Wayland Patch 5/31/12: Board of Health Discusses Sodium, Chlorine in Wayland's Water. Sodium levels in Wayland's drinking water this year have tested high enough to raise concerns for the town's Board of Health. The tests of the highest concern are those from the town's two Happy Hollow wells, which showed sodium levels at 63 and 72 parts per million in February tests. Currently, levels above 20 ppm are required to be reported. Wayland's Department of Public Works Director Don Ouellette said the level of sodium in Wayland's drinking water isn't necessarily unusual for New England towns, and the DEP is even expected to raise the threshold in the near future.