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