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Finding information on your water quality
Many people are interested in finding more information on their drinking water and where it comes from. Different kinds of information could be available for your water depending on where it comes from.
Individual private water sources
Individual private water sources are responsible for maintaining their water system, monitoring their water quality, and keeping records for their water system.
King County maintains some records on private individual water sources, because new projects and permits requiring an approved water source must be reviewed and approved by the County. On-site sewage system applications requiring the review of individual private water sources may be found at our King County Septic and Group B Records webpage. You may also reach out to the health department for assistance with this tool or if your individual private water system information is not included here.
Additionally, all new well constructions are supposed to have a water well report which are documents containing information on the well construction that are generated when the well is built. Well reports are submitted to and maintained by the state Department of Ecology. The Well Reports provide a wealth of information on the water wells such as well construction details, well depth, depth to water, gallons-per-minute water production, and the different geological layers around the well. To search for your well report, visit the Washington State Department of Ecology's Washington State Well Report Viewer.
Group B water systems
Group B water system owners, purveyors, administrators, and satellite management agencies should keep up-to-date records and test their water quality at least once per year. People connected to Group B Water systems should reach out to those responsible for its management and record keeping as a first step when trying to learn more about their water.
Group B water systems whose applications were reviewed and approved by King County before 2012 may be able to find their record files using King County Septic and Group B Records search. As of 2012, King County no longer reviews and approves applications and designs for new Group B water system. This is now handled by the Washington State Department of Health Office of Drinking Water.
When looking for missing record files for Group B water systems created after 2012, reach out to the Office of Drinking Water. You can search for additional information on the water system and water quality testing results history for Group B water systems by using the Sentry Internet Washington State Water System search tool. Like private wells, Group B wells may also have an associated water well report which can be found using the WA State Dept. of Ecology's Washington State Well Report Viewer.
Group A Water Systems
Most people in King County get their water from Group A community water systems, which must prepare yearly consumer confidence reports that give customer drinking water quality information. Consumer confidence reports can be found on most water provider websites. You can also search for the reports using the EPA's Consumer Confidence Report Search Tool. If you cannot find the consumer confidence report you are looking for, call or email the provider. For help understanding the report, contact the provider or the health department. You can also search for Group A water quality testing history and compliance using the Sentry Internet Washington State Water System search tool.