Integrated Water Quality Monitoring and Assessment Reports

The Integrated Water Quality Monitoring and Assessment Report or "Integrated Report" (IR) summarizes water quality data collected by the DEP as well as numerous other state, federal and tribal government agencies, volunteer water monitoring organizations, and other sources. The Integrated Report is also known as the 305(b) report and 303(d) list because it is required by Sections 305(b) and 303(d) of the Clean Water Act.

The Clean Water Act requires states to submit an Integrated Report to EPA every even-numbered year. Monitoring information is analyzed by the DEP to assess the ability of Maine 's water resources to meet uses such as drinking water, aquatic life support, fishing or recreation as established by Maine's Water Classification laws.

The 303(d) list of impaired waters identifies the waters not meeting one or more of their designated uses and is included in Appendices in the Integrated Report. The Integrated Report also provides detailed atlas information on miles and acreage of aquatic resources in Maine and information on groundwater resources, however, an assessment of specific use support is not provided for those waters.

Each even-year cycle MDEP first posts a draft Integrated Report for public comment. The final version with responses to comments is posted below.

Contact

Email: IRComments.DEP@maine.gov

Meagan Sims, 207-508-8776
Maine Department of Environmental Protection
State House Station #17
Augusta, ME 04333

2024 DRAFT Integrated Water Quality Monitoring and Assessment Report

• 2024 Report (pdf) (210 pages); 2024 Appendices (pdf) (296 pages)
• Integrated Report Segments - 2024 (Under Development):
• Web Map
• Download KMZ (NOTE: Must have Google Earth to open this file. This KMZ might take a minute or more to initially download due to its large size.)
• Download ArcGIS Map Package (NOTE: Must have a licensed copy of ArcGIS Pro software installed to open this file.)

2018/2020/2022 Integrated Water Quality Monitoring and Assessment Report

• 2022 Report (pdf) (219 pages); 2022 Appendices (pdf) (249 pages)
• Submission letter to EPA (pdf)
• EPA approval letter (pdf) and document (pdf) (5/25/2022)

2016 Integrated Water Quality Monitoring and Assessment Report

• 2016 Report (pdf) (187 pages); 2016 Appendices (pdf) (212 pages)
• Submission letter to EPA (pdf)
• EPA approval letter and document (pdf)

2014 Integrated Water Quality Monitoring and Assessment Report

• 2014 Report (pdf) (190 pages); 2014 Appendices (pdf) (181 pages)
• Submission letter to EPA (pdf)
• EPA approval letter (pdf) and document (pdf)

2012 Integrated Water Quality Monitoring and Assessment Report

• 2012 Report (pdf) (219 pages); 2012 Appendices (pdf) (146 pages)
• Submission letter to EPA (pdf)
• EPA approval letter (pdf) and document (pdf)

2010 Integrated Water Quality Monitoring and Assessment Report

• 2010 Report (pdf) (204 pages); 2010 Appendices (pdf) (including 303d list) (124 pages)
• Submission letter to EPA (pdf)
• EPA approval letter (pdf) and document (pdf)

2008 Integrated Water Quality Monitoring and Assessment Report

• 2008 Report (pdf) (147 pages); 2008 Appendices (pdf), including 303d list (102 pages)
• EPA approval letter for 2008 report (pdf); approval documentation (pdf)
• 6/9/2009 addendum (pdf)

2006 Integrated Water Quality Monitoring and Assessment Report

• 2006 Report (pdf) (195 pages); 2006 Appendices (pdf) (including 303d list) (113 pages)
• EPA approval letter for 2006 report (pdf)