Septic Design & Consulting in Clark Count

Professional septic design and consulting services in Clark County, WA. We provide expert solutions for site evaluations, perc testing, and system design across Vancouver, Battle Ground, Ridgefield, and surrounding areas.

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Septic Design & Consulting Services in Clark County


When you’re planning a property project in Clark County, septic design is a crucial step. At McNair Septic Design & Consulting, we specialize in handling every detail of septic system design, from soils evaluation to final approval. Whether you live in Vancouver, Battle Ground, Ridgefield, or rural Clark County, our team has the expertise to design a system that’s cost-effective, reliable, and county-approved.


We’ve been designing septic systems in Washington since the 1970s, building three generations of knowledge into every project. Our team provides thorough site and soil evaluations, ensuring your septic system is designed specifically for your property’s layout and long-term plans. We also handle all the paperwork, permits, and county communications, removing the stress and saving you valuable time.


Unlike contractors tied to specific system brands, we remain independent—designing systems based solely on your property’s needs. This means you’ll receive the best possible solution, whether it’s a simple gravity system or a more advanced sand filter, mound, or aerobic setup. With fast turnaround times, transparent updates, and proven experience, McNair Septic is Clark County’s trusted partner in septic design and consulting.


Our clients appreciate our attention to detail and personal approach. From your initial consultation through final county approval, we’re committed to delivering a smooth, stress-free process. With a 4.9-star reputation and hundreds of happy homeowners, we take pride in designing systems that stand the test of time.

McNair Septic Blogs

Septic system installation in a yard with a house in the background.
September 30, 2025
Need a septic drain field in Clark County? McNair Septic provides soil testing, custom designs, and full permitting support. Trusted since the 1970s with 4.9★ reviews and decades of local expertise.
Septic system installation: excavated ground, concrete tanks, green pipes and covers.
September 30, 2025
Need septic system design in Clark County? McNair Septic handles soil testing, permits, and custom designs for gravity, aerobic, and drain field systems. Trusted since the 1970s with 4.9★ reviews.
Green field with several piles of dirt, person in the middle. Forest and buildings in the background, blue sky.
September 30, 2025
Need perc testing in Clark County? McNair Septic provides expert percolation tests, soil evaluations, and septic system designs. Trusted since the 1970s with 4.9★ reviews.
Green septic tank lids on concrete slabs in a dirt construction site.
September 30, 2025
Need a septic solution for tricky soils or uneven land? McNair Septic designs custom aerobic septic systems in Clark County. Eco-friendly, efficient, and permit-ready in just 14 days.
Septic system installation in dirt, with green lids, pipes, and trench lines in a wooded area.
September 30, 2025
McNair Septic designs trusted gravity septic systems in Clark County. With 50+ years of experience, we deliver cost-effective, low-maintenance designs and handle all county permitting.
A septic system being installed in a yard with a new house in the background, visible pipes and dirt.
September 30, 2025
McNair Septic provides professional septic tank design in Clark County. With 50+ years of experience, we deliver tailored, code-compliant systems and handle permitting from start to finish.
Construction site: Septic tank installation, with tanks, piping, and dirt.
September 23, 2025
Need septic system design in Clark County? McNair Septic Design & Consulting handles permits, inspections, perc testing, and custom designs for gravity or aerobic septic systems. Trusted by homeowners and builders with 3 generations of expertise.

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