Idaho Plumbing Specialty Water Pump Journeyman Exam
Idaho
· PSI Services Contractor
Verified, not estimated. Every figure below is drawn from the official exam structure we maintain — question counts, passing standard and topic weighting. Practice questions are grounded in the source law with statute citations. We omit any figure we can't verify rather than guess at it.
Total questions
50
Passing score
75%
Exam time
150 min
Administered by
PSI Services Contractor
Format
Reference materials allowed
Idaho State Portion
50 questions
2017 Idaho State Plumbing Code Chapter 111 Q · 22%
Scope, purpose, and applicability of the codeAuthority Having Jurisdiction — duties, powers, and liabilityPermit requirements and exempt workPermit application and construction document submissionPermit issuance, validity, expiration, and revocationInspections — types, scheduling, and reinspection proceduresSystem testing and approval requirementsViolations, penalties, stop orders, and Board of Appeals
2017 Idaho State Plumbing Code Chapter 26 Q · 12%
Potable water supply and distribution terminology (building supply, water distribution pipe, water main, riser, fixture branch, fixture supply)Backflow and cross-connection terminology (backflow, backsiphonage, backpressure backflow, cross-connection, backflow preventer, critical level, air gap)Drainage system terminology (building drain, building sewer, soil pipe, waste pipe, horizontal branch, stack, building subdrain, invert, grade)Venting system terminology (plumbing vent, dry vent, wet vent, vent stack, stack vent, branch vent, individual vent, relief vent, yoke vent, trap primer)Trap and fixture terminology (trap, trap seal, trap arm, tailpiece, fixture unit, fixture drain, plumbing fixture, bathroom group)Pipe joining and materials terminology (joint types—brazed, soldered, welded, flanged, flared, compression; pipe material abbreviations—ABS, CPVC, PVC, PEX, PE, PP; SDR)Nonpotable and alternate water source terminology (gray water, reclaimed water, rainwater catchment system, on-site treated nonpotable water, gray water diverter valve, mulch basin)Authority, approval, and code applicability terminology (Authority Having Jurisdiction, approved, listed, labeled, listing agency, accepted engineering practice, shall/should/may)
2017 Idaho State Plumbing Code Chapter 321 Q · 42%
Minimum standards for pipe, fittings, and materials (listing, labeling, and marking requirements)Alternate materials and methods of construction equivalency (AHJ approval and testing)Protection of piping from corrosion, freezing, mechanical damage, and UV exposurePipe hangers, supports, and hanger rod sizing (Table 313.3 and Table 313.6 intervals by material)Prohibited fittings and installation practices (drainage, vent, and waste connections)Trenching, excavation, backfill, and thermoplastic pipe bedding requirementsTest gauge requirements and pressure graduation specificationsAlternative engineered design requirements (permit application, design documents, and AHJ approval)
2017 Idaho State Plumbing Code Chapter 612 Q · 24%
Backflow prevention devices and assemblies (air gap, AVB, PVB, SVB, DC, RP) — types, components, and applicable hazard levelsCross-connection control requirements and prohibited connectionsWater supply piping materials, lead content limits, and applicable standards (copper types, PEX, CPVC, PE, PP, PVC, stainless steel)Pipe joining methods by material type (soldered, brazed, flared, mechanical, solvent cement, heat-fusion, push-fit)Water system sizing using fixture units, Table 610.3, and Table 610.4 (pressure ranges, developed length, meter and branch sizing)Water pressure requirements, pressure regulators, expansion tanks, and relief valve discharge pipingValve requirements (fullway shutoff, control valves, multidwelling unit shutoffs) and potable water supply tank requirementsResidential fire sprinkler system installation, piping materials, sizing calculations, and inspection requirements
Key Distinctions
Brazed JointvsSoldered Joint
A brazed joint uses alloys that melt above 840°F (449°C) but below the melting point of the parts joined, while a soldered joint uses alloys that melt at or below 840°F (449°C).
2017 ISPC, Section 212.0 - Joint, Brazed
AccessiblevsReadily Accessible
'Accessible' may require removal of an access panel or door to reach, while 'Readily Accessible' means direct access with no obstruction to remove.
Pollution impairs potable water aesthetically but does not create a public health hazard (Low Hazard), whereas contamination implies a condition creating an actual hazard to public health.
2017 ISPC Section 218.0 (Pollution)
Confined SpacevsUnconfined Space
A confined space has a volume less than 50 cubic feet per 1,000 Btu/h of aggregate appliance input rating; an unconfined space meets or exceeds that volume threshold.
2017 ISPC Section 205.0 (Confined Space definition)
Underground InspectionvsRough-In Inspection
The underground inspection covers below-grade drainage work before burial, while the rough-in inspection occurs after piping is installed but before wall or ceiling membranes are closed.
2017 ISPC, Section 105.2
Pressure Test ≤10 psi (Gauge Requirement)vsPressure Test >10 psi and ≤100 psi (Gauge Requirement)
Tests at 10 psi or less require gauges with 0.10 psi incrementation or less, while tests above 10 psi up to 100 psi require gauges with 1 psi incrementation or less.
2017 ISPC Section 318.2
Building DrainvsBuilding Sewer
The building drain is the lowest interior drainage piping up to 2 feet outside the building wall, where the building sewer begins.
2017 ISPC, Section 204.0 - Building Drain
Horizontal PipevsVertical Pipe
A horizontal pipe is installed horizontally or at less than 45 degrees from horizontal, while a vertical pipe makes a 45-degree or greater angle with the horizontal.
2017 ISPC, Section 210.0 - Horizontal Pipe
Board of Appeals (Voting Rights)vsAuthority Having Jurisdiction on Board of Appeals
Board of Appeals members have voting rights on matters before the board, while the AHJ serves as an ex-officio, non-voting secretary to the board.
2017 ISPC Section 107.1
Appendices (ISPC)vsCode Body (ISPC)
Appendices supplement the code but are NOT considered part of the code unless formally adopted, whereas the code body applies automatically upon adoption.
2017 ISPC Section 102.8
Gravity Grease InterceptorvsStandard Fixture Trap
A gravity grease interceptor requires a minimum total volume of 300 gallons, at least two compartments, baffles, and 30-minute retention time, while a standard fixture trap has no such volume or compartment requirements.
Per 2017 ISPC Section 211.0, an insanitary condition includes a trap that does not maintain a proper seal or whose seal is not protected against siphonage and backpressure by a vent pipe.
Board of Appeals Powers Limitation 2017 ISPC Section 107.2
Per 2017 ISPC Section 107.2, the Board of Appeals is NOT empowered to waive any requirements of the code.
Notice of Correction Compliance Period 2017 ISPC Section 106.2
Per 2017 ISPC Section 106.2, refusal, failure, or neglect to comply with a notice of correction within 10 days of receipt is considered a violation of the code.
Per 2017 ISPC Section 104.5.2, when work is commenced without a permit, an investigation fee equal to the permit fee is collected in addition to the permit fee, whether or not a permit is subsequently issued.
Bathroom Group 2017 ISPC Section 204.0 (Bathroom Group definition)
Per 2017 ISPC Section 204.0, a bathroom group is a combination of fixtures not exceeding one water closet, two lavatories, one bathtub or combination bath/shower, one shower, and may include a bidet and emergency floor drain.
Hot Water 2017 ISPC, Section 210.0 - Hot Water
Per 2017 ISPC Section 210.0, hot water is water at a temperature of 120°F (49°C) or higher.
Confined Space (Plumbing Code) 2017 ISPC Section 205.0 (Confined Space definition)
Per 2017 ISPC Section 205.0, a confined space is a room or space with a volume less than 50 cubic feet per 1,000 Btu/h of the aggregate input rating of all fuel-burning appliances installed in that space.
Per 2017 ISPC Section 209.0, a gravity grease interceptor is identified by gravity separation, baffles, not less than two compartments, 30-minute retention time, and a total volume of not less than 300 gallons (1,135 L).
