What Is an Anode Rod and Why Does Your Water Heater Have One?
Every tank water heater contains a magnesium or aluminum anode rod — a sacrificial metal rod that corrodes in place of the steel tank walls. This rod is the primary reason a tank water heater can last 10–12 years instead of rusting out in 2–3 years. As long as the anode rod is intact, it attracts corrosive elements in the water. When the rod is fully consumed, the tank itself begins to corrode — leading to leaks, rust-colored water, and tank failure. Replacing the anode rod every 3–5 years can literally double the lifespan of your water heater.
Why LA Homes Are Especially Hard on Anode Rods
Los Angeles has notoriously hard water — typically rated 'very hard' at 250–450 mg/L of calcium carbonate. This high mineral content dramatically accelerates anode rod consumption. In standard US water conditions, an anode rod might last 4–6 years. In LA hard water conditions, the same rod may be fully consumed in 2–3 years. If you've never had your anode rod checked and your tank is over 4 years old, it very likely needs replacement.
Signs Your Anode Rod Has Failed
Warning signs that your anode rod has been consumed: rotten egg or sulfur smell from hot water (a reaction between depleted anode and sulfate-reducing bacteria in the water), rust-colored or discolored hot water, and a water heater that is 6+ years old and has never been serviced. At this point, the tank itself is being corroded and lifespan is reduced significantly.
Anode Rod Replacement: Cost and What to Expect
Anode rod replacement in Los Angeles typically costs $150–$300 for the service call plus the replacement rod. Given that a new water heater costs $1,200–$2,400+, a $200 anode rod service that extends tank life by 3–5 years is an exceptional value. Plumbing 405 includes an anode rod inspection with every water heater service call. If you're due for replacement, we handle it on the same visit.