Sanitary Engineering Notice

Permit Center services are being conducted by appointment.
For more information, call Perc Testing: 410-222-7193,
Septic Installations: 410-222-7194 or Water Wells: 410-222-7398.

Wet Season Percolation Testing

2022 Wet Season Perc Testing Announced

Sanitarian measure different layers of soilMarch 21, 2022 – The Anne Arundel County Department of Health, Bureau of Environmental Health, will start annual wet season site evaluations and percolation tests on March 22, 2022.  Wet season testing is arranged on a first-come, first-serve basis.  Appointments for wet season testing are being accepted and applicants are encouraged to submit wet season applications as early as possible so that each site may be properly evaluated for sewage disposal systems.  For the 2022 testing season, testing for mound sewage disposal systems will not be possible.  Mound testing will be deferred until 2023.  All applications for testing must be received and scheduled by April 1, 2022.  To apply for percolation tests, contact the Bureau of Environmental Health of the Anne Arundel County Department of Health at 410-222-7193.  You may apply online at

The wet season test period is set for Anne Arundel County by using data from a network of monitoring wells to determine groundwater levels.  Properties located in areas with certain soils and high-water tables require testing during this season of the year.  The highest water table is usually experienced during the months of February, March and April.  If water levels fall quickly, wet season testing could be ended prior to the normal closing date of April 30.

Wet season testing helps avoid inaccurately assessing the ability of the septic system to work in all seasons of the year.  The information provided by the site evaluation and perc testing is used to determine the size and type of septic system that can be installed on a specific lot.   Factors such as slopes or adjacent wells can reduce the space available for a septic system.  In addition, adequate land must be set aside for at least two future replacement systems.  Depending on the results of the evaluation, this may mean reducing the size of the house and the size of the septic system to meet requirements.  In some cases, because of adverse soil or groundwater conditions, a property may only be developed when public sewer is available.

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