Pennsylvania American Water Company

Occurence of Trihalomethanes in the Nation's Ground Water and Drinking Water Supply Wells, 1985-2002 / United States Geological Survey

Lead isn't the only potential water contaminant Pittsburgh residents should worry about, according to researchers at the nonprofit Environmental Working Group.

The Washington, D.C.-based research and lobbying group this week launched a website that allows residents to look up which contaminants are present in the local drinking water supply, at what levels they exist and how those levels compare with state and national averages.

If the Pennsylvania American Water Company receives approval by the Pennsylvania Public Utility Commission (PUC), the water you use could cost you an extra $6.12 a month.

The company is in the process of increasing its rates for 2014.

Company spokeswoman Josephine Posti said the average customer uses 3,900 gallons of water a month.

Posti said the rate increase is to recover the cost of system upgrades since 2011.