Which part of a phospholipid faces toward the aqueous environment

Phospholipids have 2 faces or poles: one hydrophobic (the tails which "run away" from water) and one hydrophilic (the heads which "like" water).

This means that when in a double layer in a aqueous environment, the heads will face the water and the tails will face each other.

The phosphate heads are hydrophilic (water-loving) and the fatty acid tails are hydrophobic (water-hating).