MILWAUKEE, Wis. (WTAQ) - Wisconsin’s largest metro is dealing with sewage overflows, in the wake of the overnight storms that dumped up to 4 inches of rain on parts of Metro Milwaukee.

The sewerage district said the main parts of the area’s Deep Tunnel sewers were at almost 99 percent of their capacity by 9 a.m. Thursday. District director Kevin Shafer ordered the closings of connecting gates, which cause overflows into local streams and rivers to prevent flood waters from getting into people’s basements.

But in the meantime, most of the wastewater still heads to Milwaukee’s 2 sewage treatment plants. 28 Metro Milwaukee communities are affected.