- Washington State Department of Ecology
- Washington State Department of Health Drinking Water Information
- Washington Utilities and Transportation Commission
- King County Water and Land Services
- Kitsap County Drinking Water Information
- Pierce County Health Department
- Thurston County Health Department, Water & Waste Management
- Mason County Drinking Water Program
- Clallam County Drinking Water Program
- San Juan County Drinking Water Program
- USGS Water Resources of the United States
- American Water Works Association
- Call Before You Dig!
- Evergreen Rural Water of Washington