Water Testing

Links to the latest Lake Beulah water quality reports are listed below. The bottom line is that the lake quality is considered: GOOD.



One measure of a lakes health is the trophic state, which relates to the amount of algae in the water. The average summer trophic state for the last 5 years was 45 (Mesotrophic) and was determined using chlorophyll data. For a “Two-Story” lake, this is considered Good.

  • Mesotrophic - Mesotrophic lakes are characterized by moderately clear water but have an increasing chance of low dissolved oxygen in deep water during the summer.

Lake Beulah has been monitored by volunteers since 1991. Volunteers monitor water clarity with a black and white Secchi disk. Some also collect water samples, which are sent to the State Lab of Hygiene to be analyzed. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Additional monitoring has been done through projects funded in part by DNR Lake Grants and Aquatic Invasive Species Grants. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.


WI DNR External Links

STATION NAME LINK (Date of Last Report)


Secchi Testing

Every year, volunteers collect water samples using Secchi Disk readings from lakes in Wisconsin. This data is calibrated with a mathematical model and satellite imagery to achieve the most accurate readings of water quality on over 8000 lakes in the state.

The Wisconsin DNR uses data from both the Landsat 5 and Landsat 7 satellites; volunteers schedule their testings based on the day that the satellite passes overhead.

Check out this Wisconsin Citizen Lake Monitoring Training Manual (PDF pages 26-28) to see the 13 Steps that LBPIA Board Member Keith Beren takes to monitor the water clarity of Lake Beulah.

2017 Water Quality Report.jpg

Questions? Contact Keith Beren