Martha Lake Water Hardness & Quality Report (2026)

While there isn't a single utility managing the water directly from Martha Lake, residents in the Snohomish County area receive their supply from nearby districts like the Cross Valley Water District and Alderwood Water & Wastewater District. Cross Valley Water District blends groundwater from 11 wells tapping local glacial aquifers with surface water from the City of Everett's supply, which originates from the Spada Reservoir on the Sultan River. The water undergoes standard filtration, disinfection, and corrosion control before reaching homes north of the Tulalip Reservation.

The geology around Martha Lake is characterized by unconsolidated sediments from the Pleistocene Fraser Glaciation, including glacial till and outwash sands and gravels. These materials overlay older Tertiary bedrock. This geological makeup, part of the Puget Lowland physiographic province, typically results in soft water. The water's character is influenced by rainwater percolating through coarse, acidic soils and Quaternary sediments, rather than dissolving minerals from carbonate-rich formations like limestone or dolomite.

Because the water is very soft, you're unlikely to see much scale buildup on your fixtures, pipes, or appliances such as water heaters and dishwashers. This generally extends the life of your equipment and means you'll use less soap and detergent. Some people find very soft water feels a bit slippery in the shower. On occasion, very soft water with a low pH can potentially leach more copper from new plumbing. A water softener isn't typically recommended, but basic filtration can improve aesthetics, or targeted conditioners can be used if pipe corrosion becomes a concern during maintenance checks show.