For instructions on how to use our data dashboards, please see our dashboard tool page.
Data Notes
In 2024, DOH performed data cleaning, which has resulted in differences between the updated dashboard and the individual PDF reports on the Washington Department of Health website. Additionally, because some PDF reports contain missing water fixture information and/or sample data, we cannot compare the initial and post-remediation testing results for different fixtures.
The 2018-2020 dataset is also not directly comparable to the data collected from 2022 onwards due to different variables within the data sets. Additionally, the program had different sampling standards and data collection categories, as well as data quality processes. The older dataset should be interpreted and analyzed on its own. The PDF reports should not be used for data analysis. If you have any questions or concerns, please contact LISDW program at leadfreekids@doh.wa.gov.
The data does not contain test results from external contracted testing outside of DOH, e.g., schools who have done sampling through contractors. Please contact the school district directly for complete testing data.
For analytic purposes test results that come in as “<1ppb” are treated as a 0.
Data Limitations
The remediation threshold was changed to 5ppb from 10ppb in 2021 and is reflected in the dashboard. While some test results obtained before 2021 may have been under the previous threshold (i.e., 10 ppb) and therefore did not require remediation at the time of sampling, those fixtures may now require remediation to meet the lower remediation threshold requirement of RCW 28A.210.410.