The Planting Distance Checker compares a planned planting spot with a guideline distance from your sewer lateral. Choose the plant group, enter the distance in metres, your pipe type and whether a root barrier is planned. It returns Meets guideline, Borderline or Too close, plus advice about pipe joints, barriers and locating the line. It is a planning aid, not a survey.
- Each plant group has a minimum and a preferred distance; at or beyond preferred meets the guideline, between the two is borderline, under the minimum is too close.
- Willows, poplars, aspen and cottonwood need 15 m; closer than that, the checker says to avoid planting there.
- Perennials, grasses and groundcovers have no distance requirement and can go over the line.
- Clay, concrete or unknown pipe triggers advice to seal or line the joints first, because a barrier cannot fix open joints.
- Measure from the lateral's route, and locate your private line before planting; public locate services do not usually mark it.
Planting Distance Checker
01 /What does the Planting Distance Checker do?
The checker answers one practical question: is the spot you have chosen far enough from the sewer lateral for the plant you want to put there? You pick a plant group, enter how far the planting hole will be from the line, tell it what the pipe is made of and whether you plan a root barrier. It compares your distance with a minimum and a preferred guideline for that group and gives a plain result with advice lines.
The guideline distances come from the planning table in root barriers and planting distances. They are conservative rules of thumb drawn from common arboricultural and municipal practice; no national code sets them. The checker adds a preferred distance to each group so you can see not only whether a spot is acceptable but whether it has a comfortable margin.
02 /What do you enter?
| Input | Choices | Notes |
|---|---|---|
| Plant | Six groups, listed with example species (see below) | Pick the group for the plant's mature size and habit |
| Planned distance from the lateral | A number in metres | Measure from the planting spot to the nearest point on the sewer route |
| Pipe | Plastic solvent-welded; plastic gasketed; clay or concrete; cast iron; unknown | Choose unknown if you have not seen the pipe on camera |
| Root barrier planned | Yes or no | A physical barrier between the plant and the line |
The plant choices map the species most often asked about in Canadian yards onto six groups:
- Willow group: willow, poplar, aspen and cottonwood.
- Large shade trees: elm, silver maple, Manitoba maple, green ash and linden.
- Medium trees: birch, spruce, pine and larger crabapples.
- Small trees: Amur maple, Japanese tree lilac and small ornamental crabapples.
- Shrubs: lilac, dogwood, caragana and potentilla.
- Perennials: perennials, ornamental grasses and groundcovers.
If your plant is not named, choose the group that matches its expected mature size and how thirsty and vigorous it is. When in doubt between two groups, choose the larger one.
03 /How does the checker decide the result?
Each group has a minimum and a preferred distance from the lateral. The checker compares your planned distance with those two numbers and returns one of three results.
| Group | Minimum | Preferred |
|---|---|---|
| Willow group | 15 m | 15 m |
| Large shade trees | 10 m | 12 m |
| Medium trees | 6 m | 8 m |
| Small trees | 3 m | 5 m |
| Shrubs | 2 m | 3 m |
| Perennials, grasses, groundcovers | 0 m | 0 m |
| Result | Rule | What it means |
|---|---|---|
| Meets guideline | Distance is at or beyond the preferred distance | The spot follows the guideline with its margin |
| Borderline | Distance is at or beyond the minimum but short of the preferred | Acceptable on paper with little margin; sound pipe matters more here |
| Too close | Distance is less than the minimum | Choose a smaller plant or a spot farther from the line |
Two groups behave differently. For the willow group the minimum and preferred distances are the same, so there is no borderline band: at 15 m or more the result meets the guideline, and anything closer falls below the minimum, where the checker says 'Avoid planting here'. For perennials, grasses and groundcovers both distances are zero, so any distance meets the guideline, including directly over the line.
04 /What advice does it add?
Along with the result, the checker shows short advice lines that explain what distance alone cannot fix.
- Clay, concrete or unknown pipe: seal or line the joints before planting, because a barrier cannot fix open joints. Old jointed pipe leaks at every joint, and those joints attract roots from any tree that can reach the trench.
- Barriers: a barrier helps but does not replace distance. Barriers deflect roots downward and sideways; on deep laterals roots can grow beneath them.
- Locating the line: public locate services mark utility-owned lines. Your private lateral may need a private locate, typically a sewer camera with a sonde traced from the surface.
Your barrier answer and your pipe type do not change the distance thresholds. The result is always the plant group against your measured distance; pipe and barrier inputs shape the advice around it. That keeps the result simple and honest: a barrier or a plastic pipe reduces risk, but neither turns a too-close spot into a recommended one.
05 /How should you measure the distance?
Measure from where the trunk or main stem will be to the nearest point on the sewer lateral's route, not to the house or the cleanout. Roots travel easily through the loose backfill of the sewer trench, so a spot far from the foundation can still sit close to the line.
- Find both ends
The lateral leaves the foundation near the main cleanout or floor drain and runs to the main in the street or lane.
- Locate the route
A camera with a sonde lets an operator mark the route and depth on the ground. Laterals can angle or bend, so a straight line between the ends is only an estimate.
- Mark and photograph
Paint or flag the route and photograph it against fixed points, so you can measure again later.
- Measure to the planting spot
Use the shortest distance from the planned trunk position to the marked route.
- Check the neighbour's line
Near a shared lot line, find out where the neighbour's lateral runs too, and test that distance as well.
06 /What are the checker's limits?
- It does not know where your lateral is. The distance is only as good as your locate.
- It works with groups, not individual species or cultivars. A columnar cultivar and a full-size tree of the same species can differ a lot.
- It does not model soil, water or climate. Irrigation, downspouts, high water tables and dry summers all change how roots behave.
- It does not look at existing trees. Mature trees already near the line need a different question; use the Root Risk Calculator.
- It does not check bylaws. Boulevard planting, protected trees and front-yard rules are set by your municipality.
- It is not engineering or arboricultural advice. For large trees near important services, ask a certified arborist.
07 /What should you do with a Borderline or Too close result?
A Too close result means choosing either a smaller plant group or a spot farther from the line. Run the checker again with the alternatives until you reach Meets guideline or at least Borderline. Sewer-safe trees and shrubs lists small, hardy species, and the worst trees for sewer lines explains why the willow group and large shade trees need so much room.
A Borderline result is acceptable on paper, but the margin is thin, so the pipe matters more. On solvent-welded plastic in good condition, a borderline spot is a reasonable choice. On clay, concrete or unknown pipe, get the line on camera first, and consider sealing the joints before adding trees; how to stop roots growing in a sewer line ranks the options. If you want a camera inspection and locate before planting, request quotes.
FAQQuestions people ask
How far should a tree be from a sewer line?
The checker uses 15 m for willows, poplars, aspen and cottonwood; a 10 m minimum and 12 m preferred for large shade trees; 6 m and 8 m for medium trees; 3 m and 5 m for small trees; and 2 m and 3 m for shrubs. These are planning guidelines, not code requirements.
Can I plant anything over my sewer line?
Perennials, ornamental grasses and groundcovers have no distance requirement in the checker and are generally fine over the line. Keep trees and shrubs off the trench.
Does a root barrier let me plant closer?
No. The checker's distance thresholds do not change with a barrier. A barrier helps, but it does not replace distance, especially on deep laterals where roots can pass beneath it.
Why does my pipe type matter if it does not change the result?
Clay, concrete or unknown pipe adds advice to seal or line the joints before planting, because open joints attract roots from any tree that can reach the trench, whatever the distance band.
How do I find my sewer line before planting?
Public one-call services mark utility-owned lines, but your private lateral usually needs a private locate, typically a sewer camera with a sonde traced from the surface.
My tree is already planted too close. What now?
The checker is for planned plantings. For an existing tree, use the Root Risk Calculator and consider a camera inspection to see whether roots are entering the pipe.
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