The Lake Whatcom watershed is located in Whatcom County in the northwest corner of Washington State. The watershed is not just a source of drinking water for residents. This watershed provides a place to live for a variety of animals, fish and humans alike. It has also played an important role in the community's history of logging, mining, and lumber mills. In this section, you can learn about the lake and watershed, water quality and monitoring, water supply and treatment, fish and wildlife, and geology.
 Learn More
Learn about Lake Whatcom and its Watershed.
Lake Whatcom is the source of drinking water for over 95,000 people living in Whatcom County and the City of Bellingham. Learn more about how your water is supplied and treated.

While the water supplied by our water treatment plants is some of the cleanest drinking water in the nation, the water quality of Lake Whatcom has started to decrease in recent decades due to a number of water quality challenges. Learn more about water quality trends here. 

Learn more about the wide variety of native and non-native fish and wildlife species that are present in the Lake Whatcom Watershed.

Learn more about how Lake Whatcom and its watershed were formed during the last Ice Age.