Hi, Nathan here. Today we'll discuss choosing the right septic system for your property in Christchurch, given local regulations and soil conditions. If that sounds interesting to you, stick around!
Before we start though, I want to remind you that we manage every step of the process, so you can enjoy peace of mind knowing that you don't have to be an expert in all of this.
Understanding the Types of Septic Systems
When it comes to septic systems, there are three primary types to consider: gravity, aerated, and mound systems. Each has its own strengths and is suited to different soil types and conditions in our beautiful city.
Gravity Septic Systems
Description:
Gravity systems are the most traditional type of septic system, relying on gravity to move wastewater from your home to the septic tank and then to the drain field.
Suitability:
These systems work best in properties with well-draining soils, such as sandy or loamy types. Christchurch's eastern suburbs often have these favourable soil conditions, making gravity systems a common choice.
Considerations:
If you have clay soil, which is prevalent in some areas around Christchurch, a gravity system may lead to drainage issues. But don’t worry! As part of our service, we conduct thorough soil assessments to ensure you get the right system.
Local Regulations:
Here’s where it gets a bit technical: gravity systems must be set back a minimum distance from property boundaries and water sources as stipulated by the Christchurch City Council.
But rest assured, we handle all the paperwork and ensure compliance with these regulations, so you don't have to lift a finger.
Example regulations we look after for you
Water sources:
A gravity system must be at least 50 metres away from any potable water supply (such as wells or bores) to prevent contamination.Water bodies:
Septic tanks and drainage fields should be at least 20 metres away from surface water, including rivers, lakes, and streams.Property boundaries:
Typically, the system needs to be set back at least 1.5 metres from property lines.
These requirements apply to most septic systems.
Aerated Wastewater Treatment
Description:
Aerated septic systems, or aerobic treatment units (ATUs), introduce oxygen into the wastewater to promote the growth of bacteria that efficiently break down waste.
Suitability:
These systems shine in challenging soil conditions. If your property has compacted clay soil or is prone to flooding, such as in areas near the Port Hills, an aerated system may be the ideal solution.
Considerations:
While aerated systems require more maintenance and a power source, our team manages all ongoing maintenance needs and ensures everything runs smoothly. We’re with you every step of the way, from installation to routine checks.
Local Regulations:
Aerated systems need to meet specific standards set out by the Christchurch City Council. But you can relax—our experts take care of all the necessary permits and inspections to keep you compliant.
Example regulations we look after for you
Soil and Site Assessments:
Before an aerated system can be installed, a comprehensive soil and site assessment must be carried out. Aerated systems are often chosen for sites with challenging soil conditions, such as clay or areas with a high water table, but the system's suitability must be confirmed through soil permeability tests and assessments of the site's drainage capabilities.
Effluent Disposal:
The treated effluent from an aerated system must meet the standards set by the Christchurch City Council for nitrogen and phosphorus levels to protect local water sources and ecosystems. Effluent disposal fields need to be appropriately sized and designed to disperse treated wastewater into the soil safely.
Mound Systems
Description:
Mound systems are elevated systems designed for properties with high groundwater levels or poor drainage, using a mound of soil to treat wastewater effectively.
Suitability:
If your property is located in a low-lying area near the Waimakariri River, where the water table is often close to the surface, a mound system can be the best choice to ensure proper wastewater treatment.
Considerations:
While mound systems can be more expensive due to additional construction, our team at DrainPro ensures that the installation process is as seamless as possible. We provide a complete service, from design to installation.
Local Regulations:
Mound systems have specific requirements, such as the size and design, which are governed by the Christchurch City Council. No need for you to worry about this—our professionals will ensure your system meets all the necessary regulations.
Example regulations we look after for you
Soil and Site Assessments:
Because mound systems are often used in areas with challenging soil conditions, an in-depth soil and site assessment is required. This includes:
Percolation tests to determine the soil’s ability to absorb wastewater.
Depth to groundwater to ensure the mound is elevated sufficiently to prevent groundwater contamination. Mound systems are often used in Christchurch areas with clay-heavy soils or high water tables, such as parts of the Canterbury Plains.
Mound Design Requirements:
Mound systems need to be designed to account for the specific conditions of the property. Some key factors that must be considered include:
The height of the mound should be adequate to provide sufficient treatment of the effluent before it enters the natural soil.
The drainage area must be large enough to accommodate the expected volume of wastewater. Christchurch regulations often require a licensed engineer or drainage expert to design the system, ensuring it meets both local and national standards.
Conclusion
Choosing the right septic system for your Christchurch property doesn’t have to be daunting. At DrainPro, we manage every aspect of the process, from the initial soil assessment to the final installation and ongoing maintenance. Our expertise ensures that your system is tailored to your property’s unique conditions while remaining compliant with all local regulations.
If you’re considering a septic system or need guidance on what’s best for your home, reach out to us at DrainPro. We’re here to help make the process smooth and hassle-free, giving you the confidence that your wastewater management is in the best hands.
