Quick answer
The short answer
A ground rod gives lightning, surges, and electrical faults a path to earth. Without it, faults can stay on metal parts of your electrical system—appliance cases, panel covers, water pipes—and energize anything they touch. Code requires either a ground rod, a metal water pipe bond, or both. Most homes need both.
What to know first
- Grounding sends faults to earth so they clear safely; bonding ties metal systems together so they’re at the same potential.
- NEC requires a grounding electrode system—usually two ground rods OR one rod plus a water pipe bond.
- Older homes are often missing or have corroded grounding electrodes—a common code-correction item.
What grounding does (and doesn’t) do
Grounding is a safety system, not a daily-use part of electricity. Under normal conditions, no current flows through the ground wire. The grounding system only matters when something goes wrong—a fault, a surge, lightning.
When a fault happens, the grounding system gives that fault current somewhere to go (the earth) so the breaker can sense the high current and trip. Without grounding, that fault stays "live" on metal parts of the system.
Why bonding matters as much as grounding
Bonding ties metal systems together—water pipes, gas lines (where required), HVAC ducts, sub-panels—so they’re all at the same electrical potential. If one becomes energized, the bond ensures all of them rise together, and the fault current has a clean path back to the panel.
A common older-home defect: the ground rod is fine, but the water pipe bond was never installed. The fix is a single short jumper—but it’s code-required and it really matters.
How we check it
We measure ground resistance with a clamp meter or fall-of-potential test. We visually inspect the bonding jumpers at the panel, water heater, gas (where applicable), and any sub-panels. Any obvious corrosion, missing bonds, or undersized conductors get documented.
For older homes selling on the market, we provide written documentation of what’s been done and brought to code—which usually clears inspection items in one pass.
Grounding electrode options
Most homes use a combination, not just one.
| Type | How it works | Required by code? |
|---|---|---|
| Ground rod (8 ft) | Driven into earth near service | Yes—usually 2 needed unless first tests <25 ohms |
| Metal water pipe bond | Bonded to first 5 ft of buried metal water pipe | Yes if metal water service exists |
| Concrete-encased electrode (Ufer) | Rebar in foundation | Yes for new construction since 2008 |
| Plate or ring electrode | Buried plate or ring around foundation | Allowed alternatives |
Related next steps
If this sounds like what you are dealing with, these service pages explain the next step.
Frequently asked questions
Do I really need two ground rods?
Code requires two unless the first one tests below 25 ohms (rare in dry soil). Most installs end up with two.
Can I drive a ground rod myself?
Physically yes, but the bond at the panel and the conductor sizing have to be code-correct. The rod is the easy part.
Will a ground rod stop power surges?
It’s necessary for surge protection but not sufficient by itself. You also need a whole-home surge protector at the panel.
How long do ground rods last?
Galvanized rods 30+ years; copper-clad even longer. The connection at the panel is usually what fails first—corrosion at the clamp.
Work with our team
Call (661) 293-0213 or use the contact form.
