MS4 Compliance Specialist II

Join Our Team as an MS4 Compliance Specialist II at ARRO Consulting! ARRO Consulting, Inc. has been strengthening and protecting communities since 1946 through innovative engineering and environmental solutions. As a mid-sized firm on a high-growth trajectory, we are expanding our stormwater services and deepening our partnerships with municipalities across the region. We’re building the structure today for where we want to be tomorrow — and we’re looking for passionate professionals ready to grow with us. We deliver exceptional results for our clients while supporting the professional growth of our team members. Experience meaningful work and career advancement at ARRO — where your impact matters and your ambitions can thrive. Position Overview ARRO is seeking a Municipal Stormwater (MS4) Compliance Specialist II to support municipalities in meeting regulatory stormwater requirements and advancing resilient water quality initiatives. In this role, you will serve as a trusted technical partner to municipal clients, helping them navigate MS4 permit obligations, develop stormwater projects, and implement best practices that protect local waterways. This position blends fieldwork, analysis, project coordination, and client engagement. You will collaborate with multidisciplinary teams — including engineering, GIS, planning, and environmental staff — to deliver high-quality, compliant, and forward-thinking stormwater solutions. If you’re driven by environmental stewardship, technical problem-solving, and community impact, this role offers an exciting opportunity to grow your career within a mission-driven organization. Key ResponsibilitiesMunicipal & Regulatory Support

• Assist municipalities with all aspects of MS4 permit compliance and regulatory reporting
• Prepare, submit, and present MS4 reports, PRP/TMDL plans, pollutant loading calculations, and related technical documentation
• Conduct field inspections and on-site stormwater assessments
• Identify and evaluate stormwater BMP/SCM opportunities to support pollutant reduction goals
• Coordinate with state and local regulatory agencies regarding stormwater permitting and compliance

Technical & Project Coordination

• Collaborate with engineering and GIS teams to analyze feasibility of stormwater projects
• Support the development of municipal stormwater ordinances
• Assist with grant-funded stormwater initiatives and capital planning efforts
• Provide QA/QC for stormwater deliverables
• Participate in client meetings, public meetings, and regional stormwater events

Leadership & Team Support

• Mentor and support MS4 Specialist I staff or interns (as applicable)
• Support business development efforts, including scoping, budgeting, and proposal input
• Represent ARRO in professional and municipal settings

Qualifications

• Bachelor’s degree in Civil Engineering, Environmental Science, Biology, GIS, or related field
• 4–6 years of relevant experience in MS4 compliance, stormwater management, or environmental services
• 1–3 years of experience developing PRP/TMDL plans and conducting stormwater utility inspections
• Experience using GIS platforms
• Knowledge of BMPs/SCMs, erosion and sediment control, drainage systems, and stormwater utilities
• Familiarity with federal, state, and local stormwater regulations
• Experience with green infrastructure projects is beneficial
• CAD/modeling software experience is a plus
• Ability to stay current with evolving stormwater regulations
• Willingness to learn Office365 applications, including Power Apps
• Strong communication skills, analytical abilities, and collaborative approach

Work Environment

• Combination of office, remote, and fieldwork settings
• Ability to complete outdoor fieldwork year-round and navigate municipal/industrial job sites
• Ability to lift up to 10 lbs regularly and up to 50 lbs occasionally
• Travel within a day’s drive for site visits and project needs
• Flexibility to work outside typical business hours as needed

Why ARRO? We offer a comprehensive benefits package including 401(k), medical/dental/vision insurance, PTO, paid holidays, parental leave, disability coverage, and company-paid life insurance. Compensation is based on location, experience, education, and unique skill sets. At ARRO, you’ll be part of a team dedicated to protecting water resources and supporting thriving communities — all while advancing your career in a supportive and forward-thinking environment. Apply Now to Make a Difference! EOE/AA Apply tot his job Apply To this Job