Can anyone install, replace, or repair a septic system in Mendon?

No.  Septic installers must be licensed by the Board of Health.

Below is a list of 2024 Permitted Septic Installers (Updated 01.08.2024)
(Alphabetically listed in no particular order of preference)                           

• ADC Septic, LLC - Blackstone, MA - (508) 883-9000
• Aldore Tetreault & Sons, Inc. - Mendon, MA - (508) 922-4924
• ALMIK Construction - Mendon, MA - (508) 726-5224
• Barrows Contracting - Upton, MA - (508) 529-4708
• Barrows Trucking - Worcester, MA - (508) 373-4087
• Boulanger & Sons - Mendon, MA - (508) 958-7598
• Braza Construction - Mendon, MA (508) 473-6053
• Chase/Harris - Sutton, MA - (508) 865-2007
• Curtis Septic Services - Northboro, MA - (508) 393-7234
• D & F Afonso Builders, Inc. - Milford, MA - (508) 478-7286
• Green Site Services Group, Inc. - Bellingham, MA - (508) 966-2020
• Iacovelli Excavating & Construction - Northbridge, MA - (508) 529-4690
• Jomi Corp. - Weymouth, MA - (781) 337-0037
• Meehan Realty Management Corp. - Mendon, MA - (508) 473-2800
• New Generation Custom Homes - Milford, MA - (508) 377-2395
• Tetreault, Inc. - Mendon, MA - (508) 478-5410
• Wind River Environmental - Marlboro, MA - (800) 499-1682