About Us At Hamm Septic Service, Inc., our focus is on residential, condominium, and light commercial septic system design, installation, repair, and maintenance. We serve the southern New Hampshire towns of Bedford, Chester, Derry, Hampstead, Hollis, Hudson, Litchfield, Londonderry, Merrimack, Nashua, Pelham, Sandown, Salem, and Windham. We offer the following services at reasonable rates. TEST PITS FOR FAILED SEPTIC SYSTEMS SEPTIC SYSTEM DESIGN SEPTIC SYSTEM INSTALLATION & REPAIR EXCAVATION & SITE WORK SEPTIC SYSTEM INSPECTIONS SEPTIC TANK PUMPING POWER SNAKING (line from tank to house) BAFFEL REPAIR SEPTIC TANK FILTER CLEANING & REPLACEMENT SEPTIC TANK LOCATING SEPTIC TANK COVER EXTENSIONS (risers) PUMP STATION TROUBLESHOOTING & REPAIR FILTERS FOR SEPTIC VENTS Our professional staff is fully trained and insured.  A certificate of insurance is available upon request. Gary M. Hamm is our licensed designer and installer .