Onsite Wastewater Services

LeRoy Surveyors & Engineers, Inc. (LS&E) provides wastewater services—including residential and commercial design—to municipalities, developers, school districts, retail centers, consultants and contractors in the Pacific Northwest.

As a large, full-service civil engineering and development services firm, we’re capable of handling a full range of wastewater projects. Our staff has expertise from small residential septic to large commercial systems.

LS&E is the first choice for difficult or specialized jobs that present unique wastewater conditions. Our team can design from ground-up or modify existing structures to address challenges such as lack of space, lopsided flows, high output, sensitive environmental conditions, aging structures and the need for pre-treatment.

We support all phases of construction—from initial design to in-progress evaluations to project completion. LS&E team members have extensive wastewater experience and are committed to providing you cost-effective, functional and innovative solutions.


  • Site Feasibility Studies
  • Soil Characterization
  • Method II Analysis
  • Individual Septic Designs (Commercial and Residential)
  • Community Septic Systems Design (Local or State Level)
  • Enhanced Treatment Designs
  • Sand Filter Designs
  • Mound Systems Design
  • Individual Well and Septic Systems
  • Subsurface Septic Disposal Systems
  • Permitting Assistance



Since 2007, Bill Creveling, L.G., has led our wastewater and geotechnical engineering services. Bill previously worked at the Tacoma-Pierce County Health Department, where he spent 20 years reviewing and consulting on project design and construction. His experience with subdivisions, commercial developments, wastewater systems, easements and public utility projects allows LeRoy’s to service both municipal and private development projects.

Bill obtained a Bachelor of Science in Geology at Fort Lewis College in Durango, CO. He maintains his expertise with extensive continuing education in geology, construction, wastewater technology and soil science. Please contract Bill at (253) 848-6608 ext. 103, or by email at BCreveling@lseinc.com.

Qualifications & Experience

  • Licensed Geologist
  • Licensed On-Site Wastewater Treatment Systems Inspector
  • Board Member—Washington On-Site Sewage Association
  • 2014 President – Washington On-Site Sewage Association
  • Tacoma-Pierce County Health Department
    • On-Site Wastewater Program Field Lead
    • Land Use Program Lead
    • Industry Support Group Facilitator
    • National On-Site Wastewater Demonstration Project Coordinator