Repairs & Installation
A field that has stopped taking water, a crushed line, or a system that has to be replaced.
There are no photographs on this site yet. Rather than fill it with stock pictures of somebody else’s work, each frame below says what photograph belongs in it.
Drain Field Repair & Replacement
A field does not wear out. It gets clogged.
What can be recovered, what has to be rebuilt, and how to tell which one you are looking at.
A drain field does not wear out. It clogs, from the inside.
The field is stone and perforated pipe in trenches, and its job is to hold water long enough for the soil underneath to take it. What ends that is a layer that forms at the boundary between the stone and the soil, built up out of the solids and grease in whatever reaches the field. Once that layer is thick enough, water stops passing through it.
That is why the tank matters so much. Everything that leaves the tank goes into the field, and a tank that has not been emptied is sending it the one thing it cannot handle. Age, tree roots, compaction from vehicles, and water arriving faster than the soil can take it all contribute. Solids from a neglected tank are the cause that is entirely avoidable.
What can be done about a failing field depends on how far gone it is, and that is a judgment made on the property rather than from a description. Some fields recover capacity when whatever was overloading them is corrected. Some have been saturated for years and will not.
What a field job can involve
- Finding the extent of it: which trenches still take water and which do not
- The distribution box, which is cheap and is sometimes the whole problem
- Correcting whatever is overloading the field, before rebuilding anything
- Replacing trenches: new stone, new pipe, and the clogged layer removed
- A new field in a new location, where the old ground is finished
- Getting the machine in and out, and putting the yard back
Rest it, repair it, or replace it
Three real options with different costs. Which one applies is decided on the property, not from a form.
Rest it
- Cheapest by a long way, where it is genuinely an option
- Works when the field is overloaded rather than finished
- Fix the cause first: an overdue tank, a leak, water running onto it
- Only helps a partially clogged field, and needs somewhere else for the water to go
- Not a fix for a bed that has been saturated for years
Repair it
- Replaces the part that has failed rather than the whole field
- A distribution box or one blocked trench can be the entire problem
- Less excavation, and less of the yard disturbed
- Needs the good part of the field to still be good
- Not always possible to tell which trenches those are without opening them
Replace it
- The answer when the ground itself has stopped accepting water
- A new field is a new working life rather than a reprieve
- Done once, properly, with the sizing right for the house
- The largest septic job there is, and the most disruptive to a yard
- Needs somewhere to put it, and a permit, and soil that will take it
Solid marks are the case for it, gray marks the cost of it. Both are real; which one wins depends on the property.
Line Repair & Replacement
Two pipes, and either one can stop everything.
The line from the house to the tank, and the line from the tank to the field.
Two pipes do all the work, and both of them are buried.
One line runs from the house to the tank. Another runs from the tank out to the field, or to a distribution box that splits it between trenches. Neither has any moving parts and neither is visible, which is why a problem in either one gets diagnosed as something else first.
Three things break them. Roots find pipe joints because that is where the water is, and once in, they fill the pipe. Weight from above crushes or cracks a line, which is why driving over a septic system matters. And ground settles, which can leave a section of pipe with a dip in it or no fall at all, so solids stop moving along it and start collecting.
The useful thing about line problems is that they are fixable in a way field problems are not. A length of pipe is a length of pipe, and once the ground is open the work is straightforward.
What line work involves
- Working out which of the two lines is the problem, which changes everything
- Locating the run, so the ground gets opened where the pipe actually is
- Clearing roots, or cutting out and replacing the damaged length
- Setting the fall correctly, because a flat line fills up again
- Bedding and backfill, so the ground does not settle onto it again
- The yard put back, with the turf replaced rather than left as spoil
How a damaged line gets replaced
The order matters, because getting it wrong means opening the same ground twice.
- 01Confirm which lineHouse to tank, or tank to field. The tank's levels answer this: liquid backed up above the inlet points one way, liquid above the outlet points the other.
- 02Find the runThe line is located before anything is dug, so the trench goes along the pipe rather than hunting for it. This is the step that decides how much of the yard is involved.
- 03Open and lookWhat is actually wrong is often not what was expected: a root mass in one joint, a section crushed flat, or a long shallow dip where the ground settled. The repair follows what is found.
- 04Replace and set the fallNew pipe, bedded, with a consistent fall from one end to the other. A line laid flat or with a dip in it works for a while and then becomes the same problem again.
- 05Backfill and finishCompacted in layers so the ground does not settle back down onto the new pipe, then the turf back on top. Settlement over a new trench is the most common complaint about this work and it is caused at this step.
New System Installation
A new system is a permit before it is a machine.
What has to happen before anyone digs, and why the soil decides the design.
The soil decides the system. Everything else follows from that.
A septic system is not a product you choose. It is a design that has to match the ground it goes into, because the whole thing depends on soil being able to accept water at a particular rate. Ground that drains fast, ground that drains slowly, a high water table, shallow bedrock and a slope all change what can legally and physically be built.
That is why the sequence starts with a soil evaluation and a permit rather than with a machine. In Tennessee a new system is a permitted installation and the design follows what the soil evaluation finds, which is also why nobody can quote a system from a photograph of a yard.
What it means practically is that the first conversation is about the property rather than the product: how many bedrooms the house has, where there is room, what the ground is like, and what the access is for getting a tank in.
What goes into an installation
- A soil evaluation, which decides what the field can be
- A permit, and a design sized to the house rather than to the lot
- The tank: set level, on bedding, with the inlet and outlet at the right heights
- The field: trenches, stone or chambers, pipe, and the fall set across it
- A distribution box where the design splits flow between trenches
- Access for the machine and the tank truck, planned before anything opens
Four ways a drain field gets built
All four do the same job: hold water long enough for soil to take it. Which one a property gets is decided by the soil evaluation, not by preference. Drawn in cross section through the ground.
The conventional build and the one most systems have. Separate trenches, each filled with stone around a perforated pipe, with fabric over the top to keep soil out of the stone. Water spreads along the pipe, down through the stone and out into the soil through the trench walls and floor. Simple, well understood, and it needs soil that will accept water at a reasonable rate.
Excavation & Backhoe Work
Most of a septic job is moving dirt.
Getting to a tank, a line or a field without taking the yard apart to do it.
Most of a septic job is moving dirt, and most of the damage is too.
Every job on this site except pumping involves getting a machine to something buried, opening the ground, doing the work and closing it again. What that costs is mostly a question of access: how far from the road the work is, what the machine has to cross to reach it, what is in the way, and what is in the ground where the trench has to go.
It is also where a job either leaves a yard looking worked on or looking wrecked. Spoil stacked on sheets rather than straight onto grass, turf cut and set aside in one piece rather than dug through, and backfill compacted in layers rather than pushed back in loose: none of that is difficult and all of it decides what the property looks like in a month.
Which is why it is worth talking about access before the day rather than on it. A gate that is too narrow or a septic tank behind a finished patio changes the plan, and it is a cheaper conversation in advance.
What access actually means
- Gate and side-passage widths, which decide what machine can get in
- What the machine has to cross: lawn, paving, a drive, a slope
- What is above the work: trees, a deck, a line, a shed
- What is in the ground: utilities, irrigation, a pool line, old pipe
- Where the spoil goes while the trench is open
- How the ground gets closed: compacted in layers, turf back on top
What is in the way?
Tick anything that applies to the route from the road to the tank. This counts what you ticked and says what it changes about the visit, which is usually how long it takes and what machine turns up.
Questions
Questions people actually ask.
Drain Field Repair & Replacement
How long does a drain field last?
Long enough that the honest answer is a range rather than a number, and what decides where in that range a particular field lands is mostly how well the tank was kept up. A field fed by a tank that was pumped on schedule lasts a great deal longer than one fed by a tank that was never opened, on identical ground.
Will a new field go in the same place?
Sometimes, and sometimes not. Rebuilding in the same trenches means dealing with ground that has already clogged once, so where a property has room, a new area is often the better answer. Whether yours has room is a soil and permit question before it is a machine question. See New System Installation.
Can something be poured into the system to fix the field?
There is a lot sold on that promise. What clogs a field is a physical layer at the soil boundary, and nothing added to a tank reliably removes it. Pumping the tank on time, and keeping grease and solids out of it, is the part that demonstrably affects how long a field lasts.
The field is where we wanted to build. Can it move?
A field can be relocated, and it is a full installation job rather than a modification: new area, new soil evaluation, new permit, new trenches. It is worth asking about before the building plans are finalized rather than after.
Line Repair & Replacement
Can a root blockage be cleared without digging?
Clearing a line mechanically can restore flow, and it does not remove the reason the roots got in. Where the pipe is otherwise sound that can be the right call. Where the joint is broken open, the roots come back, and the question becomes whether to keep clearing it or replace that length once.
How deep are these lines?
It depends on the property, the depth the line leaves the house at and the fall needed to reach the tank. It is enough that this is excavation work rather than hand digging, which is why a backhoe is part of the job.
Will you have to dig up the driveway?
Only if the line runs under it, and that is a question answered by locating the run first rather than by assumption. If you already know a line crosses your drive, say so when you call: it changes the job and it changes what putting it back involves.
Why did it settle after the last repair?
Backfill that was not compacted in layers. Loose soil dropped into a trench will consolidate on its own over the following months and leave a dip along the line of it. It is avoidable, and it is a function of how the trench was closed rather than how the pipe was laid.
New System Installation
How big a system does my house need?
Sizing is driven by the number of bedrooms rather than by the number of people currently living there, because the system has to serve the house over its life rather than its current occupants. The soil evaluation then sets how much field that number of bedrooms requires on your particular ground.
Who arranges the permit and the soil work?
Ask on the call, because this is one of the things this site deliberately does not state. A septic installation in Tennessee is permitted work and soil evaluation is a regulated activity, and nothing on record says which parts of that this business handles and which parts the homeowner arranges. It is the right question to ask first, and it is worth getting the answer from the person doing the job rather than from a web page.
Can a system be put in anywhere on the lot?
No. A field needs the right soil, enough room, separation from wells, property lines, buildings and surface water, and ground that is not already compacted or built on. On some lots there is one place it can go. On others the answer comes back that a conventional field will not work and the design has to change.
How long does the whole thing take?
The digging is not the long part. Soil evaluation and permitting set the timeline and they are not in any installer's hands, so the honest answer is that the paperwork decides and the installation is short by comparison. Anybody who gives you a total without knowing how your county is running is guessing.
Excavation & Backhoe Work
Will a machine wreck the lawn?
A tracked machine on soft ground leaves marks, and that is the honest answer rather than a reassurance. What limits it is planning the route, keeping spoil off the grass, and closing the ground properly. A yard that was driven over in wet weather recovers; a trench that was backfilled loose leaves a dip that does not.
What if the tank is under a patio or a deck?
Then the access has to be dealt with first, and that is a conversation before the job rather than a surprise during it. It happens often, because things get built over septic systems by people who did not know where they were.
Do utilities need locating before you dig?
Underground utilities get located before excavation, which is a legal requirement rather than a preference, and it is free to the person requesting it. Ask how it is handled on your job when you call. Private lines on a property, such as irrigation, an invisible fence or a line out to an outbuilding, are not covered by a utility locate, so anything you know about those is worth saying.
How long is the ground open for?
As short as the job allows, and it depends entirely on what the job is. A lid uncovered for a pump-out is open for part of an afternoon. A field replacement is a different scale of work. What is worth asking for either way is that it is not left open overnight without the hole being made safe.
The rest of the list
Repairs & Installation
A field that has stopped taking water, a crushed line, or a system that has to be replaced. Call and describe the property, or send the details and ask for someone to come and look at it.