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Consumers Annual Report on Water Quality
 2007 Consumers
Annual Report on Water Quality (49K)
The
City of Novi is pleased to present the 2007 Annual Drinking Water
Quality Report. This report contains mandatory information about
water quality issues and potential health effects, lists the source
of our water and provides the results of the water quality
monitoring tests for 2007. The treatment and monitoring, of our
drinking water, complies with all mandatory Federal and State
Drinking Water Regulations. If the water quality is compromised we
will notify our customers immediately.
Title XIV of the United States Public Health Service Act (Chapter
373, 88 Stat. 1660), commonly known as The Safe Drinking Water Act,
and the Michigan Safe Drinking Water Act (1976 PA 399 as amended to
1998 PA 56) require a supplier of water to provide annual Consumer
Confidence Reports (CCR) to its customers.
CONTAMINANTS AND THEIR PRESENCE IN 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 Environmental Protection
Agency’s Safe Drinking Water Hotline (800-426-4791).
SOURCES OF DRINKING WATER: The sources of drinking water
(both tap water and bottled water) include rivers, lakes, streams,
ponds, reservoirs, springs, and wells. Our water comes from Lake
Huron and/or the Detroit River, as appropriate. 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.
SOURCE WATER ASSESSMENT: The City of Novi source water
comes from the lower Lake Huron watershed. The watershed includes
numerous short, seasonal streams that drain to Lake Huron. The
Michigan Department of Environmental Quality in partnership with the
U.S. Geological Survey, the Detroit Water and Sewerage Department,
and the Michigan Public Health Institute performed a source water
assessment to determine the susceptibility of potential
contamination. The susceptibility rating is a seven-tiered scale
ranging from moderately low to very high based primarily on geologic
sensitivity, water chemistry, and contaminant sources. The Lake
Huron source water intake is categorized as having a moderately low
susceptibility to potential contaminant sources. The Lake Huron
water treatment plant has historically provided satisfactory
treatment of this source water to meet drinking water standards. If
you would like to know more about this report or a complete copy of
this report, please contact Tim Sikma, Water & Sewer Manager,
248-735-5647 or
via email.
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 stormwater 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 stormwater runoff, and
residential uses.
Organic chemical contaminates, including synthetic and
volatile organics, which are by-products of industrial processes and
petroleum production, and can also come from gas stations, urban
stormwater runoff, and septic systems.
Radioactive contaminants, which can be naturally occurring
or be the result of oil and gas production and mining activities.
In order to ensure that tap water is safe to drink, the
Environmental Protection Agency (EPA) prescribes regulations which
limit the amount of certain contaminates in water provided by public
water systems. The Food and Drug Administration (FDA) regulations
establish limits for contaminants in bottled water, which must
provide the same protection for public health.
tsikma Some people may be more vulnerable to contaminates in
drinking water than is 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. The
Environmental Protection Agency (EPA)/Center For Disease Control
(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).
GENERAL INFORMATION ABOUT OUR WATER DISTRIBUTION SYSTEM:
The City of Novi purchases treated water from the Detroit Water
and Sewerage Department (DWSD) who provides drinking water to
approximately 4.2 million people in 126 southeastern Michigan
communities. The system uses water drawn from two intakes in the
Detroit River; one to the north near the mouth of Lake St. Clair and
one to the south near Lake Erie. The water is directed to four (4)
large water treatment plants for processing. A fifth water treatment
plant located in St. Clair County uses surface water from Lake
Huron. The majority of the water supplied to the City of Novi comes
from the DWSD Lake Huron Water Treatment Plant which is located
north of Port Huron, Michigan at the lower end of Lake Huron. The
DWSD treatment facilities operate 24 hours a day, seven days a week.
Chlorine is used for disinfecting the source water and Fluoride is
added to the treated water for the dental care benefits.
In 2007 we purchased 2,541,888,200 gallons of treated water from
DWSD. The City of Novi currently has more than 12,538 customers on
our Water Distribution System. In our current Capital Improvement
Program (CIP) we have identified construction projects valued in
excess of $10,000,000 for potential construction in the next five to
six years.
MONITORING AND REPORTING REQUIREMENTS:
The State and EPA require us to test our water on a regular basis
to ensure its safety. We met all the monitoring and reporting
requirements for 2007.
We will update this report annually and keep you informed of any
problems that may occur throughout the year, as they happen. Copies
of this report are mailed to all 12,400 water account customers, as
enclosures in their regular quarterly water and sewer bills (April,
May, or June). Additional copies are provided to all multi-family
complexes for internal distribution. Copies are also available at
the Novi Civic Center, 45175 West Ten Mile Road and the Novi Public
Library, 45245 West Ten Mile Road.
We invite public participation in decisions that affect drinking
water quality. City Council meetings are held twice a month on
Monday nights at 7:00 pm in the Council Chambers located in the Novi
Civic Center, 45175 W Ten Mile Rd., Novi, MI 48375. Contact the City
Clerk's office at 248-347-0456 for specific dates. For more
information about your water, or the contents of this report
contact: Tim Sikma, Water & Sewer Manager, 248-735-5647 or
via email.
For more information about safe drinking water,
visit the
United States Environmental Protection Agency (US EPA) website.
DETECTED CONTAMINATION TABLES:
The tables and information contained on the next pages are based
on tests conducted by DWSD and the City of Novi in the year 2005 &
2007. DWSD conducts many tests throughout the year, however, only
tests that show the presence of a contaminant are shown. The State
allows us to monitor for certain contaminants less than once per
year because the concentrations of these contaminants are not
expected to vary significantly from year to year. All of the data is
representative of the water quality, but some are more than one year
old.
Lake Huron Water Treatment Plant
2007 Regulated Detected Contaminants Tables
|
Contaminant |
Test Date |
Units |
Health Goal MCLG |
Allowed Level MCL |
Level Detected |
Range of Detection |
Violation yes/no |
Major Sources in
Drinking Water |
| Inorganic
Chemicals – Annual Monitoring at Plant Finished Water Tap |
Fluoride
|
8/08/07
|
ppm
|
4
|
4
|
1.23
|
n/a
|
No
|
Erosion of natural deposits; Water additive, which promotes
strong teeth; Discharge from fertilizer and aluminum factories.
|
Nitrate
|
8/08/07
|
ppm
|
10
|
10
|
0.28
|
n/a
|
No
|
Runoff from fertilizer use; Leaching from septic tanks,
sewage; Erosion of natural deposits
|
| Disinfectant
Residuals and Disinfection By-Products – Monitoring in
Distribution System |
Total Trihalomethanes (TTHM)
|
Feb-Nov 2007
|
ppb
|
n/a
|
80
|
17.4
|
9.3-40.3
|
No
|
By-product of drinking water chlorination
|
Haloacetic Acids (HAA5)
|
Feb-Nov 2007
|
ppb
|
n/a
|
60
|
11.0
|
2.6-15.2
|
No
|
By-product of drinking water disinfection
|
Disinfectant (chlorine) Residual (ppm)
|
Jan-Dec 2007
|
ppm
|
MRDGL 4
|
MRDL
4
|
0.70
|
0.56-0.83
|
No
|
Water additive used to control microbes
|
| 2007 Turbidity –
Monitored every 4 hours at Plant Finished Water Tap |
|
Highest Single Measurement Cannot exceed 1
NTU |
Lowest Monthly % of Samples Meeting
Turbidity Limit of 0.3 NTU (minimum 95%) |
Violation
yes/no |
Major Sources in Drinking Water |
0.11 NTU
|
100%
|
No
|
Soil Runoff
|
Turbidity is a measure of the cloudiness of water. We
monitor it because it is a good indicator of the effectiveness
of our filtration system.
|
|
Regulated Contaminant |
Treatment Technique |
Running Annual Average |
Monthly Ratio Range |
Violation
Yes/No |
Typical Source of Contaminant |
Total Organic Carbon (ppm)
|
The Total Organic Carbon (TOC) removal ratio is calculated
as the ratio between the actual TOC removal and the TOC removal
requirements. The TOC was measured each month and because the
level was low, there is no requirement for TOC removal.
|
Erosion of natural deposits
|
2007 Special Monitoring
|
Contaminant |
MCLG |
MCL |
Level Detected |
Source of Contamination |
Sodium (ppm)
|
n/a
|
n/a
|
4.81
|
Erosion of natural deposits
|
Unregulated contaminants are those for which EPA has not
established drinking water standards. Monitoring helps EPA to
determine where certain contaminants occur and whether it needs to
regulate those contaminants.
|
City of Novi 2007 Microbiological Contaminants
– Monthly Monitoring in Distribution System |
|
Contaminant |
MCLG |
MCL |
Highest Number Detected |
Violation
yes/no |
Major Sources in Drinking
Water |
Total Coliform Bacteria
|
0
|
Presence of Coliform bacteria > 5% of monthly samples
|
in one Month
0
|
No
|
Naturally present in the environment.
|
E.coli or fecal coliform bacteria
|
0
|
A routine sample and a repeat sample are total coliform
positive, and one is also fecal or E.coli positive.
|
entire year
0
|
No
|
Human waste and animal fecal waste.
|
In 1992 we began testing homes with plumbing systems which may
contribute lead and copper to the household water supply. The
results of lead and copper testing have all been below the EPA
prescribed action levels. Additional information is available from
the Safe Drinking Water Hotline (800) 426-4791.
| Treatment
Technique |
|
Regulated
Contaminant |
MCL |
Treatment Technique
(TT) Standard |
Treatment Technique (TT)
Violation
yes/no |
Reason for violation |
Action Taken |
Major Sources in Drinking Water |
Health Effects |
Lead
|
TT
|
No more than (9) days in a six (6) month
period below the established minimum.
|
Yes
|
During a 14-day period in January and February, phosphate
pump malfunctions resulted in below optimal dosages. Phosphate
was added to the water, but at a dosage below the state
designated minimum. Despite this lower than acceptable dosage,
phosphate residual concentrations in water leaving the plant and
entering the distribution system were maintained above the
established minimum.
|
The chemical feed pumps have all been repaired.
|
Corrosion of household plumbing system; Erosion of natural
deposits.
|
Infants and children who drink water containing lead in
excess of the action level could experience delays in their
physical or mental development. Children could show slight
deficits in attention span and learning abilities. Adults who
drink this water over many years could develop kidney problems
or high blood pressure.
|
Copper
|
TT
|
No more than (9) days in a six (6) month
period below the established minimum
|
Yes
|
During a 14-day period in January and February, phosphate
pump malfunctions resulted in below optimal dosages. Phosphate
was added to the water, but at a dosage below the state
designated minimum. Despite this lower than acceptable dosage,
phosphate residual concentrations in water leaving the plant and
entering the distribution system were maintained above the
established minimum.
|
The chemical feed pumps have all been repaired.
|
Corrosion of household plumbing system; Erosion of natural
deposits; Leaching from wood preservatives.
|
Copper is an essential nutrient, but some people who drink
water containing copper in excess of the action level over a
relatively short amount of time could experience
gastrointestinal distress. Some people who drink water
containing copper in excess of the action level over many years
could suffer liver or kidney damage. People with Wilson’s
disease should consult their personal doctor.
|
| City of Novi Lead
and Copper Monitoring at Customers’ Tap |
| Contaminant |
Test Date |
Units |
Health Goal MCLG |
Action Level
AL |
90th Percentile Value* |
Number of Samples Over AL |
Violation
yes/no |
Major Sources in
Drinking Water |
Lead
|
2005
|
ppb
|
0
|
15
|
0
|
0
|
No
|
Corrosion of household plumbing system;
Erosion of natural deposits.
|
Copper
|
2005
|
ppm
|
1.3
|
1.3
|
.429
|
0
|
No
|
Corrosion of household plumbing system;
Erosion of natural deposits; Leaching from wood
preservatives.
|
*The 90th percentile value means 90 percent of the homes tested
have lead and copper levels below the given 90th percentile value.
If the 90th percentile value is above the AL additional requirements
must be met.
| Key to Detected Contaminants
Tables |
| Symbol |
Abbreviation for |
Definition/Explanation |
MCLG
|
Maximum Contaminant Level Goal
|
The level of contaminant in drinking water below which there
is no known or expected risk to health.
|
MCL
|
Maximum Contaminant Level
|
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.
|
MRDLG
|
Maximum Residual Disinfectant Level Goal
|
The level of a drinking water disinfectant below which there
is no known or expected risk to health. MRDLGs do not reflect
the benefits of the use of disinfectants to control microbial
contaminants.
|
MRDL
|
Maximum Residual Disinfectant Level
|
The highest level of a disinfectant allowed in drinking
water. There is convincing evidence that addition of a
disinfectant is necessary for control of microbial contaminants.
|
ppb
|
Parts per billion
(one in one billion)
|
The ppb is equivalent to micrograms per liter. A microgram =
1/1000 milligram.
|
ppm
|
Parts per million
(one in one million)
|
The ppm is equivalent to milligrams per liter. A milligram =
1/1000 gram.
|
NTU
|
Nephelometric Turbidity Units
|
Measures the cloudiness of water.
|
TT
|
Treatment Technique
|
A required process intended to reduce the level of a
contaminant in drinking water.
|
AL
|
Action Level
|
The concentration of a contaminant, which, if exceeded,
triggers treatment or other requirements which a water system
must follow.
|
HAA5
|
Haloacetic acids
|
HAA5 is the total of bromoacetic, chloroacetic,
dibromoacetic, dichloroacetic, and trichloroacetic acids.
Compliance is based on the total.
|
TTHM
|
Total Trihalomethanes
|
Total Trihalomethanes is the sum of chloroform,
bromodichloromethane, dibromochloromethane, and bromoform.
Compliance is based on the total.
|
n/a
|
Not applicable
|
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>
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Greater than
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