Common Mistakes to Avoid When Planning a Septic System
Planning a septic system may not be the most exciting part of building or renovating your home—but it’s one of the most important. Your septic system handles all the wastewater your household produces, and if it’s not designed and installed correctly, it can lead to costly repairs, failed inspections, and even environmental damage.
At Townes Septic Services, we’ve seen firsthand how early planning missteps can cause long-term problems. This guide breaks down the most common septic planning mistakes homeowners make—and how to avoid them.
1. Failing to Evaluate Soil Conditions
Not all soil is created equal. Septic systems rely on the soil’s ability to absorb and filter wastewater safely, which is why a professional soil test (perc test) is essential before you break ground.
Common Mistake: Skipping the test or assuming the land is suitable without expert evaluation.
Why It Matters: Poor soil drainage can cause your system to fail, leading to standing water, sewage odors, and system backups.
Townes Tip: Always schedule a professional site evaluation before choosing a location for your septic system. Our team conducts thorough assessments to ensure your land meets state and local requirements.
2. Underestimating Future Home Size or Usage
Septic systems are designed based on the number of bedrooms (not bathrooms!) in a home. Planning a modest two-bedroom cabin now? That’s fine—unless you plan to add more rooms later.
Common Mistake: Designing a system that’s too small for future home additions or increased occupancy.
Why It Matters: An undersized system can quickly become overwhelmed, reducing its lifespan and increasing your maintenance costs.
Townes Tip: Think long-term. Even if your home is small now, discuss future plans with your septic provider so the system can be designed to grow with your needs.
3. Poor Placement on the Property
Septic systems aren’t just installed wherever it’s convenient. They must be placed according to local setback requirements from wells, property lines, water bodies, and structures.
Common Mistake: Choosing a location too close to buildings, trees, or water sources.
Why It Matters: Improper placement can lead to legal issues, system malfunctions, or contamination of groundwater.
Townes Tip: Our team reviews your entire property layout to select a septic site that balances functionality, compliance, and minimal future disruption.
4. Ignoring Drainage and Surface Water Flow
Even the best septic system can fail if surface water isn’t managed properly. Rain and runoff can flood the drainfield, making it impossible for the soil to treat wastewater.
Common Mistake: Installing a system in a low-lying area or without considering drainage patterns.
Why It Matters: Excess water can lead to clogs, backups, and permanent drainfield damage.
Townes Tip: We incorporate grading and drainage planning into every system installation, so your system stays protected—even in New Hampshire’s wettest seasons.
5. Choosing the Cheapest Bidder
Septic systems aren’t a great place to cut corners. Choosing a contractor based on price alone may result in rushed work, poor materials, and a system that doesn’t meet code.
Common Mistake: Hiring unlicensed or inexperienced contractors to save money.
Why It Matters: Inadequate installation leads to costly repairs, failed inspections, and even complete system replacements.
Townes Tip: We provide transparent pricing, expert installation, and long-term support. Our licensed technicians ensure your system is installed right—the first time.
Final Thoughts: Get It Right the First Time with Townes
Planning your septic system carefully can save you thousands of dollars and years of stress. Whether you’re building a new home or upgrading an old system, it pays to work with experienced professionals who know how to avoid these common mistakes.
At Townes Septic Services, we’ve been helping New Hampshire homeowners plan and install reliable septic systems for years. From soil testing and system design to grading and final installation, we handle the entire process with care and precision.
Frequently Asked Questions
How do I know if my land is suitable for a septic system?
Start with a soil and site evaluation. We perform perc tests and property assessments to determine if the land can support a system.
Can I install the septic system myself?
While New Hampshire allows property owners to perform certain work, we strongly recommend using licensed professionals to ensure compliance, safety, and long-term performance.
What permits do I need for a septic system?
You’ll need a state-approved septic design and a local installation permit. Our team handles all necessary paperwork to streamline the process.
How long does it take to install a septic system?
Depending on site conditions, permitting, and system type, the process can take anywhere from a few days to several weeks.
Don’t let septic mistakes derail your project.
Contact Townes Septic Services today for expert help with site evaluations, system planning, and installation across southern New Hampshire.