WASHINGTON STATE SEPTIC
INSTALLERS EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
What is the minimum separation for a well or suction line (list all 3) - ANS 100', 50', 50'
what is the minimum separation for a public well (list all 3) - ANS 100',100',100'
what is the minimum separation for a water main (list all 3) - ANS 10',10',10'
what is the minimum separation for a surface water table at normal height - ANS 100',50',10'
soil type 1 - ANS Gravelly and very gravelly coarse sands, all extremely gravelly soils excluding
soil types 5 and 6, all soil types with greater than or equal to 90% rock fragments.
soil type 2 - ANS Coarse sands.
solid type 3 - ANS Medium sands, loamy coarse sands, loamy medium sands
soil type 4 - ANS Fine sands, loamy fine sands, sandy loams, loams.
@2026/2027 ALLRIGHTS RESERVED.
, soil type 5 - ANS Very fine sands, loamy very fine sands; or silt loams, sandy clay loams, clay
loams and silty clay loams with a moderate or strong structure
soil type 6 - ANS Other silt loams, sandy clay loams, clay loams, silty clay loams.
soil type 7 - ANS Sandy clay, clay, silty clay, strongly cemented or firm soils
what is the minimum design flow per capita per day - ANS 45 gpd
what is the minimum design flow per bedroom per day - ANS 120 gpd or 90 gallons x 1.33
per bedroom
what is the minimum design limit for a 3 bedroom home - ANS 900 gallons
what is the maximum effluent loading rate for soil type 1 - ANS 1 gallon per sqft per day
what is the maximum effluent loading rate for soil type 2 - ANS 1 gallon per sqft per day
what is the maximum effluent loading rate for soil type 3 - ANS .8 gallon per sqft per day
what is the maximum effluent loading rate for soil type 4 - ANS .6 gallon per sqft per day
what is the maximum effluent loading rate for soil type 5 - ANS .4 gallon per sqft per day
@2026/2027 ALLRIGHTS RESERVED.
INSTALLERS EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
What is the minimum separation for a well or suction line (list all 3) - ANS 100', 50', 50'
what is the minimum separation for a public well (list all 3) - ANS 100',100',100'
what is the minimum separation for a water main (list all 3) - ANS 10',10',10'
what is the minimum separation for a surface water table at normal height - ANS 100',50',10'
soil type 1 - ANS Gravelly and very gravelly coarse sands, all extremely gravelly soils excluding
soil types 5 and 6, all soil types with greater than or equal to 90% rock fragments.
soil type 2 - ANS Coarse sands.
solid type 3 - ANS Medium sands, loamy coarse sands, loamy medium sands
soil type 4 - ANS Fine sands, loamy fine sands, sandy loams, loams.
@2026/2027 ALLRIGHTS RESERVED.
, soil type 5 - ANS Very fine sands, loamy very fine sands; or silt loams, sandy clay loams, clay
loams and silty clay loams with a moderate or strong structure
soil type 6 - ANS Other silt loams, sandy clay loams, clay loams, silty clay loams.
soil type 7 - ANS Sandy clay, clay, silty clay, strongly cemented or firm soils
what is the minimum design flow per capita per day - ANS 45 gpd
what is the minimum design flow per bedroom per day - ANS 120 gpd or 90 gallons x 1.33
per bedroom
what is the minimum design limit for a 3 bedroom home - ANS 900 gallons
what is the maximum effluent loading rate for soil type 1 - ANS 1 gallon per sqft per day
what is the maximum effluent loading rate for soil type 2 - ANS 1 gallon per sqft per day
what is the maximum effluent loading rate for soil type 3 - ANS .8 gallon per sqft per day
what is the maximum effluent loading rate for soil type 4 - ANS .6 gallon per sqft per day
what is the maximum effluent loading rate for soil type 5 - ANS .4 gallon per sqft per day
@2026/2027 ALLRIGHTS RESERVED.
