| Thurston
Woods |
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EPA # 1332050 |
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| E. coli Bacteria |
Positve/Negative |
Negative |
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0 |
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NO |
Naturally present in the
environment |
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| Health Effects |
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| Coliforms
are bacteria which are naturally present in the environment and are used as an indicator that other,
potentially-harmful, |
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| bacteria may be present. Coliforms were found in more samples than
allowed and this was a warning of potential
problems. |
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| Inorganic
Contaminants |
Date(s) Collected |
Highest Detect |
Range Detected |
MCL or MRDL |
MCLG or MRDLG |
Violation Yes/No |
Typical Source of Contaminant |
| Arsenic
(ppb) |
1/14/10
4/26/10 7/15/10 11/3/10 |
12 4.75-RAA |
nd - 12 |
10 |
N/A |
No |
Erosion of natural deposits; runoff from
orchards; runoff from glass and electronics production wastes. |
| Arsenic: While your drinking water meets EPA’s
standard for arsenic, it does contain low levels of arsenic. EPA’s standard
balances the current understanding of arsenic’s possible health effects
against the cost of removing arsenic from drinking water. EPA continues to
research the health effects of low levels of arsenic which is a mineral know
to cause cancer in humans at high concentrations and is linked to other
health effects such as skin damage and circulatory problems. |
| Nitrate as
Nitrogen (ppm |
4/26/10 |
0.42 |
N/A |
10 |
10 |
No |
Runoff from fertilizer use; leaching from
septic tanks, sewage; erosion of natural deposits. |
| Sodium (ppm) |
4/26/10 |
29.8 |
N/A |
Not Regulated |
N/A |
Natural sources; runoff from use as salt on
roadways; by-product of treatment process |
| Volatile Organic
Contaminants |
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| Chlorine (ppm) |
2010 |
0.43 Avg |
0.1 - 0.8 |
4 |
4 |
No |
Water additive used to control microbes |
| Total
Trihalomethanes (ppb) |
8/26/10 |
16 |
16 |
80 |
0 |
No |
By-product of drinking water chlorination |
| Haloacetic
Acids (ppb) |
8/26/10 |
6.5 |
N/A |
60 |
0 |
No |
By-product of drinking water chlorination |
| Radiological
Contaminants |
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| Radium 226 & 228
(pCi/L) |
2006 |
2.1 |
nd - 2.1 |
5 |
0 |
No |
Erosion of natural deposits |
| Radon
(pCi/L) |
4/21/10 |
321 |
N/A |
Not Regulated |
N/A |
Erosion of natural deposits |
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Date(s)
Collected |
90th Percentile |
Action Level |
MCLG |
# of Sites
Sampled |
# Sites Above
Action Level |
Violation
Yes/No |
Typical Source of Contaminant |
| Lead (ppb) |
11/20/08 |
< 5 |
15 |
0 |
5 |
0 |
No |
Corrosion of household plumbing system |
| Copper
(ppm) |
11/20/08 |
0.230 |
1.3 |
1.3 |
5 |
0 |
No |
Corrosion of household plumbing system |
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| What is the
source of my drinking water? |
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| Thurston
Woods obtains its water from two bedrock wells. Bedrock Well # 1 is located 154 feet south
of the pump house and is 760 feet deep and yields 10 gallons per minute. Bedrock Well # 2 is located 174 feet south
of the pump house and is 447 feet deep and yields 20 gallons per minute. Current water treatment consists of
chlorine for disinfection, aeration to remove radon, and an arsenic removal
system. |
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| Source Water
Assessment Summary |
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Summary of Susceptibility Factors |
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| Source
Name |
Date |
Low |
Med |
High |
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| Bedrock
Well # 1 |
2/28/06 |
9 |
3 |
0 |
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| Bedrock
Well # 2 |
2/28/06 |
9 |
3 |
0 |
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| The complete Assessment Report is available for
review. For more information call Gary
Tetley at 800-553-5191 ext. 2378 or visit NH Department of Environmental
Services Drinking Water and Groundwater Bureau web site at http://www.des.nh.gov/organization/divisions/water/dwgb/dwspp/reports/index.htm |
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