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City of Bellevue, WA Utilities
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Sewer System Overflow

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Water Quality

  • PFAS and Drinking Water
  • Backflow Prevention
  • Water Source
  • Boil Water Notices
  • Fats, Oils and Grease Control
  • Service Line Inventory
  • Sewer System Overflow
  • Water Efficiency Programs
Sewer Overflow Alert

Sunday, April 12: A sewer overflow occurred in the 200 block of W Lake Sammimsh Parkway. Public Health – Seattle & King County has advised that people and pets avoid the lake area highlighted in the map below until Sunday, April 19 at 10:15 a.m. 

Chinese (Traditional / Mandarin – ZH-HANT / CHT)

4 月 12 日(星期日): W Lake Sammamish Parkway 200 街區發生污水溢流。西雅圖與金郡公共衛生局(Public Health – Seattle & King County)建議民眾與寵物在 4 月 19 日(星期日)上午 10:15 之前避免進入下方地圖標示的區域。

Spanish (ES)

Domingo 12 de abril: Ocurrió un desbordamiento de alcantarillado en la cuadra 200 de W Lake Sammamish Parkway. Salud Pública – Seattle y el Condado de King (Public Health – Seattle & King County) ha recomendado que las personas y las mascotas eviten el área señalada en el mapa a continuación hasta el domingo 19 de abril a las 10:15 a. m.

Korean (KO)

4월 12일(일): W Lake Sammamish Parkway 200번지 구간에서 하수도 넘침이 발생했습니다. 시애틀 및 킹 카운티 공중보건국(Public Health – Seattle & King County)은 4월 19일(일) 오전 10시 15분까지 사람과 반려동물이 아래 지도에 표시된 지역을 피할 것을 권고했습니다.

Russian (RU)

Воскресенье, 12 апреля: В квартале 200 по W Lake Sammamish Parkway произошёл перелив канализации. Служба общественного здравоохранения Сиэтла и округа Кинг (Public Health – Seattle & King County) рекомендует людям и домашним животным избегать района, обозначенного на карте ниже, до воскресенья, 19 апреля, 10:15.

Japanese (JA)

4月12日(日): W Lake Sammamish Parkway の 200 番地付近で下水の溢流が発生しました。シアトル・キング郡公衆衛生局(Public Health – Seattle & King County)は、4月19日(日)午前10時15分まで、人およびペットが下記地図で示された区域を避けるよう呼びかけています。

Chinese (Simplified – ZH-HANS / CHS)

4 月 12 日(星期日): W Lake Sammamish Parkway 200 街区发生污水溢流。西雅图与金郡公共卫生局(Public Health – Seattle & King County)建议公众及宠物在 4 月 19 日(星期日)上午 10:15 之前避免进入下方地图标示的区域。

Vietnamese (VI)

Chủ Nhật, ngày 12 tháng 4: Đã xảy ra sự cố tràn nước thải tại khu vực dãy số 200 của W Lake Sammamish Parkway. Sở Y tế Công cộng Seattle & Quận King (Public Health – Seattle & King County) khuyến cáo người dân và vật nuôi tránh khu vực được đánh dấu trên bản đồ bên dưới cho đến 10:15 sáng Chủ Nhật, ngày 19 tháng 4.

W lake sammamish sewer overflow April 12 2026

What is a sewer system overflow?

Stay Out of the Water

A sewer system overflow is a release of untreated sewage from a sanitary sewer into lakes and streams, often due to an accumulation of fats, oils and grease, blockages from baby wipes, facial wipes and sanitary products, system failure or construction activities. 

What happens when the sewer overflows into a body of water, like a lake or a stream?

Untreated sewage can transmit diseases. When sewage enters the water, it can spread based on wind, water flow, rain events, volume of sewage and other factors. Sewage can stay in the water for days to weeks. Bellevue follows guidance provided by the Seattle-King County Public Health to determine the affected area and time frame of the issued advisory.

What should I do if I receive a notice to stay out of the water? 

Humans and pets should stay out of the water. There is a risk that illnesses can be contracted with exposure to untreated sewage. The nose, mouth, eyes or open wounds are particularly vulnerable pathways. Please share the notice with your neighbors. 

Can I still take my boat out in the lake when there has been a sewage release to the lake?

Yes, but based on Seattle-King County Public Health advisory, it's best to avoid the impacted area. 

What if I was in the water before I received the notice to stay out of the water? 

Take a cleansing shower immediately and monitor for any unusual symptoms. If you are concerned, seek advice from your healthcare provider.

How is the lake determined to be “safe” to swim?” 

Seattle-King County Public Health (SKCPH) experts advise the City of Bellevue on the closure time frame and the impacted areas. They provide a map based on the volume of sewage and the time it was released. 

How will I know it is safe to swim? 

The closure dates will be listed on the door tag and on this page.

Where can I find out more information? 

Washington State Department of Health 

King County Lakes Program

 

Alerts

Receive texts or emails when there is a sewer overflow.

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Utilities

Michaelene Fowler
Public Information Officer

Telephone
425-452-6145
Email
mfowler@bellevuewa.gov

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