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Howard County, Maryland

Licensed Septic Companies in Howard County, MD

24 septic companies serve Howard County, Maryland, and 24 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 Howard County

Guides: Septic system installation · Septic repair · Aerobic septic systems · Installation cost · Pumping cost

24 septic companies in Howard County

Woodbine 9

  • Cumberland Co, Inc

    16391 A. E. Mullinix Rd, Woodbine, MD 21797

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (301) 854-6838 cumberlandcompanyinc.com

  • Cumberland Development Custom Homes

    2983 Duvall Road, Woodbine, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (301) 252-1122

  • Kings Construction Materials

    6842 Old Washington Rd, Woodbine, MD 21797

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    From their website: Installation · Repair Per state license: Aerobic systems

    (240) 440-7598 kingsconstructionmaterials.com

  • Level Land Inc

    15298 Union Chapel Rd, Woodbine, MD 21797

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 489-5206 levellandinc.com

  • Marc D Hereth Construction LLC

    2551 Florence Road, Woodbine, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (301) 580-5977

  • Mid Atlantic Contracting Inc

    7749 Woodbine Rd, Woodbine, MD 21797

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 795-4800 midatlanticcontracting.com

  • Paul H Dymond Corp

    14631 Red Line Drive, Woodbine, MD 21797

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (443) 250-9407

  • Paul H. Dymond Corp

    14631 Red Line Drive, Woodbine, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 320-1681

  • Wtc III P&H

    1820 Gillis Falls Road, Woodbine, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (443) 398-1782

Lisbon 3

  • Level Land Inc

    Po Box 100, Lisbon, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 439-5206

  • Level Land Inc

    P.O. Box 100, Lisbon, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 465-5206

  • Level Land Inc

    Po Box 100, Lisbon, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    No phone on the state list

Columbia 2

  • Howard County

    7178 Gateway Dr, Columbia, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 313-2691

  • Howerd CHD

    8930 Stanford Blvd., Columbia, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 313-1789

Ellicott City 2

  • J McDonald Contracting LLC

    10045 Baltimore National Pike A7 #1221, Ellicott City, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 360-1800

  • M & R Construction Group LLC

    4783 Leyden Way, Ellicott City, MD 21042

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 660-9960 mrconstructiongrp.com

Marriottsville 2

  • Farm And Home Excavating Inc

    901 Driver Rd, Marriottsville, MD 21042

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 442-2139 farmandhomeservice.com

  • The Carpenter Shop

    1726 Arrington Rd, Marriottsville, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 781-4746

West Friendship 2

  • Brandom Smitth Contractors, Inc

    1975 Mckendree Rd, West Friendship, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 984-8512

  • MRG Plumbing

    3222 Rosemary Lane, West Friendship, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (443) 473-0692

Elkridge 1

  • Mayer Bros Inc

    6264 Race Rd, Elkridge, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (410) 796-1434

Highland 1

  • Garlan L Brian Sr LLC

    12871 Highland Rd, Highland, MD

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (301) 854-2161

Knoxville 1

  • Boyer Construction Inc

    4028 Petersville Rd, Knoxville, MD 21738

    • Licensed: Maryland MDE Certified BAT (Best Available Technology) Septic Installer (Maryland Department of the Environment, verify)

    Per state license: Installation · Aerobic systems

    (301) 748-5559 whboyer.com

Sykesville 1

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 Howard County and whether the permit fee is in their quote.

Maryland septic licensing: agencies, license types and how to check a license →

Septic companies in Howard County: common questions

How many licensed septic companies are in Howard County, MD?

24 septic companies serve Howard County, Maryland, and 24 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 Howard County?

24 listings in Howard County 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.