Anchorage Water Hardness & Quality Report (2026)

Anchorage Water and Wastewater Utility (AWWU) serves over 250,000 residents across the Municipality of Anchorage, including Eagle River-Chugiak and Girdwood. Primary sources are surface water from Ship Creek and Eklutna Lake, treated at the AWWU Ship Creek Treatment Plant (serving downtown and west Anchorage) and the Eklutna Water Treatment Plant (east side). A small groundwater component supplements supply via wells in glacial aquifers. AWWU has been recognized for delivering Alaska's best-rated drinking water.

The Ship Creek watershed drains 127 square miles from the Chugach Mountains, while Eklutna Lake captures glacial outflow from the Eklutna River valley. The geology features granitic intrusions and metamorphic rocks — including schists and gneisses from the Tertiary Coast Mountains Batholith — with thin glacial overburden that limits mineral leaching. Glacial meltwater passes through limestone-poor formations with short contact time and is further diluted by snowmelt, yielding a soft supply with low dissolved calcium and magnesium.

As soft water, Anchorage's supply minimizes scale buildup in pipes, heaters, and appliances, reducing maintenance needs for water heaters, dishwashers, and laundry machines. No significant spotting occurs on glassware or fixtures, and soap and detergents lather efficiently, often requiring less product. A water softener is not recommended and could introduce excess sodium unnecessarily. AWWU maintains excellent EPA compliance, including non-detectable lead levels well below action limits and full copper rule adherence. Fluoridation targets 0.7 ppm per local code. Treatment involves coagulation, filtration, disinfection with chloramine, and pH adjustment; water is praised for purity from protected glacial sources, with no PFAS data reported.