Leonardtown, MD – The St. Mary’s County Health Department (SMCHD) will suspend wet season perc testing effective May 9, 2025, due to declining groundwater levels observed in the county’s network of monitoring wells. The decision, announced on May 7, 2025, aims to ensure accurate evaluations for septic system installations, which rely on adequate groundwater conditions during the wet season.
Perc testing, or percolation testing, assesses soil’s ability to absorb water, a critical step for approving septic systems in areas without public sewer access. The SMCHD’s monitoring wells indicated insufficient groundwater levels to conduct reliable tests, prompting the suspension. The wet season, typically occurring in early spring, provides optimal conditions for these evaluations.
All perc test applications not yet scheduled or evaluated will be prioritized for the next wet season, expected in 2026, when groundwater levels are anticipated to recover. Applicants have the option to request a refund but will forfeit their scheduling priority if they reapply for the 2026 season. Refunds can be requested by contacting the SMCHD Environmental Health Division at (301) 475-4321.
For additional details, residents can visit the SMCHD’s perc testing page. The website provides comprehensive information on the testing process, requirements, and updates on scheduling.
The suspension reflects the SMCHD’s commitment to maintaining rigorous standards for environmental health and safety. Groundwater levels are a key factor in determining the suitability of land for septic systems, as inadequate absorption can lead to system failures and environmental contamination. By pausing testing until conditions improve, the department ensures reliable results for property owners and developers.
Applicants affected by the suspension are encouraged to contact the Environmental Health Division promptly to discuss their options. Those choosing to wait for the 2026 season will retain their place in the scheduling queue, ensuring faster processing when testing resumes. The SMCHD emphasized that reapplying after a refund would place applicants at the end of the priority list, potentially delaying their evaluations.
