Southern New Hampshire's Trusted Septic Experts
Residential Septic Installation, Repair & Design in Southern New Hampshire
Dependable Construction Co., Inc. has proudly served Southern New Hampshire homeowners since 1971. We specialize in residential septic system installation, repair, replacement, design, leach fields, and excavation with honest recommendations, licensed expertise, and dependable service.
- Family-Owned Since 1971
- Licensed Septic Installer
- Licensed Septic Designer
- Fully Insured
- Honest Recommendations
What We Do
Complete Septic Services for Homeowners
From new installations to emergency repairs, we handle every aspect of residential septic systems with licensed expertise.
Septic System Installation
Complete residential septic system installation from site evaluation to final inspection, built to last decades.
Learn MoreSeptic System Repair
Fast, reliable repairs for failing drain fields, cracked tanks, and backup issues—diagnosed and fixed right the first time.
Learn MoreSeptic System Design
Custom septic system design tailored to your property's soil, slope, and household size, fully permitted and compliant.
Learn MoreSeptic System Replacement
Full system replacement for aging or failed septic systems, minimizing disruption to your property and budget.
Learn MoreLeach Field Installation & Replacement
Expert leach field installation and replacement to restore proper drainage and extend the life of your system.
Learn MoreResidential Excavation
Professional excavation services for site preparation, grading, trenching, and utility installation on residential properties.
Learn MoreWhy Choose Us
Homeowners Trust Dependable Septic
For over 50 years, families across Southern New Hampshire have relied on our honesty, expertise, and craftsmanship.
Over 50 Years of Experience
Five decades of hands-on septic expertise serving Southern New Hampshire homeowners.
Learn MoreLicensed & Insured
Fully licensed septic installers and designers, carrying comprehensive insurance for your protection.
Learn MoreFamily-Owned Company
A family business treating every customer like a neighbor since 1971.
Learn MoreResidential Specialists
We focus exclusively on residential septic, so your home gets our full attention and expertise.
Learn MoreHonest Recommendations
Straightforward advice and honest assessments—we'll never upsell you on unnecessary work.
Learn MoreQuality Workmanship
Meticulous installation and repair built to meet and exceed New Hampshire state standards.
Learn MoreOur Process
A Straightforward Path from Start to Finish
No surprises, no pressure. Just a clear, proven process designed to give you confidence from first call to final walkthrough.
- 1
Contact Us
Reach out by phone or email. We'll respond promptly.
- 2
Schedule a Consultation
We'll set up a convenient time to visit your property and assess your needs.
- 3
Site Evaluation
Our team evaluates your soil, terrain, and system requirements to recommend the right solution.
- 4
Professional Installation or Repair
Licensed professionals complete your project with precision and care.
- 5
Final Walkthrough
We review the completed work with you, answer questions, and ensure your satisfaction.
Know the Signs
Signs You May Need Septic Service
Recognizing problems early can save you thousands in repairs and protect your home and family.
Slow Drains
Sinks, tubs, or toilets draining slowly could indicate a full or failing septic tank.
Standing Water
Puddles or soggy areas near your septic tank or drain field signal trouble.
Bad Odors
Unpleasant sewage smells around your home or yard may mean your system needs attention.
Wet Lawn
A persistently wet or unusually green patch of lawn above the drain field is a red flag.
Sewage Backup
Sewage backing up into your home is an emergency—call us immediately.
Old Septic System
Systems over 20-25 years old may need inspection or replacement to avoid failure.
If you're experiencing any of these issues, contact us before the problem becomes more expensive.
Contact UsService Area
Proudly Serving Southern New Hampshire
We serve homeowners across Rockingham and surrounding counties. Don't see your town? Give us a call.
Hampstead
Plaistow
Atkinson
Danville
Sandown
Chester
Derry
Newton
Salem
Fremont
Raymond
Our Work
Project Gallery
A look at recent septic installations, repairs, and excavation projects across Southern New Hampshire.
Customer Reviews
What Our Neighbors Say
Five decades of trust, built one homeowner at a time.
Dependable Septic replaced our entire system in under a week. The crew was professional, clean, and kept us informed every step of the way. We couldn't be happier.
FAQ
Frequently Asked Questions
Answers to the questions homeowners ask us most. Don't see yours? Just give us a call.
Homeowner Learning Center
Get expert answers to common septic questions, learn how to protect your investment, and explore helpful homeowner guides written by experienced professionals.
Troubleshooting Guide10 Signs Your Septic System May Be Failing (And What You Should Do Next)
Septic systems usually give warning signs before they fail completely. Here are ten signs every homeowner should know — and what to do if you spot them.
Read ArticleHomeowner GuideSeptic Repair vs. Replacement: Which One Do You Need?
An honest guide to deciding between septic repair and replacement — what can be fixed, when a new system makes sense, and what a professional evaluates.
Read Article
Homeowner GuideHow Does a Septic System Work? (A Homeowner's Guide)
A simple, plain-English explanation of what happens after water leaves your home — and why understanding it can help you avoid expensive repairs.
Read Article