Recent news articles have focused on strontium levels in drinking water. It is important to understand this affects ground water supplies, which are in close contact with subsurface rock that has strontium in it. The Sheboygan Water Utility takes water from Lake Michigan, which is not in contact with subsurface rock. Strontium is currently not a regulated substance, but the Utility tested for it in 2014. The result was 120 parts per billion. The strontium levels of concern for ground water supplies are typically four thousand times higher than that level.