Rust in water: dangerous or not?

How does rust form in drinking water? 

Rust is a product of corrosion. It is created by the oxidation of iron or steel in the presence of water . The oxygen in the water reacts with the iron in the pipes, creating iron hydroxide, which deposits on the walls of the pipes. This iron hydroxide further reacts with the oxygen in the water and ultimately rust forms. If the rust formation is a little more advanced, the rust particles come loose and get into the water. The result is brown tap water. 

The causes of rust in water are varied. This process most often happens with galvanized iron or steel water pipes . Because over the years, the protective zinc layer wears down and is removed. This exposes the underlying iron and the pipe begins to rust. Old cast iron water pipes or pipes made of mixed materials are equally susceptible. 

But prolonged stagnation or high temperatures can also stimulate rust formation. Particular caution is required if you supply water from your own well, as this can also lead to rust in the water. Short-term rust water can also occur during maintenance work on the drinking water pipes or pressure fluctuations in the pipes. 

Causes of rust in water

• poorly galvanized steel pipes
• natural erosion of the zinc layer over time
• old cast iron water pipes
• Mixed materials pipes
• long periods of stagnation 
• high temperatures 
• Water supply from your own well
• Maintenance work on the drinking water pipes
• Pressure fluctuations in the line