- CSM here means Certified Stormwater Manager, issued by the American Public Works Association (APWA).
- The exam is 150 computer-based multiple-choice questions with a maximum of 3 hours 30 minutes.
- The outline allocates 67 items to Program Management, 68 to Water Quality and Quantity, and 15 to Operations and Maintenance.
- New eligibility applications closed after June 30, 2026; APWA plans a new stackable model in 2027.
What CSM Means Here
Several unrelated professional credentials share the three-letter acronym "CSM," so it is worth being precise. On this site, CSM stands for Certified Stormwater Manager, a professional credential for people who manage stormwater programs, infrastructure, and compliance, typically inside public agencies. If you arrived looking for a credential from another field, this article does not cover it. If you want a shorter orientation on the acronym itself, see our pages on what CSM stands for and what CSM means.
The Certified Stormwater Manager credential signals that a person has demonstrated working knowledge across the full stormwater management lifecycle: running a program, understanding how water behaves and how it is regulated, and keeping built systems functioning over time. It is a practitioner credential, not an academic one, and its eligibility rules were built around years of relevant stormwater experience rather than coursework alone.
Who Issues It and Where It Stands Today
The credential is administered by the American Public Works Association (APWA), the professional body for public works practitioners. That context matters: stormwater is a public works function, and the exam reflects the concerns of municipal, county, and state programs.
In practical terms, this means two audiences read about CSM today. The first is candidates already approved under the legacy route who are preparing to sit the exam before their eligibility expires. The second is professionals evaluating the credential's long-term value as APWA transitions to its new model. Our ROI analysis of the CSM certification and our overview of CSM requirements expand on both situations.
Exam Format and Testing Mechanics
The CSM exam is a 150-question, computer-based, multiple-choice test delivered through the Questionmark Secure platform. Candidates have a maximum of 3 hours 30 minutes. (One older informational flyer describes the time as a minimum of 3.5 hours, but the current exam page specifies a maximum, and that is the version to plan around.)
Proctoring and Scheduling
Unlike many credentials that send you to a single commercial testing network, APWA's model places responsibility on the candidate to arrange a proctor. The proctor must be approved and physically present, and testing can occur at your workplace or at a compatible testing center. Schedule at least 30 days ahead. If you use a testing center that charges its own fee, that cost is separate from the APWA exam fee.
Rules Inside the Exam
- The exam is closed book.
- An embedded calculator and a whiteboard are available on screen.
- A silent, nonprogrammable, solar-powered calculator is permitted.
Because hydrology and hydraulics questions can involve quantitative reasoning, practicing with the same style of calculator you will bring is worthwhile. For a deeper look at how demanding the test is, see how hard the CSM exam is, and for scheduling logistics see CSM exam dates and deadlines.
The Three Content Areas
APWA's Certified Stormwater Manager Examination Content Outline organizes the test into three areas. The outline, which carries a 2008 copyright, publishes item counts rather than percentage weights, so this article reports counts only. Of the 150 questions, 67 fall under Program Management, 68 under Water Quality and Quantity, and 15 under Operations and Maintenance.
Domain 1: Program Management (67 items)
This area covers how a stormwater program is run as an organization, not just as an engineering exercise.
- Overall Stormwater Management: the big-picture framework for how a program operates.
- Program Administration: the day-to-day management of staff, budgets, records, and compliance obligations.
- Communication/Education: public outreach, stakeholder engagement, and explaining stormwater requirements to residents, developers, and officials.
- Planning and Design: integrating stormwater considerations into development review, site design, and long-range planning.
Domain 2: Water Quality and Quantity (68 items)
The largest allocation by item count, and the most technical.
- Regulatory Programs: the permit and compliance landscape that governs municipal stormwater.
- Structural Best Management Practices: how engineered controls are selected, sized, and applied to manage runoff volume and pollutants.
- Hydrology and Hydraulics: how runoff is generated, how it moves through channels and pipes, and the calculations that describe it.
Domain 3: Operations and Maintenance (15 items)
The smallest area by count, but one that practitioners rarely underestimate, since infrastructure that is not maintained stops performing.
- Keeping stormwater systems and controls functioning after construction.
- Inspection and upkeep responsibilities that connect back to program and regulatory obligations.
Notice how the first two areas together account for the large majority of the exam. A candidate who is strong operationally but has never worked on permits, hydrology, or program administration needs to close those gaps first. Our complete guide to the three CSM exam domains goes deeper on each area.
Eligibility Pathways (Legacy Route)
The original application route paired education with years of relevant experience. Candidates needed a high-school diploma or equivalent plus 7 relevant years, an associate degree or trade certificate plus 5, a bachelor's degree plus 3, a master's degree plus 2, or a doctorate plus 1.
| Education Level | Relevant Experience Required |
|---|---|
| High-school diploma or equivalent | 7 years |
| Associate degree or trade certificate | 5 years |
| Bachelor's degree | 3 years |
| Master's degree | 2 years |
| Doctorate | 1 year |
The stormwater experience had to be gained within or for public entities. Applicants also needed supervisor and HR verification of that experience and had to affirm professional conduct. Because this application route has closed to new applicants, the table is mainly useful for understanding how the credential was designed and who holds it. Details on qualification live in our CSM requirements guide.
Fees and Costs
Costs fall into a few buckets. The exam fee is USD 500, with any testing-center fees charged separately when applicable. The closed eligibility route charged USD 195 for APWA members or USD 245 for nonmembers.
| Item | Amount |
|---|---|
| Exam fee | USD 500 |
| Eligibility application (closed route) | USD 195 member / USD 245 nonmember |
| Renewal fee | USD 195 member / USD 245 nonmember |
| Testing-center fees | Separate, when applicable |
For a fuller budget view, including how members and nonmembers compare, read our CSM certification cost breakdown.
Who Hires Certified Stormwater Managers
Because the experience requirement centered on work within or for public entities, the typical CSM holder works in or alongside government. Common employers and roles include:
- Municipal and county public works departments, where stormwater managers oversee permits, inspections, and capital projects.
- State and regional agencies that administer or enforce stormwater regulations.
- Consulting and engineering firms that support public clients with program management, design review, and compliance work.
- Utilities and special districts responsible for drainage and water-quality programs.
Job titles vary widely, and the credential is more often a differentiator for senior or supervisory roles than a strict hiring requirement. We cover what to expect in CSM jobs and in our salary analysis, where we avoid unsupported figures and explain how pay tends to vary by region, employer type, and seniority.
Staying Certified: The Five-Year Cycle
Certification lasts 5 years. Renewal by professional development requires 100 credits; the current APWA webpage and the linked 2023 application specify 20 credits per year. Renewal fees are USD 195 for members and USD 245 for nonmembers.
Key Takeaway
The linked recertification application also permits passing the examination for recertification, but the current webpage and the credit guidelines do not describe that alternative. If you intend to recertify by exam, confirm directly with APWA before relying on it. Planning on the professional-development route is the safer assumption.
Holders who recertify retain their CSM status even as APWA moves toward its new stackable model in 2027. That continuity is one reason existing certificants often find the credential worth maintaining.
A Domain-Based Prep Sequence
Rather than generic advice, tie your sequence to how the exam is built. Because Program Management and Water Quality and Quantity together dominate the item count, they deserve most of your calendar, while Operations and Maintenance rewards a shorter, focused pass. Start from the official content outline, since it is the authoritative statement of what can appear on the test. A suggested allocation:
Program Management
- Work through administration, outreach, and planning and design topics.
- Practice scenario-style questions about program decisions.
Water Quality and Quantity
- Spend the most time here: regulatory programs, structural BMPs, and hydrology and hydraulics.
- Drill calculations using the same calculator you will bring.
Operations and Maintenance, then review
- Cover the smaller domain, then take a full-length timed practice session.
- Revisit weak areas from your results.
For a broader plan, see our CSM study guide and the quick-reference CSM cheat sheet. When you are ready to test yourself, the CSM Exam Prep practice test lets you rehearse question style and pacing before the real attempt, and you can explore more practice options on the main CSM Exam Prep site.
Frequently Asked Questions
CSM stands for Certified Stormwater Manager, a credential administered by the American Public Works Association (APWA). It is distinct from other credentials that share the same acronym.
The exam has 150 computer-based multiple-choice questions delivered through Questionmark Secure, with a maximum of 3 hours 30 minutes. It is closed book, with an embedded calculator and whiteboard available.
New eligibility applications closed after June 30, 2026. The original exam remains available to previously approved candidates whose eligibility has not expired. APWA plans a new stackable CSM model in 2027, so check the APWA program page for current details.
The exam fee is USD 500, plus separately charged testing-center fees when applicable. The closed eligibility route charged USD 195 for members or USD 245 for nonmembers. See our cost breakdown for the full picture.
A retake requires a new application, a new fee, and a 90-day wait, all within your eligibility period. Because eligibility is time-limited, plan your first attempt carefully and schedule at least 30 days ahead.
For more background on the credential itself, you may also want to read our overviews of what CSM certification is and the options for CSM training.