Friday, November 4, 2011

Well water Summary

This is a revision and update of something i did back in June, when the old fresnel glasses were what i had.
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

Uranium – Erosion from natural deposits


[2] http://water.epa.gov/drink/contaminants/index.cfm
[3] http://www.ncbi.nlm.nih.gov/pubmed/10555138
[4] http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=316&tid=56
[5] http://www.epa.gov/radon/pubs/citguide.html#radonwater
[6] http://water.epa.gov/drink/contaminants/index.cfm
Post a Comment