Trees, slabs and aging lines
La Mirada Regional Park is one of the city's large green spaces, and the residential blocks around it have had more than half a century for yard and parkway trees to grow. Big trees are a pleasure until their roots find a cracked clay joint in a sewer lateral, which is one of the most frequent reasons for repeat backups in older parts of town.
Most houses nearby were built as tract homes on concrete slabs. Where the original supply pipe is still in service, owners may see slab leaks in copper hot-water lines or slowly fading pressure from galvanized pipe. Homes that have been remodeled or repiped may have newer copper or PEX run through the attic instead.
What to watch for here
| Issue | Clue | Next step |
|---|---|---|
| Roots in the lateral | Backups every few months at the lowest drain | Camera inspection through the cleanout |
| Hot-water slab leak | Warm floor and a moving meter | Meter test, then leak detection |
| Galvanized pipe | Brown morning water, weak far fixtures | Ask about partial or whole-house repiping |
| Scaled fixtures | Weak aerators and white crust | Clean regularly; consider descaling equipment |
Trees and your sewer line
- IfA large tree stands between the house and the streetThenKnow where your lateral runs and watch for slow drains.
- IfBackups keep returning after snakingThenGet camera video to see whether roots are entering at a joint.
- IfThe tree is in the parkwayThenCheck with the city before cutting roots near it or removing it.
- IfYou are planting a new treeThenKeep it well away from the path of the lateral.
Homeowner checklist for this area
- Find and uncover the sewer cleanout.
- Run a meter test once or twice a year.
- Note the type of pipe visible at the water heater.
- Keep any camera video from past drain work.
- Map your water and gas shutoffs.
Who to contact
- Permits and questions about parkway trees or sewer connections: check with the City of La Mirada.
- Water meter or service from the street: the provider on your water bill.
- Gas odor or meter: SoCalGas, or 911 if you smell gas.
- Contractor licenses: cslb.ca.gov.
Common questions
Are all homes here on slabs?
Slab-on-grade is common in La Mirada's tract neighborhoods, but check your own house; some homes may have raised foundations or additions built differently.
Will removing a tree stop root problems?
Not by itself. Roots already in the pipe remain, and the joints that let them in stay open. Repairing or lining the pipe is the lasting fix.
Who owns the lateral under the sidewalk?
Rules vary by city. Check with the City of La Mirada for your address.
General information for La Mirada, not a quote or professional advice. In an emergency, call 911.