Many Duluth homes have old water delivery pipes made out of lead.
One local company that tests for lead in your drinking water is ERA Labs located in West Duluth. Pay in advance for the test when you pick up a sampling container, then return the filled container to have your water analyzed for lead.
Whether you have your water tested or not, if you live in an old home, you should not drink water that has sat in the pipes overnight or longer. Run the faucet for 1-3 minutes (depending on how far your home sits from the city water mains) to remove water that may have accumulated lead.
You can check whether you have a lead delivery pipe by calling the City building and permits office.