The commissioners amended the county's water and sewerage master plan yesterday to include the disposal of sewage from Francis Scott Key High School, a necessary step for state approval to operate the school's treatment plant.
The amendment outlines plans to use the $786,000 wastewater treatment plant - which was built in 1998 without the required construction and environmental permits - and discharge the treated waste onto a wetland on an adjoining property or release it directly into a nearby stream.
It was not clear yesterday which option the county would pursue.
Doug Meyers, Carroll's acting public works director, told the commissioners he is waiting for direction from the Maryland Department of the Environment.
The state agency issued a draft of a permit the county needs to move forward with the long-delayed wastewater treatment project, but a number of other steps - including additional public hearings and likely appeals - must be completed before the required permits are issued.
In other business, the commissioners agreed yesterday to seek proposals for a study of the transportation needs of Westminster.
They also agreed to schedule a public hearing on a proposed zoning amendment that would allow county residents to create and rent "in-law apartments" to nonfamily members.