Residents who participated in the 2022 Seacoast Private Initiative Pilot Project have all received their laboratory results and a “Be Well Informed” report. The following table is a summary of the results from these 84 wells.
From these results we can make the following observations:
Arsenic and Radon are two naturally occurring contaminants of concern found in many of Madbury’s residential wells. The 2022 results for arsenic and radon are similar to those in past well water testing events.
PFAS chemicals in the tested wells generally showed levels below NH current limits. (DES has contacted the residents with PFAS contamination exceeding these limits.)
Residents on a prescribed low sodium diet should take note of the sodium levels contributed by their well water.
Flushing plumbing is an effective mechanism for reducing exposure to lead and copper.
The Water Resource Board plans to present a more in depth analysis of the test results at Madbury Day in September.
Parameter |
Limit |
Number of wells |
% of Wells |
|
|
|
|
Total Coliform Bacteria |
ABSENT |
14 |
17% |
|
|
|
|
E.coli Bacteria |
ABSENT |
0 |
0% |
|
|
|
|
Arsenic |
0.005 mg/L |
31 |
37% |
|
|
|
|
Radon |
2000 pCi/L |
40 |
48% |
|
|
|
|
Uranium |
0.03 mg/L |
0 |
0% |
|
|
|
|
Fluoride |
4 mg/L0 |
0 |
0% |
|
|
|
|
Nitrite |
1 mg/L |
0 |
0% |
|
|
|
|
Nitrate |
10 mg/L |
2 |
2% |
|
|
|
|
Chloride |
250 mg/L |
1 |
1% |
|
|
|
|
Manganese |
0.3 mg/L |
1 |
1% |
|
|
|
|
Iron |
0.3 mg/L |
2 |
2% |
|
|
|
|
Lead |
0.015 mg/L |
1 |
1% |
|
|
|
|
Lead Stagnant |
0.015 mg/L |
1 |
1% |
|
|
|
|
Copper |
1.3 mg/L |
0 |
0% |
|
|
|
|
Copper Stagnant |
1.3 mg/L |
0 |
0% |
|
|
|
|
Sodium |
250 mg/L |
0 |
0 |
|
|
|
|
Sodium @ Low Sodium Diet Health Advisory |
20 mg/L |
35 |
42% |
|
|
|
|
PFOA |
12 ppt |
3 |
4% |
|
|
|
|
PFOS |
15 ppt |
1 |
1% |
|
|
|
|
PFNA |
11 ppt |
0 |
0% |
|
|
|
|
PFHxS |
18 ppt |
0 |
0% |
|
|
|
|
pH less than 7 |
|
9 |
11% |
|
|
|
|
pH @ 7 |
|
1 |
1% |
|
|
|
|
pH greater than 7 |
|
74 |
88% |
|
|
|
|
Hardness less than 60 mg/L (soft) |
|
33 |
39% |
|
|
|
|
Hardness 61-120 mg/L (moderate hard) |
|
20 |
24% |
|
|
|
|
Hardness 121-180 mg/L (hard) |
|
18 |
21% |
|
|
|
|
Hardness greater than 180 mg/L (very hard) |
|
13 |
15% |
|
|
|
|
Stagnant Lead Detected (First Draw) |
|
38 |
45% |
|
|
|
|
Lead Detected (Flushed) |
|
8 |
10% |
|
|
|
|
Stagnant Copper Detected (First Draw) |
|
43 |
51% |
|
|
|
|
Copper Detected (Flushed) |
|
7 |
8% |