Our San Diego Phase 1 Environmental Site Assessments Report is completed by experienced staff, and all are directed by environmental professionals with a minimum of 10 years’ experience. Our San Diego projects are very cost-effective because we are a small company and do not have the large overhead and expenses of a large company. We have the available staff and experience to complete multi-site portfolios with very short due dates in San Diego. We take pride in the fact that we can provide quality Phase I ESA reports for less than our competition in San Diego.

RSB Environmental is the national leader in the Phase 1 Environmental Site Assessment Report by volume. Most reports are performed to meet the standards of ASTM E1527-21. RSB Environmental often customizes reports to meet individual client or agency lender’s (Fannie Mae, Freddie Mac) requirements while taking the widely varying geology and topography of the San Diego region into consideration.

Phase 1 Environmental Site Assessment Report Scope:

Site Visit

Historical Research

Geology and Hydrogeology

Regulatory Research

Interviews and Document Review

Our Service Areas

RSB has conducted Phase 1 Environmental Site Assessment Report projects nationwide. Locally RSB has completed numerous projects in San Diego. Please feel free to call us at 1-833-910-2535 or email at info@rsbenv.com to get a site specific price for your property.


Frequently Asked Questions

A Phase 1 Environmental Site Assessment (ESA) is a report that summarizes the results of an environmental investigation of a property. It includes a site visit, a review of historical and current uses, an evaluation of potential environmental hazards, a review of previous environmental investigations or cleanups, an evaluation of wetlands or protected natural resources, an evaluation of historical or cultural resources, a review of regulatory information, an assessment of sources of groundwater or surface water contamination, an assessment of air or noise pollution sources, and an assessment of soil contamination issues. The report also includes recommendations for further investigation or testing and potential liabilities or risks associated with the property.


When a property is being examined for acquisition, financing, or insurance, a Phase 1 Environmental Site Assessment (ESA) report is often required. It is also often used as a due diligence technique for environmental compliance, particularly in commercial real estate transactions. The study identifies possible environmental dangers or liabilities connected with a property and makes suggestions for further research or mitigation. It is also frequently needed as a condition of a transaction by lenders, insurance firms, and government bodies.

  • A Phase 1 ESA may also be necessary in the following circumstances:
  • When a building is leased or rented
  • When a property is being built or reconstructed
  • When a property is converted to a new use
  • When a house is sold or moved,
  • When a property gets refinanced
  • When a home is used as collateral for a loan
  • It’s also worth noting that some states and municipalities may have particular legislation requiring Phase 1 ESAs for certain sorts of properties or operations, such as those with a history of industrial use or those near ecologically sensitive regions.


A Phase 1 Environmental Site Assessment (ESA) study identifies any possible environmental threats or liabilities connected with a site and provides suggestions for further research or mitigation. Typically, the investigation involves a study of the property’s historical and present usage, an appraisal of possible environmental dangers, and a review of any prior environmental investigations or cleanups undertaken on the site. The report is typically used for due diligence reasons in real estate purchases, loans, and insurance.

Lending institutions, insurance companies, and other parties generally demand a Phase 1 ESA report as a condition of a transaction. Compliance with environmental rules, particularly in the context of commercial real estate transactions, is another function. The report is designed to evaluate potential environmental hazards, also known as environmental liabilities or risks, related to a property, such as soil or groundwater contamination, hazardous waste, or other environmental problems. In addition, it includes suggestions for future action, such as more testing or remediation.

In conclusion, the primary purpose of a Phase 1 ESA report is to identify potential environmental threats and liabilities associated with a property and provide recommendations for further investigation or mitigation in order to protect public health and safety, the environment, and to facilitate property transactions, lending, and insurance.



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