Annual Drinking Water Quality Report for Calendar Year 2024 	IL0310690

	
This report is intended to provide you with important information about your drinking water and the efforts made by the water system to provide safe drinking water.  This report includes drinking water facts, information on violations (if applicable), and contaminants detected in your drinking water supply during calendar year 2024.  Each year, we will provide you a new report.  If you need help understanding this report or have general questions, please contact the person listed below.
	
Este informe contiene información muy importante sobre el agua que usted bebe. Tradúzcalo ó hable con alguien que lo entienda bien.	Contact Name:	Darryl Bunch	
	Telephone Number:	 708-201-3280	
	E-mail (if available)	dbunch@vodolton.org	
	
Sources of Drinking Water
The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and groundwater wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity. 
Our source of water comes from the City of Chicago Purchased Surface Water. 
Contaminants that may be present in source water include:
•	Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.
•	Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban storm water runoff, industrial, or domestic wastewater discharges, oil and gas production, mining, or farming.
•	Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban storm water runoff, and residential uses.
•	Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems.
•	Radioactive contaminants, which can be naturally-occurring or be the result of oil and gas production and mining activities.

Other Facts about Drinking Water
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the EPA's Safe Drinking Water Hotline at (800) 426-4791.
In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled water which must provide the same protection for public health.

Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791).

Source Water Assessments
Source water protection (SWP) is a proactive approach to protecting our critical sources of public water supply and assuring that the best source of water is being utilized to serve the public. It involves implementation of pollution prevention practices to protect the water quality in a watershed or wellhead protection area serving a public water supply. Along with treatment, it establishes a multi-barrier approach to assuring clean and safe drinking water to the citizens of Illinois.  The Illinois EPA has implemented a source water assessment program (SWAP) to assist with wellhead and watershed protection of public drinking water supplies.

We want our valued customers to be informed about their water quality.  If you would like to learn more, please feel welcome to attend any of our Village Board Meetings which are held twice a month – 1st and 3rd Monday at 6:30 p.m.,  at the Dolton Village Hall, 14122 Martin Luther King Jr. Drive, Dolton, IL .  The source water assessment for our supply has been completed by the Illinois EPA.  If you would like a copy of this information, please stop by City Hall or call our water operator at (708) 849-4000To view a summary version of the completed Source Water Assessments, including Importance of Source Water; Susceptibility to Contamination Determination; and documentation/recommendation of Source Water Protection Efforts, you may access the Illinois EPA website at http://www.epa.state.il.us/cgi-bin/wp/swap-fact-sheets.pl.

Source of Water: Chicago in Illinois EPA considers all surface water sources of public water supply susceptible to potential pollution problems. Hence the reason for mandatory treatment of all public water supplies in Illinois. Mandatory treatment includes coagulation, sedimentation, filtration and disinfection. Primary sources of pollution in Illinois lakes can include agricultural runoff, land disposal (septic systems) and shoreline erosion.

2023 Regulated Contaminants Detected
The next several tables summarize contaminants detected in your drinking water suppl: Since water is purchased from City of Chicago, results indicated with an asterisk (*) were provided to us by them.

Here are a few definitions and scientific terms which will help you understand the information in the contaminant detection tables.  
AL	Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.	
Avg	Regulatory compliance with some MCLs is based on running annual average of monthly samples.	
MCL	Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the Maximum Contaminant Level Goal as feasible using the best available treatment technology.	
MCLG	Maximum Contaminant Level Goal: The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.	
MRDL	Maximum Residual Disinfectant Level: The highest level of disinfectant allowed in drinking water.	
MRDLG	Maximum Residual Disinfectant Level Goal: The level of disinfectant in drinking water below which there is no known or expected risk to health. MRDLGs allow for a margin of safety.	
N/A	Not Applicable	
NTU	Nephelometric Turbidity Units	
pCi/L	picocuries per liter ( a measure of radioactivity)	
ppb	Parts per billion or micrograms per liter (ug/L) - or one ounce in 7,350,000 gallons of water.	
ppm	Parts per million or milligrams per liter (mg/L) - or one ounce in 7,350 gallons of water.	
TT	Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.	

Lead and Copper		
	Date Sampled	MCLG	Action Level (AL)	90th Percentile	# Sites Over AL	Units	Violation	Likely Source of Contamination	
Copper	8/30/2023	1.3	1.3	0.0201	0	ppm	NO	Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives	
Lead	8/30/2023	0	15	     2.13	0
	ppb	NO	Corrosion of household plumbing systems; erosion of natural deposits.	
Lead and Copper

Definitions:  
Action Level:  The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Action Level Goal (ALG):  The level of a contaminant in drinking water below which there is no known or expected risk to health.  ALGs allow for a margin of safety.
  
Copper Range:  50.2 ug/L to 0.0 ug/L
Lead Range:      9.6  ug/L to 0.0 ug/L 
To obtain a copy of the system's lead tap sampling data contact: Darryl Bunch (708) 201-3280

Our Community Water Supply has developed a service line material inventory.
To obtain a copy of the system's service line inventory contact:  Darryl Bunch (708) 201-3280

If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children.  Lead in drinking water is primarily from materials and components associated with service lines and home plumbing.  Village of Dolton is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components.  When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking.  If you are concerned about lead in your water, you may wish to have your water tested.  Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/safewater/lead.	

Disinfectants & Disinfection Byproducts	
Collection Date	
Highest Level Detected	
Range of Levels Detected	
MCLG	
MCL	
Units	
Violation	
Likely Source of Contamination	

Chlorine

2024	

1.0	

0.9-1.1	

4	

4	

ppm	

NO	
Water additive used to control microbes.

Haloacetic Acids (HAA5)

2024	

16	

10.22-22.0	

60	
No Goal for the total 	

ppb	

NO	
By-product of drinking water disinfection.

Total Trihalomethanes (TTHM)

2024	

22	

15.09-56.0

80	
No Goal for the total	

ppb	

NO	
By-product of drinking water disinfection.

	

Violation Summary Table
The following table(s) lists all violations that occurred during 2023.  We included a brief summary of the actions we took following notification of the violation.

	Violation Type	Violation Duration
Start Date – End date	Violation Explanation	

CCR ADEQUACY/AVAILABILITY/CONTENT

	Start Date
7/1/2023
End date
9/19/2024
	We failed to provide to you, our drinking water customers, an annual report that adequately informed you about the quality of our drinking water and the risks from exposure to contaminants detected in our drinking water.

CCR REPORT
	Start Date
7/1/2023
End date
9/19/2024
	We failed to adequately notify you, our drinking water consumers, about a violation of the drinking water regulations.

	
PUBLIC NOTICE RULE LINKED TO VIOLATION
	
StartDate: 11/05/2023
End Date: 2024

	We failed to adequately notify you, our drinking water consumers, about a violation of the drinking water regulations.
	
2024 Water Quality Data
DATA TABULATED BY CHICAGO DEPARTMENT OF WATER MANAGEMENT
0316000 CHICAGO

Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected risk to health.  MCLGs allow for a margin of safety.
Maximum Contaminant Level (MCL): The highest level of a contaminant that is allowed in drinking water.  MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Highest Level Detected:  This column represents the highest single sample reading of a contaminant of all the samples collected in 2024.
Range of Detections: This column represents a range of individual sample results, from lowest to highest that were collected during the CCR calendar year.
Date of Sample: If a date appears in this column, the Illinois EPA requires monitoring for this contaminant less than once per year because the concentrations do not frequently change.  If no date appears in the column, monitoring for this contaminant was conducted during the Consumer Confidence Report calendar year.
Treatment Technique (TT): A required process intended to reduce the level of a contaminant in drinking water.
N/A:	Not applicable

DETECTED CONTAMINANTS
Contaminant (unit of measurement)
Typical source of Contaminant	MCLG	MCL	Highest Level Detected	Range of Detections	Violation	Date of Sample	
Turbidity Data	
Turbidity (NTU/Lowest Monthly % ≤0.3 NTU)
Soil runoff	N/A	TT (Limit: 95%≤0.3 NTU)	Lowest Monthly %: 99.7%	99.7% - 100%			
Turbidity (NTU/Highest Single Measurement)
Soil runoff	N/A	TT (Limit 1 NTU)	0.39	N/A			
Inorganic Contaminants	
Barium (ppm)
Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits	2	2	0.0203	0.0198 – 0.0203			
Nitrate (as Nitrogen) (ppm)
Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits	10	10	0.39	0.36 – 0.39			
Total Nitrate & Nitrite (as Nitrogen) (ppm)
Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits	10	10	0.39	0.36 – 0.39			
Total Organic Carbon (TOC)	
TOC 	The percentage of TOC removal was measured each month and the system met all TOC removal requirements set by IEPA.	
Unregulated Contaminants	
Sulfate (ppm)
Erosion of naturally occurring deposits	N/A	N/A	28.2	25.3 – 28.2			
Sodium (ppm)
Erosion of naturally occurring deposits; Used as water softener	N/A	N/A	9.18	8.87 – 9.18			
State Regulated Contaminants	
Fluoride (ppm)
Water additive which promotes strong teeth	4	4	0.76	0.67 – 0.76			
Radioactive Contaminants	
Combined Radium (226/228) (pCi/L)
Decay of natural and man-made deposits.	0	5	0.95	0.83 – 0.95		02-04-2020	
Gross Alpha excluding radon and uranium (pCi/L)
Decay of natural and man-made deposits.	0	15	3.1	2.8 – 3.1		02-04-2020	

Fifth Unregulated Contaminant Monitoring Rule (UCMR 5)
As required by UCMR 5, EPA’s latest monitoring cycle, the City of Chicago has completed monitoring for 25 perfluorinated & polyfluorinated alkyl substances, 4 perfluorinated alkyl acids, and lithium in its drinking water for four quarters in 2024. None of the contaminants were detected in our drinking water.

Units of Measurement
ppm: Parts per million, or milligrams per liter
ppb: Parts per billion, or micrograms per liter
NTU: Nephelometric Turbidity Unit, used to measure cloudiness in drinking water
%≤0.3 NTU: Percent of samples less than or equal to 0.3 NTU
pCi/L: Picocuries per liter, used to measure radioactivity
TURBIDITY
Turbidity is a measure of the cloudiness of the water.  We monitor it because it is a good indicator of water quality and the effectiveness of our filtration system and disinfectants.
UNREGULATED CONTAMINANTS
A maximum contaminant level (MCL) for this contaminant has not been established by either state or federal regulations, nor has mandatory health effects language.  The purpose for monitoring this contaminant is to assist USEPA in determining the occurrence of unregulated contaminants in drinking water, and whether future regulation is warranted.
FLUORIDE
Fluoride is added to the water supply to help promote strong teeth. The Illinois Department of Public Health recommends an optimal fluoride level of 0.7 mg/L with a range of 0.6 mg/L to 0.8 mg/L.
SODIUM
There is no state or federal MCL for sodium.  Monitoring is required to provide information to consumers and health officials who have concerns about sodium intake due to dietary precautions.  If you are on a sodium-restricted diet, you should consult a physician about the level of sodium in the water.

SOURCE WATER ASSESSMENT SUMMARY 

Source Water Location
The City of Chicago utilizes Lake Michigan as its source water via two water treatment plants.  The Jardine Water Purification Plant serves the northern areas of the City and suburbs, while the Sawyer Water Purification Plant serves the southern areas of the City and suburbs.  Lake Michigan is the only Great Lake that is entirely contained within the United States.  It borders Illinois, Indiana, Michigan, and Wisconsin, and is the second largest Great lake by volume with 1,180 cubic miles of water and third largest by area.

Source Water Assessment Summary
The Illinois EPA implemented a Source Water Assessment Program (SWAP) to assist with watershed protection of public drinking water supplies. The SWAP inventories potential sources of contamination and determined the susceptibility of the source water to contamination. The Illinois EPA has completed the Source Water Assessment Program for our supply. 

Susceptibility to Contamination
The Illinois EPA considers all surface water sources of community water supply to be susceptible to potential pollution problems.  The very nature of surface water allows contaminants to migrate into the intake with no protection, only dilution.  This is the reason for mandatory treatment of all surface water supplies in Illinois.  Chicago’s offshore intakes are located at a distance where shoreline impacts are not usually considered a factor on water quality.  At certain times of the year, however, the potential for contamination exists due to wet-weather flows and river reversals.  In addition, the placement of the crib structures may serve to attract waterfowl, gulls and terns that frequent the Great Lakes area, thereby concentrating fecal deposits at the intake and thus compromising the source water quality.  Conversely, the shore intakes are highly susceptible to storm water runoff, marinas and shoreline point sources due to the influx of groundwater to the lake.  

Further information on our community water supply’s Source Water Assessment Program is available by calling DWM at 312-742-2406 or by going online at http://dataservices.epa.illinois.gov/swap/factsheet.aspx

2024 VOLUNTARY MONITORING

The City of Chicago has continued monitoring for Cryptosporidium, Giardia and E. coli in its source water as part of its water quality program. No Cryptosporidium or Giardia was detected in source water samples collected in 2024. Treatment processes have been optimized to provide effective barriers for removal of Cryptosporidium oocysts and Giardia cysts in the source water, effectively removing these organisms in the treatment process.  By maintaining low turbidity through the removal of particles from the water, the possibility of Cryptosporidium and Giardia organisms getting into the drinking water system is greatly reduced. 

In 2024, CDWM has also continued monitoring for hexavalent chromium, also known as chromium-6. USEPA has not yet established a standard for chromium-6, a contaminant of concern which has both natural and industrial sources. Please address any questions or concerns to DWM’s Water Quality Division at 312-744-8190.  Data reports on the monitoring program for chromium-6 are posted on the City’s website which can be accessed at the following address below:  
http://www.cityofchicago.org/city/en/depts/water/supp_info/water_quality_resultsandreports/city_of_chicago_emergincontaminantstudy.html

                                                                          For more information, please contact
Patrick Schwer
At 312-744-8190

Chicago Department of Water Management
1000 East Ohio Street
Chicago, IL 60611

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

This notice is being sent to you by:
The City of Chicago
Department of Water Management
Water System ID# IL0316000