There can be. When water stands for several hours in plumbing systems that contain lead, the lead may dissolve into your drinking water. If your home was built before 1986, it may have copper pipes with lead solder. In addition, any faucet purchased before 1997 may be constructed of brass containing up to 8% lead. More recent federal legislation has mandated, as of January 4, 2014, that all pipe, fittings, and fixtures may contain no more than 0.25% lead.