04/06/2026
Colonial Vista Post Acute Legionella Detection
Colonial Vista Post Acute prioritizes the care and safety of our patients and staff above all else. When higher than normal traces of Legionella were found in our water supply over a month ago, we immediately notified the Local Health Jurisdiction, activated our Water Management Plan for residents and staff, and put a thorough Treatment Plan (prescribed by the Chelan Douglas Health District) into motion.
The water has been treated, special filters have been placed on taps and other water sources, and the WA DOH and Local Health Jurisdiction conducted an Environmental Assessment to ensure the water is safe to use, as well as continued water safety measures. All safety measures have been followed and met, and Colonial Vista Post Acute is taking all the prescribed steps, including partnering with the Chelan Douglas Health Officer, to handle this matter effectively, safely, and quickly. Neither residents nor staff are in any danger — residents are showering, bathing, drinking, and using ice machines as normal, and the Chelan Douglas Health District is managing the prescribed standard monitoring period with Colonial Vista’s partnership and cooperation.
FAQs about Legionella
-What is Legionella? Why is it found in water systems?
Legionella is a naturally occurring bacterium commonly found in man-made water systems. It can enter through natural water sources like lakes and streams.
-Is Legionella bacteria commonly found in building water systems?
Legionella is commonly found in building water systems, even well-maintained ones. Studies indicate it is present in approximately 50% of large building water systems. It is considered a normal part of plumbing system “microbiomes” or bacterial communities. However, despite how widespread Legionella is, Legionella-related infections are rare, accounting for only a small portion of community-acquired pneumonias. Infection requires a pathogenic Legionella strain, sufficient exposure, and a susceptible individual.
-If Legionella is commonly found in building water systems, why isn’t Legionnaires disease more widespread?
While Legionnaires’ disease cases occur across all U.S. states and many other countries, infections are relatively rare. For infection to happen, a susceptible individual must inhale enough quantities of pathogenic Legionella. Most water uses—such as drinking, handwashing, and toilet flushing—pose minimal risk since they do not create conditions for inhaling aerosolized droplets. Elderly individuals or those with weakened immune systems are more susceptible to infection.
-When is a water management plan recommended?
A water management plan is recommended for buildings with complex plumbing systems, especially those serving high-risk populations like hospitals and nursing homes. These plans help maintain consistent water quality by identifying and managing risks, including bacteria such as Legionella.
-What common remediation measures reduce concentrations of Legionella in water systems?
Common remediation measures include flushing the water system, raising water temperatures, and implementing other engineering controls. If Legionnaires’ disease cases are linked to a building, health departments may recommend more measures such as chemical treatments.