
Below 15, the level that requires action
2 public water companies list Naper as a place they supply. The biggest is Naper's water department, with about 100 people. The highest latest result among Naper's water companies is 0.5 parts per billion, at Naper's water department. None of the 2 with results was above 15 at its latest test. 1 found too little lead to measure.