Can freshwater have a small amount of salt in it?

Yes, freshwater can contain a small amount of salt, which is often referred to as brackish water when the salinity is higher than that of freshwater but lower than that of seawater. This can occur in areas where freshwater mixes with seawater, such as estuaries or coastal regions. Additionally, natural processes like the dissolution of minerals can introduce small amounts of salts into freshwater sources without significantly altering their classification.