To tie into an existing septic tank means adding input lines to it as a way of increasing its capacity.
If you have a septic system that works great but whose capacity is lower than you would like for it to be, adding an extra input line or more will solve your problem.
The new addition is installed in a manner that doesn’t affect the performance of the existing system.
Before you tie into your existing septic system, it’s prudent to check with your local authorities first. There are rules and regulations for such a project.
The new system will have to installed according to your state’s building code.
If your existing system cannot handle the additional load, you may have to upgrade the size of your tank and drain field as well.
Cost To Tie Into Existing Septic Tank
Average costs
| Lower cost | $1,000 |
| Higher cost | $4,000 |
| Average cost | $2,500 |
The cost of installing new lines on an existing sewer system depends on the position of the additional lines with respect to your septic tank. The further away the lines, the higher the cost.
Typically, expect to spend anywhere from $50 to $250 per linear foot for each line. The entire project will set you back $1,000 and $4,000.
To tie into an existing tank, you need to locate your septic tank, expose the drain line, cut out a section then install the new line.
The method of installation of your existing system affects the cost of the projects in more ways than one.
For example, if your tank is buried too deep in a manner that makes it difficult to expose, you might need help digging it out.
In that case, you will need help from septic specialitsts or proffesionals. This will cost you about $50 – $100 per hour. If the project takes a few days, you are looking at spending a pretty penny.
Additionally, your local code will dictate if you will need to replace your septic tank and enlarge a drain field. A 1000-gallon tank costs $600 – $1,000.
Digging out an existing leach field and putting up a new one costs a few thousand bucks.
Breakdown Of Costs
| Task | Cost |
| Pipes (PVC) | $50 – $250 per linear foot (more for copper and cast iron pipes) |
| Additional materials (cement, cutting tools, pipe cleaners, digging tools, etc) | $50 – $200 |
| New tank (if need be) | $600 – $1,000 (for a 1,000-gallon tank) |
| Enlarging the drain field (if need be) | $2,000 – $7,000 |
| Labor | $50 – $1000 per hour |
| Permits | $25 – $100 |
What Factors Affect The Cost To Tie Into Existing Septic Tank?
Here is a list of the factors affecting the cost of adding lines to your existing septic system.
1. Locating The Septic Tank
Locating a septic tank that has been buried underground for years is easier said than done.
First, you have to determine where the tank is placed by using a locator tool or by checking property records.
Once you do, you will need to dig the earth above it to expose the drain line.
Most people prefer hiring professional septic tank locators which costs a ton.
2. Location Of The New Lines
Location of the new lines will determine the amount of excavation and materials needed to install the new plumbing.
For example, if the new lines need to be installed through a rocky or uneven terrain, it may require additional excavation and equipment to install the pipes, which can increase the overall cost of the project.
And if the new lines need to be installed in an area with a high water table, additional materials and precautions may be needed to ensure the pipes are properly installed and do not become damaged or clogged
3. Material Of The Pipes
Septic tank line materials come in their numbers – cast iron, copper, or plastic.
Most people prefer working with PVC as they are cheaper and easier to work with.
However, if you want to go the cast iron or copper way, be prepared to part with more cash.
4. Depth of the existing septic tank
The deeper the septic tank, the more difficult and expensive it can be to connect to it.
See, additional excavation and equipment will be needed to reach the tank, which can increase the cost.
And if the tank is buried under a concrete slab, it may need to be cut out to gain access, which can be a labor-intensive process.
5. Condition of the existing septic tank
If the existing septic tank is old, damaged, or not up to code, it may require repairs or replacement before it can be tied into.
This can increase the overall cost of the project, as it may require additional materials and labor to bring the tank up to code.
6. Local Codes
Your local code also determines how much you end up spending to tie your existing septic system.
The cost of things like permits and inspections can add to the overall cost of the project.
And in case the code requires a bigger tank or an enlarged leach field, you are looking at a much more costly project than anticipated.
The Cost Of Tying Into An Existing Septic Tank Vs Installing A New Septic System
| Costs | Tie an existing septic system | Install a new septic system |
| Lower cost | $1000 | $3,600 |
| Higher cost | $4,000 | $10,000 |
| Average cost | $2,500 | $6,300 |
When your system works perfectly but is under capacity, it is prudent to add additional lines to it.
It is cheaper and less stressful than installing a new system.
However, if your existing tank and drain field cannot handle the additional burden, consider installing a new system altogether.
The cost of putting up a new tank and enlarging the leach field is way more.
How To Save Money On The Cost Of Tying Into Existing Septic Tank
You can save some coins on the cost of adding additional lines to a septic tank through the following ways:
I. Choose a location that is close to the existing septic tank
The closer the tie-in location is to the existing septic tank, the less expensive it will be to install the necessary plumbing and connect to the tank.
This can help reduce the overall cost of the project.
II. Hire a reputable contractor
While it may be tempting to hire the cheapest contractor, working a reputable contractor can save you a lot of money in the long run.
A good contractor will ensure the project is done right the first time, reducing the risk of costly procedural mistakes or repairs down the road.
III. Get multiple quotes
It’s important to get quotes from multiple contractors to ensure you’re getting a fair price for the project.
This can help you compare rates and choose a contractor that fits within your budget.
IV. Check for grants or incentives
Depending on your area, there may be grants or incentives available to help offset the cost associated with septic system installations, upgrades or tie-ins.
Check with your local government or utility company to see if there are any programs you can take advantage of.
Related: How to Apply For Septic Tank Grant
V. Use PVC instead of copper and cast iron lines
Copper and cast iron pipes can be more expensive due to their higher material and labor costs.
On the other hand, PVC pipes are easier to install, as they require fewer fittings and can be cut to fit with simple tools.
This can help reduce the amount of time and labor required to install the new plumbing, ultimately reducing the overall cost of the project.
FAQs
A. How do I know if my existing septic tank is suitable for tying into?
The best way is to check your local building code. The code details the regulations for tank sizes and leach fields for home septic systems.
For instance, if your existing tank is already too overwhelmed and your leach field is too saturated, it will not be possible to tie into the system.
B. What permits are required to tie into an existing septic tank?
You require pretty much the same permit you did when first installing your septic system.
The permit entails guidelines for putting up septic systems to ensure the protection of human health and the environment.
In case of any change in your home (such as installing additional lines to your septic system), you need another permit.
Related: Do You Need A Permit To Repair A Septic System?
C. What kind of maintenance will I need to do after tying into an existing septic tank?
Like permits, you will need pretty much the same maintenance routine as would in yur old septic tank. These may include but not limited to:
- Be sure to pump the tank regularly
- Always inspect the system for leaks
- Mark off and closely monitor the leach field
- Limit wastage of water
- Check the system for clogs regularly
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