What is cathodic protection and how does it prevent corrosion?
Cathodic protection stops the corrosion of cast iron water mains by redirecting corrosion forces from the iron water main to a sacrificial zinc bar called an anode. We install anodes each time we repair a water main break. We also install them as part of an ongoing program to protect several blocks of pipes at a time. We spend $6.5 million on our annual water main renewal program and cathodic protection program.
