In short
- 2026 Code: using municipal metal water distribution piping as a new grounding electrode is prohibited. This is a Québec amendment.
- According to the RBQ, municipalities are gradually replacing metal pipes with plastic: continuity to ground is no longer guaranteed, even if the piping inside the house is metal.
- Before, according to the RBQ, a buried metal water pipe at 600 mm and at least 3 m long was traditionally considered a suitable grounding electrode.
- A rod electrode has two rods at least 3 m apart, driven their full length; a plate or a 6 m bare copper wire is buried at least 600 mm deep.
- The metal water piping inside the house must still be bonded: it no longer serves as a grounding electrode, but it protects people.
In this guide
What the 2026 Code changes
The Québec Construction Code, Chapter V (Electricity), 2026 edition, adds a Québec-specific rule (section 10-102, subsection 6): it is prohibited to use municipal metal water distribution piping as a new grounding electrode.
Why? According to the RBQ, municipalities are gradually replacing metal pipes with pipes that do not conduct electricity. Electrical continuity to ground is therefore no longer guaranteed, for several reasons:
- the line has been replaced, in whole or in part, with PVC, HDPE or another plastic;
- an insulating section was installed during a repair or rehabilitation work;
- a dielectric fitting;
- the owner has neither the information nor any control over the continuity of the municipal system.
Even if the piping inside the house is metal, nothing guarantees the connection to ground.
What already existed
According to the RBQ’s quality control guide (October 2023, based on the 2018 edition of the Code), buried metal water distribution piping, 600 mm below finished grade and at least 3 m long, was traditionally considered a suitable grounding electrode. The grounding wire was attached as close as possible to the water entry, with a bolted clamp, and a bonding jumper kept continuity around the water meter, a valve or a fitting that can be removed.
The 2026 Code targets new grounding electrodes. Your master electrician determines, under the edition that applies to your work, whether a new grounding electrode is required, for example during a service upgrade.
Grounding, bonding, equipotential bonding
Three different things, which the RBQ clearly distinguishes in its explanatory guide:
| What | What it does, according to the RBQ |
|---|---|
| Grounding | Stabilizes the voltage relative to the ground, dissipates transient overvoltages, references the installation to earth potential |
| Bonding | Gives fault current a low-impedance path, so the breaker trips |
| Equipotential bonding | Protects people by bringing the metal objects you can touch to the same potential |
What replaces the water pipe
The 2026 Code recognizes these grounding electrodes (section 10-102):
| Grounding electrode | What the Code requires |
|---|---|
| Rod | Two rods at least 3 m apart, connected by a grounding conductor and driven their full length; a single rod if it is chemically charged |
| Plate | In contact with the soil at least 600 mm deep, or embedded in the bottom 50 mm of a concrete footing |
| Field-assembled | A bare copper wire at least 6 m long, embedded in the bottom 50 mm of a concrete footing or buried at least 600 mm deep |
| Pre-existing | Existing infrastructure that offers, at least 600 mm deep, the same contact surface with the earth as a similar manufactured electrode |
The other change to this section, according to the RBQ: it clarifies that a chemically charged electrode is driven the full length of the rod.
The water piping stays bonded
No longer serving as a grounding electrode does not mean being disconnected. Under the 2026 Code (section 10-700), these parts must be made equipotential with the electrical installation:
- the indoor water distribution metal piping;
- the continuous metal drain piping;
- the continuous metal gas piping.
The RBQ specifies that the connection is made past the meter, the main valve and the other parts that can break continuity, in an accessible and visible location, not necessarily at the water entry. A dielectric fitting, installed as close as possible to the water entry, separates the house’s piping from the outside piping. Until the next revision of the Plumbing chapter of the Code, the RBQ allows it to be left out if the water system is made equipotential; it is not required if there is no metal piping in the building.
When to have it checked
- The city or a plumber replaced the water service line with plastic.
- You are changing the electrical service or the panel: see Upgrading from 100 A to 200 A and Replacing your panel.
- A pre-purchase inspection report mentions grounding: see Pre-purchase inspection.
- You are building: the grounding electrode is planned before the footing is poured. See New house.
According to the RBQ, this work must be done by a contractor holding the appropriate licence, even in your own home. Never disconnect the grounding wire attached to the piping. See what you can do yourself.
With LTE Électrique
- Master electrician, CMEQ member, RBQ licence 5874-5597-01.
- We check the grounding and the piping bonds during an electrical inspection or a service upgrade, and we install the required grounding electrode.
- Price given upfront, fixed or hourly depending on the project; 2-year labour warranty.
- Free estimate within 24 hours: send us a photo of the grounding wire where it is attached, and a photo of the panel with the door open.
Frequently asked questions
- What does grounding do?
- According to the RBQ, the grounding conductor mainly stabilizes the voltage relative to the ground, dissipates transient overvoltages and references the installation to earth potential. It is bonding, another conductor, that makes the breaker trip during a fault.
- My house is grounded through the water service: is that still allowed?
- The 2026 Code prohibits using the municipal water system’s metal piping as a new grounding electrode. According to the RBQ, this method was historically accepted, but it no longer offers enough reliability. Your master electrician determines, under the Code edition that applies to your work, whether a new grounding electrode is required.
- The city replaced the water line with plastic: what should I do?
- Have the grounding checked. According to the RBQ, a line replaced in whole or in part with plastic, an insulating section installed during a repair, or a dielectric fitting breaks electrical continuity: even if the piping in the house is metal, nothing then guarantees the connection to ground.
- What replaces the water pipe?
- A grounding electrode recognized by the Code: two rods at least 3 m apart and driven their full length, a plate buried at least 600 mm deep, or a bare copper wire at least 6 m long embedded in the concrete footing or buried at least 600 mm deep. If rock prevents reaching the required depth, the Code allows an acceptable lesser depth.
- Does the water piping still need to be bonded?
- Yes. According to the RBQ, the metal water piping inside the building must be made equipotential with the bonding system. The goal is not to use it as a grounding electrode, but to prevent a dangerous difference of potential between the piping and the other metal parts of the house.
- What is a dielectric fitting?
- An insulating fitting installed as close as possible to the water entry, which separates the house’s metal piping from the outside piping. According to the RBQ, until the next revision of the Plumbing chapter of the Code, it may be left out, as long as the water system is made equipotential. It is not required if there is no metal piping in the building.
- Can I redo the grounding myself?
- No. According to the RBQ, work on an electrical installation must be done by a contractor holding the appropriate licence, even in a home you live in. Do not disconnect the grounding wire attached to the piping.
Sources
- Cahier explicatif sur les principaux changements au chapitre V, Électricité (édition 2026), articles 10-002, 10-102 et 10-700PDF, Régie du bâtiment du Québec, checked on November 3, 2026
- Guide d’accompagnement : contrôle de la qualité des travaux d’installation électrique (octobre 2023), vérifications 1.21 à 1.23PDF, Régie du bâtiment du Québec, checked on November 3, 2026
- Modifications réglementaires en électricité, Régie du bâtiment du Québec, checked on November 3, 2026
- Prolongation de la période transitoire en électricité (2 septembre 2026), Corporation des maîtres électriciens du Québec, checked on November 3, 2026
- Travaux que vous pouvez faire vous-même, Régie du bâtiment du Québec, checked on November 3, 2026
About this guide
Written by LTE Électrique, a master electrician’s business in Sherbrooke (RBQ licence 5874-5597-01, CMEQ member). Every rule comes from Québec’s Construction Code or an official source, listed above with the date it was checked.
About usCite this guide
To cite this guide, use its title, author and address:
“Grounding and a plastic water line: what the 2026 Code changes”, LTE Électrique, https://www.lteelectrique.com/en/guides/grounding-plastic-water-service-line.