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100+ Free NM CID MM-1 Practice Questions

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2026 Statistics

Key Facts: NM CID MM-1 Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

100 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

250 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 68.88

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID MM-1 is a 100-question PSI plumbing contractor exam, 75% pass, 250 minutes, USD 68.88 (bulletin 4/3/2026).

Sample NM CID MM-1 Practice Questions

Try these sample questions to test your NM CID MM-1 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under UPC 2021 Table 702.1, what drainage fixture unit (DFU) value is assigned to a private 1.6 gpf gravity-tank water closet?
A.3 DFU
B.2 DFU
C.4 DFU
D.6 DFU
Explanation: Table 702.1 rates a private 1.6 gpf gravity-tank water closet at 3.0 DFU with a 3-inch minimum trap. The public column is 4.0 DFU and the assembly column is 6.0 DFU. Water closets are computed as 6 DFU only when sizing a septic tank under Appendix H, not when sizing the building drain.
2What is the UPC 2021 Table 702.1 private DFU value and minimum trap size for a lavatory?
A.2.0 DFU on a 1-1/2 inch trap
B.1.0 DFU on a 1-1/4 inch trap
C.1.0 DFU on a 2 inch trap
D.3.0 DFU on a 1-1/4 inch trap
Explanation: Table 702.1 lists a lavatory at 1.0 DFU private, public, and assembly, with a 1-1/4 inch minimum trap and trap arm. Table 702.1(1) also limits a 1-1/4 inch trap to 1 DFU. Lavatories in sets use a 1-1/2 inch trap and 2.0 DFU.
3A private bathtub or combination bath/shower is assigned how many DFU in UPC 2021 Table 702.1?
A.1.0 DFU
B.3.0 DFU
C.2.0 DFU
D.4.0 DFU
Explanation: Table 702.1 rates a bathtub or combination bath/shower at 2.0 DFU private and public, with a 1-1/2 inch minimum trap. Do not confuse that drainage load with the 4.0 WSFU assigned to a bathtub fill in Table 610.3.
4What DFU value and minimum trap size does UPC 2021 Table 702.1 assign to a domestic clothes-washer standpipe?
A.2.0 DFU on a 1-1/2 inch trap
B.4.0 DFU on a 2 inch trap
C.3.0 DFU on a 1-1/2 inch trap
D.3.0 DFU on a 2 inch trap
Explanation: Table 702.1 lists a domestic clothes-washer standpipe at 3.0 DFU private, public, and assembly, with a 2 inch minimum trap. Note 5 raises a battery of three or more washers to 6 DFU each when sizing the common horizontal and vertical drainage piping.
5A private bathroom group consists of one 1.6 gpf tank water closet, one lavatory, and one bathtub. Using UPC 2021 Table 702.1, what is the total DFU load of the group?
A.6 DFU
B.5 DFU
C.7 DFU
D.8 DFU
Explanation: Add the table values: private 1.6 gpf water closet 3.0 + lavatory 1.0 + bathtub 2.0 = 6.0 DFU. UPC does not substitute a reduced bathroom-group DFU the way some IPC tables do, so size from the individual fixture ratings.
6A dwelling has two private 1.6 gpf tank water closets, two lavatories, one bathtub, one single-head shower, one domestic kitchen sink, and one clothes-washer standpipe. What is the total Table 702.1 DFU load?
A.15 DFU
B.17 DFU
C.19 DFU
D.21 DFU
Explanation: Water closets 3 + 3 = 6, lavatories 1 + 1 = 2, bathtub 2, shower 2, kitchen sink 2, clothes-washer standpipe 3. Total 6 + 2 + 2 + 2 + 2 + 3 = 17 DFU. The kitchen sink still counts 2 DFU even though Note 2 requires a 2 inch minimum drain.
7Per UPC 2021 Table 703.2, what is the maximum DFU load permitted on a 3 inch horizontal drain, building drain, or building sewer at 1/4 inch per foot slope?
A.48 DFU
B.8 DFU
C.35 DFU
D.216 DFU
Explanation: Table 703.2 allows 35 DFU on a 3 inch horizontal drain and 48 DFU on a 3 inch vertical drain. Note 4 also limits any 3 inch drain to not more than five water closets or five six-unit traps. A 4 inch horizontal drain jumps to 216 DFU at 1/4 inch per foot.
8A 3 inch horizontal branch at 1/4 inch per foot will serve public 1.6 gpf water closets only. What is the maximum number of those water closets permitted on the branch?
A.Six
B.Eight
C.Three
D.Five
Explanation: Five public 1.6 gpf water closets equal 5 × 4 = 20 DFU, which is under the 35 DFU horizontal limit. Table 703.2 Note 4 still caps a 3 inch drain at five water closets, so a sixth closet is prohibited even though 24 DFU would still be under 35. Six public closets also push the designer toward a 4 inch branch.
9What is the default minimum slope of horizontal drainage piping under UPC 2021 Section 708.1?
A.1/4 inch per foot (2 percent)
B.1/8 inch per foot (1 percent)
C.1/2 inch per foot (4 percent)
D.1 inch per foot
Explanation: Section 708.1 requires a uniform slope of not less than 1/4 inch per foot, or 2 percent, toward the point of disposal. Piping 4 inches and larger may be reduced to 1/8 inch per foot only where 1/4 inch is impractical and the Authority Having Jurisdiction first approves the flatter grade.
10A 3 inch horizontal waste runs 40 feet at the UPC 708.1 minimum slope of 1/4 inch per foot. What is the required fall from upstream invert to downstream invert?
A.5 inches
B.10 inches
C.20 inches
D.3-1/3 inches
Explanation: Fall equals length times slope: 40 ft × 1/4 in/ft = 10 inches. A 3 inch drain is not eligible for the 1/8 inch per foot exception, which applies only to 4 inch and larger pipe after AHJ approval.

About the NM CID MM-1 Exam

The New Mexico CID MM-1 examination is the contractor plumbing trade exam. The official open-book PSI exam has 100 scored questions, a 75% passing standard (75 points), and 250 minutes allowed. Allowed references include UMC 2021, NMAC 14.8.2 (2015), UPC 2021, IPT's Pipe Trades Handbook (2016), NMAC 14.9.2 (2015), NMAC 20.7.3 (2005), and NFPA 30A (2015 or earlier). Mathematics for Plumbers and Pipefitters and OSHA 29 CFR 1926 are listed as not allowed in the exam center. NMAC 14.6.6 MM-1 requires four years of experience and covers plumbing, fixtures, piping, hot-water heating not exceeding 30 psi or 400,000 Btu/h input, fuel-oil and gasoline piping, solar thermal piping, potable-water irrigation, swimming pools and spas, septic tanks and sewers, and controls not greater than 24 volts. It does not include natural-gas appliances or natural-gas piping. This English-language MCQ bank is a study aid for the contractor MM-1 exam, not the journeyman plumber (JP) exam and not an official PSI form. PSI lists the fee at USD 68.88 (bulletin updated 4/3/2026).

Questions

100 scored questions

Time Limit

250 minutes

Passing Score

75% (75 of 100 points)

Exam Fee

USD 68.88 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID MM-1 Exam Content Outline

25%

Drainage Waste and Vents

Drainage waste and vents (25 items)

10%

Water Supply Systems

Water supply systems (10 items)

9%

Backflow Prevention

Backflow prevention (9 items)

6%

Storm Drainage Systems

Storm drainage systems (6 items)

10%

Plumbing Fixtures including Water Heaters and Accessibility

Plumbing fixtures including water heaters and accessibility (10 items)

15%

General Knowledge and General Regulations

General knowledge and general regulations (15 items)

9%

Interceptors and Traps

Interceptors and traps (9 items)

10%

Isometric Analysis

Isometric analysis (10 items)

6%

Septic and Sewer

Septic and sewer (6 items)

How to Pass the NM CID MM-1 Exam

What You Need to Know

  • Passing score: 75% (75 of 100 points)
  • Exam length: 100 questions
  • Time limit: 250 minutes
  • Exam fee: USD 68.88

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NM CID MM-1 Study Tips from Top Performers

1Drainage, waste, and vents are 25 of 100 official items. Study UPC 2021 with NMAC 14.8.2 (2015).
2This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the NM MM-1 exam?

The official PSI examination has 100 scored questions. Passing is 75% (75 points) within 250 minutes (bulletin updated 4/3/2026).