What is the Rust Colored Stain On My Driveway and Sidewalk?

Residential driveway with stained and clean concrete sections.

An iron-oxidizing bacteria causes the rusty stain. You may find it ponding in low spots on your lawn and oozing from the ground after heavy rain during the summer. During the winter, a high water table can push it to the surface, where it can show for several days. These bacteria are naturally occurring microorganisms […]