LINCOLN, Neb. (AP) — Lincoln’s annual water report card shows the city has clean drinking water, but the arsenic level is increasing.

The arsenic sample from one field well was just below the federal limit. The city had no violations of federal contaminant levels.

Lincoln Water System officials plan to study the issue in what some city leaders call an abundance of caution.

The report says Lincoln’s drinking water contains very small amounts of lead and copper, far below any risk level. Lincoln water users will get a notice of the annual report in their next bill, with instructions on how to access the full report online.