What Are The Most Common Problems With Septic Tanks?
- 3 days ago
- 4 min read
A septic tank is a reliable way to manage wastewater for homes that are not connected to the main sewer system.
When properly designed, installed and maintained, a septic system can work efficiently for many years.
However, like any drainage system, septic tanks can develop problems over time.
Understanding the most common issues can help you spot warning signs early and avoid costly repairs.
Below are some of the most common septic tank problems homeowners experience.
1. A Septic Tank That Needs Emptying
One of the most common problems is simply a tank that has not been emptied often enough. Over time, solid waste builds up at the bottom of the tank.
If septic tank emptying or septic tank pumping is not carried out regularly, the sludge level rises and begins to block the outlet pipe.
This can cause:
Slow draining sinks and toilets
Bad smells around the tank or drains
Sewage backing up into the house
Most households should arrange septic tank cleaning or pumping roughly once a year, although the frequency can depend on the septic tank size and how many people live in the property.
NOTE: We do not offer a septic tank emptying service, however we can assist if you are experiencing problems with your septic tank functionality.
2. Blocked Pipes or Drainage Field Failure
The drainage field (also called a soakaway) is where treated wastewater leaves the septic tank and filters through the ground.
If solids escape the tank because it has not been pumped regularly, they can block the drainage field.
This can lead to:
Water pooling in the garden
Strong sewage smells
Very slow draining toilets and sinks
Once a drainage field becomes blocked, repairs can be expensive. Regular septic tank servicing helps prevent this issue.
3. Poor Septic Tank Design or Installation
Another common problem occurs when the septic tank design or septic tank installation was not done properly.
Examples include:
Incorrect septic tank size for the property
Poorly positioned drainage field
Insufficient distance from buildings or watercourses
Poor ground conditions for drainage
For example, installing a 1000 gallon septic tank where a larger system is required can lead to constant overloading and frequent pumping.
This is why correct septic tank installation and professional groundworks are essential. As professional installers of septic tanks and soakaways we can make sure your septic tank is suitable for all your needs now and into the future. Please get in touch if you wish to discuss your septic tank requirements.
4. Structural Damage to the Tank
Septic tanks can sometimes crack or fail structurally, particularly with older systems.
A concrete septic tank may develop cracks over time, while a plastic septic tank can sometimes deform if the ground shifts or the tank was not installed correctly.
Signs of damage can include:
Ground sinking above the tank
Wastewater leaking into surrounding soil
Unusual smells around the tank area
If structural damage occurs, the tank may need repair or full replacement, and we can assist with this. Please feel free to get in touch to discuss your requirements.
5. Incorrect Waste Entering the System
Many septic tank problems happen because things are flushed or poured down drains that should not enter the system.
Common offenders include:
Wet wipes
Sanitary products
Cooking fats and oils
Harsh chemical cleaners (please see this blog post for a list of septic tank friendly household cleaning products)
These materials can block pipes, disrupt the natural bacteria inside the tank, and increase the need for septic tank pumping or cleaning.
Using a septic-safe cleaner and avoiding non-biodegradable waste can help keep your system working properly.
6. Poor Maintenance or Lack of Servicing
Some homeowners forget about their septic tank until something goes wrong. Regular septic tank service allows a professional to check:
Sludge levels
Tank condition
Pipe connections
Drainage field performance
Routine inspections can catch small issues before they become expensive repairs. We can assist with a septic tank service. Please make contact if you wish to discuss this.
7. Access Issues Around the Tank
Sometimes the septic tank itself is working fine, but access becomes difficult. Older systems may not have a proper septic tank riser, which makes inspection and emptying harder.
Tanks buried too deeply or under landscaping can also create problems for maintenance.
Adding proper access points makes septic tank pumping and servicing much easier.
How to Prevent Septic Tank Problems
Most septic tank issues can be avoided with good maintenance and responsible usage.
Key steps include:
Arrange regular septic tank emptying (we do not offer this service)
Avoid flushing non-biodegradable waste
Use septic-safe cleaning products
Have your system inspected periodically
Ensure the tank and soakaway are correctly installed
If you're unsure how your system works, it's worth learning how a septic tank works so you can spot early warning signs.
When to Call a Professional
If you notice slow drains, bad smells, standing water in the garden, or suspect your system needs servicing, it’s best to arrange a professional inspection. We can assist with this, please do make contact if you are experiencing issues.
We are qualified contractors and can assess your septic tank, and carry out septic tank repairs or upgrades if required.
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