Neither Allen nor NTMWD water transmission and distribution systems have components containing lead. The NTMWD water that comes to Allen does not flow into the water systems of any other cities. So although other cities may have pipes containing lead, it cannot get into either NTMWD or Allen’s water distribution system.
The most common way lead enters drinking water is through brass or chrome-plated brass faucets and fixtures with lead solder. Significant amounts of lead can enter the water through these fixtures, especially through hot water. Although lead-free solder has been required for many years, homes built before 1986 are more likely to have lead pipes, fixtures containing lead or pre-1986 lead containing solder.