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ANNUAL WATER QUALITY REPORT |
 |
| Secondary
standards establish nonenforceable secondary maximum contaminant levels
(SMCLs) and are intended to apply to any contaminant in drinking water which
may adversely affect the aesthetic qualities of the water including taste,
odor and appearance but do not threaten public health.
These SMCLs are guidelines and are not enforceable standards. |
|
Contaminant
|
SMCLs
|
Ashburton
Plant
|
Source
|
|
|
|
Annual
Average (ppm)
|
|
|
Chloride |
250
ppm |
28
|
Erosion
of natural deposits. |
|
Color |
15
|
1
|
Organic
chemicals and algae |
|
pH |
6.5
- 8.5 |
7.9
|
Erosion
of natural deposits, rainfall |
|
Total Residue
|
500
ppm |
129.4
|
Erosion
of natural deposits. |
|
Iron |
0.30
ppm |
0.01
|
Erosion
of natural deposits. |
|
Manganese |
0.05
ppm |
0.01
|
Erosion
of natural deposits. |
|
Aluminum |
0.05
ppm |
0.06
|
Erosion
of natural deposits; used in water treatment. |
|
*Sodium |
20
ppm |
11.1
|
Erosion
of natural deposits; seasonal run-off. |
|
Sulfate |
250
ppm |
14.1
|
Erosion
of natural deposits. |
|
Zinc |
5
ppm |
<0.005
|
Erosion
of natural deposits. |
|
Contaminant
|
|
Montebello
Plants |
|
|
|
|
Annual
Average (ppm) |
|
|
|
250
ppm |
37 |
Erosion of natural deposits. |
|
Color
|
15 |
1 |
Organic
chemicals and algae |
|
pH
|
6.5
- 8.5 |
8.0 |
Erosion
of natural deposits, rainfall |
|
Total
Residue |
500
ppm |
162.6 |
Erosion
of natural deposits. |
|
Iron
|
0.30
ppm |
0.01 |
Erosion
of natural deposits. |
|
Manganese
|
0.05
ppm |
0.01 |
Erosion
of natural deposits. |
|
Aluminum
|
0.05
ppm |
0.06 |
Erosion
of natural deposits; used in water treatment . |
|
*Sodium
|
20
ppm |
14.7 |
Erosion
of natural deposits; seasonal run-off. |
|
Sulfate
|
250
ppm |
15.0 |
Erosion
of natural deposits. |
|
Zinc
|
5
ppm |
<0.005 |
Erosion
of natural deposits. |
Unregulated Contaminant:
|
Contaminant |
Ashburton
Plant |
Montebello
Plants |
Source |
||
|
|
HLD |
Range |
HLD |
Range |
|
|
Aldrin |
<0.05 |
- |
<0.05 |
- |
Pesticide/herbicide |
|
Dicamba |
<0.5 |
- |
<0.5 |
- |
Pesticide/herbicide |
|
Dieldrin |
<0.05 |
- |
<0.05 |
- |
Pesticide/herbicide |
|
**Methyl
Tert Butyl Ether (MTBE) |
<0.5 |
- |
<0.5 |
- |
Gasoline
additive |
|
Metolachlor |
<0.01 |
- |
<0.01 |
- |
Pesticide/herbicide |
*ppb
These contaminants are not presently regulated so no regulatory standard is
listed above.
|
* Sodium levels in
the water supply are often of concern to consumers who contact our facilities.
Sodium naturally occurs in raw waters but the concentration can
be increased due to the influence of run-off from road surfaces treated
with rock salt during snow and ice removal efforts. During the year 2001,
the average sodium concentrations measured in the finished water from
the Ashburton and Montebello Water Treatment Plants were 11.1
ppm and 14.7
ppm respectively and are considered low.
To illustrate how low these levels are, you would have to drink
about 12 gallons of water to equal the sodium level in one hot dog.
** Heightened interest continues this year regarding the presence of MTBE, (Methyl-tertiary-butyl-ether) primarily in some of our nation’s ground water supplies. MTBE, a gasoline additive formulated to reduce vehicle emissions, has been in widespread use since 1979. Its use was further expanded in 1992 to help achieve goals outlined in the EPA’s Clean Air Act. MTBE has not been detected in tests of Baltimore’s water supplies.
Most
incidences of contamination have been traced to leaking underground storage
tanks and pipelines, spills, discharge from marine engines into water
bodies and to a lesser degree form air deposition according to the EPA.
As
a result of the water quality concerns, legislation was recently introduced
with the intended purpose of either eliminating or significantly reducing
the use of this additive. |
|
|
|