May be associated with the presence of sodium in drinking water when present in high concentrations. Often from saltwater intrusion, mineral dissolution, industrial and domestic waste. Deteriorates plumbing, water heaters, and municipal water-works equipment at high levels.
Cost basis is the original price paid for shares of a security plus or minus certain adjustments required by applicable tax rules such as adjustments with respect to reinvested distributions and sales charges.
For inherited stock: Generally, if you've inherited stock, your cost basis is the price of the shares on the date of the death of the person who left the shares to you. In the case of a gift, your cost basis is the same as the cost basis of the person who gave you the shares.