Abstract: A system for measuring a concentration of lead in water includes a variable electrode having a mixture of lead ionophore II, carbon nanotubes, and a first binder. A reference electrode includes a mixture of carbon nanotubes and a second binder. A meter is electrically connected in series with the variable and reference electrodes, and the meter generates a signal reflective of the concentration of lead in the water when the variable and reference electrodes are immersed in the water. A method for measuring a concentration of lead in water may include preparing a variable electrode having lead ionophore II and a reference electrode having carbon nanotubes. The method may further include electrically connecting a meter with the variable and reference electrodes, immersing the variable and reference electrodes in the water, and generating a signal from the meter reflective of the concentration of lead in the water.