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Most water recreation facilities have two main drains to help prevent entrapment; however, there are still a few grandfathered facilities in Whatcom County that have single main drains. These systems must have emergency shutoff equipment installed that shuts off all pumps hooked to the recirculation lines for the pool(s) to prevent the possibility of entrapment.
This system must be tested at least twice annually—or more frequently if required by manufacturer—by the operator to ensure it works properly. It is considered a failure if the device doesn’t activate and shut down the pump within a few seconds. The operator should work with the manufacturer to fix, calibrate, or demonstrate that the device complies with WAC 246-260-041(11)(h) as installed. See this DOH guidance on single main drains for more information.
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