Treatment Plant Estimator II

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  to learn more.

Job Summary:

The Estimator II – Critical Infrastructure Group (CIG) is responsible for performing detailed material quantity takeoffs and supporting bid efforts for a variety of infrastructure projects with moderate complexity. This role works more independently than Estimator I, applying developing technical knowledge of materials, construction methods, and project specifications. Estimator II collaborates with sales, Pre‑Bid, and engineering teams to help ensure accurate scope development and competitive bid proposals.

Major Tasks, Responsibilities and Key Accountabilities Major Tasks, Responsibilities, and Key Accountabilities Project Evaluation & Takeoff Development Independently performs material quantity takeoffs for standard and moderately complex projects.

Interprets construction drawings, specifications, and notes to determine accurate material requirements.

Identifies specialty materials with some guidance.

Bid Strategy & Sales Support Prepares scopes and provides material lists for sales and customers with increasing independence.

Participates in pre‑takeoff and post‑takeoff discussions to support knowledge transfer.

Works with contractors and sales teams to clarify scope, project needs, and standard value‑engineering opportunities.

Vendor & Internal Collaboration Communicates with vendors to obtain basic product information, lead times, or material guidance.

Coordinates with the Pre‑Bid team to maintain accurate scope definitions.

Technical Development Continues to improve plan-reading, takeoff accuracy, and product knowledge.

Begins mentoring Estimator I personnel by answering questions and reviewing simple takeoffs.

Key Competencies Growing technical expertise in infrastructure materials

Solid analytical skills

Effective communication with internal and external partners

Ability to manage multiple tasks and deadlines

Increasing confidence in takeoff responsibilities

Preferred Qualifications 5+ years of estimation experience in water/wastewater treatment plant construction, or critical infrastructure projects

Proven experience performing detailed material quantity takeoffs from construction plan sets Strong understanding of civil and mechanical infrastructure systems

Experience2–4 years of estimation experience or related industry background

Demonstrated ability to perform accurate takeoffs from plan sets Experience engaging with contractors or vendors preferred

Education

Associate degree or Bachelor’s degree preferred

Construction Management, Engineering, or related discipline

Equivalent industry experience considered

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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