Kennewick public works crews were scrambling Thursday to track down what triggered a series of water pressure alarms to go off at businesses near the Columbia Center mall.
Evelyn Lusignan, Kennewick's public information officer, said no customers called the city, but security companies did when signals indicated pressure variations in the municipal water system.
City employees tracked down a leak in a pipe coming from a city reservoir, and began turning off valves in the piping to isolate the trouble spot, Lusignan said.
The closing of valves apparently caused some higher-than-normal pressure elsewhere along the line, which triggered the alarms, she explained.
But the increased pressure shouldn't have triggered the alarms, as the pressure didn't reach the alarm threshold.
"We are continuing to investigate," Lusignan said.
City and fire department crews spent much of the morning trying to determine the cause of the alarms.
Buildings that had security alarms go off included Lowe's, the KGH Medical Mall, Kamiakin High School and several large stores at Columbia Center mall.