ASSE 6040 common mistakes
ASSE 6040 · Understand the traps and how to avoid them.
Confusing backflow prevention assemblies with backflow prevention devices when classifying a listed component (e.g., calling an atmospheric vacuum breaker an assembly, or a reduced pressure principle assembly a device).
The terms sound interchangeable in everyday speech, and candidates memorize product names without anchoring the definitional distinction: an assembly consists of two or more independently acting check valves with test cocks, while a device relies on a single moving element or an air gap.
What to do instead
Build a two-column comparison table from the definitions and sort every listed product (RP, DC, PVB, SVB, AVB, air gap, dual check, hose bibb vacuum breaker) into the correct column. For each, write one sentence naming the number of check valves and whether test cocks are required. Recite the table until you can classify any product in under five seconds.
Treating all cross-connections as equally hazardous and recommending the same protection regardless of the degree of hazard (e.g., specifying an RP assembly for a low-hazard irrigation connection or a dual check for a high-hazard chemical injection line).
Candidates memorize a single 'best' device and apply it everywhere, skipping the pollutant-versus-contaminant distinction and the health-risk logic that drives device selection in codes and standards.
What to do instead
Practice a three-step hazard triage for each scenario: identify the substance, classify it as pollutant or contaminant, then match the minimum device permitted by the applicable code. Write out the reasoning chain for ten mixed scenarios (e.g., boiler feed, carbonator, lawn irrigation, laboratory sink) and compare against the code tables until the logic becomes automatic.
Misidentifying the correct test procedure sequence for a reduced pressure principle assembly, such as testing the relief valve before the check valves or omitting the differential pressure check across the first check.
The procedure has a fixed order and several gauge-hose placements that look similar on paper; candidates memorize the steps as a list without understanding what each step proves about the assembly's internal condition.
What to do instead
Learn the procedure as a diagnostic story: each step isolates one component and one failure mode. Draw the assembly with hose connections labeled for each step, then explain aloud what a failure at that step indicates (e.g., a leaking first check, a fouled relief valve seat). Practice with a test kit on a training assembly until the sequence is procedural memory.
Assuming a device that passed its annual test is therefore installed in compliance, ignoring installation requirements such as minimum elevation above grade, protection from freezing, and no bypass or shutoff valve downstream.
Candidates conflate testing with inspection and focus on the gauge readings, forgetting that a correctly functioning assembly can still be a code violation because of where and how it is installed.
What to do instead
Create an installation checklist for each assembly type covering elevation, drainage, freeze protection, accessibility, and downstream restrictions. During field practice, inspect the installation first and test second, documenting each checklist item. Review the manufacturer's installation manual and the applicable code section side by side.
Citing a general plumbing code requirement when the question asks for the specific standard or regulation that governs a particular activity, such as tester certification or annual testing frequency.
Codes, standards, and regulations overlap in scope, and candidates memorize content without tagging each fact to its source document and jurisdiction level.
What to do instead
Build a source map with three columns: federal, state or local regulation, and consensus standard. Place each key requirement (certification, test frequency, device approval, reporting) in the correct column with the document name and section. Quiz yourself by covering the source column and naming the governing document for each requirement.
Designing a cross-connection control program that addresses only testing and omits the other required elements, such as hazard assessment, device inventory, tester certification, enforcement, and public education.
Candidates reduce program administration to the most visible activity (annual testing) and underestimate the ordinance, recordkeeping, and enforcement infrastructure that makes testing meaningful.
What to do instead
Memorize a program framework of six to eight core elements and write a one-paragraph description of each, including the documents and procedures it requires. Then take a sample ordinance and map each element to a section, noting gaps. Practice answering scenario questions by naming the missing element rather than describing testing.
Confusing containment (premises isolation) with internal protection when deciding where a device should be installed in a described facility.
Both strategies use the same devices, so candidates focus on the device type and overlook the location and purpose distinction: containment protects the public main at the service entrance, while internal protection isolates a specific fixture or system.
What to do instead
For ten facility descriptions, draw the water service and mark two locations: the service entrance and each internal hazard point. Label which device belongs at each and state the protected population. Repeat until you can state in one sentence why a facility might need both containment and internal protection.
Recording test results and submitting reports without verifying that all required data fields are present, legible, and consistent with the device inventory, leading to rejected or untraceable reports.
Candidates treat reporting as a clerical afterthought and do not know the data elements that make a test report defensible, such as device make, model, size, serial number, location, test gauge calibration, and tester certification number.
What to do instead
Obtain a blank test report form and annotate every field with why it is required and what error it prevents. Practice completing reports from field notes, then audit your own reports against a checklist. Learn the retention and submission timelines for your jurisdiction and include them in the checklist.
Answering questions about the public health significance of cross-connections with general statements about contamination instead of naming specific biological and chemical agents and the diseases or effects they cause.
The material is often studied as background reading rather than as testable content, so candidates retain a vague sense of danger without the specific examples exam questions use.
What to do instead
Build a flashcard set pairing each agent or class (e.g., E. coli, Salmonella, hepatitis A, Giardia, Legionella, pesticides, industrial chemicals) with its source, route of entry, and health effect. Include at least one documented outbreak scenario per category and practice explaining the chain from cross-connection to illness in three sentences.
Evaluating program performance only by counting tests performed, rather than using outcome measures such as device inventory accuracy, compliance rate, hazard coverage, and repeat failure rates.
Candidates equate activity with effectiveness and are unfamiliar with the evaluation metrics used in program administration, so they choose the most obvious number instead of a meaningful indicator.
What to do instead
Learn a small set of program evaluation metrics and what each reveals: percent of inventory tested on time, percent of high-hazard premises protected, repeat failure rate by device type, and report rejection rate. For each, write one sentence on the management action it should trigger. Practice interpreting a sample annual report and recommending two improvements based on the data.