Why Your Concrete Driveway Turns Black (and How to Fix It)

If your driveway has developed dark, blotchy staining, you're not alone. Black staining on concrete is one of the most common issues Ohio homeowners deal with, and it's very treatable.

What causes the black staining?

In most cases, black or dark green staining on concrete is caused by algae, mold, or mildew growing in the porous surface of the concrete, fed by moisture, shade, and organic debris like leaves and grass clippings.

Why it keeps coming back

Simply hosing off the surface doesn't remove the organic growth living inside the concrete's pores. Without treatment, it regrows quickly, especially in shaded or low-lying areas of your driveway.

How professional cleaning fixes it

A proper driveway cleaning uses a surface cleaner with commercial-grade pressure combined with a cleaning solution designed to break down organic staining at the source, not just on the surface.

Preventing it from returning

Annual cleaning, combined with keeping the area clear of leaves and debris, significantly slows regrowth. Sealing is also an option worth discussing for driveways prone to recurring staining.