There are a number of reasons you may experience an earthy/musty taste or smell:
Algae
Occasionally, algae in Seqwater dams can increase to the point where taste may be affected. Seqwater do their best to remove these in the treatment process, however, some residents may still notice a faint taste or odour.
The water is safe to drink but, if you don't like the taste, you could also install a water filter on your tap. These are available from plumbing suppliers.
If you have noticed the earthy/musty taste or smell has increased dramatically, please phone Redland City Council on 07 3829 8999.
Breakdown of above ground plastic pipes
If you have above ground plastic pipes on your property, the plastic may break down over time causing taste issues. Your plumber will be able to inspect the pipes for you.