Sentry Internet

Washington State Water System Data

Who uses Sentry Internet data and why?

Consumers - Use this data to find information on the water system supplying drinking water to your home. You can also check the system's water testing results to see what's in your drinking water. College students may use water quality and chemical data in research studies.

Consultants - Review or download the most recent Water Facility Inventory (WFI) for a water system(s), review water quality data to produce the annual Consumer Confidence Report.

Lending Institutions/Realtors - Review information for Pre-Adequacy Reports. This may include the capacity of a water system for new hookups, water quality data, and whether or not the system is approved.

Local Health Jurisdictions - Review most recent WFI for your county. Review information for pre-adequacy reports. Get most recent contact information for water systems--addresses, phone numbers. Review Sanitary Survey information.

Utilities - Get contact information to notify owners/operators of water systems before constructing or excavating in the area.

Water System Owners and Operators - Review or download your most recent WFI for updating. Use data to produce your annual Consumer Confidence Report. Verify that your system's water quality data has been entered into our database.

Two ways to get data

  1. Access Sentry Internet to get your data.

    See quick start instructions for accessing Sentry Internet and getting downloads and reports. Important: Before accessing Sentry Internet make sure Pop-Up Blockers are disabled on your computer toolbars. View instructions for disabling pop-up blockers (PDF).

    If you have questions about Sentry Internet contact our Help Desk.
  2. You can also request the data in Sentry Internet from our regional office staff. Allow 4-6 weeks for processing.

Map of defined regions (PDF)

Eastern Regional Office
16201 E. Indiana Ave. Suite 1500
Spokane Valley, WA 99216
509-329-2100 Fax: 509-329-2104

Northwest Regional Office
20425 72nd Ave. S.
Building 2, Suite 310
Kent, WA 98032-2358
253-395-6750 Fax: 253-395-6760

Southwest Regional Office
243 Israel Road S.E.
P.O. Box 47823
Olympia, WA 98501-7823
360-236-3030 Fax: 360-236-3029

Note: If you are searching for a specific water system, and not just lists of systems by county and so on, you need to know the actual water system name or water system ID number:

You can get this information:

  • From your water bill.
  • From the homeowner's association or community residents.
  • By following the Quick Start directions in the right column. From the "Find Water System" page enter as much information about the water system as you know, select your county, click on "Submit." You may be able to identify your water system in the list that displays.

Data not in Sentry Internet

Some data is not available through Sentry Internet. If you cannot find the data you need, submit your request to our Help Desk. Someone will respond within two business days.

GIS Data

Source Water Assessment Program

For assistance, e-mail our Help Desk.