For Consideration in Preparing the 2020/2022 Combined Integrated Report on Illinois Water Quality, including the List of Clean Water Act Section 303(d) Impaired Waters


The Illinois Environmental Protection Agency solicits all applicable surface-water data (biological, chemical, and physical) and information to help identify:

  • Waters attaining all designated uses (e.g., Aquatic Life Use, Primary Contact Use, Aesthetic Quality Use, Fish Consumption Use);
  • Waters not attaining one or more designated uses (collectively called "impaired waters"); and
  • Potential causes of impairment (e.g., excessive pollutant concentrations, habitat alteration).

We will accept surface-water-quality data or other information regardless of whether it suggests that the waterbody is attaining designated uses or not. We will consider the submitted data and information when preparing the 2020/2022 Integrated Report (due April 1, 2022) as required by Sections 305(b) and 303(d) of the federal Clean Water Act (CWA). Section 305(b) of the CWA requires each state to monitor, assess, and prepare a water-quality inventory of its surface waters every two years. Section 303(d) of the CWA requires each state to prepare a list of impaired surface waters for which comprehensive water-quality studies (i.e., Total Maximum Daily Load studies) must be prepared to help guide restoration and other management efforts. This list, commonly called the "303(d) List," represents only a subset of impaired waters.

What and When To Submit

We will accept data packages through April 15, 2021. Data packages submitted after this date will be considered in the preparation of similar reports after the 2020/2022 report.
We require submitted data and information for consideration in preparing the 2020/2022 Integrated Report be obtained using a documented quality assurance (QA) and quality control (QC) program.  This ensures that all environmentally‐related data operations performed will result in data that are of known and documented quality and can be used with a reasonable degree of certainty to support specific decisions or actions.

Submitted data packages must include:

     1. Quality Assurance Project Plan

  • Must be prepared according to the U.S. Environmental Protection Agency's document EPA QA/R‐5, EPA Requirements for Quality Assurance Project Plans (March 2001, reissued May 2006), available at USEPA website
  • Must be approved by both the submitting entity’s project manager and quality assurance officer.
  • Must contain all environmental sampling, analysis, and quality-control procedures that were used to obtain the data and information.
  • Must contain the analytical test methods used to prepare and analyze the environmental samples. Analytical test methods must comply with Title 40 Code of Federal Regulations Part 136, “Guidelines for Establishing Test Procedures for Analysis under the Clean Water Act” or the latest edition of Standard Methods for the Examination of Water and Wastewater.
  • Must contain the analytical laboratory’s name and location. The laboratory must be a state-certified laboratory or hold National Environmental Laboratory Accreditation Program accreditation for the analyses performed.

    2. Electronic file of data and information

  • Must be configured and formatted—preferably as Microsoft Excel spreadsheets—according to the Data Submission Template.
  • Must include all data from January 2015 through December 2019 in one worksheet. Even if some data (e.g., from 2014 and 2015) were submitted for the previous Integrated Report, it must also be included with this submission.

     3. Data-Quality Summary

  • Must include a summary that describes and aids interpretation of the submitted data and information.
  • Must include a description of any deviations from the Quality Assurance Project Plan or other problems with sample collection or analytical processes that could affect data quality.

How To Send Data Packages

E-mail files to Michelle Rousey or mail to Michelle Rousey, Quality Assurance Officer, Illinois Environmental Protection Agency, Bureau of Water, P.O. Box 19276, Springfield, Illinois, 62794-9276.


For questions regarding this guidance document, please contact Michelle Rousey, Bureau of Water Quality Assurance Officer, or Gregg Good, Manager, Surface Water Section, Bureau of Water at (217) 782-3362.