The 10th Street Site sits in south-central Columbus, Nebraska. It was placed on the National Priorities List (NPL) in August 1990 after volatile organic compounds (VOCs) showed up in municipal drinking wells. The site covers two main areas, called operable units: a South area (OU 01) and a North area (OU 02). Cleanup of OU 01 was completed in 2003. Work on OU 02 has been more involved and is still active.
The main contaminants are tetrachloroethylene (PCE) and trichloroethylene (TCE), both linked to former dry cleaning businesses at three locations. Other contaminants found in groundwater and soil include trichloroethane compounds, dichloroethane compounds, chloroform, bromodichloromethane, dibromochloromethane, toluene, arsenic, cadmium, barium, and vanadium. These substances posed risks through drinking water exposure, skin contact, and vapor intrusion into homes and businesses. The municipal water supply serves about 20,000 people and consistently meets Safe Drinking Water Act limits.
Cleanup actions have included vapor and groundwater extraction, groundwater treatment, chemical oxidation, excavation of contaminated soil, and off-site disposal. The EPA bought four properties at source areas, demolished buildings, and restored the land. Three of those parcels have been transferred to the state of Nebraska and sold to private buyers. Institutional controls recorded in September 2020 restrict land uses such as residential development and prevent groundwater consumption in contaminated areas. Vapor sampling in 2017 confirmed indoor air at residences was safe.
Low levels of VOC contamination remain in groundwater near the former One Hour Martinizing property at Highway 30 and 25th Avenue. The EPA is conducting a Focused Feasibility Study to determine the best approach for that remaining contamination. The study is expected to be complete in 2027. The Nebraska Department of Environment and Energy (NDEE) conducts annual groundwater sampling at the site. The five-year review completed in July 2025 is the most recent. Human exposure is under control, and the site is considered ready for anticipated reuse.
Community members can stay informed by contacting the EPA's Community Involvement Coordinator or the Remedial Project Manager. The City of Columbus Public Works Department also provides information about public water supply testing. The NDEE handles ongoing monitoring and can answer questions about groundwater sampling.
