Direct Answer
The best septic system installation & replacement contractors in Boston are verified through Massachusetts Office of Consumer Affairs (mass.gov/orr). Look for companies with 4.5+ Google stars, 50+ reviews, active MA license, and at least 5 years serving the Boston area.
Full Explanation
Verify any Boston contractor at Massachusetts Office of Consumer Affairs (mass.gov/orr). Request proof of general liability insurance and workers' compensation. Ask for references from recent Boston projects — local experience matters for understanding permit requirements and area-specific challenges.
Local Factors in Boston
📍Verify license: Massachusetts Office of Consumer Affairs (mass.gov/orr)
📍Boston city permit office issues local permits
📍Check BBB Greater Boston chapter
📍Require MA state license + local city license if applicable