# DC Cell + Copper Wire + Ground Water

DC Cell + Copper Wire + Ground Water produces bubbles from wire and water turns rust red gradually? What is happening?

I can see something is settling down...

Groundwater contain besides other things $\ce{Fe^2+}$ a lot of organic material Lenntech, Natural Variations in the Composition of Groundwater. Oxygen released during electrolysis denatures organic proteins and the $\ce{Fe^2+}$ oxidize to $\ce{Fe^3+}$ that resulting to the reddish colorization.