Principal Water Treatment Planning Engineer​/Manager

Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets. We are more than 34,000 people in over 30 countries, dedicated to improving quality of life. Everyone has an important role to play. Together we can solve the world’s most complex challenges and deliver more impact.

Arcadis is seeking a dynamic Principal Water Treatment Planning Engineer/Manager to join our Resilience Water Planning Practice in Southern California. This individual will lead water quality and treatment planning projects, guide long‑term strategy development, and support the delivery of complex, multidisciplinary planning projects. The role also includes mentoring a high‑performing team of planners, engineers, and scientists.

In this role, you will collaborate closely with regional leadership, national practice leaders, market sector leads, and client account managers to shape the future of water and recycled water planning across Southern California. You will support municipal and utility clients as they navigate evolving regulatory requirements, climate uncertainty, water supply resilience challenges, and infrastructure investment needs.

• Lead Water Quality and Treatment Planning:
  Direct comprehensive water and recycled water quality and treatment planning efforts, including treatment processes for regulatory compliance (groundwater and surface water treatment), operations evaluations (filter assessments or disinfection approaches), and distribution system water quality improvement (nitrification prevention and corrosion control). Develop strategies to address long‑term challenges related to water quality and treatment reliability, reuse, sustainability, resilience, and regulatory compliance.
• Lead Water and Recycled Water Treatment Improvements and Operations:
  Evaluate existing infrastructure and plan improvements to enhance operability, water quality, and infrastructure reliability. Support water and recycled water treatment utility start‑up, commissioning, and operations troubleshooting.
• Represent Clients/Utilities during Design and Construction:
  Act as the Owner’s Agent on alternative delivery projects, lead water quality evaluations, review designer treatment approaches, basis of design, and calculations, and develop performance guarantees and the associated start‑up and commissioning requirements.
• Strategic Advisory & Policy Support:
  Provide technical leadership on water policy, regulatory frameworks, and planning best practices. Advise clients on climate adaptation, drought resilience, water recycling, and sustainability initiatives.
• Support Business Development:
  Partner with Area Managers and Account Leaders across Southern California to develop and implement client engagement strategies. Build and maintain strong client relationships, identify and pursue strategic opportunities, and represent the firm at key industry events and conferences.
• Project Leadership & Delivery:
  Oversee multidisciplinary planning projects, ensuring deliverables are completed on scope, schedule, budget, and Arcadis quality standards. Provide technical guidance and quality assurance on planning analyses and documentation.
• Capital & Asset Planning:
  Lead development of capital improvement plans and asset investment strategies, incorporating risk‑based prioritization, lifecycle costing, funding strategies, and alignment with long‑term planning objectives.
• Professional Leadership:
  Actively participate in state and local professional associations to strengthen the Arcadis brand and expand networks. Contribute to industry committees and thought leadership initiatives.
• Develop and Inspire Talent:
  Mentor and develop water planning professionals, support recruitment efforts, and foster a collaborative, inclusive, and growth‑oriented team culture.

Travel (up to 20%) is anticipated across Southern California for client and project meetings, team engagement, planning initiatives, and industry events.

• Bachelor’s degree in Civil, Environmental, or Chemical Engineering or…