How to Design & Install a New Septic System in Massachusetts: Risser Engineering's Complete Guide

Why You May Need a New Septic System in Massachusetts

Massachusetts homeowners rely on septic systems more than many realize. With a significant portion of the state's housing stock predating modern wastewater regulations, and with some of the most environmentally sensitive watersheds in New England at stake, understanding when and why a septic system needs to be replaced is not just a matter of property value. It's a matter of public health, environmental protection, and legal compliance.

Septic Systems Are Widespread Across Massachusetts

According to the Massachusetts Department of Environmental Protection (MassDEP) , approximately one-third of Massachusetts residents rely on private septic systems rather than municipal sewer infrastructure. That represents hundreds of thousands of systems across the Commonwealth, many of which are aging, undersized, or no longer compliant with current Title 5 regulations.

In towns like North Attleboro and across Bristol County, onsite septic systems remain the primary method of wastewater treatment for a large share of residential and commercial properties, particularly those outside the reach of municipal sewer service.

Many Massachusetts Septic Systems Are Aging and Failing

The U.S. Environmental Protection Agency (EPA) estimates the average conventional septic system has a design life of 25 to 30 years . Massachusetts has a large inventory of homes built between the 1940s and 1980s, meaning a substantial number of systems are operating well past their intended lifespan.

The EPA further estimates that approximately 2.5 million septic systems fail across the United States each year. In Massachusetts, failing systems are among the most cited contributors to:

• Groundwater contamination affecting private drinking water wells
• Surface water degradation in rivers, ponds, and coastal estuaries
• Nitrogen loading into sensitive coastal and inland water bodies

Massachusetts Has Some of the Strictest Septic Regulations in the Country

Massachusetts regulates onsite septic systems under Title 5 of the State Environmental Code (310 CMR 15.00). In fact, it’s one of the most comprehensive and stringent sets of septic regulations in the United States. Administered by MassDEP and enforced at the local level by Board of Health (BOH) officials, Title 5 establishes strict standards for:

• System design and sizing
• Setback distances from wells, wetlands, waterways, and property lines
• Soil evaluation and percolation testing requirements
• System inspection at time of property sale or transfer
• Prohibition of cesspools and other outdated system types

According to MassDEP , a septic system inspection is required in Massachusetts whenever a property is sold or transferred , when a property is being subdivided, or when a building permit is sought for an expansion. Failing inspections trigger mandatory system upgrades.

Step-by-Step Septic System Design & Installation Process

Step 1: Site Consultation and Feasibility Assessment

Every project starts with a thorough site visit. Risser Engineering evaluates property topography, proximity to wetlands and resource areas, existing system conditions, project scope, and whether municipal sewer connection is required under local bylaws. This step identifies constraints early and sets a realistic project path before any significant costs are incurred.

Step 2: Soil Evaluation and Percolation Testing

Under Title 5, soil evaluations must be performed by a Massachusetts Licensed Soil Evaluator in the presence of a Local Approving Authority (LAA) representative. Risser Engineering coordinates licensed soil evaluators to conduct soil test pit excavations, soil morphology analysis, percolation testing, and groundwater observation.

Scheduling these tests requires advance coordination with your local Board of Health. Risser Engineering handles all scheduling on your behalf to keep the project on track and ensure full regulatory compliance.

Step 3: Title 5 System Design and Engineering

Risser Engineering's licensed Professional Engineers develop a fully compliant Title 5 design based on soil data, property conditions, and applicable MassDEP and Board of Health requirements. A complete design package includes an engineered site plan, design flow calculations, septic tank sizing, Soil Absorption System (SAS) design, and pump system design if required by site conditions.

For sites where conventional systems are not feasible due to shallow soils, high groundwater, or proximity to resource areas, Risser Engineering designs MassDEP-approved Innovative/Alternative (I/A) systems , including pressure-dosed systems, recirculating sand filters, drip irrigation disposal systems, and nitrogen-reducing systems increasingly required in Southeastern Massachusetts watersheds.

Step 4: Board of Health Permit Application

Septic permits in Massachusetts are issued at the local level by the Board of Health (BOH) . Risser Engineering prepares and submits the complete permit application on your behalf, including stamped engineering plans, soil evaluation data, design calculations, and any supporting documentation required by your local BOH.

Risser Engineering's familiarity with Board of Health processes across North Attleboro and Bristol County means applications are presented accurately and reviewed efficiently.

Step 5: Pre-Construction Coordination

Before installation begins, Risser Engineering verifies that the installer holds a valid Disposal System Installer (DSI) license which is issued by the board of health for each individual town, conducts a pre-construction site meeting to review approved plans and stake component locations if it is requested, and confirms that all specified materials meet the approved design.

Step 6: Construction Observation

Title 5 requires inspections by both the Local Approving Authority and the design engineer before backfilling. Risser Engineering provides independent construction observation, monitoring excavation depths, tank placement, pipe grades, leaching component installation, and final grading. Any field deviations from the approved design are addressed in real time.

Step 7: As-Built Plan and Engineer's Certification

After construction, Risser Engineering prepares the required As-Built Plan and Engineer's Certification to support the issuance of your Title 5 Certificate of Compliance by the local Board of Health. Under Title 5, as-built plans must be submitted within 30 days of system acceptance. Risser Engineering manages this deadline and provides you with a complete documentation package for your records.

Why Property Owners Choose Risser Engineering

Risser Engineering brings local knowledge and licensed professional engineering expertise to every project. We understand Title 5 requirements, the expectations of local Boards of Health across Bristol County, and the environmental sensitivities of the region's watersheds and resource areas.

Working with Risser Engineering includes:

• Massachusetts PE-stamped Title 5 system design
• Licensed Soil Evaluator coordination and BOH scheduling
• Full Board of Health permit application management
• Conventional and I/A system design expertise
• Construction observation and inspection coordination
• As-built plan preparation and Certificate of Compliance support
• Variance preparation when site conditions require it