From sewer mains and septic systems to water lines and stormwater management — Acosta & Sons delivers quality underground utility work across Southern California since 1971.
From residential septic systems to large-scale municipal wet utility construction — we handle every scope with precision and 50+ years of expertise.
Complete sewer main installation, lateral connections, and manhole construction for residential, commercial, and municipal projects across Southern California.
Full-service septic solutions including design, installation, repair, inspection, pumping, and maintenance. Authorized installers of Microseptec, Jet, AquaKlear, and Microfast systems.
Installation and repair of potable water lines, fire lines, and service connections. Ensuring reliable water delivery for every type of property.
Design and installation of drainage systems, stormwater capture, retention basins, and best management practices (BMPs) for code-compliant drainage solutions.
Specialized sewer line installations for Accessory Dwelling Units (ADUs). We handle permitting, excavation, and connection to bring your ADU into full compliance.
Precision excavation, utility trenching, site grading, and debris removal. Our experienced operators ensure safe, efficient excavation work on every project.
We don't just dig trenches — we build lasting infrastructure that communities depend on. Here's what sets Acosta & Sons apart.
C-12 (Earthwork), C-42 (Sanitation), and A-General Engineering — we hold every license needed for your most complex projects.
From a homeowner's septic system to a city-contracted sewer main — our team scales to match your project's scope and deadline.
Clients call us quick, affordable, and patient. We explain everything step-by-step — you'll never feel rushed or surprised by the bill.
We came out the same day and walked our clients through a difficult process — that's been our standard since 1971.
Our credentials aren't just paperwork — they represent 50+ years of demonstrated excellence and compliance with California's strictest standards.
Earthwork & Paving — excavation, grading, and all underground utility site preparation work.
Sanitation System — sewer mains, laterals, septic, and all sanitation infrastructure projects.
The highest-level CA contractor license — qualifying us for large-scale public works and municipal projects.
Comprehensive liability and workers' compensation insurance — protecting your project and property at every stage.
Our proven process keeps your project on schedule, on budget, and fully compliant — every time.
Call or submit your project details. We respond same day and can visit your site for a full assessment.
Receive a comprehensive written quote with scope, timeline, and pricing — fully transparent, no surprises.
We handle all permitting and utility coordination. You focus on your project — we handle the paperwork.
Work is completed to spec, inspected, and signed off. Site is cleaned and you receive full documentation.
Our crews are based in Sun Valley and reach every corner of the 5-county SoCal region. No project is too far or too complex.
We've built our reputation one project at a time — here's what homeowners and contractors say about working with Acosta & Sons.
"Quick, affordable, and patient — they came out the same day and walked us through a difficult process step by step. I never felt pushed or rushed. Acosta & Sons are truly the best in the business."
"Had them install a new sewer lateral for our ADU project. The team was incredibly professional — pulled permits, coordinated with the city inspector, and had everything signed off on schedule. Highly recommend."
"We've used Acosta & Sons on three commercial projects now. Always on time, always polite, and their pricing is more than fair for the quality of work. Our go-to sewer contractor in LA County without question."
Whether you're a homeowner needing a septic inspection or a developer planning a full sewer main — we want to hear about your project.