santa Cruz Mountains
Service Overview
Septic & Drainage Solutions for Long-Term Performance
Mountain and foothill properties in the Santa Cruz Mountains present some of the most demanding conditions for septic installation in California. Steep grades, rock layers, clay soils, limited parcel size, sensitive habitat proximity, and complex county permitting requirements all add up to jobs that require specialized expertise.
CStille has successfully excavated septic systems and leach fields on properties throughout the Santa Cruz Mountains where other contractors estimated the job as infeasible or prohibitively expensive. One of our most frequently cited testimonials is from a Los Gatos landowner whose leach field required steep slope excavation that multiple contractors turned down — and Chris got it done.
What our Service Include
- New septic tank & leach field excavation
- Steep-slope septic excavation
- French drain & subsurface drainage
- Leach field expansion & replacement
- Trench excavation for laterals
- Erosion control integrated into every project
The CStille Advantage
Why Property Owners Choose CStille Excavation
For over 30 years, CStille Excavation has delivered reliable excavation solutions, quality workmanship, and dependable service throughout Los Gatos, the Santa Cruz Mountains, and the Greater Bay Area.
30+ Years of Expertise
Trusted excavation expertise across California's most demanding terrain.
Cal Fire Approved Contractor
Specialized wildfire mitigation and defensible space services.
On Time, On Budget, Every Time
Efficient project delivery through a dedicated fleet and strong supplier partnerships, reducing delays and unexpected costs.
Quality-Focused Results
Every project is completed with safety, durability, and long-term performance in mind.
Service Areas
Serving the Bay Area & Beyond
Based in Los Gatos, CA, CStille Excavation provides specialized civil earthworks to homeowners, landowners, and agricultural estates throughout Santa Clara County, Santa Cruz County, and the broader Bay Area region.
- Los Gatos
- Santa Cruz
- San Jose
- Saratoga
- Campbell
- Morgan Hill
- Scotts Valley
- Gilroy
- Soquel
- + Many More
Call to Inquire About your Area
FAQs
Frequently Asked Questions
Common questions about our Septic Systems and Drainage services, process, service areas, and licensing. Have more questions? Give us a call or send us a message.
Do you work alongside septic system designers and engineers?
Yes — we excavate to the designer’s spec and coordinate directly with county environmental health for approval. We don’t design systems, we build them.
Can you excavate for a septic system on a steep hillside lot?
Yes — that’s a regular part of our work. We check grade, soil, and equipment access on the site visit before quoting.
How does drainage affect my septic system in the mountains?
Poor surface drainage is one of the most common causes of leach field saturation and early failure. We grade drainage into the excavation itself, not as a separate step.
How much does septic excavation cost?
Excavation alone for a septic system typically runs $1,500 to $6,300, depending on soil, depth, and access — separate from tank, materials, and design costs. Hillside lots with rock or limited access usually land toward the higher end. We quote after reviewing your designer’s plan and walking the site.
How long does septic excavation take?
A standard tank and leach field excavation typically takes one to three days once the design is approved and permits are in hand. Steep terrain or rock conditions can extend that.
Ready to Start Your Project?
Bay Area’s most trusted excavation contractor for over 30 years. Call Chris directly or request a free, no-obligation estimate — fast response guaranteed.