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Ground Water Management

The Ground Water Management (GWM) Section is responsible for managing and protecting the ground water resources of Baltimore County. GWM handles issues related to drinking water wells, on-site sewage disposal (septic) systems, removal of residential underground storage tanks, and disposal of solid and hazardous wastes.


Well Water Testing

Prior to putting any new well into service, the well must be issued a Certificate of Potability (COP) by the Department of Environmental Protection and Sustainability (EPS) after verification that the water supply meets the mandated testing standards required by state regulations (i.e., the water must be analyzed for bacteria, nitrates, turbidity and sand). Once the COP has been issued, the responsibility of maintaining and testing private water supplies is up to the property owner. EPS staff is available to help troubleshoot any water quality concerns that you may have. A list of private laboratories who can assist you with water testing can be found in our list of Certified Water Testing Labs (PDF).

Investigations and Claims

Underground tank that is deteriorating being replaced.
Underground tanks deteriorate over time and
eventually need to be replaced.

If you are interested in finding out information about ongoing investigations involving petroleum contamination of ground water in Baltimore County, view the Maryland Department of the Environment's Oil Control Program Remediation Sites.

Road Salt Related Claims

Baltimore County is no longer processing new claims for home well water contamination alleged to be caused by road salt application. Homeowners who require help or advice with this matter are encouraged to contact and work with a well drilling or water treatment company.

Revised October 19, 2020         
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Environmental Protection and Sustainability

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