There were errors and this is the first revision. there will be more. I have all the data and there are sevral question i am asked.
One is about radon and is it really correct oplace it at the top? I have supporting data that i can not use because i do not have a "hard copy" of the results from someone who tests and did a comparrison that ranks very similar to my information (a bit down from my numbers, but very significant).
The
following is a summarization of water tests that have been submitted to or
performed by the Stamford Health Department Lab and the various issues and
problems that have been found. We used
simple criteria of having more than 25 tests results (0.5% of wells in
Stamford).
The
following tables are an overview. The same
evaluation parameters are used for each item in this table. Samples with treatment are not included. Multiple
tests from one location only show the highest results. Tests for pesticides
which were performed by the one lab not certified to do so and were using
unapproved methods were removed (7 addresses).
This also includes older test where the detection limit was limited to
0.1ug/L (51 addresses, 12 repeated by newer tests).
TABLE 1a – Health Dangers related to cancer
item
|
Average in number tested
|
Highest value found
|
Number of addresses recorded
|
Descriptions
|
||
Percentages
|
||||||
Radon
|
35,316 pCi/L
|
555,000 pCi/L
|
99
|
At or Above RL
(5,000 pCi/L)
|
At or Above CT average
(7,000 pCi/L)
|
|
75.76%
|
72.73%
|
|||||
Uranium
|
0.020 mg/L
|
0.77 mg/L
|
46
|
present
|
At or Above MCL
(0.03 mg/L)
|
|
56.52%
|
6.52%
|
|||||
Arsenic
|
0.0022 mg/L
|
.010 mg/L
|
134
|
present
|
At or Above MCL (0.010 mg/L)
|
|
43.28%
|
2.24%
|
|||||
Dieldren
|
0.0258 ug/L
|
1.30 ug/L
|
499
|
present
|
At or Above AL
(0.03 ug/L)
|
|
15.03%
|
9.02%
|
|||||
Chlordane
|
0.0416 ug/L
|
2.90 ug/L
|
499
|
At or Above AL
(0.3 ug/L)
|
At or Above MCL
(2.0 ug/L)
|
|
9.62%
|
4.21%
|
0.20%
|
||||
Other pesticides
|
0.0035 ug/L
|
0.32 ug/L
|
499
|
present
|
AT or Above MCL (various)
|
|
4.01%
|
0.00%
|
|||||
Total pesticides
|
0.054 ug/L
|
2.90 ug/L
|
499
|
Present
|
At or Above MCL
|
|
19.04%
|
9.62%
|
|||||
Each of
these items have some indication to a risk for cancer, the following is a discussion
on risk by other agencies and studies.
Dieldren is seen as being the most controversial item as far a cancer
risk, with many studies NOT implicating it.
While there is some controversy concerning Radon in water, there is a
direct link to Radon in air and lung cancer and a general rule as far as how
much water borne radon contributes to air radon (every 10,000 pCi/L in the water, contributes 1.0 pCi/m3
in the air)
Arsenic - Skin damage or problems with
circulatory systems, and may have increased risk of getting cancer[1]
Chlordane - Liver or nervous system problems;
increased risk of cancer[2]
Dieldren - In 1987, the US Environmental
Protection Agency (EPA) classified aldrin and dieldrin as category B2
carcinogens, i.e. probable human carcinogens, based largely on the increase in
liver tumors in mice fed either organochlorine insecticide. At that date, the
relevant epidemiology was deemed inadequate to influence the cancer risk assessment.[3]
There is no
conclusive evidence that aldrin or dieldrin cause cancer in humans. Aldrin and
dieldrin have shown to cause liver cancer in mice. The International Agency for
Research on Cancer (IARC) has determined that aldrin and dieldrin are not
classifiable as to human carcinogenicity. The EPA has determined that aldrin
and dieldrin are probable human carcinogens.[4]
Radon - The radon in your water supply
poses an inhalation risk and an ingestion risk. Research has shown that your
risk of lung cancer from breathing radon in air is much larger than your risk
of stomach cancer from swallowing water with radon in it. Most of your risk
from radon in water comes from radon released into the air when water is used
for showering and other household purposes.[5]
Uranium - Increased risk of cancer, kidney
toxicity[6]
The
probable sources for each of these items are from.
Arsenic – Erosion of natural deposits; runoff
from orchards; leeching from pressure treated wood (1940 to 2004, especially
since 1970), runoff from glass and electric production wastes.
Chlordane – Residue of banned termiticide
Dieldren – Residue of banned insecticide,
breakdown product of aldrin (also a banned pesticide used in agriculture for
root vegetables)
Radon – Erosion form natural deposits
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1 comment:
Thank you for sharing.
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