New Berlin (/nuːˈbɜːrlɪn/) is a city in eastern Waukesha County, Wisconsin, United States.

The town remained a rural and agricultural area until the 1940s, when the westward migration to the suburbs from Milwaukee began.

[6] Large-scale growth occurred in the 1960s and 1970s, mainly as a result of the construction of the New Berlin Industrial Park, which began in 1964.

This resulted in around 300 students being transferred to either Elmwood, Ronald Reagan, or Orchard Lane elementary schools before the Fall term in 2012.

[9] Interstate 43 was expanded at the Moorland Road exit to accommodate a growing number of commuters.

The new interchange has a two-lane roundabout that has been the center of a great deal of controversy because of the high number of accidents and traffic backups on 43.

Nearly 27 square miles (70 km2) in the western part of the city, or about 73% of the city's total land area, is west of the Sub-Continental Divide in the Fox River watershed, which is part of the Mississippi River watershed.

[13] Michael Joseph Gross of GQ said that "On the map, New Berlin forms a neat six-by-six-mile square in the southeast corner of Waukesha County".

The spill was caused by employees attempting to move a 350-gallon oil storage tote that became damaged in the process.

The oil then entered the city's stormwater system, a retention pond, and the creek behind the homes along Mark Drive.

The property owner did not report the spill to the city or the Department of Natural Resources, as required by law.

[23] The eight-member Common Council consists of seven aldermen, representing each of the city's seven aldermanic districts, and the mayor.

In the eastern portion of the city, wastewater is returned to Lake Michigan via the Milwaukee Metropolitan Sewerage District sewer system.

The western portions of the city, outside of the Utility Service Area, use groundwater/private wells as their water supply source.

The groundwater acquired from these wells is found in two distinct shallow water bearing geologic formations, or aquifers.