The Secchi Disk

Secchi DiskContents

What is a Secchi Disk?

What (or who) is a “Secchi”?

Why are many disks black and white?

Considerations in Secchi Disk Design

Using a Secchi Disk (Procedural Considerations)

Examples of Methods Used by Monitoring Programs in the U.S.

Evaluating Eutrophication by Secchi Depth

Purchasing a Secchi disk

Making your own disk

Secchi Records


Other Secchi Disk Resources

If you would like more information on using the Secchi Disk or on volunteer monitoring, the EPA maintains an online Volunteer Monitoring Manual. Be sure to check out this site if you are considering monitoring your lake.