Licensed Septic Companies in Coos County, NH
48 septic companies serve Coos County, New Hampshire, and 48 of them hold a New Hampshire septic license or certification matched to the New Hampshire Department of Environmental Services, Subsurface Systems Bureau list (data as of October 2026).
Septic services in Coos County
Guides: Septic system installation · Septic repair · Installation cost · Pumping cost
48 septic companies in Coos County
Colebrook 9
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Clark Jeffers
15 Grant Rd, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04356 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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E. J Wells
554 Reed Rd, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #02379 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
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Joos Excavating LLC
23, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05542 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Scott Nash
622 Nh Route 26, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03358 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Aaron Thayer
170 E Colebrook Rd, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05625 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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David Brunault
38 Hughes Road, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #02727 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
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Jon Cyr
97, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #03534 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
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Leo W Mackinnon
9 Mackinnon Rd, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #02898 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
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Robert W Brooks
66, Colebrook, NH 03576
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03910 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Lancaster 8
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Daniel M Kenison
7 Sunny View Dr, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04280 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Raymond Dubreuil
Po Box 2, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03528 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Swallow & Sons Excavation & Contracting
1166 Lancaster Road, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05689 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
From their website: Installation · Repair
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Alan Savage
15 Stebbins Hill Rd, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #02613 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Anthony Gray
97 Main St Apt 4, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04777 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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David W Chessman
236 Pleasant Valley Rd, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #03204 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
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Glen Lucas
140 Elm St, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05612 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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William M Turner
Po Box 483, Lancaster, NH 03584
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04632 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Whitefield 7
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Aaron Arsenault
183 Colby Rd, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05319 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Lee W Rashkin
26 Fawn Rd Dalton, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05846 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Mark T Vander-Heyden
Po Box 4, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #04084 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
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Daniel Gray
92, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05706 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Daniel R Garneau Sr
467 Route 115, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03778 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Philip Beaulieu
95 Hildreth Rd, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #05710 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
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Shawn White
19 Holly Heights St, Whitefield, NH 03598
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05685 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Milan 6
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Benjamin Lewis
231 Milan Road, Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05681 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Christopher M Guay
Po Box 142, Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05899 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Kurt S Masters
97 Success Rd, Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #04189 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
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Donald Doucette
Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05646 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Harley Mason Jr
653 W Milan Rd, Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03727 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Michael Doucette
Milan, NH 03588
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05647 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Berlin 3
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Michael J Rozek
2525 Howard Street, Berlin, NH 03570
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04847 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Roger Drouin
159 Jericho Road, Berlin, NH 03570
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03251 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Thomas Rozek
1 Lovett St, Berlin, NH 03570
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05668 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Errol 3
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Jonathan Lane
682, Errol, NH 03579
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05449 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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David L Blanchette
Po Box 308, Errol, NH 03579
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #04590 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Eric Ward
309 Upton Rd, Errol, NH 03579
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05561 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Pittsburg 3
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W.D. Dorman & Son Excavating & Paving
105 Camp Otter Rd, Pittsburg, NH 03592
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #04466 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #00073 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
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Warren E Chase
Po Box 339, Pittsburg, NH 03592
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #03239 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
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William C Rioux
37, Pittsburg, NH 03592
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05339 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Gorham 2
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Lee T Corrigan LLC - General Contractor
12 Wilfred St, Gorham, NH 03581
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05163 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
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Seth Quarrier
Po Box 298, Gorham, NH 03581
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05407 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Jefferson 2
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Lawrence J Kenison
75 Cedric Rd, Jefferson, NH 03583
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05293 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Michael Gray
254 Bailey Rd, Jefferson, NH 03583
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #03423 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
North Stratford 2
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Donald A Kohl
445 Us Rt 3, North Stratford, NH 03590
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05629 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
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Michael A Lynch
Po Box 33, North Stratford, NH 03590
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05285 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
No phone on the state list
Groveton 1
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Robert Eich
496, Groveton, NH 03582
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #05117 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
Twin Mountain 1
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Jason Sullivan
Po Box 129, Twin Mountain, NH 03595
- Licensed: New Hampshire NHDES Permitted Septic System Installer · #05436 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation
West Stewartstown 1
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James Belknap
Po Box 327, West Stewartstown, NH 03597
- Licensed: New Hampshire NHDES Permitted Septic System Designer and Installer · #04324 (New Hampshire Department of Environmental Services, Subsurface Systems Bureau, verify)
Per state license: Installation · Perc testing
No phone on the state list
No listings match those filters.
Septic licensing in New Hampshire
New Hampshire requires a NHDES permit to design or install a septic system; the Subsurface Systems Bureau publishes the list of permitted designers and installers. The NH Department of Environmental Services, Subsurface Systems Bureau issues these credentials: Permitted installer (RSA 485-A:36); Permitted designer.
Permits for new systems, replacements and most repairs are issued locally. Ask the contractor which office handles Coos County and whether the permit fee is in their quote.
New Hampshire septic licensing: agencies, license types and how to check a license →
Septic companies in Coos County: common questions
How many licensed septic companies are in Coos County, NH?
48 septic companies serve Coos County, New Hampshire, and 48 of them hold a New Hampshire septic license or certification matched to the New Hampshire Department of Environmental Services, Subsurface Systems Bureau 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 New Hampshire?
New Hampshire requires a NHDES permit to design or install a septic system; the Subsurface Systems Bureau publishes the list of permitted designers and installers. The licensing body is the NH Department of Environmental Services, Subsurface Systems Bureau.
Which companies install septic systems in Coos County?
48 listings in Coos County install septic systems. New systems and replacements need a permit, so ask each installer to handle the permit and to show their New Hampshire license.
How do I check a septic contractor's license in New Hampshire?
Use the NH Department of Environmental Services, Subsurface Systems Bureau's lookup (https://www.des.nh.gov/land/septic-systems/septic-designer-or-installer) and search the contractor's name or license number. Our guide to checking a septic license walks through it.