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Find septic professionals and service providers

Use these lists to find a septic professional or contractor to help with your project.

Qualified individuals and providers: If you would like to have your company name and details added to the list, please contact Environmental Health Services.

Qualified septic professionals, contractors, and service providers

Note that qualified professionals and licensed septic contractors are qualified to conduct the inspection and monitoring work of a service provider for the submittal of monitoring reports for alternative septic systems.

These lists are provided as a public service and do not indicate endorsement by the County of Marin, Environmental Health Services.

Engineering firms, licensed engineers, R.E.H.S, and registered geologists who can help by determining site feasibility and design septic systems.

Licensed engineers / R.E.H.S. / Registered geologists
Company Location Contact Phone number
Adobe Associates, Inc. Santa Rosa, CA Steven Brown, PE RCE 43825 707-541-2300
Agnew Civil Engineering  San Rafael, CA Orion Agnew, RCE 87262 415-322-3196
AYS Engineering Group Inc Petaluma, CA Troy Pearce, RCE 55988 707-763-6620
BG Engineering Group Santa Rosa, CA BG Engineering Group 707-542-4321
Campi Engineering Fairfield, CA Jim Campi, PE #65518 707-372-3598
Clark Civil Engineering Point Reyes Station, CA Will Clark, RCE 65497 415-295-4450 
CSW/Stuber-Stroeh Engineering Novato, CA Rich Souza, PE, QSD/QSP RCE 67892 415-883-9850
Dimensions 4 Engineering, Inc. Santa Rosa, CA Ben Walker, REHS #9387 707-578-3433 x 112
Eckman Environmental Designs, Inc. Mill Valley, CA Noadiah Eckman, R. Geologist 7486 540-390-3992
Huffman Engineering & Surveying Santa Rosa, CA Rob Huffman, PE, LS RCE 44293 707-542-6559 
Lescure Engineers, Inc. Santa Rosa, CA Peter J. Lescure RCE 28044 707-575-3427
NexGen Engineering & Consulting LLC Rocklin, CA 95765 Ian Cole, RCE #66602 916-345-3454
Questa Engineering Corporation Point Richmond, CA Norm Hantzsche, PE RCE 24750 510-236-6114

Contractors who build and repair septic systems.

Septic contractors
Company Location Contact Additional contact License number Phone number
B&B Hardscape, Inc. Lagunitas, CA 94938 Robert Penner Aaron Howe Lic. 902943, A-Gen. Eng 415-302-0720
Bob's Underground Septic Maintenance Santa Rosa, CA 95406 Roberto Manetti N/A Lic. 1158760 Class C-42 707-843-6944
C & C Contracting Cotati, CA 94931 Chris Chavez N/A Lic. 823983 C42 707-236-2594
City Sewer Plumbing, Inc. Point Reyes Station, CA 94956 Michael Giammona N/A Lic. 739966 C-42 415-663-1926
Drew Underground Construction Santa Rosa, CA 95407 Dewayne Drew N/A Lic. 484067 A-Gen. Eng, C42 707-545-0432
Innovative Systems Inc. Guerneville, CA 95446 Nick Johnson N/A Lic. 462989 C42 707-484-6718
JFM Septic System Installation Forestville, CA Jesus Flores Medrano N/A Lic. 1068533 A Gen Eng., C-42 707-293-7568
John Hope Construction Inverness, CA  94937 John Hope N/A Lic. 712310 A-Gen. Eng 415-606-4673
Kevin Furlong Construction P. O. Box 388, Valley Ford, CA 94972 Kevin Furlong Construction N/A Lic. 668115  A-Gen.Eng 707-876-3588, 707-481-8161
Lunny Grading & Paving Inverness, CA 94937 Kevin Lunny N/A Lic. 600250 A-Gen. Eng 415-669-7261
Nor Cal Superior Systems Petaluma, CA 94952  Angel Rangel N/A Lic. 1099654 C-36 Plumbing 415-895-8584 , 707-536-3338 
Northwest Systems Inc. Anderson, CA Francisco Villanueva  Miguel Rangel Gonzalez Lic. 1060678 A-Gen. Eng 707-710-0303
Sebastopol Construction Services Inc. Sebastopol, CA 95472 Leeroy Ress N/A Lic. 776158 A-Gen. Eng 707-823-0247

Service providers who help with inspection, monitoring, and maintenance of septic systems.

Septic service providers
Company Location Contact Additional contact License number Phone number
Accredited Septic Rohnert Park, CA 94927 Matt Myers N/A NAWTS: 1454ITC 707-644-8875
Accuracy Monitoring/Testing Petaluma, CA 94955 Troy Pearce N/A RCE No. 55988 707-763-6620
Bay Area Septic Tech LLC San Francisco, CA 94133 Dylan Dominguez-DeGennaro N/A NAWTS CERT: 17010OMI 925-878-1101
B & B Hardscape, Inc. PO Box 400, Lagunitas, CA 94938 Bob Penner Aaron Howe Class-A Contractor  Lic. 902943 415-852-8115
Bob's Underground Septic Maintenance Santa Rosa, CA 95406 Roberto Manetti N/A Lic. 1158760 Class C-42 707-843-6944
City Sewer Pumping, Inc. PO Box 651, Point Reyes Station Michael Giammona N/A C-42 Contractor, Lic. 739966 415-663-1926
Justin Thomasson Sebastopol, CA 95472 Justin Thomasson N/A Class-A Contractor, Lic. 892457 707-696-8706
McCollum Wastewater Mgmt. Yountville, CA 94599 Gary McCollum N/A Class-A Contractor, 547731 707-252-6220 
North Marin Septic Service PO Box 143, Cotati, CA Russ Lincoln N/A N/A 707-696-1598
North West Systems Inc. Anderson, CA Francisco Villanueva  Miguel Rangel Gonzalez Class-A Contractor, Lic. 1060678 707-710-0303
Questa Engineering Corp. PO Box 70356, Point Richmond, CA 94807 Questa Engineering Corp. N/A RCE No. 24750 510-236-6114
Sebastopol Construction Services Sebastopol, CA 95472 Leeroy Ress N/A Class-A Contractor, Lic. 776158 707-975-4366
Sonoma Marin Septic Penngrove, CA 94951  Joe Giammona N/A C-42 Contractor, Lic. 999758 707-486-7382

Monitoring results shall be reported on a standard form approved by the Health Officer. The monitoring report shall be signed by the Registered Engineer, Registered Environmental Health Specialist (R.E.H.S.), Registered Geologist, Certified Professional Soil Scientist, Certified Engineering Geologist, or other qualified service provider responsible for the monitoring.

Notwithstanding the annual report, the County shall be notified immediately of any significant system problems observed during the inspection and monitoring, at any other time.

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Page last updated on October 2, 2026.