Department of Water
2001 Water Quality Report
We are proud to report that the City of
Dayton complied with all federal & state standards for safe drinking water
during 2000!
|
REGULATED SUBSTANCE |
Highest Level Allowed
(MCL |
Ideal Goals (MCLG) |
Highest Level Detected |
Range of Detection |
Sources of
Contaminants |
Regulated at the
Treatment Plant
| Fluoride (ppm) |
4 |
4 |
1.051 |
0.27 - 1.42 |
Natural geology/supplement |
| Nitrate (ppm) |
10 |
10 |
1.99 |
0.42 - 1.99 |
Fertilizer runoff/natural geology |
| Turbidity (NTU) |
TT = 5 TT
³ 95% must
be £ 0.5 |
N/A |
0.16
100%2 |
0.03 - 0.16 |
Lime softening residuals |
| Vinyl Chloride (ppb) |
2 |
0 |
0.44 |
ND - 0.44 |
Discharge from plastics factories |
| Cis-1,2-dichloroethylene (ppb) |
70 |
70 |
0.97 |
ND - 0.97 |
Discharge from industrial chemical
factories |
| Toluene |
1000 |
1000 |
0.84 |
ND - 0.84 |
Discharge from factories |
| Methylene Chloride (ppb) |
5 |
0 |
0.97 |
ND - 0.97 |
Discharge from chemical factories |
| Trichloroethylene (ppb) |
5 |
0 |
0.49 |
ND - 0.49 |
Discharge from factories |
Regulated at the
Customer's Tap
| Lead (ppb) |
AL = 15 |
0 |
6.83 |
3 Samples > AL
ND - 27 |
Corrosion of household plumbing materials |
| Copper (ppm) |
AL = 1.3 |
1.3 |
0.0853 |
No Samples > AL
ND - 0.225 |
Regulated in the Distribution System
| Coliform Bacteria (% positive samples/month) |
5% |
0 |
0.7%4 |
|
Naturally present in the environment |
| Trihalomethanes (ppb) |
100 |
0 |
245 |
10 - 40 |
By-product of chlorination |
|
Unregulated Compounds - concentration in ppb
| Bromodichloromethane |
N/A |
N/A |
2.0 |
0.8 - 2.0 |
|
Bromoform |
N/A |
N/A |
0.7 |
ND - 0.7 |
|
Chloroform |
N/A |
N/A |
1.6 |
ND - 1.6
| By-products of drinking water
chlorination
|
| Dibromochloromethane |
N/A |
N/A |
2.2 |
ND - 2.2 |
|
Haloacetic Acids |
N/A |
N/A |
5.4 |
ND - 5.4 |
1 Highest monthly average
2 All samples were less that 0.5 NTU. Turbidity is used to measure the
performance of sand filters.
3 90% of samples were less than 6.8ppb for lead and less than 0.085ppm
for copper. Lead and copper were not detected in most of the samples.
4 in 2000 only two of 1,511 distribution samples were positive for coliform bacteria.
the repeat samples were negative.
5 Highest running annual average.
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.
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.
NTU =
Nephelometric Turbidity Units (measure of "cloudiness")
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 for a water system.
pCi/l =
picocuries per liter (a measure of radioactivity)
ppm =
parts per million
ppb =
parts per billion
N/A =
Not applicable
£ less
than or equal to, ³ greater than or equal to, > greater than, < less than,
ND =
Not detected
The Source of Dayton’s drinking water is the Miami Valley Buried Aquifer. This Aquifer is a
large underground area of water-bearing sand and gravel deposits. This groundwater is influenced
by surface water. 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 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 contaminants, including synthetic and volatile organic
chemicals, which are byproducts of industrial processes and petroleum production, and can also
come from gas stations, urban stormwater runoff, and septic systems; and radioactive contaminants,
which can be naturally-occurring or be the result of oil and gas production and mining activities.
Source Water
Assessment information can be obtained from the Ohio E.P.A. Call (937)
285-6357.
| Radon is a radioactive gas that is
formed by the decay of uranium in rocks and soil. As
water passes through rock and soil, radon is dissolved
into ground water. Dayton's water plants had a maximum
radon concentration of 88 ppb. This is below the expected
standard. |
| For more information: City of
Dayton Water Dept., 3210 Chuck Wagner, Dayton, OH 45414
333-6030
| |
|
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. In order to ensure that tap water is safe to
drink, USEPA prescribes regulations which 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 which shall provide the same protection for public
health. 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).
|
|
Health Information: 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).
| |
City of Dayton citizens can participate
in decisions about water quality by attending City Commission meetings
and Environmental Advisory Board meetings. Call the Public Information Office at 333
- 3603 for meeting dates and times.
The following substances were not detected during 2000 water testing: Microbes: Cryptosporidium,
Giardia. Inorganics/Organics: Pesticides, PCBs, base neutral extracts, MTBE, SOCs, aluminum,
asbestos, arsenic, antimony, barium, beryllium, chromium, cyanide, mercury, selenium, thallium,
zinc. Radionuclides: Alpha radiation, Beta radiation, radium 226, radium 228, strontium 90,
uranium.
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