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Williams County, North Dakota

Licensed Septic Companies in Williams County, ND

47 septic companies serve Williams County, North Dakota, and 47 of them hold a North Dakota septic license or certification matched to the North Dakota Department of Environmental Quality / local health districts list (data as of October 2026).

Septic services in Williams County

Guides: Septic system installation · Septic inspection · Septic repair · Drain field repair · Installation cost · Pumping cost

47 septic companies in Williams County

Williston 39

  • 701 Scrap LLC

    Williston, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-9184

  • A&M Quality Building & Remodeling, LLC

    14763 Mortenson St, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (608) 481-2043

  • ACE Waterline Services, LLC

    Williston, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 580-8395

  • Advent Plumbing

    13782 Mariouns Ridge Rd, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 651-7050

  • Agri Industries, Inc. - Williston

    PO Box 1166, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    From their website: Installation · Inspection

    (701) 572-0767 agriindustries.com

  • All Source Plumbing

    PO Box 10495, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 609-1403

  • Alpha Septic and Sewer Inc

    3202 17th Ave W 501, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-8895

  • AOK Construction, LLC

    Williston, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (360) 219-6971

  • Black Diamond Solutions

    320 8th St W, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 609-8369

  • Black's Well Service

    13669 Redwood Way ND, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (850) 819-4561

  • Braaten Plumbing

    2203 2nd Ave W, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-1132

  • Clark and Sons Earthworks Consulting LLC

    4954 148th Ave NW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 580-0924

  • Cody Echevarria Construction LLC

    PO Box 6105, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (208) 571-4543

  • Coreys Septic Service

    14279 Painted Woods Dr, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-3320

  • Enywhey Services LLC

    PO Box 11104, Williston, ND 58803

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 774-8763 enywheyservicesllc.com

  • Goebel Construction

    4320 Main St, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 572-2086

  • High Plains Excavating LLC

    5471 138th Ave NW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 641-8455

  • High Plains Excavating LLC

    5471 138th Ave NW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 310-8225

  • JMAC Resources

    121 48th Ave SW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 774-8511

  • Joe's Digging Service, Inc.

    PO Box 452, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 572-9456

  • JTI Inc

    PO Box 1307, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-2915

  • KDW Construction

    PO Box 2219, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 609-8319

  • Kent's Plumbing and Heating LLC

    PO Box 834, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 609-6337

  • Lakeside Builders United, LLC

    5492 Sweet Clover Lane, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (906) 282-3005

  • Lakeside Builders United, LLC

    221 University Ave #102, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 774-6616

  • MC's Digging Service

    Williston, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 572-5079

  • Peter & Sons Excavation LLC

    2007 8th Ave E, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 609-9707

  • Prairie Winds Services, LLC

    4983 Hatzenbiler Ln, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    From their website: Installation · Repair · Drain field

    (701) 570-8433 pw-services.com

  • Scully Design Build, Inc

    PO Box 1883, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 570-4799

  • Spydr Oilfield Service, LLC

    5309 Saddle Ridge Cir Unit F, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 774-2340

  • SRD Excavation/Utilities Inc

    13990 W Front St, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 572-0080 srdllc.net

  • Stateline Services

    PO Box 1472, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 710-0474

  • Straight Shot Enterprise

    5749 143rd Ave NW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (602) 618-3149

  • TERAflex Group, LLC

    PO Box 10482, Williston, ND 58803

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (828) 558-1414 teraflexgroup.com

  • Triple I Contracting

    5482 Mathew Ave, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 651-8150

  • W-5 excavation Inc

    6702 Darby Ln., Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    From their website: Installation · Perc testing

    (701) 770-0635 w5excavation.com

  • WBP Contracting

    3720 Prarie Commons, Williston, ND 58802

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (406) 890-3507

  • Wiggy's Construction

    Williston, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-7532

  • Windsong Contracting, LLC

    5962 137th Ave NW, Williston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 425-8048 windsongcustomhomes.com

Grenora 2

  • Genin LLC

    7600 149th Ave. NW, Grenora, ND 58845

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 440-9077

  • Speedy Goat Counst

    Grenora, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (307) 922-3625

Tioga 2

  • Jim's Bobcat Service

    7563 102nd Ave NW, Tioga, ND 58852

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 641-3324

  • Neset Consulting Service, Inc

    6844 Hwy 40, Tioga, ND 58852

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 664-7330 nesetconsulting.com

Epping 1

  • Les Hanson Construction

    Epping, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 770-8501

Ray 1

  • Dickey Contracting

    Ray, ND

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (303) 818-0671

Siltli.ston 1

  • Folden Grading

    13348 Yellowstone MeadowW, Siltli.ston, ND 58801

    • Licensed: North Dakota Licensed Septic Installer (North Dakota Department of Environmental Quality / local health districts, verify)

    Per state license: Installation

    (701) 580-0341

Trenton 1

Septic licensing in North Dakota

North Dakota began licensing septic installers statewide under 2025 legislation (SB 2267); local public health units administer the program. The North Dakota DEQ and local public health units issues these credentials: Annual septic installer license.

Permits for new systems, replacements and most repairs are issued locally. Ask the contractor which office handles Williams County and whether the permit fee is in their quote.

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

Septic companies in Williams County: common questions

How many licensed septic companies are in Williams County, ND?

47 septic companies serve Williams County, North Dakota, and 47 of them hold a North Dakota septic license or certification matched to the North Dakota Department of Environmental Quality / local health districts 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 North Dakota?

North Dakota began licensing septic installers statewide under 2025 legislation (SB 2267); local public health units administer the program. The licensing body is the North Dakota DEQ and local public health units.

Which companies install septic systems in Williams County?

47 listings in Williams County install septic systems. New systems and replacements need a permit, so ask each installer to handle the permit and to show their North Dakota license.

How do I check a septic contractor's license in North Dakota?

Use the North Dakota DEQ and local public health units's lookup (https://deq.nd.gov/WQ/) and search the contractor's name or license number. Our guide to checking a septic license walks through it.