Water Quality Reports

OARS monitors water quality, aquatic plant biomass, and streamflow to assess the health of our rivers. The information collected provides the foundation for our science-based advocacy. A summary of the latest water quality report can be found here.

Our reports:
2023 Water Quality Report -------------------- 2023 Data
2022 Water Quality Report ------------------------- 2022 Data
2020-2021 Water Quality Report ------------------ 2020 Data 2021 Data
2018-2019 Water Quality Report ------------------ 2018 Data 2019 Data
2017 Water Quality Report -------------------------- 2017 Data
2016 Water Quality Report
2015 Water Quality Report
2014 Water Quality Report
2012-2013 Water Quality Report
2011 Water Quality Report
2009-2010 Water Quality Report
2007-2008 Water Quality Report
2006 Water Quality Report
2005 Water Quality Report
2005 Biomass Report
2005 Biomass Appendix
2004 Water Quality Report
2003 Water Quality Report
2002 Water Quality Report
2001 Water Quality Report
2000 Water Quality Report
1999 Water Quality Report
1992 Water Quality Report

Contact OARS for full water quality data.