What is an OSS inspection?

An On-Site Septic System (OSS) inspection is a county-required service to ensure your septic system complies with local health and safety regulations.

How often do I need an OSS inspection?

Gravity flow systems need inspection every 3 years, while most other systems require annual inspection.

What does an OSS inspection include?

We inspect the tank, baffles, lid, drain field, pipes, and overall system function, measuring scum and sludge levels to determine if pumping is needed.

Do you provide written inspection reports?

Yes, we provide detailed reports for county compliance and your records.

Is OSS inspection required when buying or selling a home?

Yes, OSS inspections are often required during real estate transactions to ensure the system is in proper working order.

Expert Septic System Inspection

Serving Bellingham, Burlington, Sedro Woolley & All of Whatcom and Skagit Counties

Routine septic system inspection is essential for keeping your system compliant and running efficiently. Lil John Sanitary Services provides certified on-site septic inspections for home and business owners throughout Whatcom and Skagit Counties, including Bellingham, Burlington, Sedro-Woolley, Lynden and Ferndale. With 60 years in business, our licensed septic inspectors ensure your system meets county regulations and functions properly.

Why OSS Inspection?

A failing septic system can lead to expensive repair, health risks and environmental damage. Local regulations require routine septic compliance checks to prevent these issues. Regular professional assessments keep your on-site septic system working efficiently and ensure legal compliance.

MODERN SEPTIC SYSTEMS

These systems require annual inspection

Gravity Flow Systems

These only need to be inspected every 3 years

County Requirements

Compliance with local laws helps prevent fines and unexpected issues

Real Estate Transactions

Buyers and sellers may need a septic tank evaluation to confirm system health

What to Expect During Our Septic System Inspection

Our licensed septic inspectors follow a thorough process to evaluate your system’s condition to keep it in great shape and stay in compliance. If we detect issues, we’ll recommend the best course of action to keep your system in compliance.

Septic Tank Testing – Check liquid levels, baffles and overall function
Drainfield Assessment – Ensure proper drainage and identify issues
Component Inspection – Evaluate pumps, filters and alarms
Compliance Reporting – Provide detailed results for homeowners or county records

If we detect issues, we’ll recommend the best course of action to keep your system in compliance.

Trusted, Certified Septic Inspection Services

As a family-owned business since 1965, we take pride in providing honest, reliable service. Our team stays up to date with regulations and industry best practices, and we are proud members of WOSSA, the Whatcom Business Alliance and the Lynden Chamber of Commerce.

Schedule Your Inspection Today!

Stay ahead of potential problems with a licensed septic inspection from Lil John Sanitary Services. Contact us today to schedule a septic compliance check in Bellingham, Lynden or Ferndale.

Client Feedback & Reviews

Certified Septic System Inspection

Serving Bellingham, Burlington & Sedro-Woolley
and All of Whatcom & Skagit Counties