Water Quality Analyses
Seattle Public Utilities' Water Quality Annual Reports (Consumer Confidence Reports) provide analyses of the Cedar River and Tolt River drinking water supplies, with information about regulated compounds that have been detected in our drinking water, and additional information about drinking water sources, protection, treatment, testing, and compliance.
The annual analyses provides additional information about regulated compounds, plus information about compounds that were not detected, and compounds that are not regulated or that relate to the aesthetics of the drinking water. The compounds listed in the Annual Analyses are divided into one of three groups:
- Primary Standards, which relate to public health. The public is notified if any of these levels are exceeded.
- Secondary Standards, which relate to aesthetic qualities such as taste, odor and appearance.
- Unregulated compounds, which are monitored in the interest of our customers, or to assist regulators in developing future regulations.
Before you proceed, you'll want to know which source provides your drinking water. More than 80 percent of the residences of Seattle receive their drinking water from the Cedar supply. Neighborhoods that regularly receive Tolt water include Broadview, Bitter Lake, Crown Hill, Northgate, Haller Lake, and Pinehurst, and parts of Maple Leaf, Wedgewood, Greenwood, View Ridge, and Roosevelt. All other areas of Seattle receive Cedar River water.
2022 Quarterly Analyses
- 4th Quarter Analysis 2022 (pdf)
- 3rd Quarter Analyses 2022 (pdf)
- 2nd Quarter Analyses 2022 (pdf)
- 1st Quarter Analyses 2022 (pdf)
2021 Quarterly Analyses
- 4th Quarter Analyses 2021 (pdf)
- 3rd Quarter Analyses 2021 (pdf)
- 2nd Quarter Analyses 2021 (pdf)
- 1st Quarter Analyses 2021 (pdf)
2020 Quarterly Analyses
- 4th Quarter Analyses 2020 (pdf)
- 3rd Quarter Analyses 2020 (pdf)
- 2nd Quarter Analyses 2020 (pdf)
- 1st Quarter Analyses 2020 (pdf)
2019 Quarterly Analyses
- 4th Quarter Analyses 2019 (pdf)
- 3rd Quarter Analyses 2019 (pdf)
- 2nd Quarter Analyses 2019 (pdf)
- 1st Quarter Analyses 2019 (pdf)
2018 Quarterly Analyses
- 4th Quarter Analyses 2018 (pdf)
- 3rd Quarter Analyses 2018 (pdf)
- 2nd Quarter Analyses 2018 (pdf)
- 1st Quarter Analyses 2018 (pdf)
2017 Quarterly Analyses
- 4th Quarter Analyses 2017 (pdf)
- 3rd Quarter Analyses 2017 (pdf)
- 2nd Quarter Analyses 2017 (pdf)
- 1st Quarter Analyses 2017 (pdf)
Archived Analyses
- 2016 Annual Analyses (pdf)
- 2015 Annual Analyses (pdf)
- 2014 Annual Analyses (pdf)
- 2013 Annual Analyses (pdf)
- 2012 Annual Analyses (pdf)
- 2011 Annual Analyses (pdf)
- 2010 Annual Analyses (pdf)
- Substances monitored but not detected (pdf)