Licensed Septic Companies in Leonardtown, MD
9 septic companies serve Leonardtown, Maryland, and 9 of them hold a Maryland septic license or certification matched to the Maryland Department of the Environment list (data as of October 2026).
Septic services in Leonardtown
Guides: Septic system installation · Aerobic septic systems · Installation cost · Pumping cost
9 septic companies in Leonardtown
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Downs Plumbing & Septic
Po Box 2324, Leonardtown, MD 20650 · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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Eagle Excavating & Concrete LLC
45191 Medley'S Neck Rd, Leonardtown, MD 20650 · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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Heartwood Homes Ltd
41540 Singletree Drive, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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J & W Excavating
23857 Hollywood, Po Box 381, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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J Browne Excavating, LLC
21798 Point Lookout Rd, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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James Goddard Excavating
23708 Point Lookout Excavating, Leonardtown, MD 20650 · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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Ronald Delahay
39980 Stillwater Lane, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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Southern Md Environmental
21798 Point Lookout Rd, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
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Southern Md Homes
22794 Brown Rd, Leonardtown, MD · St. Mary's County
- Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)
Per state license: Installation · Aerobic systems
No listings match those filters.
Septic licensing in Maryland
Maryland certifies installers of nitrogen-reducing BAT septic units; installers also need the unit maker's certification, and some counties require a local license. The Maryland Department of the Environment issues these credentials: BAT (Best Available Technology) certified installer; County septic installer licenses in some counties.
Permits for new systems, replacements and most repairs are issued locally. Ask the contractor which office handles Leonardtown and whether the permit fee is in their quote.
Maryland septic licensing: agencies, license types and how to check a license →
Septic companies in Leonardtown: common questions
How many licensed septic companies are in Leonardtown, MD?
9 septic companies serve Leonardtown, Maryland, and 9 of them hold a Maryland septic license or certification matched to the Maryland Department of the Environment list (data as of October 2026). Each license badge on this page names the agency and links to its lookup so you can confirm it.
Who licenses septic contractors in Maryland?
Maryland certifies installers of nitrogen-reducing BAT septic units; installers also need the unit maker's certification, and some counties require a local license. The licensing body is the Maryland Department of the Environment.
Which companies install septic systems in Leonardtown?
9 listings in Leonardtown install septic systems. New systems and replacements need a permit, so ask each installer to handle the permit and to show their Maryland license.
How do I check a septic contractor's license in Maryland?
Use the Maryland Department of the Environment's lookup (https://mde.maryland.gov/programs/water/BayRestorationFund/OnsiteDisposalSystems/Pages/index.aspx) and search the contractor's name or license number. Our guide to checking a septic license walks through it.