Tests show Pine Flat Lake algae bloom has subsided

Published Aug. 10, 2018

SACRAMENTO, California The Central Valley Water Board has completed a third round of testing for toxins at the U.S. Army Corps of Engineers Sacramento District’s Pine Flat Lake.

     Five locations sampled within Pine Flat Lake reveal that conditions of the lake are improving and no cyanotoxins were found to be present. There has also been a noticeable change in water color, with no visible surface scum and no distinct green particulate matter in the water.

     Cyanobacteria was found to be present in the lake in mid-June following water testing by the CVWB. Its presence can lead to the production of toxins in the water, however, toxin levels have NOT been detected in any of the recent water samples from Pine Flat Lake.


For current information on the algae bloom, check our Pine Flat Lake web page at



Pine Flat Lake is located 35 miles east of Fresno in the foothills of the Sierra Nevada mountain range. The U.S. Army Corps of Engineers is among the nation's leading federal providers of outdoor recreation with more than 5,000 recreation sites at 403 lakes and river projects located in 43 states.

J. Paul Bruton

Release no. 18-016