Department of Environmental Conservation

D E C banner

NYS Section 303(d) List of Impaired/TMDL Waters

Data Solicitation for the 2024 Integrated Report on New York State Water Quality

The New York State Department of Environmental Conservation is seeking water quality data and information from the public or entities for any New York State waterbody.

Water quality data and information received may be used to update waterbody assessments in the state's 305(b) Water Quality Report or the Clean Water Act Section 303(d) List of Impaired Waters. Waterbody assessments are conducted following the methodology described in the Consolidated Assessment Listing Methodology (CALM).

Data Requirements:

To be used for assessments, data must:

  • Be accompanied by a Quality Assurance Project Plan (QAPP) and a Data Usability Analysis Report (DUAR),
  • Demonstrate that Data Quality Indicators (DQI's) have been met: precision, accuracy, bias, representativeness (Table 7 of the CALM), completeness, comparability, and sensitivity,
  • Be analyzed by a New York State Department of Health Environmental Laboratory Approval Program accredited Lab (leaves DEC website) in accordance with New York State Public Health Law § 502 and Environmental Conservation Law § 3-0119, and Title 40 of Code of Federal Regulations Part 136 analysis methods are used where applicable, and
  • Be reflective of parameters with a water quality standard or a Supplemental Indicator identified in Tables 1-5 of the CALM.

How to Submit Data:

Email all applicable data, the QAPP or DUAR, and any other relevant information to: If necessary, a hard copy may be mailed to Sarah Rickard, NYSDEC - Division of Water, 625 Broadway, Albany, NY 12233.

When to Submit Data:

To be considered for the 2024 Integrated Report, data and information must be received by September 29, 2023.

Draft 2020-2022 Clean Water Act Section 303(d) List of Impaired Waters

Every two years, the Federal Clean Water Act and supporting federal regulations require states to submit a list of impaired waters that require the development of a Total Maximum Daily Load (TMDL). Waters that require TMDL development because they do not meet applicable water quality standards and do not support applicable best uses are published, along with the identified pollutant(s), as the Section 303(d) List of Impaired Waters.

On December 29, 2021, DEC announced the availability of the Draft 2020-2022 Clean Water Act (CWA) Section 303(d) List of Impaired/Total Maximum Daily Load (TMDL) Waters. The public comment period was originally 30-days, scheduled to end January 28, 2022. A 15-day extension was noticed on January 19, 2022, and scheduled to end February 11, 2022. An additional extension of the public comment period for 14-days was issued and the public comment period closed on February 25, 2022.

Current 303(d) List

The current 303(d) List in effect is the Final 2018 NYS Section 303(d) List (PDF).

Consolidated Assessment and Listing Methodology

For more information about how water quality assessments are conducted, read the New York State Department of Environmental Conservation's Consolidated Assessment and Listing Methodology (CALM, updated May 2023) (PDF).

Previous versions of the CALM have been archived and are available upon request to

  • Find on this Page
  • Important Links
  • PDF Help
  • For help with PDFs on this page, please call 518-402-8179.
  • Contact for this Page
    Division of Water
    625 Broadway
    Albany, NY
  • This Page Covers
  • Page applies to all NYS regions