Seattle, WA Excavation Contractor


(206) 855-5171

Seattle Underground Utilities Contractor

Underground utility construction and maintenance.


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(206) 855-5171

Utility Contractor


Whether you are extending water lines or installing a septic tank, Rainstate Earthworks experienced team of utility experts can get the job done efficiently and safely. Careless digging can damage underground utilities, causing property damage and termination of services. Worse, it can cause injury. Since excavation damage is the leading cause of serious natural gas pipeline incidents, it’s crucial you choose reliable experts who take the proper steps to avoid damage and prevent expensive repairs and project delays.

Rainstate Earthworks is an industry leader in underground utility construction and maintenance. We work directly with clients and builders on all types of commercial and residential properties. Relying on detailed blueprints and following all applicable industry guidelines and permits, we complete the job on time with excellent workmanship.

We offer a wide variety of services that includes:

Sewer Line Extension

Sewer excavation is not a task for just anyone – it’s a complex process that requires significant expertise in equipment handling, sewer line safety protocols, and much more. With a fatality rate 112% higher than that of general construction, excavation work should be left to the pros and planned ahead. At Rainstate Earthwork, we’re a local Washington excavation company with years of sewer excavation, replacement, installation, and repair experience. We will:

  • Evaluate and inspect soil for excavation and sewer line placement
  • Locate underground utilities such as natural gas lines
  • Test for low oxygen, hazardous fumes, and toxic gases in the excavation area
  • Construct adequate systems with safety in mind

Sewer excavation and installation should never be a DIY project – give us a call if your property is in needed of a sewer line extension. If you’re not sure where to start, we can help!

Septic Systems

With many years of experience in septic installation, septic repair, and septic replacement, we know how to find solutions to every septic need you may have. Whether you are a homeowner or run a business in Seattle, we can evaluate your septic system requirements, engineer, and design the best system, and provide complete oversight during the entire process.

Contact us before beginning your project! Replacing septic systems can cost tens of thousands of dollars, but with the right experts, you can stop your septic system from failing before it starts.

Seattle Underground Utilities Contractor
Digging electrical ditches for a new elementary school in Auburn, WA.

Main Utility Connection

Digging for for main utility connections in Seattle, WA

Electrical Ditches

Digging electrical ditches for a new elementary school in Auburn, WA.