July 2015

Volunteers have been submitting information during the annual Dip-In snapshot since 1994. Please join them in this international effort to track changes in water quality!

Photos: Maya Hughes (Ohio Sea Grant), US Army Corps of Engineers, Ohio Sea Grant, ChesapeakeBayEO

Photos: Maya Hughes (Ohio Sea Grant), US Army Corps of Engineers, Ohio Sea Grant, ChesapeakeBayEO

The Concept of the Dip-In is Simple

The Secchi Dip-in enables volunteers to collect water clarity data in the USA and Canada.

Individuals in volunteer monitoring programs take a transparency measurement on one day during the month of July. Individuals may be monitoring lakes, reservoirs, estuaries, rivers or streams. These transparency values are used to assess the transparency of volunteer-monitored waterbodies in the United States and Canada. When 5 or more years of data have been gathered on a site, it is used to determine trends. Over 2,000 waterbodies are now tracked for trends in transparency.

We accept data from any year. If you weren’t able to enter your data from a previous Dip-In, you may still add that data. We also accept data from any date during the year. We welcome small programs to use our database as a data depository.


Lake_George_WHow To Participate
Click here for instructions to volunteers and program coordinators.
laketestsView Dip-In Data
Enter as a Guest and see how lakes in your area compare. Register to add or edit data.

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