ON-SITE ENVIRONMENTAL, INC., (OSE) is a Puerto Rico and US Virgin Islands based environmental services company committed to the environmental restoration of soils, groundwater and building contamination. For more than two and half decades, our main objective has been to eliminate contamination by using innovative environmental technology applications, which are environmentally safe and cost effective.

Since our beginning in November 1993, we have successfully completed numerous site investigations of soil, groundwater and building remediation projects including In-Situ Chemical Oxidation and Bioremediation, Free Product Recovery System, Waste Management and Engineering, Site Investigation and Characterization including Technical and Laboratory Services, Risk Assessments and Cleanups. In addition, we are a Service-Disabled Veteran-Owned Business and a Small and Disadvantage Business (SDB) certified by the U.S. Small Business Administration.

We appreciate your interest in us and look forward to the opportunity to serve you as a valued client of ON-SITE ENVIRONMENTAL, INC.


“Our People: On-Site Environmental, Inc. is composed of a full staff of experienced project managers, chemist, superintendents, equipment operators, and hazardous material technicians. Our team of experts are properly trained and certified according to Occupational Safety and Health Administration (OSHA) requirements to assure compliance with federal and local regulations. We are committed to promote in all employees a strong sense of client services”.

Ricardo N. Alvarez, PE

Principal & General Manager of Operations

Hermes Chacon, P.G.

Senior Project Manager


On-Site Environmental, Inc. (OSE) was founded in November 1993 in San Juan, Puerto Rico. The company is owned and operated by Ricardo N. Alvarez, P.E., R.E.M. OSE is the first company known for bioremediation services in Puerto Rico.

Since the beginning, OSE has successfully completed over 350 site investigations, including soil and groundwater remediation projects in full compliance with Puerto Rico Environmental Quality Board and US Environmental Protection Agency.


On-Site Environmental, Inc., combines strong regulatory knowledge and technical expertise to develop innovative cost-effective solutions. We are committed in making our philosophy and mission work for every client and every project. We ensure our mission will help our clients keep their own commitments to their communities, customers, and employees. As a result of the implementation of this philosophy and mission, 75 percent of our new business comes from referrals.

Our team continuously strives to achieve long-term successful relationships with clients by focusing on client needs and performance results. We achieve client satisfaction while providing outstanding technical services. We encourage our competitive staff with continuous training to expand their technical capabilities and professional experience for optimum performance. We enable our staff to perform projects within a strong management and peer review structure with an explicit emphasis on timeliness, budget control and value to client. Our commitment is to provide first-rate quality environmental services, which are completed in a timely and cost-effective manner without compromising safety.

“Safety record is a matter of pride for us”


On-Site Environmental, Inc., (OSE) throughout his President and professional personnel proudly sponsored international environmental associations such as Association for Environmental Health and Sciences (AEHS) Foundation, which is an international organization with over 700 members and 25,000+ affiliates worldwide representing a wide variety of professional disciplines and organizations.

As a member of the prestigious AEHS Foundation’s Scientific Advisory Board (SAB) creates the opportunity to transfer knowledge and enhance cooperation in addressing environmental issues in the Caribbean, creating solutions for the environmental problems.

OSE has been a member of AEHS since 1995 and has addressed the following presentations during its Annual International Conference in 2011: Perozone® Groundwater Sparging of a Fuel Spill in Aymamon Limestone Deposits in Puerto Rico and In-Situ Ozone Remediation Update with William B. Kerfoot as Session Chair, addressing “In-Site Remediation of High Weight Petroleum Hydrocarbons (C9-C39) at a U.S. Virgin Islands Site”. In addition, OSE keeps its bond as a member with Puerto Rico Engineers and Land Surveyors (C.I.A.P.R.) addressing environmental conferences in its Annual Assemblies respectively.
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