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Administrative Assistant Intern

MWH Constructors
United States, California, Corona
5215 Green River Rd (Show on map)
Dec 18, 2025

MWH is a leading water and wastewater treatment-focused general contractor in the US with a rich history dating back to the 19th century. Fueled by the mission of Building a Better World, our teams are rapidly growing across the nation.

As a company committed to our team's well-being and growth, we offer a supportive work environment, opportunities for advancement, and the chance to contribute to a mission that shapes the future. Your expertise and ambition are valued here.

The work we do matters. The critical systems infrastructure we build changes lives, betters' communities, and improves ecosystems. If you're passionate about this, we want to hear from you!

About the Role

MWH is currently seeking a qualified Administrative Assistant Intern to support project work. This position will be based in Corona, CA

Essential Functions



  • Help schedule meetings and keep calendars up to date
  • Assist with travel arrangements and meeting notes
  • Greet visitors and help with office reception duties
  • Organize and file project documents (paper and digital)
  • Track office supplies and help with ordering
  • Support with data entry and spreadsheets
  • Help prepare shipments and mailings
  • Assist with event planning and team activities
  • Learn about document control and project support tasks
  • Contribute on general admin tasks as needed


Required Qualifications



  • Experience providing administrative support.
  • High School diploma or equivalent.
  • Proficiency in Microsoft office (Word, Excel, PowerPoint), and Outlook (Calendar and Address functions). Ability to learn other software programs as needed.
  • Willingness to step in and lend a hand on any administrative requests for the project.
  • Able to maintain high standards despite pressing deadlines; establish high standards and measures; do work right the first time and inspect material for flaws; reinforce excellence as a fundamental priority.
  • Able to handle confidential and time-sensitive information with discretion and independent judgment.
  • Self-motivated and proactive; demonstrated interest in taking initiative, anticipating needs, carrying projects through to completion with minimal direction, and working with a high degree of urgency.
  • Able to produce high quality work consistently on multiple assignments, in a deadline-driven environment; superior organization and project management skills. Ability to anticipate and seek out needs, and ask for further clarification when necessary.
  • Positive attitude and flexibility in environment of tight deadlines, frequent interruptions, unresolved problems, changes, and unexpected events.
  • Superior interpersonal skills, telephone manner, and knowledge of business protocol; strong belief in customer service.
  • Able to develop and maintain cooperative, enthusiastic, flexible, and effective working relationships with clients and team members.



Preferred Qualifications



  • Previous experience working in the construction industry or in project administration



MWH Constructors is a global project delivery company in heavy civil construction with a focus on water and wastewater treatment infrastructure. With the ultimate goal of delivering maximum value to clients and their local communities, MWH Constructors provides single-source, integrated design and construction services through a full range of project delivery methods. Incorporating industry-leading preconstruction and construction services, the Company's multi-disciplined team of engineering and construction professionals delivers a wide range of projects, including new facilities, infrastructure improvement and expansion, and capital construction services.

Equal Opportunity Employer, including disabled and veterans.

Pay range: $25hr

Please note that all positions require pre-employment screening, including drug and background check, as a condition of employment.

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