AWT Certified Water Technologist (CWT) Practice Test
Build your confidence for AWT Certified Water Technologist (CWT). Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
Water treatment certification covering industrial water systems, boiler water, cooling water, chemical treatment programs, and microbiological control. Administered by Association of Water Technologies. Key domains include Boiler Water Treatment, Cooling Water and Closed System Treatment, External Treatment and General Water Treatment Knowledge. The exam consists of 200 questions over 240 minutes.
Sample Questions
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A cooling tower serving a data center is at 5.5 cycles. Basin pH is 8.8, calcium hardness is 820 mg/L as CaCO3, skin temperatures are high, and white scale appears on the condenser tube sheet. Which action best addresses the controlling risk? The service packet is dated 2025-08-07, lists asset tag CWT-020, and includes an unrelated note that the night operator changed shifts last week.
A conductivity controller on a 600-ton cooling tower shows stable readings near the set point, but grab samples from the tower basin are 35 percent higher. The probe is mounted in a bypass line that is valved almost closed, and the inhibitor pump is paced from the controller relay. Which correction is most defensible? The service packet is dated 2025-03-10, lists asset tag CWT-003, and includes an unrelated note that the night operator changed shifts last week.
A survey finds carbon steel piping, copper alloy condenser tubes, stainless pump trim, and a magnesium anode installed in the same closed condenser loop. Conductivity is low, nitrite is on target, but copper is increasing in samples after a pump replacement. What should the CWT evaluate first? The service packet is dated 2025-02-07, lists asset tag CWT-002, and includes an unrelated note that the night operator changed shifts last week.
A customer sends monthly boiler logs showing sulfite, phosphate, pH, conductivity, feedwater hardness, and condensate iron. The values are mostly within control ranges, but condensate iron has doubled over three months and makeup percentage is unchanged. Which monitoring response is best? The service packet is dated 2025-06-19, lists asset tag CWT-006, and includes an unrelated note that the night operator changed shifts last week.
A technician is asked to enter a below-grade cooling tower basin to retrieve a dropped coupon rack. The tower is offline, but adjacent pumps can auto-start, and the basin has residual biocide odor. What control is required before entry? The service packet is dated 2025-11-07, lists asset tag CWT-083, and includes an unrelated note that the night operator changed shifts last week.
Exam insights and study advice
In the real world, the performance and longevity of multi-million-dollar industrial assets-from power plant boilers to hospital cooling towers-depend entirely on precise water treatment. A CWT-certified professional possesses the proven, holistic knowledge to prevent catastrophic failures like scaling, corrosion, and microbiological fouling, which can lead to unscheduled downtime, massive repair costs, and safety hazards. This certification translates directly into operational reliability, regulatory compliance, and significant cost savings for clients, establishing the holder as a trusted advisor capable of protecting critical infrastructure.
What this exam covers
01Boiler Water Treatment
This section addresses intricate boiler system design, inspection procedures, accurate sampling and analytical testing methodologies, potential corrosion and deposit problems, and the operational limitations of specific internal treatment programs.
02Cooling Water and Closed System Treatment
Candidates explore cooling water system knowledge, precise sampling techniques, analytical testing protocols, corrosion control strategies, deposit and scale management, microbiological fouling prevention, and closed loop system maintenance procedures.
03External Treatment
This domain focuses on zeolite softeners, boiler feedwater deaeration processes, external treatment terminology, and fundamental water chemistry principles required to properly condition and prepare industrial water supplies before they enter sensitive systems.
04General Water Treatment Knowledge
This general domain addresses basic water treatment chemistry, metallurgy, feed control equipment, heat transfer principles, system monitoring procedures, and federal environmental affairs that impact daily industrial water management operations across facilities.
05Health, Safety, and Environment
This final domain covers maintaining personnel and physical plant safety standards, accurate identification of federal environmental regulations, and the correct procedures for the safe disposal of treated waters in industrial settings.