- The Two-Exam Pathway: Why This Is Not a Single Test
- Choosing Sprinkler or Drip/Micro
- General Agriculture: Seven Domains to Master
- Drip/Micro Specialty: Nine Domains
- Sprinkler Specialty: Four Domains
- Registration, Fees and Retake Mechanics
- Test-Day Rules: Calculators, Formulas and the Clock
- A Study Sequence Built Around the Weightings
- After You Pass: Renewal and CEUs
- Frequently Asked Questions
- Certified Irrigation Designer - Agriculture means two exams: General Agriculture plus either Sprinkler or Drip/Micro, both passed within three years.
- Sprinkler Type carries 40%-50% of the Sprinkler exam, the heaviest single weighting in the pathway.
- Hydraulics appears in all three outlines, so mastering friction loss and pressure calculations pays off twice.
- Passing standards usually fall between 70% and 75% but vary by exam form.
The Two-Exam Pathway: Why This Is Not a Single Test
The first thing to understand about the Certified Irrigation Designer - Agriculture credential is that it is administered by the Irrigation Association (IA) as the agriculture track of the broader Certified Irrigation Designer (CID) program. You do not sit one exam and walk away certified. You complete a two-exam pathway, and getting that structure wrong is the most common way candidates waste money and months.
The pathway works like this:
- General Agriculture exam: 150 multiple-choice questions, 4 hours.
- Specialty exam, Sprinkler: 50 multiple-choice questions, 4 hours. Total pathway: 200 questions.
- Specialty exam, Drip/Micro (alternative): 75 multiple-choice questions, 4 hours. Total pathway: 225 questions.
You take General Agriculture plus one specialty, never both specialties as part of the same certification. Both exams must be passed within three years of your application. That three-year window is generous, but it is also a hard deadline, so plan the sequence deliberately rather than letting the second exam drift.
If you are still orienting yourself to the credential, our overview article What Is CID-AG? covers the basics, and the CID-AG Exam Domains guide walks through all 20 content areas in detail. This study guide focuses on turning that structure into a preparation plan.
Choosing Sprinkler or Drip/Micro
Your specialty choice shapes your whole study plan, so make it early. The decision usually comes down to the systems you actually design and the crops you serve, but the exam structures differ enough that they deserve a direct comparison.
| Factor | Sprinkler | Drip/Micro |
|---|---|---|
| Specialty questions | 50 | 75 |
| Total questions with General Agriculture | 200 | 225 |
| Number of outlined domains | 4 (Domains 17-20) | 9 (Domains 8-16) |
| Dominant topic | Sprinkler Type (40%-50%) | System Design/Economics (20%-25%) |
| Content shape | Narrow and deep | Broad across many topics |
The Sprinkler exam is shorter and concentrated: nearly half the questions fall under a single domain. That rewards candidates who know sprinkler types, characteristics and selection cold. The Drip/Micro exam spreads its weight across filtration, injection, emitting devices, design, hydraulics, scheduling and more, which favors candidates who are comfortable context-switching between topics.
Neither is automatically easier. For a candid look at difficulty, see How Hard Is the CID-AG Exam?, and for what passing means numerically, read CID-AG Passing Score.
General Agriculture: Seven Domains to Master
The General Agriculture exam is the larger of the two at 150 questions and 4 hours, and it is the foundation for everything else. Its seven domains and their official weightings are:
Domain 2: Hydraulics (20%-25%)
The largest General Agriculture domain and the one that touches every other area of the pathway.
- Friction loss in pipes and fittings
- Pressure and flow relationships through a system
- Elevation effects on available pressure
- Sizing pipe for acceptable pressure variation
Domain 1: Pumps (15%-20%)
Pump selection, performance and operation within agricultural systems.
- Reading pump curves and matching a pump to a system curve
- Power and efficiency considerations
- How system changes shift the operating point
Domain 4: Soil-Water-Plant Relations (15%-20%)
The agronomic core: what the soil holds, what the crop needs, and how irrigation bridges the two.
- Soil water holding characteristics
- Crop water use and rooting behavior
- Allowable depletion concepts
Domains 5, 6 and 7 (10%-15% each)
Scheduling, Efficiency/Uniformity and System Components each carry the same range.
- Scheduling: deciding when and how much to irrigate
- Efficiency/Uniformity: how well applied water reaches the crop
- System Components: valves, controls, mainlines and other hardware
Domain 3: Economics (5%-10%)
The lightest General Agriculture domain, but do not skip it. Economic questions are often among the most approachable on the exam if you have practiced the basic cost comparison approach.
Notice that Hydraulics plus Pumps plus Soil-Water-Plant Relations can account for a majority of the General Agriculture questions. That is where your hours should concentrate.
Drip/Micro Specialty: Nine Domains
If you choose Drip/Micro, you face nine domains across 75 questions. The weightings are:
- Domain 8, System Design/Economics: 20%-25%
- Domain 9, Hydraulics: 15%-20%
- Domain 10, Filtration: 15%-20%
- Domain 15, Efficiency/Uniformity: 10%-15%
- Domain 11, Emitting Devices: 5%-10%
- Domain 12, Injection: 5%-10%
- Domain 13, Soil-Water-Plant Relations: 5%-10%
- Domain 14, Scheduling: 5%-10%
- Domain 16, Pumps: 1%-5%
Filtration and Injection: the drip-specific hurdles
These two domains separate drip designers from everyone else. Emitter passages are tiny, so water quality and filtration are a design requirement, not an afterthought.
- Matching filter type to the water source and contaminant load
- Filter sizing and pressure loss across filters
- Chemigation and fertigation injection methods and the equipment involved
Because the Drip/Micro outlines repeat several General Agriculture topics (hydraulics, scheduling, efficiency/uniformity, soil-water-plant relations, pumps), the exam tests them at a drip-specific level. Know the general principle first, then learn how it changes for low-flow, low-pressure emitters.
Sprinkler Specialty: Four Domains
The Sprinkler outline is short but unforgiving, because one domain dominates:
- Domain 20, Sprinkler Type: 40%-50%
- Domain 18, Hydraulics: 20%-25%
- Domain 17, Pumps and Power: 15%-20%
- Domain 19, Scheduling: 10%-15%
Sprinkler Type covers the families of agricultural sprinkler systems and the design implications of each. Expect questions that ask you to choose or evaluate a system type for a situation, which means understanding trade-offs rather than memorizing definitions. The Hydraulics and Pumps and Power domains then test the supporting calculations.
Registration, Fees and Retake Mechanics
Costs are per exam, and since you take two exams, you should budget for both from the start. The initial fees are:
| Item | IA Member | Nonmember |
|---|---|---|
| Initial fee, per exam | $250 | $495 |
| Calculated two-exam total | $500 | $990 |
| Retake, per exam | $200 | $325 |
The gap between member and nonmember pricing is substantial across two exams, so run the numbers on membership before you register. Our CID-AG Certification Cost breakdown lays out the full pricing picture, including renewal.
Testing is delivered at Kryterion testing centers, with some IA paper-and-pencil administrations offered as well. At-home proctoring has not been verified, so do not plan around it. For scheduling windows and deadlines, check CID-AG Exam Dates.
Experience recommendations, not requirements
Experience and education are recommended rather than mandatory. The handbook suggests either three years in the field or two years in the field plus one related educational year. No required prep course, degree or reference count has been identified. You can read the full eligibility picture in CID-AG Requirements.
Test-Day Rules: Calculators, Formulas and the Clock
Both exams are closed book. You will be provided with formula material and scratch paper, so your job is not to memorize every equation but to know which one applies and how to use it quickly.
- Calculators: silent, battery-powered, nonprinting calculators are permitted, and programmable models are allowed.
- Not permitted: phone, tablet or watch calculators.
- Breaks: breaks do not stop the clock.
- Time: each exam is allotted 4 hours. The eight-hour exam line you may see is the aggregate allowance across the two sittings, not a single eight-hour session.
Key Takeaway
Practice with the exact calculator you will bring, and practice in four-hour blocks. A 150-question General Agriculture sitting is a stamina event as much as a knowledge test, and an unfamiliar calculator costs you time on every hydraulics problem.
Because the formula material is supplied, hydraulics and pump questions become exercises in setup and unit handling. Most lost points here come from unit conversion slips, not from not knowing the formula. Drill unit consistency until it is automatic.
A Study Sequence Built Around the Weightings
The right order of study follows from how the domains overlap. Hydraulics shows up in all three outlines (Domains 2, 9 and 18), so learning it well first benefits both exams. The sequence below assumes a Sprinkler specialty path; Drip/Micro candidates should swap the final block for filtration, injection and emitting devices.
Hydraulics foundation
- Friction loss, pressure, elevation and flow relationships
- Work problems with provided formula sheets to build setup speed
- Why first: it feeds Domains 2, 9 and 18
Pumps and soil-water-plant relations
- Pump curves, operating points, power considerations
- Soil water holding, crop water use, allowable depletion
Scheduling, efficiency and components
- Scheduling logic and uniformity concepts
- System components and economics basics
- Sit a timed General Agriculture practice block
Specialty deep dive
- Sprinkler: sprinkler types first, then specialty hydraulics and pumps and power
- Drip/Micro: system design, filtration, then injection and emitting devices
Full-length simulation
- Four-hour timed sittings with your actual calculator
- Review misses by domain and rebalance remaining time
Consider sitting General Agriculture first, then the specialty, since the specialty builds on general hydraulics and scheduling concepts. You have three years across both, so there is no need to rush the second sitting, but do not let your General Agriculture knowledge go stale either. For a fast refresher near exam time, our CID-AG Cheat Sheet condenses the must-know facts, and you can pressure-test yourself with questions on the CID-AG practice test site.
After You Pass: Renewal and CEUs
Certification is not a one-time event. Renewal is annual at $75 for members and $125 for nonmembers, plus $25 for each additional certification held. Over each two-year period you need 20 continuing education units, including at least 10 irrigation-related units and at least 5 Tier 1 or water-efficient units.
Plan for these ongoing costs when evaluating the credential. Whether the return justifies the investment is covered in Is the CID-AG Certification Worth It?, and the CID-AG Jobs article looks at who employs certified designers, from irrigation dealers and design firms to agricultural consultants and equipment manufacturers.
Frequently Asked Questions
No. The two exams are separate sittings, each allotted 4 hours. You must pass both within three years of your application, so you can space them out as long as you stay inside that window.
The passing standard is form-dependent and usually falls between 70% and 75%, rather than a single fixed cutoff for every exam. See CID-AG Passing Score for more detail on how to interpret this.
The standard pathway is General Agriculture plus one specialty. Holding an additional certification carries an extra $25 annual renewal charge, which suggests additional certifications are possible, but confirm current procedures with the Irrigation Association.
Yes. Silent, battery-powered, nonprinting calculators are permitted, including programmable models. Phone, tablet and watch calculators are not allowed, and formula material and scratch paper are provided.
Start with Hydraulics, which appears in all three outlines at 15%-25%. Then focus on your specialty's largest domain: Sprinkler Type (40%-50%) for Sprinkler, or System Design/Economics (20%-25%) for Drip/Micro.