NEW HAMPSHIRE | INDEPENDENT EXAM PREP
SEPTIC INSTALLER
EXAM 3
SYSTEM INSTALLATION & CONSTRUCTION
SEPTIC TANK D-BOX
DISPOSAL AREA
PLAN READING / TANKS / GRAVITY PIPES / EDAs / INSPECTIONS
100 10 2026/27
ORIGINAL MCQs FOCUSED MODULES STUDY EDITION
Correct answers | Detailed rationales | NH regulatory references
Not affiliated with NHDES. Not an official exam or a pass guarantee.
,NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
EXAM OVERVIEW
System Installation & Construction | Exam 3 | 100 original multiple-choice questions, four choices
each.
Edition: 2026/2027 Rule check: October 14, 2026 Jurisdiction: New Hampshire
This original educational practice exam tests construction decisions informed by New Hampshire RSA 485-A and
Env-Wq 1000, as adopted effective February 1, 2026. There is no publicly verified official "Exam 3" blueprint for
this document. Question counts and study-time guidance here are editorial, not representations of the actual
NHDES assessment.
HOW TO USE THIS PRACTICE EXAM
• Allow approximately 120 minutes as an optional self-practice target; this is not an official time limit.
• Choose the best answer (A, B, C or D) for each question. Each item is worth one point.
• Attempt all 100 questions before turning to the answer key and the explanations.
• Use the short rule citation beneath each rationale to verify any requirement against the state's authoritative
rules.
• Construction projects must follow their approved plans, permits, site conditions, and any subsequently effective
rules.
CONTENT MAP
QUESTIONS TOPIC
01-10 Permits, plans and installation accountability
11-20 Layout, benchmarks and basic calculations
21-30 Building sewers, gravity lines and connections
31-40 Septic tanks, compartments and access
41-50 Distribution boxes and effluent conduits
51-60 EDA excavation, stone and protection
61-70 Trenches, chambers and raised EDAs
71-80 Pumps, dosing and pressure distribution
81-90 Inspection readiness, documentation and corrective action
91-100 Integrated field scenarios and construction judgment
Scoring guide (suggested for self-review): 90-100 strong recall; 75-89 review errors; below 75 revisit the corresponding rule
topics. These ranges are not official NHDES passing standards.
Independent practice questions | October 2026 rule review 2
,NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
PART I | PRACTICE QUESTIONS
Select one best response for each question. Answers and explanations begin after Question 100.
SECTION 01 / QUESTIONS 1-10
Permits, plans and installation accountability
001. A contractor has a construction approval but intends to install a septic system in a different
location than the approved plan. What should be done first?
A. Resolve the change through the required amended-plan and approval process before proceeding.
B. Install the system where excavation is easiest and record the change at closeout.
C. Ask the equipment operator to approve the new layout.
D. Rely on a verbal field waiver from a neighbor.
002. Who bears responsibility for installation work performed under a New Hampshire installer
permit number?
A. Only the excavation subcontractor.
B. The permitted installer whose number is used.
C. The tank manufacturer, regardless of field work.
D. The eventual homeowner in every case.
003. During construction, where must a New Hampshire ISDS construction approval be posted?
A. Inside the installer's locked vehicle only.
B. At the distributor's office.
C. At a site location readily visible from a public way.
D. Only inside the completed dwelling.
004. What is the primary document controlling septic-system elevations and component locations
during construction?
A. An informal sketch made after excavation.
B. A sales brochure for the septic tank.
C. The NHDES-approved construction plan.
D. The machine operator's preferred grade.
005. Before requesting ordinary final inspection, which installation milestone should normally be
met?
A. Only the septic tank has been delivered.
B. The complete ISDS and applicable building foundation or slab are in place as shown on the approved plan.
C. The EDA has been covered and landscaped, without inspection.
D. A temporary pipe has been connected to a pump truck.
Independent practice questions | October 2026 rule review 3
, NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
006. When site constraints restrict access, what partial-inspection option exists under the
February 2026 rules?
A. Unlimited partial inspections are automatic.
B. Any incomplete excavation may be covered without notice.
C. A partial inspection is a substitute for eventual system approval.
D. One partial inspection per site may be requested for a completed ISDS component when the stated conditions
apply.
007. A contractor says NHDES inspection replaces the installer's construction quality-control
checks. Which response is correct?
A. Correct; field quality checks cease once inspection is scheduled.
B. Correct if the system has two tanks.
C. NHDES inspection does not replace ongoing good construction oversight.
D. Correct only when a contractor has insurance.
008. Can an installer use a verbal field waiver to ignore an incorrect location on an approved plan?
A. Yes, if the trench is less than 60 inches wide.
B. Yes, whenever the inspector is busy.
C. No; the rules prohibit field waivers.
D. Yes, if the tank is larger than required.
009. What does RSA 485-A:36 generally require of a person commercially installing septic
systems?
A. Only a commercial driver license.
B. An installer permit, subject to statutory exemptions.
C. A permit only for systems with pumps.
D. No credential if a backhoe is used.
010. A homeowner building their own future domicile claims the permit exemption allows any
unverified installation. What is the best response?
A. The homeowner can ignore the state-approved plan.
B. The installer permit exemption also waives inspections.
C. The exemption has statutory conditions, including approved design compliance and required certification and
affidavit.
D. Any relative may certify the system without credentials.
SECTION 02 / QUESTIONS 11-20
Layout, benchmarks and basic calculations
Independent practice questions | October 2026 rule review 4
SEPTIC INSTALLER
EXAM 3
SYSTEM INSTALLATION & CONSTRUCTION
SEPTIC TANK D-BOX
DISPOSAL AREA
PLAN READING / TANKS / GRAVITY PIPES / EDAs / INSPECTIONS
100 10 2026/27
ORIGINAL MCQs FOCUSED MODULES STUDY EDITION
Correct answers | Detailed rationales | NH regulatory references
Not affiliated with NHDES. Not an official exam or a pass guarantee.
,NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
EXAM OVERVIEW
System Installation & Construction | Exam 3 | 100 original multiple-choice questions, four choices
each.
Edition: 2026/2027 Rule check: October 14, 2026 Jurisdiction: New Hampshire
This original educational practice exam tests construction decisions informed by New Hampshire RSA 485-A and
Env-Wq 1000, as adopted effective February 1, 2026. There is no publicly verified official "Exam 3" blueprint for
this document. Question counts and study-time guidance here are editorial, not representations of the actual
NHDES assessment.
HOW TO USE THIS PRACTICE EXAM
• Allow approximately 120 minutes as an optional self-practice target; this is not an official time limit.
• Choose the best answer (A, B, C or D) for each question. Each item is worth one point.
• Attempt all 100 questions before turning to the answer key and the explanations.
• Use the short rule citation beneath each rationale to verify any requirement against the state's authoritative
rules.
• Construction projects must follow their approved plans, permits, site conditions, and any subsequently effective
rules.
CONTENT MAP
QUESTIONS TOPIC
01-10 Permits, plans and installation accountability
11-20 Layout, benchmarks and basic calculations
21-30 Building sewers, gravity lines and connections
31-40 Septic tanks, compartments and access
41-50 Distribution boxes and effluent conduits
51-60 EDA excavation, stone and protection
61-70 Trenches, chambers and raised EDAs
71-80 Pumps, dosing and pressure distribution
81-90 Inspection readiness, documentation and corrective action
91-100 Integrated field scenarios and construction judgment
Scoring guide (suggested for self-review): 90-100 strong recall; 75-89 review errors; below 75 revisit the corresponding rule
topics. These ranges are not official NHDES passing standards.
Independent practice questions | October 2026 rule review 2
,NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
PART I | PRACTICE QUESTIONS
Select one best response for each question. Answers and explanations begin after Question 100.
SECTION 01 / QUESTIONS 1-10
Permits, plans and installation accountability
001. A contractor has a construction approval but intends to install a septic system in a different
location than the approved plan. What should be done first?
A. Resolve the change through the required amended-plan and approval process before proceeding.
B. Install the system where excavation is easiest and record the change at closeout.
C. Ask the equipment operator to approve the new layout.
D. Rely on a verbal field waiver from a neighbor.
002. Who bears responsibility for installation work performed under a New Hampshire installer
permit number?
A. Only the excavation subcontractor.
B. The permitted installer whose number is used.
C. The tank manufacturer, regardless of field work.
D. The eventual homeowner in every case.
003. During construction, where must a New Hampshire ISDS construction approval be posted?
A. Inside the installer's locked vehicle only.
B. At the distributor's office.
C. At a site location readily visible from a public way.
D. Only inside the completed dwelling.
004. What is the primary document controlling septic-system elevations and component locations
during construction?
A. An informal sketch made after excavation.
B. A sales brochure for the septic tank.
C. The NHDES-approved construction plan.
D. The machine operator's preferred grade.
005. Before requesting ordinary final inspection, which installation milestone should normally be
met?
A. Only the septic tank has been delivered.
B. The complete ISDS and applicable building foundation or slab are in place as shown on the approved plan.
C. The EDA has been covered and landscaped, without inspection.
D. A temporary pipe has been connected to a pump truck.
Independent practice questions | October 2026 rule review 3
, NEW HAMPSHIRE SEPTIC INSTALLER / EXAM 3 INSTALLATION & CONSTRUCTION
006. When site constraints restrict access, what partial-inspection option exists under the
February 2026 rules?
A. Unlimited partial inspections are automatic.
B. Any incomplete excavation may be covered without notice.
C. A partial inspection is a substitute for eventual system approval.
D. One partial inspection per site may be requested for a completed ISDS component when the stated conditions
apply.
007. A contractor says NHDES inspection replaces the installer's construction quality-control
checks. Which response is correct?
A. Correct; field quality checks cease once inspection is scheduled.
B. Correct if the system has two tanks.
C. NHDES inspection does not replace ongoing good construction oversight.
D. Correct only when a contractor has insurance.
008. Can an installer use a verbal field waiver to ignore an incorrect location on an approved plan?
A. Yes, if the trench is less than 60 inches wide.
B. Yes, whenever the inspector is busy.
C. No; the rules prohibit field waivers.
D. Yes, if the tank is larger than required.
009. What does RSA 485-A:36 generally require of a person commercially installing septic
systems?
A. Only a commercial driver license.
B. An installer permit, subject to statutory exemptions.
C. A permit only for systems with pumps.
D. No credential if a backhoe is used.
010. A homeowner building their own future domicile claims the permit exemption allows any
unverified installation. What is the best response?
A. The homeowner can ignore the state-approved plan.
B. The installer permit exemption also waives inspections.
C. The exemption has statutory conditions, including approved design compliance and required certification and
affidavit.
D. Any relative may certify the system without credentials.
SECTION 02 / QUESTIONS 11-20
Layout, benchmarks and basic calculations
Independent practice questions | October 2026 rule review 4
