The Romans were master engineers when it came to moving water. Aqueducts, constant flow sewerage, etc.
They even invented lead pipe. Lead, which is poisonous, leached out into the drinking water.
Some say this contributed to a collective insanity among the ruling class, who enjoyed the very best in running water technology.
utter nonsense/ read the history.
But the water ran constantly in Roman systems, so the possibility of a significant accumulation of lead was practicaly nil.