The El Dorado Water Agency (EDWA) held its first-ever regional plenary on Thursday, October 23 to hear from water experts in Tahoe about what the issues are and what can be done to solve them. … One of the major points of discussion was tetrachloroethylene pollution, also called PCE pollution, which affected wells at the Y in past years, and continues to affect other systems through a 400-yard plume. While the drinking water in Tahoe is safe, controlling and preventing PCE contamination is something that water suppliers are prioritizing.