HomeMy Public PortalAbout2023 water quality report1
Village of Glenview
IL0311020
Annual Water Quality Report
January 1 - December 31, 2023
Introduction
For the period of January 1 thru December 31, 2023, the Village of Glenview Water Supply (PWSID
IL0311020) has met or exceeded all United States Environmental Protection Agency (USEPA) and Illinois
Environmental Protection Agency (IEPA) drinking water standards. This Consumer Confidence Water
Quality Report is required by the IEPA to be published annually. The report summarizes the quality of the
water that was provided this past year, including details about where your water comes from, what it
contains, how it compares to current standards and who to contact if you have questions. Este informe
contiene información muy importante sobre el aqua que usted bebe. Tradúzcalo ó hable con alguien que lo
entienda bien.
Water Source and Delivery System
The Village of Glenview purchases its water from the Village of Wilmette. Wilmette’s treatment plant receives its
raw water from Lake Michigan. The water is treated at the Wilmette Water Plant on the Lake Michigan lakefront. A
4-million-gallon standpipe and a 3-million-gallon underground reservoir and pumping station provide additional
storage of treated water on the west side of Wilmette, and are used to maintain water pressure in their distribution
system as well as to supply a reliable flow of water to the Village of Glenview.
The water plant uses a mixture of chemicals, settling basins, and filters to remove all contaminants to below
regulated levels. Chlorine residuals are maintained throughout the plant and distribution system to prevent the
growth of bacteria. Operators are on duty 24 hours a day year-round to monitor the water system. In addition, the
water plant has an Illinois Department of Public Health (IDPH) certified laboratory for conducting bacteriological
testing.
The Village of Glenview operates five major pumping stations that deliver drinking water to our customers through
a network of pipes which total over 230 miles. Our water system includes a total water storage capacity of 16.3
million gallons, over twice our daily average usage. As added reliability, the Village of Glenview has
interconnections with the Village of Northbrook and Northbrook Township.
Sources of Drinking Water/ Water Contaminants
In order to ensure that tap water is safe to drink, the EPA prescribes regulations that limit the amount of certain
contaminants in water provided by public water systems. FDA regulations establish limits for contami nants in
bottled water, which must provide the same protection for public health.
The sources of drinking water (both tap water and bottled water) include rivers, streams, lakes, ponds, reservoirs,
springs, and 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 human activity.
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Contaminants that may be present in source water include:
• Microbial contaminants, such as viruses and bacteria, which may come from septic systems, sewage
treatment plants, agricultural livestock operations and wildlife.
• Inorganic contaminants, such as salts and metals, which may be naturally-occurring or result from urban
storm water runoff, industrial or domestic wastewater discharges, oil and gas production, mining or farming.
• Pesticide 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 may also come from gas stations, urban storm water
runoff, and septic systems.
• Radioactive contaminants, which may be naturally-occurring or be the result of oil and gas production and
mining activities.
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 USEPA’s Safe Drinking
Water Hotline (1-800-426-4791).
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 advic e about drinking water from their health care
providers. EPA/Center for Disease Control guidelines on appropriate means to lessen the risk of infection by
cryptosporidium and other microbial contaminants are available from the USEPA’s Safe Drinking Water Hotline (1-
800-426-4791).
In addition to the informational section of the Water Quality Report, several tables are included, which provide
detailed information about the contaminants that were detected in the system’s water and some contaminants that
were tested for but not detected.
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2023 Water Quality Data
Regulated Contaminants IL0311020
Disinfectants
and
Disinfection
By-Products
MCLG MCL
Highest
Level
Detected
Range
Detected Violation
Date of
Sample
Likely Source of
Contamination
Chlorine (ppm)
Cl2 MRDLG=4 MRDL=4 1.1 1.0 – 1.2 none 2023 Water additive used
to control microbes
Haloacetic Acids
(HAA5) * (ppb)
No goal for
the total 60 18 9.8 - 21.4 none 2023
By-product of
drinking water
disinfection
Total
Trihalomethanes
(TTHM)* (ppb)
No goal for
the total 80 45 21.01 - 63.9 none 2023
By-product of
drinking water
disinfection
* Not all sample results may have been used for calculating the Highest Level Detected because some results may be
part of an evaluation to determine where compliance sampling should occur in the future.
Lead and Copper Test Results IL0311020
Lead and
Copper
Date
Sampled MCL
G
ACTION
LEVEL
(AL)
90th
Percentile
Sites over
(AL) Violation Likely Source of
Contamination
Lead (ppb) 2023 0 15 3.8 0 none
Corrosion of household
plumbing systems; Erosion of
natural deposits.
Copper
(ppm) 2023 1.3 1.3 0.093 0 none
Erosion of natural deposits;
Leaching from wood
preservatives; Corrosion of
household plumbing systems.
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. The
Village cannot control the variety of materials used in plumbing components. If 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.
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Understanding the Water Quality Data
Definitions and Abbreviations:
Maximum residual disinfectant level goal or MRDLG: The level of a drinking water disinfectant below
which there is no known or expected risk to health.
Maximum residual disinfectant lever or MRDL: The highest level of a disinfectant allowed in drinking
water.
Action Level or AL: The concentration of a contaminant which, if exceeded, triggers treatment or other
requirements which a water system must follow.
MCLG: Maximum Contaminant Level Goal, or the level of a contaminant in drinking water below which there is no known
or expected risk to health. MCLG’s allow for a margin of safety.
MCL: Maximum Contaminant Level, or 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.
ND: -not detectable at testing limits
ppb or ug/L: parts per billion or micrograms per liter; or one ounce in 7,350,000 gallons of water
ppm or mg/L: parts per million or milligrams per liter; or one ounce in 7,350 gallons of water
PWSID: Public water supply identification number.
mrem: Millirems per year (a measure of radiation absorbed by the body)
NTU: Nephelometric Turbidity Units
TT: Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water
In most cases, the “Level Detected” column represents an average of sample result data, collected during the calendar
year. If a date appears in the “Date of Sample” column, the Illinois EPA requires monitoring for this contaminant less than
once a year because the concentrations do not frequently change. If no date appea rs in the column, monitoring for this
contaminant was conducted during the calendar year.
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2023 Village of Wilmette Water Quality Data
Listed below is data supplied by Village of Wilmette. This water analysis information was compiled from samples that
Wilmette is required to take of its water supply system annually, and is required to be included in this report.
IL0313300
Inorganic
Contaminants MCLG MCL
Highest
Level
Detecte
d
Range of
Levels
Detected
Violati
on
Date of
Sample
Likely Source of
Contamination
Nitrate (ppm) 10 10 0.38 Single Sample none 2023
Runoff from fertilizer
use; Leaching from
septic tanks,
sewage; Erosion of
natural deposits
Barium (ppm) 2 2 0.021 Single Sample none 2023 Erosion of natural
deposits
Fluoride (ppm) 4 4.0 0.684 Single Sample none 2023
Erosion of natural
deposits; water
additive which
promotes strong
teeth
Sodium (ppm) NA NA 9.5 Single Sample none 2023 Erosion of natural
deposits
Sulfate (ppm) N/A
USEPA
National
Secondary
Standard of
250
21 Single Sample none 2023
Naturally occurring,
coagulant residual
Turbidity
Limit
(Treatment
Technique)
Level
Detected Violation Date of
Sample Likely Source of Contamination
Highest single
Measurement 1 NTU 0.18
NTU none 2023 Soil Runoff
Lowest
monthly %
meeting limit
0.3 NTU 100% none 2023 Soil Runoff
Information Statement: Turbidity is a measurement of the cloudiness of the water caused by suspended particles.
The Village of Wilmette monitors it because it is a good indicator of water quality and the effectiveness of the Water
Plant’s filtration system and disinfectants.
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Total Organic Carbon
The percentage of Total Organic Carbon (TOC) removal was measured each month and the system met all TOC
removal requirements set.
Additional Information About Your Water
Measured Parameter
Wilmette Average
pH (0-14 pH units) 8.08
Alkalinity (ppm) 109
Hardness (as mg CaCO 3/L) 142
Hardness (as grains per gallon) 8.24
Calcium (ppm) 33
Chloride (ppm) 15
Magnesium (ppm) 11
Aluminum (ppb) 130
Total Dissolved Solids (ppm) 210
Source Water Assessment
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 intakes with no
protection, only dilution, which is the reason for mandatory treatment for all surface water supplies in Illinois. A work
group from the Great Lakes States was organized to develop a protocol for assessing the Great Lakes. The mission
of the Great Lakes Protocol was to develop a consistent procedure allowing the flexibility necessary to properly
conduct source water assessments of the Great Lakes as a drinking water source. This flexibility takes into account
the variability of these sources and site-specific concerns for determination of source sensitivity and susceptibility
(Illinois EPA, 1999). Sensitivity is defined as the intrinsic ability of surface water to be isolated form contaminants by
the physical attributes of the hydrologic or geologic setting. With this in mind, the degree of sensitivity becomes the
prevailing factor in the susceptibility determination for intakes on the Great Lakes. Intakes located close to shore or
close to a major shipping lane will be more sensitive and thus more susceptible to potential contamina tion. The
sensitivity analysis of both Wilmette’s intakes show that they are located far enough offshore that shoreline impacts
are not considered a factor on water quality. However, at certain times of the year the potential for contamination
exists due to wet-weather flows from the North Shore Channel. If currents are flowing in a northerly direction,
contaminants from these flows could migrate to Wilmette’s intakes and compromise water quality. Correlation
between Evanston’s rainfall data, North Shore Channel discharge dates and Wilmette’s coliform data show the
potential effect of these flows on Wilmette’s water quality. In addition, the proximity to a major shipping lane adds to
the susceptibility should there be a spill near the intakes .
The Village of Glenview wants its valued customers to be informed about water quality. You are invited to
participate in the decision-making processes that affect drinking water quality. Please feel welcome to
attend any of the Village’s regularly scheduled Village Board of Trustee meetings which are held at 7:30 p.m.
on the first and third Tuesdays of the month at Village Hall, 2500 East Lake Avenue. Check the Calendar on
the Village of Glenview website for more meeting information. To view a summary version of th e completed
Source Water Assessments, including: Importance of Source Water; Susceptibility of Contamination
Determination; and documentation/recommendation of Source Water Protection Efforts, you may access the
Illinois EPA website at http://dataservices.epa.illinois.gov/swap/factsheet.aspx.
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If you have any questions concerning this report or your water system, please contact Dave Battaglia,
Superintendent of Public Works at (847)904-4522. This report is available on the internet at the Glenview web site,
www.glenview.il.us/2023waterqualityreport. Printed copies are available at the Customer Service counter at
Village Hall, 2500 E. Lake Ave., Glenview, IL 60026
.Did You Know?
Glenview has been purchasing water from the Village of Wilmette since 1938. In fact, about 70 percent
of the water Wilmette pumps and treats comes into Glenview.
On average, a Glenview resident uses 85 gallons of water per person each day.
The water supply is monitored 24 hours a day by both Wilmette and Glenview.
Both Glenview and Wilmette constantly test water samples for biological and chemical contaminants.
Wilmette has a laboratory on site at its water plant where full-time staff members routinely do “spot
checks” of raw and treated water, and Glenview tests a minimum of 50 water samples each month for
total coliform and E.coli.
The Village is prepared for emergencies! The Village of Glenview has agreements and underground
connections with both the Village of Northbrook and the Village of Northfield for emergency
supplies of water, should we need them. Wilmette has back-up power at its water plant, and the Rugen
Road and West Lake reservoir/pumping stations have two sources of power. All of Glenview’s major
pumping stations also have emergency back-up generators.
Is it advisable to use water from the hot water tap for drinking, cooking or making baby formula?
No. Hot water generally comes from a hot water heater that may contain impurities that should not be
ingested. Some of these impurities might be metals from household plumbing that are dissolved and
concentrated in the heating process.
Why does water sometimes have a musty taste and odor?
During the summer months, residents may notice a slight “musty” or “earthy” taste and odor in the water.
The chemicals that cause this are naturally occurring but harmless in the concentrations found in
Wilmette’s/Glenview’s drinking water. Wilmette adds activated carbon to the water to help remove these
odors. Keeping an open container of water in the refrigerator allow the odors to dissipate and improves
the taste of the water.
Why does the water coming out of the faucet sometimes look milky or opaque?
This generally occurs in cold weather, when water entering the house is colder than the temperature
inside. Cold water holds more oxygen than warm water. As the cold water warms, the oxygen escapes in
tiny air bubbles that make the water look “milky.”
What is the hardness of the water?
The tap water has a hardness of 142mg/L, or about 8.31 grains.
Is bottled water safer than tap water? Not necessarily. Studies have shown that microbes can grow in
bottles while on the grocers’ shelves. Residents do not need to buy bottled water for safety reasons since
Glenview’s tap water meets all federal and state drinking water standards. Those who prefer water with a
different taste can buy bottled water, but it costs up to 1,000 times more than tap water. Of course, in
emergencies, bottled water can be a vital source of drinking water for people without water.
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