Senior Hydrogeologist

life insurance, paid time off, paid holidays, 401(k)

We are seeking an experienced part-time Senior Hydrogeologist to lead and provide QA/QC for groundwater-related projects in support of environmental, water resource, and infrastructure initiatives. This role is responsible for technical oversight, client coordination, regulatory coordination, and mentoring junior staff. The ideal candidate brings strong analytical expertise, sound judgement, and the ability to deliver high-quality work on complex hydrogeologic investigations. Candidate must have experience and expertise in high‑resolution site characterization and integration of groundwater dynamics into site investigation, conceptual site model development, and remedial planning, with particular emphasis on per‑ and polyfluoroalkyl substances (PFAS).

• Lead groundwater investigations, aquifer testing, and hydrogeologic assessments.
• Oversee groundwater modeling, data analysis, and technical report preparation.
• Coordinate with regulatory agencies and ensure compliance with local, state, and federal requirements.
• Provide technical guidance and mentorship to junior staff.
• Support business development efforts, including proposals and client presentations.

• Bachelor's or Master's degree in Hydrogeology, Geology, or related field.
• 8+ years of progressive hydrogeology experience.
• Professional Geologist (PG) license required.
• Strong experience with groundwater modeling software and data interpretation.
• Excellent written and verbal communication skills.
• Proven ability to manage multiple projects and client relationships.

This position offers the opportunity to work on impactful environmental and water resource projects while contributing to the growth and technical excellence of the team.

Halff is a full‑service infrastructure consulting firm planned, designed, engineered, constructed - and purposed - for people. Since 1950, we've been creating smart solutions that improve lives and communities by turning ideas into reality.

Halff was founded on a core tenet:
Focus on people, treat them well, and success will follow. It's no wonder, then, that our employees and the culture they create result in our firm consistently being named a Top Workplace in America.

Our industry‑leading professionals collaborate to meet tough challenges in creative ways. You can view Halff's full complement of services here.

Halff has more than 30 offices in Texas, Oklahoma, Louisiana, Florida, Arkansas, Arizona and Georgia. For a full list of our locations, .

We offer excellent benefits, including but not limited to:

• Medical, dental, prescription and life insurance
• Long‑term and short‑term disability insurance
• Paid time off (PTO) and 8 company paid holidays (and Veteran's Day for our veterans)
• Traditional and Roth 401(k) plans
• Employee Stock Ownership Plan (ESOP)
• Health Savings Account (HSA)
• 529 College Savings Plan
• Flexible spending accounts (FSA)
• Employee Assistance Plan
• for a more comprehensive list of Halff's benefits

Salary is competitive and commensurate with experience. All qualified applicants will receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, disability, veteran status, or other legally protected status. Halff is a drug‑free workplace. This offer of employment is contingent upon the receipt of a clear drug screen and background check prior to your first day of employment.

This position may be subject to random drug testing pursuant to federal regulations.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities. This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor.