Want to learn more about DuPage County?

Sign up for County newsletters and email updates!


Water Division

Water Quality Complaints


Water Division Overview

DuPage County's Water Division owns and operates six water systems within unincorporated areas including:

  • Southeast Regional Water System, in Darien
  • Greene Road/Hobson Valley Water System, in Woodridge
  • Steeple Run Water System, in Lisle
  • Glen Ellyn Heights Water System, in Glen Ellyn
  • North Regional Water Facility, in Itasca
  • York Township Water System, in Lombard

Together a combined population of about 14,000 people are served , distributing just over 400 million gallons of water a year through approximately 75 miles of pipe.  With the exception of the North Regional Water Facility, all systems distribute Lake Michigan water.

The North Regional Water Facility processes well water through a nanofiltration treatment system employing selective membrane based cross-flow filtration for the removal of contaminants responsible for water hardness and discoloration. Customers receive a purified water with a hardness value of three to five grains per gallon.

All County Water Division systems comply with Illinois Environmental Protection Agency (IEPA) regulatory policies including regular bacteriological and contaminant testing of standby wells and distribution points in accordance with IEPA guidelines.

It is the goal of the DuPage County Water Division to constantly improve customer water quality and service. If you have questions, concerns or would like further information about any of our water systems, please contact us at 630-964-7503.

For unincorporated DuPage County communities we may be able to assist you with providing a safe drinking water supply based upon your location, nearby water sources, raw water characteristics and the availability of capital funding. Please contact our Regulatory Manager to discuss the possibilities of setting up a Special Service Area at 630-407-6679.

Consumer Confidence Reports

The EPA requires the Public Works Department provide our customers information about the quality of their local drinking water through a Consumer Confidence Report (CCR). The CCR identifies the source of drinking water, provides a brief summary of the potential risk of contamination, identify any contaminants were found and the health effects of the contaminants as well as the system’s actions to restore safe drinking water.  It is also an educational tool to make consumers aware of the vulnerability of the population and provide various facts on pollutants and contaminants of concern.

Please visit the respective system link at the end of this page to view your water quality report. If needed, use the “six water systems” link above to determine your water system. To speak to someone about the details of the water reports, or if you would like a paper copy of the report mailed to your home please call (630)-964-7503.

Re-Opening of Buildings to Avoid Water Stagnation

Federal and State agencies have provided guidance for "re-opening" of buildings, identifying best practices and approaches to ensure proper addressing of potential water quality issues that may arise from water stagnation. We encourage owners of buildings and businesses anticipating reopening to follow these Federal and State guidelines outlined below. In conjunction, DuPage County Public Works will make the necessary efforts to work closely with businesses and individuals to ensure water quality standards are continuing to be met.

Hydrant Flushing


Signs will be posted in the area before the start of hydrant flushing. Residents are urged not to do laundry during periods of flushing in your area to avoid staining of clothing, which may occur due to dislodging of sediments in the water main. Always review and follow the recommended best practices procedures for flushing your water lines after these activities.

Please call us for further information or with any water quality complaints at 630-964-7503.

Watering Restriction Guidelines

The following restrictions shall be in effect all DuPage County Water Systems from May 15 through September 15 as follows:

Water shall not be used on any day between the hours of 10:00 A.M. and 7:00 P.M. for the purpose of:

  • Watering or sprinkling gardens, lawns, trees, shrubs and other outdoor plants, except that such restrictions shall not prohibit the watering of newly planted gardens, lawns, trees, shrubs and plants with hand held water devices;
  • Filling swimming pools; and
  • Washing vehicles, houses, trailers, driveways and sidewalks.

Outside watering will be allowed before 10:00 A.M. or after 7:00 P.M., as determined by street number and day of the month (odd/even sequence).  Odd street addresses may water on the odd days of the month and even street addresses may water on the even days of the month.

Cross-Connection Control Program

To protect the integrity of our drinking water supply and for your health and safety, a Cross-Connection Control Program (CCCP) is included in the DuPage County Water Supply, Distribution and Wastewater Treatment Ordinance and provides the following:

  • Authority to require certain backflow prevention devices within any residential or commercial property that is connected to the County water supply;
  • Promotion of compliance with public water supply safety regulations in the Federal Safe Drinking Water Act, the Illinois Environmental Protection Agency’s Regulation Title 35, and the Illinois Plumbing Code, and;
  • Protection of the public drinking water supply from backflow contamination through cross-connections.

A cross-connection is any piping arrangement (actual or potential) between the drinking water supply and any other water source, which under certain conditions, may result in backflow contamination into the drinking water supply. Examples of cross-connection hazards include underground sprinkler irrigation systems, fire protection systems, pools and hot tubs, and industrial ice machines, among others.   

The Illinois Environmental Protection Agency (IEPA) requires that we conduct a biannual All Drinking Water System Connection Survey. This survey is an integral part of the program, in which we rely on our water customers to provide accurate information regarding the hazards present at the property. As a result, a survey has been prepared to assess risk and compile backflow prevention device data for properties serviced by DuPage County Public Works. Customers have the choice of filling out the electronic survey (E-Survey) or filling out the PDF and submitting the survey to our department manually. This program is intended to protect all drinking water customers, and your active participation is required. 

If you have questions or require additional information, please contact the CCCP manager directly at 630-207-6400

For testing companies filing reports, please send a copy via email to rpzdata@dupagecounty.gov.

Information about Lead

Doc app

Document Center

The Document Center provides easy access to public documents. Click on one of the categories below to see related documents or use the search function.

Categories always sorted by header (sub-categories sorted by sequence within each category)
Documents sorted by SEQ in Ascending Order within category

CCCP Links (Cross Connection Control Program)4 documents

  • Learn More About the Cross-Connection Control Program
    document seq 0.00
  • ISAWWA - Illinois Backflow & Cross-Connection Information
    document seq 0.00
  • Certified Cross-Connection Control Device Companies
    document seq 0.00
  • Cross-Connection Control Program Survey
    document seq 0.00

System Consumer Confidence Reports6 documents

  • 2022 SERWF (Darien Area)
    document seq 0.00
  • 2022 Greene Road - Hobson Valley
    document seq 0.00
  • 2022 Glen Ellyn Heights 
    document seq 0.00
  • 2022 North Regional Water Facility (Nordic Park)
    document seq 0.00
  • 2022 Steeple Run
    document seq 0.00
  • 2022 York Township
    document seq 0.00
Sign Up