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Salary
$44k – $58k per year
Location
In office (Seattle)
Seniority
Intern
Visa
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Employment
Internship

Confirmed on the employer's own hiring board on Oct 31, 2026. First seen by Alion on Oct 26, 2026.

Overview
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Profile match
Carollo Engineers is an environmental engineering firm headquartered in Walnut Creek, California, that works exclusively on water, planning and designing water, wastewater, stormwater and water reuse facilities. Founded in 1933, the employee-owned firm serves water agencies, municipalities, utilities and industrial clients from dozens of offices across the US and Canada, including Phoenix, Orlando, Dallas, Seattle, Tampa and Burnaby. It hires civil, environmental and water and wastewater engineers at entry, professional and senior levels, field engineers, stormwater specialists, project managers and engineering interns.

Overview

Carollo Engineers is a leading engineering firm dedicated exclusively to water. For over 90 years, we've specialized in the planning, design, and construction of water, wastewater, stormwater, and reuse facilities, bringing innovative and sustainable solutions to the water sector's most complex challenges.

We work with water agencies, municipalities, utilities, research organizations, and private companies across various industries, including technology, manufacturing, and beyond. These clients choose Carollo because we employ some of the most knowledgeable and experienced professionals in the world. When you join our team, you'll work alongside industry leaders who are advancing the science of water, protecting public health, and building resilient communities.

Carollo's vision is to be the best water consulting firm and the best place for you to build your career. If you're passionate about making a difference in this critical field, we invite you to explore a career with Carollo.

Responsibilities

We are seeking a water / wastewater engineering intern to support Carollo’s vision. As part of our team, you will work on projects related to municipal water and wastewater treatment plants, including but not limited to major treatment plant expansions, studies, and critical projects to help create sustainable and resilient environment for our community.

Responsibilities include:

  • Performing engineering work in water / wastewater treatment and conveyance infrastructure.
  • Work on engineering planning and design projects.
  • Prepare reports.
  • Develop plans and specifications.
  • Prepare cost estimates for various projects.
  • Hydraulic system modeling.
  • Development of alternative analysis of design options.
  • Preparation of technical memoranda, reports and electronic deliverables.

Qualifications

  • Highly motivated, articulate and self-starter.
  • Application of engineering principles including critical thinking, analysis and innovative techniques
  • Strong verbal and written communication skills.
  • Work well in a team environment.
  • Have the ability to communicate effectively with peers and mentors.
  • Enrolled or completed sophomore year of civil or environmental engineering degree program.
  • Coursework in the field of environmental engineering with an emphasis in hydraulics, physical, chemical, and biological treatment processes and treatment plant design.

Preferred Qualifications

  • Experience and/or coursework in water/wastewater treatment and conveyance
  • Previous related internship experience a plus, but not required
  • Knowledge and experience in water chemistry and regulations.

Compensation Range

$22.00 to $29.00 per hour. This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting. We may ultimately pay more or less than the posted range, and the range may be modified in the future. An employee’s pay within the salary range will be based on several factors including, but limited to, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs.

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