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