How to Start Designing a Septic System in Massachusetts

- Monday, September 01, 2025
Morse Engineering and Construction - Designing a Septic System in Massachusetts

Essential Steps for Homeowners

Getting Started

If you’re building or renovating in Massachusetts where no public sewer is available, you’ll need a septic system. Here’s how to get started.

1. Know the Rules

Septic systems in Massachusetts are regulated by Title 5, enforced by the Department of Environmental Protection (MassDEP) and your local Board of Health. Check local regulations for any extra requirements.

2. Evaluate Your Site

You’ll need a professional soil evaluation and percolation (“perc”) test to see how well your property handles wastewater and to find the best spot for your system. The Board of Health must witness and approve these tests.

3. Hire a Designer

A Registered Sanitarian or Professional Engineer must design your system. Choose someone with local experience—they’ll plan, draw up, and submit your septic design for permits and approval.

4. Submit and Approve Plans

Submit your engineered plans and an application to the Board of Health. Once approved, you’ll get a construction permit.

5. Installation and Inspection

Hire a licensed installer to build the system as designed. The Board of Health will inspect key stages and, once everything checks out, you’ll receive a Certificate of Compliance.

6. Maintain Your System

Have your septic tank pumped every 1–3 years, keep records, and use water wisely to keep your system healthy.

For more information, contact Morse Engineering and Construction.