Jackson is stepping-up its water testing because of the crisis in Flint.
The city will now check lead levels every year instead of every three years.
It will also test twice as many homes as the Environmental Protection Agency requires.
Around 80% of homes tested in Jackson have lead water line or some sort of lead components.
But a city spokesman says the water has never exceeded EPA limits for lead or copper since testing started in 1992.
People in Jackson can get a home testing kit from a hardware store or by calling the county health department.