SALISBURY, Md. (AP) — An annual study of pollution levels in the Wicomico River and its watershed shows that levels went down slightly in 2011.

The Daily Times in Salisbury reports that results from the Wicomico Creekwatchers’ 2011 Water Quality Monitoring Results were mixed.

READ MORE: Biden, Lawmakers Pay Tribute To Slain Capitol Police Officer William 'Billy' Evans

Creekwatchers supervisor Judith Stribling says water clarity went down substantially, which she attributed to low rainfall. That keeps the river from flushing out and promotes algae growth.

READ MORE: COVID In Maryland: More Than 1K New Cases Added As Hospitalizations Continue To Increase

The river is listed as an impaired body by the U.S. Environmental Protection Agency, The results come as Salisbury enters the first phase of a plan to clean up the east prong of the river.

Stribling says the biggest improvement in water quality will come when the city of Salisbury completes improvements on a faulty wastewater treatment plant.

MORE NEWS: Maryland Directs All Vaccine Providers To Pause Johnson & Johnson Shot In Light Of Clot Reports

(Copyright 2012 by The Associated Press.  All Rights Reserved.)