Integrated Report and Total Maximum Daily Loads

Data Acceptance Criteria

The Hawaii State Department of Health (HIDOH) is obligated by the Clean Water Act (CWA) Sections (§) 303(d) and §305(b) to report on the State’s water quality on a two-year cycle. In preparation for this, HIDOH will announce a call for data submissions on every odd-numbered year for reporting in even numbered years. For the Clean Water Branch to use submitted data, submittals must conform to the provided data acceptance criteria. The Data Submittal Form can be found here. Data that does not meet the data submittal criteria may not be considered for use in the Integrated Report.

Clean Water Act 303(d) List

On August 16, 2018, the U.S. Environmental Protection Agency (EPA) approved the 2018 State of Hawaii Water Quality Monitoring and Assessment Report.  This report provides a single, integrated submittal for fulfilling federal requirements under Sections (§) 303(d) and 305(b) of the Clean Water Act.  With this approval, the 2018 303(d) List of Impaired Waters (represented by those water bodies assigned to categories 4 and 5 in Chapter 3, 2018 §303(d) and §305(b) Water Body Assessments for Hawaii), is now in effect.

Current & Prior Reports

The 2020 State of Hawaii Water Quality Monitoring and Assessment Report can also be accessed at EPA’s website. Please click here to be redirected to that page.

2018 State of Hawaii Water Quality Monitoring and Assessment Report

2016 State of Hawaii Water Quality Monitoring and Assessment Report

2014 State of Hawaii Water Quality Monitoring and Assessment Report

2010 and older reports can be found in our Library

The Total Maximum Daily Load (TMDL) Process

The TMDL process serves as a roadmap for water body restoration by focusing on improving water quality in impaired surface waters identified in the biennial State of Hawaii Water Quality Monitoring and Assessment Report. TMDLs identify sources of pollution within a watershed and determine pollutant load reductions required for a water body to meet water quality standards. The TMDL process is a vital component of implementing water quality improvement projects under Clean Water Act Section 319(h) grants, administered by the Department of Health, Polluted Runoff Control Program.

Additional information on TMDLs can be found on the U.S.Environmental Protection Agency TMDL website.

Ka’elepulu/Enchanted Lake Assessment Project

The Hawaii State Department of Health (HDOH) Clean Water Branch (CWB) is conducting a water quality assessment project in the Ka’elepulu watershed. We are working to determine the current status of the water quality in the region and will be collecting water samples from the shoreline of the stream and lake. We will be testing the water for fecal indicator bacteria (enterococci, Clostridium perfringens), nutrients (total nitrogen, total phosphorus, nitrate nitrite) chlorophyll a, silicates, turbidity, and total suspended solids. The data will be used to help determine which course(s) of action are best to address the water quality issues in region.

Assessment is the first step in water quality restoration. For restoration to be successful, CWB is seeking the cooperation and participation of all community members and stakeholders. Please attend the local community meetings so your concerns and feedback are heard. Consider participating in events dedicated to improving water quality such as the removal of invasive species and the cultivation of rain gardens.

This webpage will be updated as meeting information and project updates become available.

Any questions can be directed to [email protected]

Mahalo for your assistance in restoring, protecting, and preserving Hawai’i’s treasured water resources.


Turbidity, Sediment and Nutrient TMDL for the Waikele Watershed, Oahu, Hawaii

The TMDLs for the Waikele watershed have formally been accepted by EPA as of May 9, 2019. The following links provide downloads of the TMDL, TMDL Checklist, and TMDL EPA Acceptance letter.



TMDL Technical Reports and Implementation Plans for approved TMDLs

For the DOH Submittal Letter, EPA Approval Letter, and the EPA Review Checklist, please contact Clean Water Branch.