A laboratory study was conducted to test the leachability of regulated metals from cement-mortar linings inside drinking water pipes. Faucet water with a known quality was introduced in the test pipes and maintained in static, pressurized conditions for extended periods of time. Water samples were frequently drawn from the pipes and tested for metals and other water quality parameters during the test periods. Significant amounts of barium, cadmium, and chromium leached out from the cement-mortar linings in two of the three test pipes during the first 14 days of water stagnation. Barium and chromium continued to leach out at detectable levels in the subsequent refills of pipe water. High pH and calcium carbonate saturation index in the test pipe water may have retarted the metal leaching. The water industry is recommended to be selective in choosing cement for lining pipes.