Lead
Lead in drinking water is a serious health hazard, particularly for children and pregnant women. The EPA recommends keeping lead levels below 15 parts per billion (ppb), though ideally, there should be none.
Optimal
Lead levels are at or below 1 ppb, ensuring safe drinking water.
Cautionary
Lead levels between 2-14 ppb indicate some contamination, requiring filtration or investigation into plumbing materials.
Hazardous / Out of Range
Lead levels at or above 15 ppb pose a serious health risk, necessitating immediate mitigation measures such as replacing plumbing components or using certified filters.