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Civil and Environmental Engineering
140 Point Judith Road
Unit #3A Mariner Square
Narragansett, Rhode Island 02882
Phone: 401.789.6865
Fax: 401.789.2053

Home Survey Site Design OWTS Structural
Class 3 Commercial & Residential Design
Class 4 Soil Testing
Application Package Preparation
Supervision of System Installation

Glenn Blacklock
Operations Manager


Deborah Bosworth
Soil Evaluator 
Lic. #D-4032





Onsite Wastewater Treatment SystemCarrigan Engineering Inc.’s Onsite Wastewater Treatment System Department includes knowledgeable staff with years of experience who know how to get the job done right.  We understand the application and tailor the product to meet your needs.  Contact us and request a proposal for your next project.

Carrigan Engineering Inc. stays up to date with the most current design standards by staying in constant contact with State of Rhode Island Department of Environmental Management and the University of Rhode Island Onsite Wastewater Training Center. You can visit the wesites below to obtain useful information on design standards.

When do I need a Onsite Wastewater Treatment System design?

  • If your property is not on a public sewer system, you will be in need of an Onsite Wastewater Treatment System (OWTS) design. Whether you are planning to build a new house on a vacant lot or build an addition to an existing house, the first step in the permitting process is an OWTS design and application to the Rhode Island Department of Environmental Management.

  • Carrigan Engineering Inc. employs a full time licensed Class 4 Soil Evaluator, whose job it is to determine water table depth, percolation rate, and the best location of the new OWTS. Working with our field survey data for existing conditions and land topography, we can design any type of system from the most conventional system to the most innovative treatment system.
  • Carrigan Engineering Inc. is also a State licensed Class 3 Desinger, we can then apply for all the regulatory agency processes including variances with Department of Environmental Management, Coastal Resource Management Council, and local Planning and Zoning Commissions.


© 2008 Carrigan Engineering Inc.