| Nesenkeag |
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EPA # 1392240 |
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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) |
10/9/08
12/3/08 |
7 |
nd - 7 |
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 known
to cause cancer in humans at high concentrations and is linked to other
health effects such as skin damage and circulatory problems. |
| Fluoride
(ppm) |
10/9/08 |
0.52 |
N/A |
4 |
4 |
No |
Erosion of natural deposits |
| Sodium (ppm) |
10/9/08 |
32.1 |
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 |
0.33 Avg |
nd - 0.6 |
4 |
4 |
No |
Water additive used to control microbes |
| Total
Trihalomethanes (ppb) |
8/4/10 11/3/10 |
8.3 |
5.5 - 8.3 |
80 |
0 |
No |
By-product of drinking water chlorination |
| Radiological
Contaminants |
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| Compliance Gross Alpha
(pCi/L) |
1/27/06
6/8/06 |
2.6 |
2.6 |
15 |
0 |
No |
Erosion of natural deposits |
| Radium
226 & 228 (pCi/L) |
1/27/06 6/8/06 |
0.6 |
0.3 - 0.6 |
5 |
0 |
No |
Erosion of natural deposits |
| Uranium
(ppb) |
1/27/06 6/8/06 |
6.5 |
5.4 - 6.5 |
30 |
0 |
No |
Erosion of natural deposits |
| Radon
(pCi/L) |
5/5/10 |
4,210 |
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) |
10/9/09 |
< 5 |
15 |
0 |
9 |
0 |
No |
Corrosion of household plumbing system |
| Copper
(ppm) |
10/9/09 |
0.249 |
1.3 |
1.3 |
9 |
0 |
No |
Corrosion of household plumbing system |
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| What is the
source of my drinking water? |
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| The source of the Nesenkeag Hill water supply is two wells and a
pump station located between Jewell Court and Raintree Drive in Londonderry,
NH. Well # 1 is located 960 feet
northwest of the pump house. Well # 2
is located 280 feet northwest of the pump house. Treatment consists of chlorine addition to
kill bacteria, softening to reduce hardness and remove iron and manganese,
phosphates to sequester iron and manganese and aid corrosion control, and pH
adjustment using potassium carbonate to aid in corrosion control. |
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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 |
10 |
1 |
1 |
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| Bedrock
Well # 2 |
2/28/06 |
10 |
1 |
1 |
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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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