- The Certified Stormwater Manager exam is 150 computer-based multiple-choice questions with a maximum of 3 hours 30 minutes.
- Item counts by domain: Program Management 67, Water Quality and Quantity 68, Operations and Maintenance 15.
- The exam fee is USD 500, and you must schedule at least 30 days ahead.
- New eligibility applications closed after June 30, 2026; APWA plans a new stackable model in 2027.
What This Credential Is (and Is Not)
Certified Stormwater Manager is a credential administered by the American Public Works Association (APWA). It targets people who run, design, regulate or maintain stormwater programs, usually inside public entities. If you landed here searching for another credential that shares the same three letters, this page does not cover it. For background on the acronym, see What Does CSM Stand For? and What Is CSM Certification?.
One status point matters before anything else: this is the original CSM examination, open only to previously approved candidates whose eligibility has not expired. New eligibility applications closed after June 30, 2026. APWA has announced a new stackable CSM model for 2027, and existing holders who recertify keep their CSM status. This cheat sheet is built around the exam as it currently exists, and it is most useful for candidates already approved and sitting inside their eligibility window.
Exam Format at a Glance
| Item | What to Know |
|---|---|
| Question count | 150 multiple-choice questions |
| Delivery | Computer-based through Questionmark Secure |
| Time | Maximum of 3 hours 30 minutes |
| Proctoring | Candidate-arranged, approved, physically present proctor at work or at a compatible testing center |
| Book policy | Closed book |
| Calculator | Embedded calculator and whiteboard; a silent, nonprogrammable, solar-powered calculator is also permitted |
| Exam fee | USD 500, plus testing-center fees when applicable |
| Scheduling | At least 30 days ahead |
| Retakes | New application, new fee and a 90-day wait, all within the eligibility period |
Two format details trip people up. First, the proctor is your responsibility. APWA does not assign one; you arrange an approved, physically present proctor yourself, either at work or at a compatible testing center. Second, there is a source conflict on timing: an undated informational flyer mentions a minimum of 3.5 hours, while the current exam page states a maximum. This article follows the current exam page, so plan for up to 3 hours 30 minutes rather than a guaranteed block.
For a candid look at how demanding the format feels, read How Hard Is the CSM Exam?. For scheduling mechanics, CSM Exam Dates 2026 goes deeper.
The Three Domains, Item by Item
The three headings below are the official exam objectives from APWA's content outline, with its published item allocations.
| Domain | Published Items | Subtopics |
|---|---|---|
| Program Management | 67 | Overall Stormwater Management, Program Administration, Communication/Education, Planning and Design |
| Water Quality and Quantity | 68 | Regulatory Programs, Structural Best Management Practices, Hydrology and Hydraulics |
| Operations and Maintenance | 15 | Operations and maintenance of stormwater systems and practices |
Water Quality and Quantity is the largest domain by item count, though Program Management is only one item behind. Together those two domains account for 135 of the 150 items. Operations and Maintenance is small but not ignorable: 15 questions can decide a close result, and it is the domain people most often skim because it feels like "field work" rather than exam material.
Program Management Quick Facts
This domain (67 items) reads like the job description of a stormwater program manager. It spans four subtopics, and each rewards a different kind of knowledge.
Overall Stormwater Management
The big-picture framing of why stormwater programs exist and how the pieces fit together.
- How a municipal program coordinates regulation, capital projects, maintenance and outreach
- The relationship between watershed-scale goals and site-level controls
- Roles of agencies and the public entities that run programs
Program Administration
The management side: staffing, budgets, funding and records.
- How programs are funded and how program costs are tracked
- Documentation, reporting and recordkeeping expectations
- Coordinating staff, contractors and other departments
Communication/Education
Public involvement and outreach, which questions often frame as scenarios.
- Choosing audiences and messages for outreach campaigns
- Public participation and stakeholder communication
- Educating residents, businesses and development partners about pollution prevention
Planning and Design
Where program management meets engineering concepts.
- Integrating stormwater considerations into land-use planning and development review
- Design criteria and standards a program might adopt
- Evaluating alternatives against program goals
Because the exam is written for candidates with real public-sector experience, expect scenario-style stems that ask what a manager should do next, not what a definition says. Your work history is an asset here; lean on it, then verify against the outline.
Water Quality and Quantity Quick Facts
This is the largest domain at 68 items, and it blends regulation with technical content. Budget the most study time here.
Regulatory Programs
Know the regulatory framework that drives municipal stormwater work in the United States: the permitting structure for municipal storm sewer systems, construction and industrial discharges, and the way regulatory requirements translate into local program elements like illicit discharge detection and post-construction controls. The skill being tested is connecting a requirement to a program action.
Structural Best Management Practices
Be able to recognize common structural practices, what each is designed to do, and where each fits. Typical comparison points include:
- Which practices primarily detain flow versus treat pollutants
- Which practices rely on infiltration and what site conditions limit them
- Sizing and siting considerations at a conceptual level
- Typical failure modes and what they signal for maintenance
Hydrology and Hydraulics
Expect calculation-flavored questions, which is where the embedded calculator and whiteboard come in. Concepts to have cold include rainfall and runoff relationships, how land cover affects runoff volume and peak flow, time of concentration, and basic open-channel and pipe flow ideas. Practice working a problem from stem to answer under time pressure rather than only reading about the formulas.
Key Takeaway
Treat Hydrology and Hydraulics as a skill, not a reading topic. Work calculation problems by hand with the same type of calculator you will carry into the exam, so the keystrokes are automatic on test day.
Operations and Maintenance Quick Facts
Only 15 items, but they are some of the most practical on the exam. Think about the lifecycle of stormwater infrastructure after it is built: inspection, routine upkeep, repair and long-term performance.
- Inspection frequency and what an inspector is looking for in common practices
- Routine maintenance tasks versus major rehabilitation
- How maintenance responsibility is assigned and tracked
- Connecting observed conditions (sediment buildup, standing water, erosion) to likely causes
The best way to prepare is to connect this domain back to the structural practices you studied under Water Quality and Quantity. Every practice you can name should also have a maintenance story attached to it.
Fees, Scheduling and Proctoring
The mechanics are straightforward but unforgiving of last-minute planning.
| Cost Item | Amount |
|---|---|
| Exam fee | USD 500 |
| Testing-center fees | Charged separately when applicable |
| Closed eligibility route fee (historical) | USD 195 members / USD 245 nonmembers |
| Renewal fee | USD 195 members / USD 245 nonmembers |
Build your timeline backward from the 30-day scheduling requirement. Lining up a proctor (or a compatible testing center) takes real lead time, and a missed attempt triggers the retake rules: a new application, a new fee and a 90-day wait, all of which must fit inside your eligibility period. If your eligibility clock is already running down, a failed attempt can be costly. The full cost picture is in CSM Certification Cost 2026.
Eligibility, Renewal and the 2027 Shift
Legacy Eligibility Pathways
Candidates qualified through education plus relevant stormwater experience, with the experience gained within or for public entities:
| Education | Required Experience |
|---|---|
| High-school diploma or equivalent | 7 relevant years |
| Associate degree or trade certificate | 5 years |
| Bachelor's degree | 3 years |
| Master's degree | 2 years |
| Doctorate | 1 year |
Applicants also needed supervisor and HR verification and an affirmation of professional conduct. That route is now closed to new applicants, which is why this credential is best understood as a legacy exam for approved candidates. Details on the old pathways are in CSM Requirements 2026.
Keeping the Credential
Certification lasts 5 years. Renewal by professional development requires 100 credits, and the current webpage and linked 2023 application specify 20 credits per year. The renewal fee is USD 195 for members and USD 245 for nonmembers. One nuance: the linked recertification application also permits passing the examination for recertification, but the current webpage and credit guidelines do not describe that alternative, so confirm with APWA before relying on it.
What Changes in 2027
APWA plans a new stackable CSM model in 2027, and existing holders who recertify retain their CSM status. If you are weighing whether the credential is still a smart investment given this transition, Is the CSM Certification Worth It? and CSM Salary Guide 2026 walk through the trade-offs without inventing numbers.
A Domain-Weighted Review Order
Rather than a generic schedule, sequence your review by item count and by how the domains build on each other. Water Quality and Quantity goes first and longest because it holds the most items and its content (practices, hydrology) feeds the maintenance questions.
Water Quality and Quantity (68 items)
- Regulatory Programs: map each requirement to a program element
- Structural BMPs: build a one-line function, siting and maintenance note per practice
- Hydrology and Hydraulics: daily hand calculations with your approved calculator
Program Management (67 items)
- Program Administration and Overall Stormwater Management: funding, staffing, reporting
- Communication/Education and Planning and Design: scenario questions
Operations and Maintenance (15 items) plus full review
- Pair every BMP with its inspection and upkeep checklist
- Timed practice sets to rehearse pacing across 150 questions
For a broader plan with resources and pacing, see the CSM Study Guide 2026. APWA also publishes a recommended reading list; use it to choose references, but note that we did not review the full texts of the books on it. When you are ready to test yourself against realistic questions, take a timed set on the CSM practice test site, and revisit the main practice test after each domain block to check retention.
FAQ
The exam has 150 computer-based multiple-choice questions delivered through Questionmark Secure, with a maximum of 3 hours 30 minutes. By APWA's published allocations, 67 items fall under Program Management, 68 under Water Quality and Quantity, and 15 under Operations and Maintenance.
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 APWA's current program page for the latest status.
The exam is closed book. You get an embedded calculator and whiteboard, and a silent, nonprogrammable, solar-powered calculator is also permitted. Because you arrange your own approved, physically present proctor, confirm the allowed items with them in advance.
A retake requires a new application, a new fee and a 90-day wait, all within your eligibility period. That makes timing important: if your eligibility is close to expiring, a failed attempt may leave no room for another try.
Certification lasts 5 years. Renewal by professional development requires 100 credits, specified as 20 per year on the current webpage, with a renewal fee of USD 195 for members or USD 245 for nonmembers. The recertification application also mentions passing the exam, so confirm that option directly with APWA.
Keep this sheet beside your study materials, and cross-check anything high-stakes, especially fees, dates and eligibility, against APWA's current CSM program page, since the credential is in transition.