City of Oak Creek addresses groundwater and drainage concerns for new housing developments

Concerns over groundwater management took center stage at the Oak Creek Plan Commission meeting on August 4, 2025, as developers addressed potential issues related to underground water and its impact on new residential construction.

During the meeting, a developer highlighted the historical context of a drainage ditch that has been in place for over 80 years, which has contributed to the area's wetland conditions. The developer explained that the existing infrastructure, including an 8-inch culvert, was inadequate for managing water flow, leading to the creation of a larger wetland area. To mitigate these issues, plans are in place to reroute water through a new system featuring two 36-inch culverts, significantly improving drainage capacity.

Addressing concerns about underground water levels, the developer confirmed that soil engineering studies were conducted to assess seasonal high groundwater levels. The findings indicated that groundwater is just below the topsoil, prompting plans to raise the building site by approximately six feet. This elevation aims to ensure that basement floors will be at least one foot above the seasonal high groundwater level, reducing the likelihood of sump pump usage and related issues.

While the city currently lacks specific ordinances regarding groundwater separation, the developer emphasized their commitment to responsible construction practices. They noted that many sites in Oak Creek are wet, but proactive measures are being taken to prevent future problems associated with groundwater.

The discussion underscored the importance of effective water management in residential development, particularly in areas with historical drainage challenges. As the project moves forward, the community will be watching closely to see how these measures address the longstanding issues of water management in Oak Creek.