Diligent testing identified a hot water heater in the south building of the Keswick complex. The heater harbored a source of nitrates and nitrites that made their way into hot water service in the north half of Keswick’s south building.
This discovery fits with the facts as we have come to understand them over the past two days.
First of all, nitrates and nitrites can cause the types of symptoms that employees reported. Second, the north side of the south building, where running water with those chemicals was found, is served by that hot water heater. Third, that is also the side of the building where sickened employees have reported coming into contact with water in various ways: eating food cooked with hot water, drinking beverages made with hot water, or using restrooms.
Now that the hot water heater has been identified as the problem, it has been cut out of the system.