Water/Wastewater Engineering Intern
Seattle, WATemporary$22–29/hrSeen 1w agoSeen in employer's feed today
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At a glance
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Job overview
Carollo Engineers is seeking a water/wastewater engineering intern to support projects involving municipal treatment plants, expansions, studies, and related infrastructure. The intern will contribute to planning and design work, including hydraulic modeling, alternatives analysis, technical deliverables, and cost estimates. The role is based in Seattle and is temporary, with an hourly compensation range of $22.00 to $29.00.
Skills & qualifications
Skills
Qualifications
Full job description
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:
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Performing engineering work in water / wastewater treatment and conveyance infrastructure.
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Work on engineering planning and design projects.
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Prepare reports.
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Develop plans and specifications.
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Prepare cost estimates for various projects.
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Hydraulic system modeling.
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Development of alternative analysis of design options.
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Preparation of technical memoranda, reports and electronic deliverables.
Qualifications
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Highly motivated, articulate and self-starter.
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Application of engineering principles including critical thinking, analysis and innovative techniques
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Strong verbal and written communication skills.
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Work well in a team environment.
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Have the ability to communicate effectively with peers and mentors.
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Enrolled or completed sophomore year of civil or environmental engineering degree program.
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Coursework in the field of environmental engineering with an emphasis in hydraulics, physical, chemical, and biological treatment processes and treatment plant design.
Preferred Qualifications
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Experience and/or coursework in water/wastewater treatment and conveyance
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Previous related internship experience a plus, but not required
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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.
EOE including disability/veteran (https://careers-carollo.icims.com/jobs/4682/water-wastewater-engineering-intern/job?mode=apply&apply=yes&in\_iframe=1&hashed=-1834471131)
Software Powered by ICIMS
Job Locations US-WA-Seattle
ID 2026-4682
Category Engineering
Type Temporary
How this job compares
Set against the 1,384 open Civil Engineering jobs on Olive Jobs, counted November 4, 2026.
- Pay
- This posting$22–29/hr
- US median$22–30/hr285 hourly ranges
This range's midpoint, $25.50/hr, is 4% below the US median midpoint ($27/hr) — in the middle half of Civil Engineering hourly ranges across the US.
- Openings
- Olive Jobs lists 28 open Civil Engineering jobs in Washington and 1,384 across the US. 4% of them nationwide are listed as remote or flexible.
- Hiring the most in Washington
- Carollo Engineers (this employer)3 open
- Jacobs3 open
- RH2 Engineering3 open
- Experience
- Civil Engineering postings that state a minimum ask for 7 years of experience at the median; the middle half ask for 4 to 10 years (681 postings).
- Education
- 661 of the 1,384 open Civil Engineering jobs (48%) ask for a bachelor's degree or higher.
Counted across the open, public US postings on Olive Jobs on November 4, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.
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