The
City of Virginia is pleased to provide you with the results of the water
quality monitoring performed on its drinking water for the period from January
1 to
The City of Virginia provides
drinking water to its residents from a surface water source: surface water
drawn from the Missabe Mountain Mine Pit. The Minnesota Department of Health
has determined that one or more sources of your drinking water are susceptible
to contamination. If you wish to obtain
the entire source water assessment regarding your drinking water, please call
The
treatment plant is a conventional water treatment facility, which is classified
by the Minnesota Department of Health (MDH) as a Class A facility, their
highest water treatment facility classification. The water treatment plant is managed by the
Virginia Department of Public Utilities with the assistance of Northeast
Technical Services, Inc., which provides the required MDH-certified operation
of the treatment facility.
Call Greg French at
No
contaminants were detected at levels that exceeded the federal standards. However, some
contaminants were detected in trace amounts that were below legal limits. The table that follows shows the contaminants
that were detected in trace amounts last year.
(Some contaminants are sampled less frequently than once a year; as a
result, not all contaminants were sampled for in 2008. If any of these contaminants were detected
the last time they were sampled for, they are included in the table along with
the date that the detection occurred.)
Key
to abbreviations:
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.
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.
TT-Treatment Technique:
A required process intended to reduce the level of a contaminant in
drinking water.
NTU-Nephelometric Turbidity Unit, used to measure clarity
in drinking water.
MRDL-Maximum Residual Disinfectant Level.
MRDLG-Maximum Residual Disinfectant Level Goal
AL-Action Level: The concentration of a contaminant,
which, if exceeded, triggers treatment, or other requirement that a water system
must follow.
90th
Percentile Level-This is the value
obtained after disregarding 10 percent of the samples taken that had the
highest levels. (For example, in a
situation in which 10 samples were taken, the 90th percentile level
is determined by disregarding the highest result, which represents 10 percent
of the samples.) Note: In situations in
which only 5 samples are taken, the average of the two with the highest levels
is taken to determine the 90th percentile level.
pCi/l-PicoCuries per liter (a measure of radioactivity)
ppb-Parts per billion, which can also be expressed as
micrograms per liter (ug/l).
ppm-Parts per million, which can also be expressed as
milligrams per liter (mg/l).
|
|
|
|
Level
Found |
|
|
|
Contaminant (units) |
MCLG |
MCL |
2008 Range |
Average Result* |
Typical
Source Of Contaminant |
|
Fluoride (ppm) |
4.0 |
4.0 |
1.2-1.3 |
1.2 |
State of |
|
Haloacetic Acids (HAA5)
(ppb) |
0 |
60.0 |
|
6.0 |
By-product of drinking
water disinfection. |
|
Nitrate (as Nitrogen)
(ppm) |
10.0 |
10.0 |
|
0.16 |
Runoff from fertilizer
use; Leaking from septic tanks, sewage; Erosion of natural deposits. |
|
TTHM (Total
Trihalomethanes) (ppb) |
0 |
80.0 |
|
24.5 |
By-product of drinking
water disinfection.
|
|
Total Coliform Bacteria |
0 present |
>1 present |
|
1 ** |
Naturally present in the
environment. |
*This
is the value used to determine compliance with Federal standards. It sometimes is the highest value detected
and sometimes is an average of all the detected values. If it is an average, it may contain results
from the previous year.
**Follow-up
sampling showed no contamination present.
|
Contaminant (units) |
MCLG |
MCL |
Lowest Quarterly ** |
Highest Single Measurement |
Typical
Source of Contaminant |
|
Turbidity (NTU) |
|
TT |
100% |
0.05 |
Soil Runoff |
** Percentage of Samples
Meeting the Turbidity Limits.
Turbidity is a measure of
the clarity of the water. We monitor it
because it is a good indicator of the effectiveness of our filtration system.
The Total Organic Carbon (
|
Contaminant (units) |
MRDLG |
MRDL |
Highest and Lowest Monthly Averages |
Highest Quarterly Average |
Typical
Source of Contaminant |
|
Chlorine (ppm) |
4.0 |
4.0 |
0.5-1.1 |
0.83 |
Water additive used to
control microbes |
|
Contaminant (units) |
MCLG |
|
90% Level |
# sites over |
Typical
Source of Contaminant |
|
Copper (ppm) |
|
1.3 |
0.89 |
1 out of 21 |
Corrosion of household
plumbing systems; Erosion of natural deposits |
|
Lead (ppb) |
|
15 |
3.0 |
0 out of 21 |
Corrosion of household
plumbing systems; Erosion of natural deposits |
Some
contaminants do not have Maximum Contaminant Levels established for them. These “unregulated contaminants” are assessed
using state standards known as health risk limits to determine if they pose a
threat to human health. If unacceptable
levels of an unregulated contaminant are found, the response is the same as if
an MCL has been exceeded; the water system must inform its customers and take
over corrective actions. In the table
that follows are the unregulated contaminants that were detected:
|
Contaminant
(units) |
Level
Found |
Typical
Source of Contaminant |
|
|
Range (2008) |
Average/ Result |
||
|
Sodium (ppm) |
|
15.0 |
Erosion of natural
deposits |
|
Sulfate (ppm) |
|
58.4 |
Erosion of natural
deposits |
Compliance
with National Primary Drinking Water Regulations
The sources of drinking water (both tap water
and bottled water) include rivers, lakes, streams, 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 from human activity.
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 stormwater 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 as 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 U.S. Environmental
Protection Agency (EPA) prescribes regulations that limit the amount of certain
contaminants in water provided by public water systems. Food and Drug Administration regulations
establish limits for contaminants in bottled water that must provide the same
protection for public health.
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 at
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 available from the Safe
Drinking Water Hotline at
This report is being published in its entirety in the Mesabi Daily News
on June 1, 2009. It is also posted on
the Virginia Public Utilities website at www.vpuc.com. It is not being mailed to customers. A copy is available upon request by
contacting the Business Office at Virginia Public Utilities at