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Job Details

Risk Assessment Scientist (Human Health/Ecological)


Health Scientist


Remote, Virginia, United States


If you are a junior to mid-level Human Health or Ecological Risk Assessment Scientist seeking a growth-oriented and diverse environment in which to work, or if you are an Environmental Scientist, Engineer or Statistician with experience in the consulting business wanting to embark on a new Risk Assessment career, then Leidos has a great opportunity waiting for you. Mentoring and training will be provided as you work with our highly experienced Risk Assessment team.

During your journey, you will also be afforded the opportunity to work on many different project-related tasks to round out your overall project knowledge and to develop your awareness of the importance of your risk assessment skills. In so doing, you will work collaboratively with Leidos’ multi-faceted staff of Project Managers, Geologists, Engineers, and Scientists of many disciplines from numerous Leidos offices and locations. The rewarding work that you’ll do for our clients will also make a positive difference for the environment. In addition, this position offers the flexibility of remote work, as well as the health benefits of work-life balance wellness. The continuous development of the Risk Assessment Scientist will be encouraged and supported through establishment of performance goals and opportunities for online, in-house and offsite training and/or professional certifications. Cross-training between the human health and ecological risk assessment disciplines is available.

The successful candidate should be comfortable working in a team environment, and demonstrate excellent written and strong verbal communication, as well as organizational skills. Frequent and timely communications with the Project Manager and project team members is expected.

The Risk Assessment Scientist will be dedicated to working full-time in support of the preparations of work plans, and investigative and decision documents that will involve report writing, data management and interpretation, and the performance of statistical- and risk-based calculations. We are seeking an individual who is an initiative-focused, goals-oriented self-starter, and is willing to be versatile in accepting a variety of work assignments, while being receptive to mentoring and oversight.

Primary Responsibilities:

  • Assist in conducting human health and ecological risk evaluations, including development of conceptual site models, selection of appropriate toxicity values, calculation of cancer risks and noncancer hazards, and analysis of uncertainties associated with the risk evaluations.
  • Provide technical support in evaluating and interpreting quantitative and qualitative environmental sampling data acquired during site investigations.
  • Support preparation of technical reports, including work plans/sampling plans, human health and/or ecological risk assessments, remedial investigation (RI) reports, feasibility studies (FS), proposed plans (PP), and records of decision (ROD).
  • Willing and able to support non-risk assessment tasks as needed.
  • Willing and able to travel periodically to Leidos office and/or project locations.

What Sets You Apart:

  • Bachelor's degree in Environmental Science, Earth Science, Biological Science, Chemistry, Toxicology, Ecology, or related scientific field, with 1 – 4 years' of professional experience performing human health or ecological risk assessments while working in a corporate or government environment.
  • Alternatively, applicants will also be considered who have worked 3 - 5 years’ specifically in the environmental science/engineering consulting business with risk assessment experience, but with any or all of the relevant experiences listed below, with an emphasis on the writing of CERCLA and or RCRA work plans, investigation reports and decision documentation.
  • Working knowledge or familiarity with EPA human health and/or ecological risk assessment guidance and methods within the framework of the CERCLA RI/FS/PP/ROD process.
  • Ability to compile, manage, and interpret environmental investigation and monitoring data for organic and inorganic chemical parameters.
  • Some experience working with federal environmental regulators.
  • Proficiency in MS Office tools (Excel, Word, Outlook, PowerPoint).

You Might Also Have:

  • Understanding of data validation qualifiers indicating usability.
  • Environmental statistical methods knowledge (e.g., calculation of UCLs, trend analysis) and software tools (e.g., EPA ProUCL, SAS, etc.). Applicants with a knowledge and working experience in statistical calculations/analysis will be given strong consideration.
  • Knowledge and experience with EPA online calculators for determining cancer risks, noncancer hazards, and screening levels/preliminary remediation goals.
  • Knowledge and experience with data and/or risk analyses of per- and polyfluoroalkyl substances (PFAS).
  • Experience working with radiological data
  • RCRA and CERCLA process documents knowledge (Corrective Action Plans/Reports; RI/FS/PP/ROD).
  • Experience working with state regulators is desired

Must possess a valid driver's license and pass government background checks to access U.S. Government facilities and systems. Due to contract requirements, only U.S. Citizens and U.S. Permanent Residents will be considered.

Original Posting Date:


While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $55,250.00 - $99,875.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.