Although there are two freshwater sources that are drained into the beach, the water quality at the beach does not seem to be seriously affected, possibly because the wastewater from most of the residential areas in the hinterland is discharged after chlorination. However, salinity is still found to be a good indicator on beach pollution. Interestingly, Cheung Sha Lower, together with its neighbouring beach Cheung Sha Upper, are the only two beaches in Islands district that show a significant correlation between beach water quality and tide level.

Monthly distribution of beach gradings at Cheung Sha Lower beach (2010-2014)