Hi! My name is Talia West. I am senior at Bishop Blanchet and I am the volunteer Lake Washington Water Quality Specialist for Yarrow Point.

Throughout the summer, I will test E.coli levels at Road End Beach Park weekly and post them on the Town website. When E. coli bacteria is high, it can cause problems for swimmers, such as ear, skin, eye, and respiratory infections, as well as gastrointestinal illness. It could also affect animals and pets swimming in the lake. High E. Coli bacteria presence can also indicate nutrient pollution, fecal contamination, water quality problems, and poor aquatic ecosystem health.

After a meeting with Dr. Daniel Nidzgorski, a King County Ecologist, we learned that the most common way E. coli bacteria make their way into the water in King County is from animal waste, specifically water fowl like ducks and geese. It is common for storms or heavy rains to wash animal waste into our lakes, especially with the stereotypical rainfall in the Seattle-Metro area.

July 2, 2024 Analysis:

In our first round of testing July 2nd, I found that there is currently low bacteria in the lake and it is safe to swim. However, it is important to stay informed. If you are worried about bacteria, refrain from swallowing the lake water and shower after going into the lake. Thank you!

July 8, 2024 Analysis:

I hope everyone’s 4th of July weekend was safe and enjoyable! After tests run yesterday, July 7, 2024, they indicated 800 CFUs (colonies forming units) of E. coli bacteria per 100 mL of water. This indicates high levels of bacteria. This is a rise from last week’s 100 CFUs (which is a normal level). However, this is to be expected after the July 4th weekend and the incredible weather we had. With many more people in the lake, increased human activity nearby, and the extreme heat, we can expect a higher level of  E. coli bacteria. Stay informed as I continue to test throughout the week and anticipate the water levels return to normal ranges. Stay safe!