Treatment Plant - Outside Sales Representative

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 This role focuses on supporting large‑scale water, wastewater, and critical infrastructure projects specializing in treatment plants.

The Outside Sales Representative builds and maintains strong relationships with municipalities, engineers and contractors engaged in major civil and mechanical infrastructure work. This position requires significant field engagement, technical aptitude, and the ability to manage complex project scopes from pre-bid design through delivery.

Key Responsibilities Project & Scope Management Manage project workloads for Treatment plant and critical infrastructure projects.

Present customer‑provided material lists and complete bill‑of‑material packages.

Coordinate multi‑stage shipments to align with construction schedules utilizing project management team.

Ensure accuracy, timeliness, and execution throughout each project lifecycle.

Technical Expertise & Solution Support Apply strong knowledge of water, wastewater, and civil/mechanical processes.

Support customers with product recommendations, technical clarifications, and system‑level solutions.

Maintain expertise in core product categories:

PVF (pipe, valves, fittings)
HDPE and fusion equipment

Operators, actuators, and related plant components

Quotation & Drafting Collaboration Partner with internal quotation, estimating and pre-bid manager teams:

Plant‑specific scopes

Detailed infrastructure material takeoffs

Design‑build support packages

Ensure customers receive accurate, comprehensive, and timely proposals.

Business Development & Market Expansion Identify new opportunities across water , wastewater, and municipal ecosystems.

Develop relationships with engineering firms, public agencies, and major developers.

Attend industry events, associations, and trade shows to expand presence and pipeline.

Conduct market research to identify growth opportunities within the region.

Customer Relationship Management Serve as the primary point of contact for plant‑related and infrastructure accounts.

Maintain deep, consultative relationships that drive long‑term loyalty.

Act as a trusted resource for technical guidance, product sourcing, and project planning.

Preferred Qualifications 4+ years of industry‑related outside sales experience (waterworks, civil, mechanical, or distribution).Experience supporting large infrastructure or plant environments (water/wastewater treatment and industrial civil projects).Strong technical aptitude: engineering background (especially civil) is a plus.

Ability to read and interpret plans, specs, material lists, and engineered designs.

Demonstrated ability to manage complex scopes and multi‑phase projects.

Seeking someone with a strong determination to be a successful outside sales representative.

Environmental

Job Requirements Typically, in a comfortable environment but with regular exposure to factors such as temperature extremes, moving machinery, loud noises, and fumes, which may cause noticeable discomfort.

Typically requires overnight travel more than 50% of the time.

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: $46,011.16 - $65,730.23 per year.

Core & Main…