Lake Onega water per year, of which 46% are industrial and household water, 25% is stormwater runoff and 16% is melioration-related drainage. This drainage contains of phosphorus and of nitrogen; respectively of these elements are removed through the River Svir whereas the rest accumulates in the lake. Ships and motor boats (about 8,000 units) bring oil pollution at the level of about per navigation year, as well as phenols (), lead () and oxides of sulfur, nitrogen, and carbon. The lake basin is a major source of granite, marble and black schist in Russia which have been exploited in the area since
Echo Lake Country Club engaged Donald Ross to design the current course which was completed in 1913. The clubhouse was built on a high bluff overlooking Echo Lake. In 1921, the Cranford Golf Club and the Westfield Golf Club merged, choosing the name Echo Lake Country Club to reflect both the site, along the upper reaches of the Rahway River Parkway, and the broad country club activities offered. The club has hosted two national championships conducted by the United States Golf Association: Echo Lake Country Club Echo Lake Country Club is a private, member-owned country club located in Westfield, New Jersey. The club was