What is the level of hexavalent chromium (chromium-6) in my water?
The laboratory results show chromium-6 levels in the finished water to be 0.23 ppb (parts per billion). The results seem to be consistent with results reported from other nearby communities (Chicago and Evanston). Currently there is no maximum limit for chromium 6, but there is for total chromium, which chromium-6 is a sub-specie. The level detected in Wilmette is 99.77% below the total chromium regulation of 100 ppb and 99.5% below the more restrictive California total chromium limit of 50 ppb.
