Ganga-Meghna Brahmaputra || West Bengal || Bangladesh || Middle Ganga Plain, Bihar || Uttarpradesh
Jharkhand || North-East Hilly States || Rajnandgaon, Chattisgarh || Behala, Kolkata, WB || As toxicity- Homeopathic Treatment
Effectiveness & Reliability - As Field Testing Kits || Utility Of Treatment Plant
Causes, Effects & Remedies - Groundwater As Calamity || References

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Groundwater Arsenic contamination in West Bengal-India (20 years study )

Reported work done by SOES

Groundwater arsenic contamination status of Malda district, one of the nine arsenic affected districts of West Bengal-India

Location and demography
The District is situated between the latitude and longitude figures of 24040’20”N to 25032’08”N and 88028’10”E to 87045’50”E respectively and surrounded by Bangladesh and South Dinajpur in the east, Santal Parganas of Jharkhand state in the west, Uttar Dinajpur in the north and Murshidabad in the south.
The district has 15 blocks, 147 GP, 1642 inhabited villages and 42 wards (in two Municipalities) in Malda district. The district has a total population of 32,90,468 inhabitants (16,89,406 males and 16,01,062 females).

Arsenic contamination status in groundwater of Malda district
To date, we have analyzed 4449 hand tubewell water samples from 325 villages / wards in 65 GPs/ Municipal area from 14 blocks. Figure I shows the Pie-diagram distribution of arsenic in tubewell water from 14 blocks of Malda district.  We found arsenic concentration above 10 µg/L in 2322 (52.2%) hand tubewells, in 1512 (34%) above 50 µg/L and 282 (6.3%) of the tubewells had arsenic concentrations above 300µg/L (Table I). 244, 209 and 66 villages contains arsenic above 10, 50 and 300 µg/L respectively and in 13, 9 and 7 blocks contains arsenic above 10, 50 and 300 µg/L respectively. In Kaliachak II block the maximum arsenic contamination level was found (1904 µg/L).

Groundwater arsenic situation and sufferings of people in Malda district

Block
Total samples analysed 
Distribution of total samples in different arsenic concentration (mg/L) ranges
%of Samples with As >10mg/L
% of Samples with As >50mg/L
Max. conc. mg/L (samples with As >1000mg/L

≤3

4-10

11-50

51-100

101-200

201-300

300-500

501-1000

Bamangola

14

14

 

 

 

 

 

 

 

0

0

>3

Chanchal I

107

96

8

3

 

 

 

 

 

2.8

0

23

Chanchal II

171

112

36

18

4

1

 

 

 

13.5

2.9

173

English Bazar

333

159

10

47

51

44

16

6

 

49.2

35.1

484

Gazole

29

27

1

1

 

 

 

 

 

3.4

0

30

Harishchandrapur I

23

10

6

7

 

 

 

 

 

30.4

0

48

Harishchandrapur II

70

58

9

3

 

 

 

 

 

4.3

0

15

Kaliachak I

1750

402

156

423

234

308

104

83

37

68.1

43.9

1500 (3)

Kaliachak II

414

109

22

45

41

99

34

32

31

68.4

57.5

1904 (1)

Kaliachak I II

682

375

49

85

49

44

16

28

18

37.8

25.4

1852 (18)

Malda Old

182

97

25

46

9

3

 

2

 

33.0

7.7

357

Manikchak

371

142

23

68

67

51

7

9

4

55.5

37.2

710

Ratua I

150

118

9

13

8

2

 

 

 

15.3

6.7

151

Ratua II

153

35

19

51

25

7

6

3

7

64.7

31.4

779

Total

4449

1754

373

810

488

559

183

163

97

52.2

34.0

1904 (22)

 

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