2007
DRINKING WATER QUALITY REPORT
USEPA requires water systems to test for many substances;
those listed below were
detected in
our water, and all were well below the maximums set by USEPA.
| Contaminant |
Average
Level |
Minimum
Level |
Maximum
Level |
MCL |
MCLG |
Source of
Contaminant |
Barium (ppm)
(2004) |
0.054 |
0.054 |
0.054 |
2 |
2 |
Erosion of natural
deposits; discharge of drilling wastes; discharge from metal refineries |
Chromium (ppb)
(2004) |
1.2 |
1.2 |
1.2 |
100 |
100 |
Discharge from
steel and pulp mills; erosion of natural deposits |
| Fluoride (ppm) |
0.7 |
0.5 |
1.4 |
4 |
4 |
Erosion of natural
deposits; water additive which promotes strong teeth; discharge from
aluminum & fertilizer factories |
| Nitrate (ppm) |
- |
- |
0.25 |
10 |
10 |
Erosion of natural deposits; runoff from
fertilizer use; leaching from septic tanks; sewage |
| Gross Beta
Emitters (2005) (pCi/L) (Radiochemical) |
- |
- |
3.1 |
50 |
NA |
Decay of natural
and manmade deposits |
| Contaminant |
The
90th
Percentile |
Number
of Sites Exceeding Action Level |
Action
Level |
Source
of Contaminant |
| Lead
(ppb) |
1.6000 |
0 |
15 |
Erosion of natural deposits;
corrosion of household plumbing systems |
|
Copper (ppm) |
0.114 |
0 |
1.3 |
Erosion of natural deposits;
corrosion of household plumbing systems; leaching from wood preservatives |
| Contaminant |
Average
Level |
Minimum
Level |
Maximum
Level |
MCL |
Unit
of Measure |
Source of
Contaminant |
| Total Haloacetic
Acids |
26.75 |
12.00 |
32.80 |
60 |
ppb |
By-product of
drinking water disinfection |
| Total
Trihalomethanes |
52.35 |
35.20 |
65.10 |
80 |
ppb |
By-product of
drinking water disinfection |
|
Bromoform, chloroform,
bromodichloromethane, and dibromochloromethane are disinfection byproducts.
There is no maximum contaminant level for these chemicals at the entry point
to distribution. |
| Contaminant |
Average
Level |
Minimum
Level |
Maximum
Level |
Unit
of Measure |
Source of
Contaminant |
| Chloroform |
24.90 |
6.40 |
41.50 |
ppb |
By-product of
drinking water disinfection |
| Bromoform |
2.25 |
<1.00 |
6.50 |
ppb |
By-product of
drinking water disinfection |
|
Bromodichloromethane |
16.10 |
10.40 |
19.30 |
ppb |
By-product of
drinking water disinfection |
|
Dibromochloromethane |
9.10 |
11.90 |
11.90 |
ppb |
By-product of
drinking water disinfection |
| Contaminant |
Highest Single
Measurement |
Lowest
Monthly % of Samples Meeting Limits |
Turbidity
Limits |
Unit of
Measure |
Source
of Contaminant |
| Turbidity |
0.31
|
98.5% |
0.30 |
NTU |
Soil runoff |
| Turbidity
has no health effects. However, turbidity can interfere with
disinfection and provide a medium for microbial growth. Turbidity
may indicate the presence of disease-causing organisms. These
organisms include bacteria, viruses, and parasites that can cause symptoms
such as nausea, cramps, diarrhea and associated headaches. |
| Total
Organic Carbon (TOC) has no health effects. However, TOC can cause
disinfection by-products with as yet unknown effects. |
| Contaminant |
Highest
Level |
Lowest
Level |
Average
Level |
Unit
of Measure |
Source |
| Total Organic
Carbon |
4.22 |
2.79 |
3.68 |
ppm |
Organic matter
from runoff |
| Disinfectant
residuals are required to keep the water free from harmful microbial
contaminants, levels below the Maximum Disinfectant Level (MRDL) have no
known or expected health risks.. |
| Disinfectant |
Average
of All Measurements |
MRDL |
Unit
of Measure |
Source |
| Chloramines |
2.5 |
4.0 |
ppm |
Added during
treatment to protect against microbial contaminants |
| Constituent |
Average
Level |
Minimum
Level |
Maximum
Level |
Secondary |
Source |
Calcium (ppm)
(2004) |
38.8 |
38.8 |
38.8 |
NA |
Abundant
naturally occurring element |
Hardness (ppm)
(2004) |
184.0 |
184.0 |
184.0 |
NA |
Naturally
occurring in calcium and magnesium |
Magnesium (ppm)
(2004) |
21.1 |
21.1 |
21.1 |
NA |
Abundant
naturally occurring element |
Sodium (ppm)
(2004) |
22.0 |
22.0 |
22.0 |
300.0 |
Erosion of
natural deposits; byproduct of oil field activity |
| Bicarbonate (ppm) |
173.0 |
173.0 |
173.0 |
NA |
Corrosion of
carbonate rocks such as limestone |
| pH (Units) |
7.7 |
7.5 |
8.0 |
7.0 |
Hydrogen ion
concentration |
| Total Alkalinity
(ppm) |
142.0 |
142.0 |
142.0 |
NA |
Naturally
occurring soluble mineral salts |
| Total Dissolved
Solids (ppm) |
279.0 |
279.0 |
279.0 |
1000.0 |
Total dissolved
mineral constituents in water |
NOTE: Fecal coliforms
and total coliforms were not detected in 2007 samplings. We
test for coliforms in ten different locations in our water distribution system each month.
This verifies that our disinfection system is effective.
MCL (maximum contaminant level) = This is the highest level of a
contaminant that is allowed by regulation in drinking water. MCLs are set as close
to the MCLG as feasible using the best available treatment technology.
MCLG
(maximum contaminant level goal) = This is 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.
MRDL
(maximum residual disinfectant level) = The highest level of disinfectant
allowed in drinking water. There is convincing evidence that addition of a
disinfectant is necessary for control of microbial contaminants.
pCi/L =
picocuries per liter (a measure of radioactivity).
ppm =
parts per million or milligrams per liter.
ppb =
parts per billion of micrograms per liter.
ACTION LEVEL
= the concentration of a contaminant
which, if exceeded, triggers treatment or other requirements which a water system must
follow.
NTU (Nephelometric Turbidity Units)
= A measure of
turbidity. Turbidity is a measure of clarity of water; the lower, the better.
Back to Top
Back to Previous Page