8.08 liters.
To find the volume of each water sample, we need to divide the total volume of water collected by the number of samples collected.
Volume of each water sample = Total volume of water collected / Number of samples collected
We are given that the total volume of water collected is 606 liters, and the number of samples collected is 75.
Volume of each water sample = 606 / 75
Volume of each water sample = 8.08 liters
Therefore, the volume of each water sample is 8.08 liters.