Mechanical Estimator – Water/Wastewater Treatment Plants

Based in St. Louis, Core & Main is a leader in advancing reliable infrastructure™ with local service, nationwide®. As a specialty distributor with a focus on water, wastewater, storm drainage and fire protection products and related services, Core & Main provides solutions to municipalities, private water companies and professional contractors across municipal, non-residential and residential end markets, nationwide. With over 370 locations across the U.S., the company provides its customers local expertise backed by a national supply chain. Core & Main’s 5,700 associates are committed to helping their communities thrive with safe and reliable infrastructure. Visit coreandmain.com to learn more.

Job Summary:

The Treatment Plant Estimator – Critical Infrastructure Group (CIG) supports the development of quantity takeoffs for critical infrastructure projects under direct guidance from senior estimating personnel. This role focuses on learning plan interpretation, material identification, and basic takeoff procedures. The estimator collaborates with the Pre‑Bid team, sales team, and other estimators to ensure accurate, timely bid support while building foundational estimating skills.

Major Tasks, Responsibilities and Key Accountabilities

Project Evaluation & Takeoff Support

• Assists in reviewing construction plans and specifications to identify basic material requirements.
• Performs entry-level quantity takeoffs with supervision and guidance.
• Identifies standard materials and components needed for infrastructure systems.

Bid Support & Collaboration

• Supports the preparation of scopes and basic bid packages.
• Works with the Pre‑Bid team to confirm scope details and gather required information.
• Communicate with internal team members to clarify basic project elements.

Learning & Development

• Participates in training sessions to build proficiency in takeoff software, product knowledge, and plan reading.
• Works closely with higher-level estimators to learn best practices, workflows, and company procedures.
• Accept feedback and coaching to improve accuracy and efficiency.

Key Competencies

• Strong willingness to learn and develop technical skills
• Attention to detail
• Basic problem-solving abilities
• Effective, professional communication
• Good organizational skills and ability to follow established processes

Preferred Qualifications

• Treatment plant Estimating,
• Water/Wastewater experience
• Pipe Valves Fitting product knowledge

Experience

• 0–2 years of experience in construction, engineering, or related fields
• Exposure to reading blueprints or construction documents preferred
• Prior internship, training, or coursework in construction or engineering is a plus

Education

• Associate degree or technical certificate preferred
• Coursework in Construction Management, Engineering, or related fields beneficial
• Equivalent experience considered

This information indicates the general nature and level of work performed by associates in this role. It is not designed to contain a comprehensive inventory of all duties, responsibilities, and qualifications required of associates assigned to this role. This description supersedes any previous or undated descriptions for this role. Management retains the right to add or change the duties of the position at any time.

Pay: $70,304 - $83,148.75 per year

Core & Main is an Equal Employment Opportunity employer. Employment at Core & Main is based solely on a person’s merit and qualifications directly related to professional competence.  Core & Main does not discriminate against any employee or applicant on the basis of race, creed, color, religion, national origin, nationality, ancestry, age, disability, veteran status, pregnancy or related condition (including breastfeeding), affectional or sexual orientation, gender identity or expression, marital status, status with regard to public assistance, citizenship, or any other basis protected by law.

None of the questions in this application are intended to elicit information regarding any protected characteristics, nor imply any limitation, illegal preferences or discrimination based upon non-job-related information or protected characteristics.

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