Why is iron used in water pipes?

Iron is used in water pipes primarily due to its strength, durability, and resistance to pressure, making it suitable for transporting water effectively. Cast iron, in particular, has Excellent corrosion resistance and can withstand harsh environmental conditions. Additionally, iron pipes are cost-effective and have a long lifespan, which makes them a popular choice for municipal water systems. However, it's important to note that modern materials like PVC and HDPE are also commonly used due to their lightweight and corrosion-resistant properties.