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 three 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 .



Our practice is focused on its knowledge of site investigations, environmental restorations and related sciences. Our scope of services includes planning, investigations, analytical testing, consulting, permitting, engineering, design and construction phases.

Soil & Groundwater

  • In-situ Chemical Oxidation.
  • In-Situ Soil & Groundwater Remediation and Monitoring.
  • Bioremediation
  • Free Product Recovery Systems

Underground Injection Control

  • Permitting and Compliance
  • Environmental Closure & Design
  • Sampling and Analysis

Waste Management
& Engineering

  • Solid Waste, Management & Waste Characterization
  • Health & Safety
  • Site Evaluation and Clean-up
  • Environmental Data Management
  • Hazardous and Non-Hazardous Waste Transportation and Disposal

Site Investigation

  • Phase I & Phase II Environmental Assessments.
  • Drilling
  • Environmental Audits
  • Site Characterization
  • Sampling & Laboratory Analysis

Management &
Pollution Control

  • Indoor Air Quality
  • Environmental Permitting
  • Landfill Closures and Post Closure Activities
  • Regulatory Compliance
  • Environmental Assessment
  • Community Relations

Tank Services

  • Removal, closure, installation, cleaning, and maintenance of Underground Storage Tanks (UST’s)Above Storage Tanks (AST’s)
  • Permitting and compliance

Risk Assessment &
RBCA Cleanups

  • Chemicals of Concern (COC’s)
  • Site Specific Target Levels (SSTLs) for remediation.
  • Environmental, Ecological, Human Health Risk Assessment
  • Analytical Fate and Transport Model
  • Risk-Based Corrective Actions for Petroleum releases and Leaking Underground Storage Tanks(LUST) sites. (ASTM 1739)
  • Site Conceptual Model (potential exposure pathways), for site receptors
  • Natural Attenuation
  • Indoor Air & Surface Quality Testing, including the SARS-CoV-2 (COVID-19) virus sampling and remediation.

Mold Assessment &

  • In-Situ Mold Remediation is revolutionizing the Mold Remediation Industry. The use of specialized products and applications to clean and disinfect to eliminate the Mold Growth Spores in the affected areas, ensure people to resume their routine in a safe ambience. All Mold Assessment & Remediation are under the Institute of Inspection Cleaning and Restoration Certification (IICRC), specifically IICRC S520 and the Standard Reference Guide for Professional Mold Remediation.
  • In-Situ Mold Remediation can be performed in houses, apartments, buildings, offices, theaters, hotels and casinos, schools, boats or any contaminated area.
  • Indoor Air & Surface Quality Testing, including the SARS-CoV-2 (COVID-19) virus sampling and remediation.

Free-Phase Product

  • Installation, Operation and Monitoring of free-phase product recovery systems from monitoring wells





On-Site Environmental, Inc. holds a strict trust confidentiality agreement between its clients. You will have full advantage of our working alliances (worldwide known and among the best in the industry) that enable us to develop and test a workable solution to permanently eliminate the contamination from your site in a timely and cost-effective manner without compromising safety.



OSE/CDM-Smith has worked an agreement with the United States Environmental Protection Agency (USEPA) for Design and Engineering Services (DES). OSE/CDM-Smith has performed various Remedial Investigation/Feasibility Studies at various Superfund Sites in Puerto Rico. OSE as Team Subcontractor, provides Geologists, Engineers, Scientists and Environmental Technicians experienced in environmental investigations, remediation and documentation. CDM-Smith under DES contract prepares remedial investigations and design for the USEPA, Region 2 at various
Superfund Sites in Puerto Rico.

Other works consists of locating and surveying installed monitoring wells, drilling, installation and purging of monitoring wells, collecting soil and groundwater samples and documentation, Site Specific Quality Assurance Project Plan, Site Specific Health and Safety Plan, GIS mapping and Oversight. Requirements such as quality assurance /quality control program are provided under on-site audits/inspections by EPA representatives. OSE furnishes highly experienced and qualified personnel, drilling equipment and supplies to support EPA Region II through the continuing Design and Services Contract Service Program in Puerto Rico and the U.S. Virgin Islands.


Vega Alta, Puerto Rico
North Coast Professional Village
Rd 693, Km. 12.9 Office #4
Sabana Ward, Sector Breñas
Vega Alta, PR 00692

For any inquiries, questions or commendations, please call: (787) 278-0563 or fill out the following form.

St. Thomas
Estate Nazareth, No. 1 Red Hook Quarter
Apt. #27 Charlotte Amalie
St. Thomas, VI 00802

(340) 642-6665
Head Office
North Coast Professional Village
Rd 693, Km. 12.9 Office #4
Sabana Ward, Sector Breñas
Vega Alta, PR 00692
Telephone: (787) 278-0563
Fax: (787) 278-0560
Email: onsitepr@onsitepr.com
Open Hours
Open Monday thru Friday from 8:00 a.m. to 5:00 p.m

Get a quote: (787) 278-0563
© 2022 by OnSite Environmental Inc. All Rights Reserved