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Radon may occur in well water or water from public sources (Community Water Supplies).
As of this moment no regulations or guidelines are applicable, but there are indications
that by the year 2004 the EPA will adopt guidelines for companies that deliver water
to the public.
Currently
there are two levels mentioned in this discussion:
For states that implement
a multimedia mitigation (MMM) program (i.e. inform the public that radon can be caused
by various sources: soil and water) the radon concentration level may be 4000 pCi/L
(per liter of water). This is known as the Alternate Maximum Contamination Level
(AMCL).
For states that do not implement a multimedia mitigation (MMM) program
the level will probably be set at 300 pCi/L (per liter of water). This is known as
the Maximum Contamination Level (MCL).
In comparing the guideline for the
action level concentration of radon in air - 4 pCi/L (per liter of air) - with the
action levels in water as indicated above there is a large difference because of
the higher density of water than air. For example from previous scientific studies
it was derived that on the average every 10,000 pCi/L per liter water in a home contributes
approximately 1 pCi/L per liter of air to the indoor air environment.
For this
reason it makes sense to test the well water in a home where high indoor air levels
exist as part of the testing before mitigation of the indoor air environment starts.
Nevertheless at the same time it makes sense to mitigate the indoor air quality based
on soil-gas release first, because this contribution to the indoor air radon concentration
is usually higher.
For example if a well in a house has 50,000 pCi/L per liter
water and the radon concentration in air is measured to be 45 pCi/L per liter air,
the contribution of the radon in water to the indoor air can be estimated to be 5
pCi/L. The usual soil type mitigations (ASD such as SSD or SMD) alone (even if done
completely) will on the average not be able to bring the radon concentration in the
indoor air in this house down to below 5 pCi/L. Here both types of mitigations would
be necessary to reach the EPA indoor air Action Level of 4 pCi/L per liter air.
Rn-222
Contact us via our phone number (970) 416-0196. After a deposit
by mail or credit card is processed we can send you three test bottles with instructions
how to properly extract water from your well. Send these bottles to us by express
mail using enough packaging material around it and the analysis can be done within
24 hours after we get your sample. For fastest result we fax or e-mail the written
report. The following photo shows the test emenation process that follows manufacturer's
guidelines.
Test of water for concentration of Radon-222
Ra-226
Contact us via our phone number (970) 416-0196. See photo
below of two sample radium-226 tests.
Test of water for concentration of Radium-226
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