Environmental Toxicologist – Senior Level (Hybrid

Senior Environmental Toxicologist

Barr is seeking a senior environmental toxicologist to support complex, multidisciplinary projects focused on contaminated sediment, surface water, groundwater, and ecological risk assessment. Assignments may include conducting ecological risk assessments; developing toxicity and exposure evaluations for contaminated sediment projects; interpreting environmental chemistry and toxicology data; preparing technical reports, study design and sampling plans, and quality assurance documentation; and contributing to projects conducted under CERCLA, RCRA, NEPA, NRDA, and other federal and state environmental programs.

The ideal candidate brings strong analytical judgment, excellent technical writing skills, advanced knowledge of environmental toxicology, and experience working within the regulatory frameworks that guide contaminated site cleanup. They demonstrate leadership, the ability to coordinate multiple priorities, and the interpersonal skills needed to work effectively with colleagues, clients, agencies, and stakeholder groups. Above all, they value teamwork, quality, and integrity in delivering impactful environmental solutions.

Your impact – key responsibilities

• Technical knowledge: apply advanced environmental toxicology principles to evaluate chemical exposure and effects across sediment, water, and biological systems. Interpret chemistry and toxicity data to support ecological risk assessments and help inform remedial decision-making.
• Project leadership: lead or support project and task delivery, including developing scopes, schedules, and budgets, managing teams, and producing high-quality technical documents. Foster strong client relationships and contribute to successful execution of complex environmental projects.
• Problem solving and regulatory strategy: assess site-specific environmental conditions and develop scientifically defensible approaches aligned with CERCLA, RCRA, and other regulatory programs. Provide clear technical and regulatory recommendations that support environmental decisions and cleanup strategies.
• Communication: prepare clear, compliant technical documentation and effectively communicate complex concepts to both technical and non-technical audiences.
• Interpersonal savvy: collaborate with multidisciplinary teams and clients to align technical work with project objectives while fostering strong, productive working relationships. Mentor junior staff, support team development, and contribute positively to Barr's culture of teamwork, respect, and client service.

About the opportunity

• Hybrid: a hybrid work arrangement may be considered for this position. A hybrid work arrangement refers to splitting time worked between a Barr office and a home office. This position can be based out of Barr's Seattle, Washington or Denver, Colorado office.
• Travel expectation: willingness to travel and periodically adjust personal schedule to meet project needs; fieldwork opportunities may be available in this role, depending on project needs, interests, and experience, and may include some out-of-town travel.
• Work environment: ability to work in locations that may feature rough terrain typical of construction sites and may also require entering and working in facilities that include limited accessibility, moving machinery, and other conditions typical of industrial facilities. Job assignments may involve work on waste disposal sites and sites requiring cleanup of hazardous materials. An OSHA-mandated physical exam may be required.
  
  Safety training will be provided. Applicants may be asked to participate in a drug screening program at the request of specific clients. Candidates must be able to perform job duties with or without reasonable accommodation.

Physical requirements for the role may include the following for site visits and/or fieldwork:

• Ability to conduct fieldwork in varying outdoor conditions (e.g., heat, cold, rain, uneven terrain).
• Must be able to lift and carry equipment and materials weighing up to 50 pounds.
• Capable of standing, walking, kneeling, or crouching for extended periods.
• Use of personal protective equipment (PPE) as required by site…