Washington Administrative Code
Title 246 - Health, Department of
SEWER SYSTEMS
Chapter 246-272B - Large on-site sewage system regulations
Part 5 - CONSTRUCTION REQUIREMENTS
Section 246-272B-05200 - Water tightness testing of sewage tanks
Universal Citation: WA Admin Code 246-272B-05200
Current through Register Vol. 24-18, September 15, 2024
The design engineer shall verify that all sewage tanks used in the LOSS are tested for water tightness by either vacuum testing or water-pressure testing.
(1) Vacuum testing steps:
(a) Seal the empty
tank;
(b) Temporarily seal access
openings, risers, and inlet and outlet pipes; and
(c) Introduce negative pressure into the tank
and apply a vacuum to four inches (one hundred millimeters) of
mercury.
(d) The tank passes if
ninety percent of vacuum is held for two minutes.
(2) Water-pressure testing steps:
(a) Seal the empty tank;
(b) Seal access openings, risers, and inlet
and outlet pipes;
(c) Fill the tank
with water two inches into the riser and let stand for twenty-four hours;
and
(d) Add water to the tank, if
necessary, to the original level.
(e) The tank passes if the water level is
unchanged after one hour.
(3) The design engineer shall reject tanks that do not meet the water tightness standard.
(4) If the tank fails, the owner may try to repair and retest the tank.
(a) The test must
be completed according to the requirements of subsection (2) or (3) of this
section.
(b) If the water-pressure
test method is used, the twenty-four hour standing time is not
required.
Statutory Authority: RCW 70.118B.020. 11-12-035, § 246-272B-05200, filed 5/25/11, effective 7/1/11.
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