InterNACHI Pool & Spa Inspector common mistakes
InterNACHI Pool & Spa Inspector · Understand the traps and how to avoid them.
Treating the required safety barrier as a single item-checking that a fence exists but not measuring its height, testing gate self-closing/self-latching force, checking latch release height, and looking for climbable handholds or nearby objects-then declaring the barrier compliant.
Candidates default to a visual 'fence present' check because that is what most pre-listing walkthroughs emphasize, and they underestimate how many barrier defects are dimensional or functional rather than visible. The exam tests barrier specifics because drowning is the leading cause of unintentional death for young children, and most barrier failures are subtle (a latch that does not fully engage, a gate that drifts open, a fence with horizontal rails that act as a ladder).
What to do instead
Build a fixed barrier checklist you run the same way every time: minimum barrier height, maximum gap under the barrier, gate opens outward away from the water, gate self-closes and self-latches from any open position, latch release height above the ground and out of a child's reach, no climbable projections or adjacent structures, and no gaps that defeat the barrier. Practice measuring rather than eyeballing, and state measurements in your report.
Reporting the pool or spa as 'structurally sound' or 'no visible defects' after inspecting only from the deck, without entering the water or reaching the shell, and without checking the plaster/liner surface, tile line, and skimmer throats for cracks, delamination, or separation.
Candidates worry about liability, wet clothing, or time, and they confuse a non-invasive inspection with a purely visual one. The exam expects you to recognize that shell and finish defects (cracked plaster, hollow spots, liner wrinkles or tears, tile separation, cracked skimmer throat) are exactly the conditions a client is paying to learn about, and that 'no visible defects' is a claim you cannot support if you never got close.
What to do instead
Adopt a defined inspection route: walk the entire deck, then inspect the shell from the coping down at arm's length wherever access allows, tapping finish for hollow sounds, checking the tile line for missing or loose tiles, checking skimmer throats and equalizer lines for cracks, and checking the waterline for a consistent water level mark. Describe what you could and could not access rather than issuing a blanket 'sound' verdict.
Describing the circulation system generically ('pump and filter appear functional') without identifying the pump, filter type, heater, valves, and skimmer/main drain plumbing, and without documenting the presence or absence of an anti-entrapment drain cover.
Candidates memorize component names but freeze when asked to trace an unfamiliar plumbing layout, and they treat drain covers as a cosmetic detail rather than the single most important life-safety component in the system. The exam is built around component identification because an inspector who cannot name what is in front of them cannot report on its condition.
What to do instead
Study the standard circulation path until you can narrate it: skimmer and main drain to pump, pump to filter, filter to heater, heater to returns (and to any spa jet or water feature loop). Practice identifying filter types by housing shape and label, valve types by handle and port configuration, and drain covers by their stamped marking. Always report the drain cover's presence, type, and whether it appears secure and undamaged.
Failing to distinguish between a defect that is a safety hazard requiring immediate client notification and a maintenance item that can go in the narrative report, so everything lands in one undifferentiated list.
Candidates learn defect categories in isolation and never practice triage under time pressure. On the exam, scenarios are written so that one item (a missing drain cover, a loose ladder, a broken barrier gate, an exposed live conduit) is clearly urgent while several others are routine, and candidates who do not triage pick the wrong 'most significant' answer or bury the hazard.
What to do instead
Before each question, ask 'could this injure or kill someone today?' Items that pass that test go in a separate, prominent safety section and are communicated to the client directly, not just written down. Practice sorting a sample list of 20 findings into safety, repair, and maintenance tiers until the sorting is automatic.
Inspecting the pool only and treating the spa as an accessory-skipping the spa shell, jets, air blower, spa-side controls, and the spa's own drain and suction fittings.
Many candidates have far more pool exposure than spa exposure, and spas are often covered, hot, or drained, which makes them easy to skip. The exam includes spa-specific components (air blowers, jet pumps, spa packs, ozonators, covers and cover lifts) precisely because inspectors who skip them miss the highest-risk suction fittings and the most common equipment failures.
What to do instead
Treat the spa as a second, complete inspection with its own checklist: shell and finish, jets and air controls, blower operation, spa-side control function, heater operation and setpoint, drain and suction fitting condition, cover condition and safety latch, and cover lift hardware. If the spa is drained or covered and cannot be operated, say so explicitly and describe what could not be evaluated.
Testing water chemistry by dipping a strip once and reporting 'chemistry is fine,' without recording actual readings for free chlorine, combined chlorine, pH, total alkalinity, calcium hardness, and cyanuric acid, and without noting the temperature and the time of sampling.
Candidates treat chemistry as a homeowner chore rather than an inspection finding, and they do not know which parameters matter or what the accepted ranges are. The exam tests chemistry because unbalanced water destroys finishes and equipment and because sanitizer and pH problems are the most common cause of unsafe water, and a single reading with no context cannot support a conclusion.
What to do instead
Memorize the standard ranges for each parameter and record a full panel with values, not adjectives. Note that pH and sanitine readings drift, so record the sample time and water temperature. Report out-of-range values as observations with the measured number and the accepted range, and recommend the owner verify with a professional test kit rather than asserting the water is 'safe.'
Describing the electrical components of the pool area in general terms-'there is a pump motor and a light'-without checking bonding and grounding, GFCI protection, the condition of the pump motor's wiring and conduit, the pool light's niche and lens, and the location of any junction boxes relative to the water.
Candidates without an electrical background avoid electrical topics because they fear giving incorrect advice, so they write vague statements that convey nothing. The exam includes electrical questions because electrocution and shock drowning in pools are well-documented hazards, and the most common defects (missing or broken bonding, non-GFCI protected receptacles, damaged conduit, water in a light niche) are observable without opening anything.
What to do instead
Learn the observable electrical checkpoints and report them as observations, not code interpretations: visible bonding conductor and connections at the pump, heater, and ladder, GFCI protection for pool-area receptacles and the pump circuit, condition of conduit and fittings, pool light lens and niche condition, and junction box placement. When something requires opening a panel or verifying a connection you cannot see, recommend evaluation by a licensed electrician.
Answering questions about code requirements by reciting a single national code edition as if it applied everywhere, instead of recognizing that the applicable requirement depends on the jurisdiction and the date of construction.
Candidates study one code text and assume the exam wants that number, when the exam is usually testing whether the candidate understands that requirements vary by jurisdiction and that existing pools are typically held to the code in effect when built (with some safety retrofits required). This produces confidently wrong answers on barrier height, drain cover requirements, and GFCI rules.
What to do instead
For any code-flavored question, first identify the jurisdiction and construction date implied by the scenario. Learn the concepts (why barriers have a minimum height, why anti-entrapment covers are required, why GFCI protection is required) rather than a single number, and in reports state the requirement you are applying and its source rather than asserting universal compliance.
Writing findings that describe a condition but not its implication or recommended action-'the pool deck has some cracks'-leaving the client unable to judge severity or decide what to do.
Candidates focus on demonstrating that they saw the item and run out of time or confidence to characterize it. The exam rewards findings that pair observation with significance and next step, and it penalizes conclusions that are either alarmist or empty. This is also the most common reason a real report gets challenged after a purchase.
What to do instead
Use a three-part sentence for every finding: what you observed (with location and measurement), why it matters (the mechanism or risk), and what should happen next (monitor, repair by a qualified pool contractor, evaluate by a licensed electrician). Practice rewriting vague findings into this format until it is your default.
Skipping the deck, coping, and surrounding grade-not checking for settlement, trip hazards, drainage slope away from the pool, expansion joint condition, or evidence of water pooling-and not relating deck drainage to the pool's water level and surrounding soil.
Candidates concentrate on water-containing components and treat the deck as scenery, yet deck and drainage defects are among the most common and most consequential findings because they drive shell movement, coping failure, and water intrusion. The exam tests the deck because it is where the pool interacts with the site.
What to do instead
Walk the deck as its own pass: check coping for looseness and movement, look for cracks and settled sections, verify slope drains away from the pool and away from the house, inspect expansion joints for failed sealant, and look for staining or ponding that indicates poor drainage. Report the relationship between deck drainage and the pool water level rather than listing deck items in isolation.