NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
• SEPTEMBER 2026 RULES EDITION
NEW HAMPSHIRE
SEPTIC INSTALLER
EXAM 2 / System Installation & Construction
100 ORIGINAL EXAM-STYLE QUESTIONS + FULL ANSWER KEY + DETAILED RATIONALES
SCHEMATIC / GRAVITY INSTALLATION SEQUENCE
EFFLUENT
AREA
BUILDING SEPTIC D-BOX
sewer TANK equal outlets
Diagram is conceptual only; actual plans, elevations, setbacks and system type control.
100 10 3
new MCQs focused topic areas sentence rationales
Prepared with reference to New Hampshire Env-Wq 1000, readopted effective February 1, 2026. Regulatory questions reflect the
rules in force as of September 2026. This is an independent practice test, not an NHDES publication or a reproduction of actual
permit-exam questions.
Suggested timed attempt: 130 minutes • Suggested self-study target: 80/100 (not an official pass mark).
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 1
,NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
How to use this exam
Choose the single best answer for each of the 100 questions. Enter answers on the response sheet; do not look at the key
before finishing. After grading, use the full rationale section to review every missed rule, calculation, or field judgment.
EXAM 2 CONTENT MAP
001-010 APPROVALS, DESIGN CHANGES & OVERSIGHT
011-020 PLANS, LEVELS & SITE READINESS
021-030 SEWER PIPING, CROSSINGS & GRADES
031-040 TANK SIZING, LOADS & SETTING
041-050 BAFFLES, ACCESS & COMPARTMENTS
051-060 DISTRIBUTION BOXES & EFFLUENT PIPING
061-070 SOIL PRESERVATION, EXCAVATION & FILL
071-080 CONVENTIONAL BEDS, TRENCHES & QUANTITIES
081-090 PRESSURE NETWORKS & SPECIAL COMPONENTS
091-100 INTEGRATED FIELD DECISIONS & INSPECTION
READER NOTES
Scope. This PDF emphasizes field installation and construction, with regulatory details for permits, plan changes, septic
tanks, sewer lines, drainfields, distribution, and inspection. ISDS means individual sewage disposal system; EDA means
effluent disposal area; D-box means distribution box.
Authority and accuracy. Approved project documents and current NHDES rules control real work. Different approved
system types may have manufacturer-specific requirements and exceptions. Always check site-specific plans and the
newest regulations before performing construction.
Score meaning. The suggested self-check target is purely a study aid; it is not an official NHDES passing score or a promise
that any candidate will pass.
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 2
,NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
Practice response sheet
Mark one letter per question. Circle any item you want to revisit after the timed attempt.
001 A / B / C / D 026 A / B / C / D 051 A / B / C / D 076 A / B / C / D
002 A / B / C / D 027 A / B / C / D 052 A / B / C / D 077 A / B / C / D
003 A / B / C / D 028 A / B / C / D 053 A / B / C / D 078 A / B / C / D
004 A / B / C / D 029 A / B / C / D 054 A / B / C / D 079 A / B / C / D
005 A / B / C / D 030 A / B / C / D 055 A / B / C / D 080 A / B / C / D
006 A / B / C / D 031 A / B / C / D 056 A / B / C / D 081 A / B / C / D
007 A / B / C / D 032 A / B / C / D 057 A / B / C / D 082 A / B / C / D
008 A / B / C / D 033 A / B / C / D 058 A / B / C / D 083 A / B / C / D
009 A / B / C / D 034 A / B / C / D 059 A / B / C / D 084 A / B / C / D
010 A / B / C / D 035 A / B / C / D 060 A / B / C / D 085 A / B / C / D
011 A / B / C / D 036 A / B / C / D 061 A / B / C / D 086 A / B / C / D
012 A / B / C / D 037 A / B / C / D 062 A / B / C / D 087 A / B / C / D
013 A / B / C / D 038 A / B / C / D 063 A / B / C / D 088 A / B / C / D
014 A / B / C / D 039 A / B / C / D 064 A / B / C / D 089 A / B / C / D
015 A / B / C / D 040 A / B / C / D 065 A / B / C / D 090 A / B / C / D
016 A / B / C / D 041 A / B / C / D 066 A / B / C / D 091 A / B / C / D
017 A / B / C / D 042 A / B / C / D 067 A / B / C / D 092 A / B / C / D
018 A / B / C / D 043 A / B / C / D 068 A / B / C / D 093 A / B / C / D
019 A / B / C / D 044 A / B / C / D 069 A / B / C / D 094 A / B / C / D
020 A / B / C / D 045 A / B / C / D 070 A / B / C / D 095 A / B / C / D
021 A / B / C / D 046 A / B / C / D 071 A / B / C / D 096 A / B / C / D
022 A / B / C / D 047 A / B / C / D 072 A / B / C / D 097 A / B / C / D
023 A / B / C / D 048 A / B / C / D 073 A / B / C / D 098 A / B / C / D
024 A / B / C / D 049 A / B / C / D 074 A / B / C / D 099 A / B / C / D
025 A / B / C / D 050 A / B / C / D 075 A / B / C / D 100 A / B / C / D
Name: ___________________________________________ Date: ____________________
Correct answers: _____ / 100 Study sections to revisit: ______________________________
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 3
, NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
01 | APPROVALS, DESIGN CHANGES & OVERSIGHT QUESTIONS 001-010
Select the single best response. More than one action may sound plausible; choose the one required by the cited rule or
supported by the facts.
001. A crew exposes ledge at the designed bed bottom. The contractor proposes raising the approved bed bottom
by six inches. What must happen before that change is built?
A. A field inspector may verbally waive any bed-bottom change.
B. The installer may raise it if the tank is unchanged.
C. The crew may record the change only on the invoice.
D. A permitted designer obtains a new construction approval for the changed bed-bottom elevation.
002. A specified distribution-box brand becomes unavailable; an otherwise equivalent brand will be used without
changing the approved design or requesting a waiver. Which review route is provided in the rule?
A. No documentation is needed when the box looks similar.
B. The supplier can amend the approval without the designer.
C. A stamped amended plan may be presented to the field inspector at inspection under the listed conditions.
D. A fresh soil test is always mandatory.
003. A gravity system cannot serve the relocated building, so the contractor proposes adding an effluent pump.
Which action is required?
A. Ask the electrician to sign the septic plan.
B. Have the permitted designer seek a new construction approval before installing the pump system.
C. Install the pump and obtain owner approval only.
D. Treat the pump as an unregulated spare part.
004. An EDA can remain at its approved elevation and footprint, but its horizontal location must shift 8 feet.
Assuming applicable conditions are met, which is the likely plan-approval route?
A. No review because the shift is below 20 feet.
B. Automatic approval when a town inspector arrives.
C. Designer-submitted amended plan reviewed by NHDES design review staff before requesting inspection.
D. A waiver written by the equipment operator.
005. A proposed EDA relocation would move the bed 13 feet horizontally from its approved position. What is the
correct response?
A. Use a new ISDS construction-approval application prepared by the permitted designer.
B. Move it and note the distance on the inspection request.
C. Use the field-inspector-only amendment route regardless of distance.
D. Ask the excavator to certify the soil profile.
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 4
• SEPTEMBER 2026 RULES EDITION
NEW HAMPSHIRE
SEPTIC INSTALLER
EXAM 2 / System Installation & Construction
100 ORIGINAL EXAM-STYLE QUESTIONS + FULL ANSWER KEY + DETAILED RATIONALES
SCHEMATIC / GRAVITY INSTALLATION SEQUENCE
EFFLUENT
AREA
BUILDING SEPTIC D-BOX
sewer TANK equal outlets
Diagram is conceptual only; actual plans, elevations, setbacks and system type control.
100 10 3
new MCQs focused topic areas sentence rationales
Prepared with reference to New Hampshire Env-Wq 1000, readopted effective February 1, 2026. Regulatory questions reflect the
rules in force as of September 2026. This is an independent practice test, not an NHDES publication or a reproduction of actual
permit-exam questions.
Suggested timed attempt: 130 minutes • Suggested self-study target: 80/100 (not an official pass mark).
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 1
,NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
How to use this exam
Choose the single best answer for each of the 100 questions. Enter answers on the response sheet; do not look at the key
before finishing. After grading, use the full rationale section to review every missed rule, calculation, or field judgment.
EXAM 2 CONTENT MAP
001-010 APPROVALS, DESIGN CHANGES & OVERSIGHT
011-020 PLANS, LEVELS & SITE READINESS
021-030 SEWER PIPING, CROSSINGS & GRADES
031-040 TANK SIZING, LOADS & SETTING
041-050 BAFFLES, ACCESS & COMPARTMENTS
051-060 DISTRIBUTION BOXES & EFFLUENT PIPING
061-070 SOIL PRESERVATION, EXCAVATION & FILL
071-080 CONVENTIONAL BEDS, TRENCHES & QUANTITIES
081-090 PRESSURE NETWORKS & SPECIAL COMPONENTS
091-100 INTEGRATED FIELD DECISIONS & INSPECTION
READER NOTES
Scope. This PDF emphasizes field installation and construction, with regulatory details for permits, plan changes, septic
tanks, sewer lines, drainfields, distribution, and inspection. ISDS means individual sewage disposal system; EDA means
effluent disposal area; D-box means distribution box.
Authority and accuracy. Approved project documents and current NHDES rules control real work. Different approved
system types may have manufacturer-specific requirements and exceptions. Always check site-specific plans and the
newest regulations before performing construction.
Score meaning. The suggested self-check target is purely a study aid; it is not an official NHDES passing score or a promise
that any candidate will pass.
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 2
,NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
Practice response sheet
Mark one letter per question. Circle any item you want to revisit after the timed attempt.
001 A / B / C / D 026 A / B / C / D 051 A / B / C / D 076 A / B / C / D
002 A / B / C / D 027 A / B / C / D 052 A / B / C / D 077 A / B / C / D
003 A / B / C / D 028 A / B / C / D 053 A / B / C / D 078 A / B / C / D
004 A / B / C / D 029 A / B / C / D 054 A / B / C / D 079 A / B / C / D
005 A / B / C / D 030 A / B / C / D 055 A / B / C / D 080 A / B / C / D
006 A / B / C / D 031 A / B / C / D 056 A / B / C / D 081 A / B / C / D
007 A / B / C / D 032 A / B / C / D 057 A / B / C / D 082 A / B / C / D
008 A / B / C / D 033 A / B / C / D 058 A / B / C / D 083 A / B / C / D
009 A / B / C / D 034 A / B / C / D 059 A / B / C / D 084 A / B / C / D
010 A / B / C / D 035 A / B / C / D 060 A / B / C / D 085 A / B / C / D
011 A / B / C / D 036 A / B / C / D 061 A / B / C / D 086 A / B / C / D
012 A / B / C / D 037 A / B / C / D 062 A / B / C / D 087 A / B / C / D
013 A / B / C / D 038 A / B / C / D 063 A / B / C / D 088 A / B / C / D
014 A / B / C / D 039 A / B / C / D 064 A / B / C / D 089 A / B / C / D
015 A / B / C / D 040 A / B / C / D 065 A / B / C / D 090 A / B / C / D
016 A / B / C / D 041 A / B / C / D 066 A / B / C / D 091 A / B / C / D
017 A / B / C / D 042 A / B / C / D 067 A / B / C / D 092 A / B / C / D
018 A / B / C / D 043 A / B / C / D 068 A / B / C / D 093 A / B / C / D
019 A / B / C / D 044 A / B / C / D 069 A / B / C / D 094 A / B / C / D
020 A / B / C / D 045 A / B / C / D 070 A / B / C / D 095 A / B / C / D
021 A / B / C / D 046 A / B / C / D 071 A / B / C / D 096 A / B / C / D
022 A / B / C / D 047 A / B / C / D 072 A / B / C / D 097 A / B / C / D
023 A / B / C / D 048 A / B / C / D 073 A / B / C / D 098 A / B / C / D
024 A / B / C / D 049 A / B / C / D 074 A / B / C / D 099 A / B / C / D
025 A / B / C / D 050 A / B / C / D 075 A / B / C / D 100 A / B / C / D
Name: ___________________________________________ Date: ____________________
Correct answers: _____ / 100 Study sections to revisit: ______________________________
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 3
, NH | SEPTIC INSTALLER • EXAM 2 INDEPENDENT PRACTICE • 2026/2027
01 | APPROVALS, DESIGN CHANGES & OVERSIGHT QUESTIONS 001-010
Select the single best response. More than one action may sound plausible; choose the one required by the cited rule or
supported by the facts.
001. A crew exposes ledge at the designed bed bottom. The contractor proposes raising the approved bed bottom
by six inches. What must happen before that change is built?
A. A field inspector may verbally waive any bed-bottom change.
B. The installer may raise it if the tank is unchanged.
C. The crew may record the change only on the invoice.
D. A permitted designer obtains a new construction approval for the changed bed-bottom elevation.
002. A specified distribution-box brand becomes unavailable; an otherwise equivalent brand will be used without
changing the approved design or requesting a waiver. Which review route is provided in the rule?
A. No documentation is needed when the box looks similar.
B. The supplier can amend the approval without the designer.
C. A stamped amended plan may be presented to the field inspector at inspection under the listed conditions.
D. A fresh soil test is always mandatory.
003. A gravity system cannot serve the relocated building, so the contractor proposes adding an effluent pump.
Which action is required?
A. Ask the electrician to sign the septic plan.
B. Have the permitted designer seek a new construction approval before installing the pump system.
C. Install the pump and obtain owner approval only.
D. Treat the pump as an unregulated spare part.
004. An EDA can remain at its approved elevation and footprint, but its horizontal location must shift 8 feet.
Assuming applicable conditions are met, which is the likely plan-approval route?
A. No review because the shift is below 20 feet.
B. Automatic approval when a town inspector arrives.
C. Designer-submitted amended plan reviewed by NHDES design review staff before requesting inspection.
D. A waiver written by the equipment operator.
005. A proposed EDA relocation would move the bed 13 feet horizontally from its approved position. What is the
correct response?
A. Use a new ISDS construction-approval application prepared by the permitted designer.
B. Move it and note the distance on the inspection request.
C. Use the field-inspector-only amendment route regardless of distance.
D. Ask the excavator to certify the soil profile.
Rule references: NH Env-Wq 1000 (effective Feb. 1, 2026) • Not an official NHDES test 4
