New Mexico CID Plumbing Inspector Examination

An inspector checking a private bathtub or combination bath/shower on a New Mexico CID plan review assigns how many drainage fixture units (DFU) from UPC 2021 Table 702.1?

• A1 DFU
• B2 DFU
• C3 DFU
• D4 DFU

During drainage sizing review, what DFU value does UPC 2021 Table 702.1 assign to a private 1.6 GPF gravity-tank water closet?

• A2 DFU
• B3 DFU
• C4 DFU
• D6 DFU

A residential clothes-washer standpipe is submitted for inspection. Per UPC 2021 Table 702.1, what are the minimum trap/trap-arm size and the DFU value?

• A1-1/2 inch trap and 2 DFU
• B2 inch trap and 2 DFU
• C2 inch trap and 3 DFU
• D3 inch trap and 4 DFU

What minimum trap and trap-arm size and DFU value does UPC 2021 Table 702.1 assign to a single-head shower?

• A1-1/2 inch and 2 DFU
• B2 inch and 2 DFU
• C2 inch and 3 DFU
• D1-1/4 inch and 1 DFU

Unless a UPC 2021 Section 708.1 exception is first approved by the authority having jurisdiction, what is the minimum uniform slope of horizontal drainage piping?

• A1/16 inch per foot
• B1/8 inch per foot
• C1/4 inch per foot
• D1/2 inch per foot

A contractor asks to flatten a 4 inch building drain to 1/8 inch per foot because the street sewer is shallow. Under UPC 2021 Section 708.1, when may the inspector accept that slope?

• AAnytime the pipe is 3 inches or larger
• BOnly if the pipe is 4 inches or larger, 1/4 inch per foot is impractical, and the AHJ fir…
• CNever; 1/4 inch per foot is mandatory on every drain
• DOnly if the drain is plastic

Per UPC 2021 Table 703.2, what is the maximum drainage fixture-unit load on a 2 inch horizontal drain (excluding the trap-arm column and water closets)?

• A4 DFU
• B6 DFU
• C8 DFU
• D16 DFU

A 3 inch horizontal waste branch is proposed to carry 32 DFU with no water closets. Using UPC 2021 Table 703.2, what should the inspector conclude?

• AReject it; a 3 inch horizontal drain is limited to 20 DFU
• BAccept it; a 3 inch horizontal drain is limited to 35 DFU
• CReject it; a 3 inch horizontal drain is limited to 16 DFU
• DAccept it only if the slope is 1/8 inch per foot

An inspector measures a 1-1/2 inch lavatory trap arm sloped at 1/4 inch per foot. Per UPC 2021 Table 1002.2, what is the maximum developed length from the trap weir to the inner edge of the vent?

• A30 inches
• B42 inches
• C60 inches
• D72 inches

Per UPC 2021 Table 1002.2 Note 2, what is the maximum developed length from the top of a water-closet flange to the inner edge of its vent?

• A42 inches
• B5 feet
• C6 feet
• D10 feet

A 2 inch shower trap arm is installed with the vent fitting only 3 inches from the trap weir. What UPC 2021 Table 1002.2 / Section 1002.2 violation should the inspector cite?

• AThe trap arm exceeds the 60 inch maximum
• BThe trap-to-vent distance is less than the 4 inch minimum and less than two pipe diameters
• CA 2 inch trap arm is not permitted for a shower
• DThe vent must connect at the trap weir

Except as otherwise provided, UPC 2021 Section 707.4 requires a cleanout at which location on horizontal drainage piping?

• AOnly at the building sewer connection
• BAt the upper terminal
• CAt every 45 degree change of direction
• DAt the base of every vent stack only

Per UPC 2021 Section 719.1, a straight run of building sewer requires cleanouts at intervals not exceeding which distance?

• A50 feet
• B75 feet
• C100 feet
• D150 feet

An inspector adds the direction changes on a horizontal waste branch and finds 45 degrees plus 90 degrees plus 45 degrees. Per UPC 2021 Section 707.4, is an additional cleanout required for change of direction?

• ANo, because no single fitting exceeds 90 degrees
• BYes, because the aggregate change of direction exceeds 135 degrees
• CNo, because cleanouts are never required for direction change
• DYes, but only if the pipe is 4 inches or larger

A drainage and vent system is water-tested in sections under UPC 2021 Section 712.2. What minimum head and hold time must the inspector require on each section?

• A5 foot head held for 10 minutes
• B10 foot head held for not less than 15 minutes
• C15 foot head held for 5 minutes
• DA 5 psi air test held for 30 minutes in place of water

Vertical drainage piping connecting to horizontal drainage piping shall enter through which fittings under UPC 2021 Section 706.4?

• AA sanitary tee rolled on its back
• BA short-sweep 1/4 bend only
• CA 45 degree wye, combination wye and 1/8 bend, or other approved fitting of equivalent sw…
• DA double-hub fitting

A restaurant pot sink is piped with a direct sanitary connection. Under NMAC 14.8.2.16 (UPC 704.3 as amended in New Mexico), what must the inspector require?

• AAccept the direct connection if a grease interceptor is installed
• BRequire the sink to drain by indirect waste through an air gap into an open floor sink or…
• CRequire a 4 inch trap and a circuit vent
• DAllow a direct connection if a food-waste disposer is also on the sink

A private dwelling drainage plan shows one 1.6 GPF gravity-tank water closet, one lavatory, one bathtub, one kitchen sink, and one clothes-washer standpipe. Using UPC 2021 Table 702.1, what total DFU should the inspector use to size the building drain?

• A8 DFU
• B11 DFU
• C14 DFU
• D16 DFU

A 4 inch horizontal building drain is approved at 1/8 inch per foot slope. Per UPC 2021 Table 703.2 Note 5, what is the maximum DFU load the inspector should allow?

• A160 DFU
• B173 DFU
• C216 DFU
• D256 DFU

A battery of floor-outlet water closets is proposed on a circuit vent. Per UPC 2021 Section 911.1 and 911.2, which statement is correct?

• AA maximum of eight floor-outlet water closets, showers, bathtubs, or floor drains may be…
• BAny number of fixtures may be circuit-vented if the vent is 1-1/2 inches
• CCircuit vents are limited to lavatories only
• DA circuit vent may receive the discharge of a soil or waste

Unless a New Mexico air-admittance exception is approved, UPC 2021 Section 906.1 requires each vent pipe terminating through the roof to extend how far above the roof?

• A2 inches
• B6 inches
• C12 inches
• D24 inches

A vent terminal is 8 feet horizontally from an operable window. Per UPC 2021 Section 906.2, what must the inspector require?

• AAccept it; 8 feet exceeds the 6 foot opening-clearance rule
• BRequire the terminal to be at least 10 feet from the opening or at least 3 feet above the…
• CRequire the terminal to be 5 feet above the roof only
• DAllow it if an AAV is installed in the attic

A contractor wants to vent a lavatory with an air-admittance valve instead of a roof terminal. Under NMAC 14.8.2.19 (UPC 906.1 as amended), when may the inspector accept an AAV?

• AAnytime the installer prefers an AAV
• BOnly when approved by the AHJ and conventional venting termination methods are not availa…
• CNever; New Mexico prohibits AAVs
• DOnly on water closets

Per UPC 2021 Table 703.2 Note 6, an individual vent shall be not less than 1-1/4 inches and not less than which fraction of the drain it serves?

• AOne-third the drain diameter
• BOne-half the drain diameter
• CTwo-thirds the drain diameter
• DThe full drain diameter

What is the smallest individual vent diameter permitted by UPC 2021 Table 703.2 Note 6?

• A1 inch
• B1-1/4 inches
• C1-1/2 inches
• D2 inches

A 2 inch horizontal waste runs 40 feet at the UPC 708.1 minimum slope of 1/4 inch per foot. How much fall must the inspector see between the upstream and downstream ends?

• A5 inches
• B8 inches
• C10 inches
• D20 inches

Suds-producing fixtures discharge to a stack that turns from vertical to horizontal. Per UPC 2021 Section 711.1, drainage connections shall not be made into that drainage piping within what distance of the vertical-to-horizontal change?

• A2 feet
• B5 feet
• C8 feet
• D10 feet

A water service static pressure is 92 psi at the meter. Per UPC 2021 Section 608.2, what must the inspector require?

• ANo action; any pressure under 100 psi is acceptable
• BAn approved pressure regulator preceded by a strainer
• CA reduced-pressure principle backflow assembly on every fixture
• DA larger meter only

Per UPC 2021 Table 610.3, what water-supply fixture-unit (WSFU) value and minimum fixture-branch size apply to a private lavatory when sizing the cold-water building supply?

• A0.5 WSFU on a 3/8 inch branch
• B1.0 WSFU on a 1/2 inch branch
• C2.0 WSFU on a 1/2 inch branch
• D4.0 WSFU on a 1/2 inch branch

What WSFU value does UPC 2021 Table 610.3 assign to a private bathtub or combination bath/shower (fill) on the cold-water building supply?

• A1.0 WSFU
• B2.0 WSFU
• C4.0 WSFU
• D10.0 WSFU

A private 1.6 GPF gravity-tank water closet is being added to a water-supply calculation. Per UPC 2021 Table 610.3, what WSFU value should the inspector use?

• A1.0 WSFU
• B2.5 WSFU
• C3.5 WSFU
• D5.0 WSFU

A dwelling has two hose bibbs on the building supply. Per UPC 2021 Table 610.3 and Note 8, what total WSFU should be used for building-demand sizing?

• A2.5 WSFU
• B3.5 WSFU
• C5.0 WSFU
• D4.0 WSFU

When separately sizing the hot-water branch to a private lavatory, UPC 2021 Table 610.3 Note 3 permits the inspector to use which WSFU value?

• A1.0 WSFU
• B0.75 WSFU
• C0.50 WSFU
• D1.5 WSFU

Quick-closing valves are installed on a clothes washer and dishwashers. Per UPC 2021 Section 609.10, what device must the inspector require?

• AA pressure-reducing valve at the water heater only
• BApproved water-hammer arrestors conforming to the applicable standard
• CAn extra hose bibb on the laundry wall
• DA dual-check valve at the meter

A water-service pipe and a building sewer are laid in the same trench. Which installation should the inspector accept under typical UPC 2021 Section 609.2 underground-separation rules?

• AWater and sewer in the same plane, 6 inches apart
• BWater at least 12 inches horizontally from the sewer, or crossing above the sewer with at…
• CWater under the sewer with no clearance
• DNo separation is required if both pipes are plastic

The first 1.6 GPF flushometer-valve water closet on a public battery is being assigned WSFU under UPC 2021 Section 610.10 / Table 610.10. What fixture-unit value should the inspector use for that first valve?

• A10 WSFU
• B15 WSFU
• C40 WSFU
• D2.5 WSFU

A public restroom has three 1.6 GPF flushometer-valve water closets on one supply. Using UPC 2021 Table 610.10, what total WSFU should the inspector assign to those three closets?

• A7.5 WSFU
• B30 WSFU
• C90 WSFU
• D120 WSFU

Per UPC 2021 Table 610.3, a private domestic kitchen sink with or without a dishwasher is assigned which building-supply WSFU and minimum branch size?

• A1.0 WSFU on a 1/2 inch branch
• B1.5 WSFU on a 1/2 inch branch
• C2.0 WSFU on a 3/4 inch branch
• D4.0 WSFU on a 1/2 inch branch

What WSFU and minimum fixture-branch size does UPC 2021 Table 610.3 assign to a private clothes washer?

• A2.0 WSFU on a 1/2 inch branch
• B3.0 WSFU on a 3/4 inch branch
• C4.0 WSFU on a 1/2 inch branch
• D4.0 WSFU on a 3/4 inch branch

A one-bath dwelling water calculation includes one bathtub (fill), one lavatory, one 1.6 GPF gravity-tank water closet, one kitchen sink, one clothes washer, and one hose bibb. Using UPC 2021 Table 610.3 private values, what is the building-supply WSFU total?

• A11.5 WSFU
• B15.5 WSFU
• C18.0 WSFU
• D23.0 WSFU

Which backflow method in UPC 2021 Table 603.2 provides high-hazard protection against backsiphonage by a physical unobstructed vertical separation?

• AA dual-check valve (ASSE 1024)
• BAn atmospheric vacuum breaker
• CAn air gap complying with ASME A112.1.2
• DA double check valve assembly

A high-hazard cross-connection can create backpressure. Per UPC 2021 Table 603.2, which assembly may the inspector accept?

• AAn atmospheric vacuum breaker
• BA pressure vacuum breaker
• CA reduced-pressure principle backflow prevention assembly
• DA hose-connection vacuum breaker

A double check valve assembly is proposed on a high-hazard chemical feed. What should the New Mexico plumbing inspector do under UPC 2021 Table 603.2?

• AAccept it because a DCVA protects against backpressure
• BReject it; a DCVA is limited to low-hazard (pollution) applications
• CAccept it if it is 12 inches above the flood-level rim
• DAccept it if it is installed in a pit

A pressure vacuum breaker is installed 8 inches above the highest downstream outlet of a lawn-sprinkler system with no pumps or chemical injection. Per UPC 2021 Table 603.2, what is the inspector’s call?

• AAccept it; 6 inches is enough for a PVB
• BReject it; a PVB shall be at least 12 inches above all downstream piping and the flood-le…
• CReject it because a PVB can never serve irrigation
• DAccept it only if a valve is installed immediately downstream

An atmospheric vacuum breaker is installed under continuous pressure with a shutoff valve downstream of the AVB. What UPC 2021 Table 603.2 / Section 603.5 violation should the inspector cite?

• ANone; AVBs are designed for continuous pressure
• BAn AVB shall not be subjected to continuous pressure and shall not have valves downstream
• CThe AVB must be 12 inches above the outlet
• DAn AVB is only legal on fire sprinklers

A potable outlet supplies a tank. The effective opening is 1/2 inch and the outlet is not affected by nearby walls. Per UPC 2021 Table 603.3.1, what is the minimum air-gap height the inspector should measure?

• A1/2 inch
• B1 inch
• C1-1/2 inches
• D2 inches

A carbonated-beverage dispenser is connected to the potable water supply with an ASSE 1024 dual check. What should the inspector require under UPC 2021 Section 603.5.12?

• AAccept the dual check because beverage equipment is low hazard
• BRequire a listed ASSE 1022 backflow preventer (or the Table 603.2 beverage protection) be…
• CRequire only an atmospheric vacuum breaker
• DRequire a DCVA in a pit