| TABLE OF DETECTED
CONTAMINANTS |
| City of Aberdeen Water |
|
|
|
| REGULATED
CONTAMINANTS |
|
|
| |
DATE |
LEVEL |
RANGE OF |
MCL |
|
|
| SUBSTANCE |
TESTED (1) |
DETECTED |
DETECTION |
or AL |
MCLG |
PRIMARY SOURCE OF SUBSTANCE |
| Microbiological
Contaminants |
|
|
| Coliform
Bacteria (2) |
|
1 |
n/a |
1 |
0 |
Naturally present in the environment |
| Turbidity
(NTUs) (3) |
|
2.99 (4) |
0.03
- 2.99 |
TT=5 |
n/a |
Soil runoff |
| Radioactive
Contaminants (pCi/l) |
|
|
| Alpha Emitters |
6/26/97 |
1 |
n/a |
15 |
0 |
Erosion of natural deposits |
| Inorganic
Contaminants (all values in ppb) |
|
|
| Antimony |
|
<1 |
n/a |
6 |
6 |
Discharge from petroleum refineries;
fire retardants; ceramics; elecronics; solder |
| Arsenic |
|
1 |
n/a |
50 |
n/a |
Erosion of natural
deposits; runoff from orchards; runoff from glass and electronics production
wastes |
| Barium |
|
<1 |
n/a |
2 |
2 |
Discharge of drilling
wastes; discharge from metal refineries; erosion of natural deposits |
| Beryllium |
|
<1 |
n/a |
4 |
4 |
Discharge from metal
refineries and coal-burning factories; discharge from electrical, aerospace
and defense industries. |
| Cadmium |
|
<1 |
n/a |
5 |
5 |
Corrosion of
galvanized pipes; erosion of natural deposits; runoff from waste batteries
and paints |
| Chromium |
|
<1 |
n/a |
100 |
100 |
Discharge from steel
and pulp mills; erosion of natural deposits. |
| Lead |
11/8/1996 |
<4 (5) |
<1 - 15 |
AL=15 |
0 |
Corrosion of
household plumbing systems; erosion of natural deposits. |
| Mercury |
|
<1 |
n/a |
2 |
2 |
Erosion of natural
deposits; runoff from landfills and cropland; discharge from refineries |
| Nitrate |
|
<1 |
n/a |
10 |
10 |
Runoff from
fertilizer use; leaching from septic tanks; sewage; erosion of natural
deposits. |
| Selenium |
|
1 |
n/a |
50 |
50 |
Discharge from
petroleum and metal refineries; erosion of natural deposits; discharge from
mines |
| Volatile
Organic Contaminants (ppb) |
|
|
| Total
Trihalomethanes (TTHMs) |
|
8 |
8 - 12 |
100 |
n/a |
By-product of drinking water
chlorination |
|
|
|
| UNREGULATED
CONTAMINANTS |
|
|
| |
DATE |
LEVEL |
RANGE OF |
|
|
|
| SUBSTANCE |
TESTED |
DETECTED |
DETECTION |
MCL |
MCLG |
PRIMARY SOURCE OF SUBSTANCE |
| Bromodichloromethane (ppb) |
|
3 |
3 - 4 |
Unregulated |
By-product of
drinking water chlorination |
| Dibromochloromethane (ppb) |
|
<1 |
0.6 - 0.9 |
Unregulated |
By-product of drinking water
chlorination |
| Chloroform
(ppb) |
|
6 |
4 - 7 |
Unregulated |
By-product of drinking water
chlorination |
| Sulfate (ppm) |
|
259 |
n/a |
Unregulated |
Erosion of natural deposits |
|
|
|
| Note: The symbol (<) means "Less
Than." As an example, the
detected level of antimony in the upper table is shown to be <1, meaning
"less than one ppb (part per billion)." |
| The actual value is 0.2 or
one-fifth of one part per billion. We
show the values as whole numbers for simplicity. For a listing of the actual decimal values, contact the
Aberdeen Water Works. |
| Footnotes: |
|
|
| (1) The state allows us to test for some substances less than once
per year because the concentrations of these substances do not change
frequently. The only dates to |
| appear in this
column are for tests performed prior to 1998. |
|
|
| (2) One sample was tested positive for coliform bacteria. The location was immediately retested and
no bacteria was found. This one positive sample is the only one detected in
1998. |
| The MCL for this
substance is less than 5% presence of coliform bacteria per month, or less
than one sample per month. |
| (3) Turbidity is a measure of the cloudiness of the water. We monitor it continuously at the water
treatment plant because it is a measure of the effectiveness of our
filtration system. |
| (4) The month in which this unusually high turbidity measurement was
taken (March) was also the month with the lowest percentage of samples (84%)
meeting the turbidity limit of 0.5 NTU.
|
| See the Surface
Water Treatment Rule section on page 2 of the report. |
|
|
| (5) This number is the 90th percentile value. At this level, 90% of the samples tested
were found to contain no more than 4 (3.6) ppb lead. There were no sites above the action level
(AL) of 15 ppb. |
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