Business Details
50+ Years
experience
Expert Septic System Design & Consulting Services in Southwest Washington
McNair Septic Design & Consulting has been a trusted name in septic system design since 1972, built on three generations of expertise and a commitment to excellence. Our family-owned business combines decades of hands-on experience with modern technology to deliver reliable, property-specific solutions tailored to each client's unique needs. We handle every step of the septic design process, from soil evaluations to permitting, ensuring compliance with state regulations while prioritizing efficiency and cost-effectiveness. Our team holds a Washington State On-Site Septic Designer license and maintains full insurance to guarantee professional service that exceeds industry standards. With a 4.9-star reputation backed by hundreds of satisfied customers, we pride ourselves on transparent communication, lightning-fast turnaround times, and a proven process that simplifies complex systems.As an independent provider, we design for all approved septic system types without bias toward specific manufacturers, ensuring objective recommendations focused solely on client needs. Our one-stop approach eliminates the need to coordinate multiple contractors, streamlining projects from initial consultation to final approval. We serve Clark, Cowlitz, Lewis, Skamania, and Klickitat counties, offering free consultations and maintaining a steadfast commitment to integrity, quality, and flexibility in every interaction.
Services
Septic System Design
Perc Test/Soil Evaluation
Septic System Consulting
Septic Permitting Assistance
Property-Specific Solutions
Details
- Year established: 1972
Highlights and features
- Three generations of septic design expertise since 1972
- Lightning-fast turnaround from bid to submittal in 14 days
- Independent provider designing for all approved septic system types
- Transparent communication with clear timelines and updates
- Full-service permitting assistance handled by licensed professionals
Associations and certifications
- Washington State On-Site Septic Designer
What people say
Great to work with
Very professional
Lightning-fast turnaround
Highly recommend
Patient with questions
Services
Septic System Design
Our septic system design service creates customized solutions tailored to property-specific conditions, future plans, and regulatory requirements. We produce detailed plans including calculations, maps, and specifications within one to two weeks, ensuring compliance with county standards. Our designs prioritize efficiency, longevity, and cost-effectiveness while accommodating various system types.
Perc Test/Soil Evaluation
We conduct comprehensive soil evaluations to determine suitable septic system types based on soil composition and drainage characteristics. Our team handles all aspects including digging, testing, and submitting reports to county health departments. This critical first step ensures proper system approval and long-term functionality.
Septic System Consulting
Our consulting service addresses complex septic challenges and provides expert guidance for new builds or existing properties. We offer independent recommendations without manufacturer bias, leveraging decades of regional experience to solve site-specific issues. Services include system selection, regulatory compliance, and troubleshooting existing installations.
Septic Permitting Assistance
We manage complete permitting processes including applications, fee payments, and coordination with county health departments. Our expertise ensures timely approvals through accurate documentation and proactive communication. This service covers all necessary paperwork from initial submission to final as-built mapping requirements.
Property-Specific Solutions
Every project begins with a thorough analysis of property features, future plans, and regulatory constraints. We create tailored septic solutions that optimize system performance while minimizing costs. This approach ensures long-term reliability through site-specific design considerations rather than generic templates.
People
Cory McNair
Owner/Operator
Cory McNair leads daily operations with over 15 years of septic design experience. He joined the family business in 2005 after earning a bachelor's degree and working in management roles. Cory specializes in complex site solutions and maintains the company's commitment to quality and integrity.
Mike Dunning
Septic Designer
Mike Dunning joined the team in 2022, bringing a customer-focused approach developed through restaurant industry experience. He applies practical problem-solving skills to septic design challenges while ensuring regulatory compliance. Mike's attention to detail contributes to the company's high-quality standards.
Jackson McNair
Technical Designer
Jackson McNair joined in 2023 with an associate's degree in technical design. He combines formal education with hands-on experience to deliver precise, code-compliant septic solutions. Jackson's technical expertise and commitment to growth support the company's tradition of excellence.
Questions
How long does the septic design process take?
From bid approval to submittal, we complete designs in as little as 14 days, with most county reviews taking up to three weeks.
Do you perform perc tests and soil evaluations?
Yes, we handle complete soil evaluations including digging, testing, and submitting reports directly to county health departments.
What types of septic systems do you design?
We design all approved system types including gravity, pressure distribution, mound, sand filter, aerobic, and subsurface drip systems.
Can you help with county permitting?
Absolutely, we manage complete permitting processes including applications, fee payments, and coordination with county health departments.
Do you work with specific septic manufacturers?
No, we remain independent to provide unbiased recommendations focused solely on your property's requirements without manufacturer bias.
