Water Monitoring

 

In order to assess the water quality in the state, the Nagaland Pollution Control Board in collaboration with the Central Pollution Control Board under the National Water Quality Monitoring Programme (NWMP) monitors eight stations consisting of three rivers namely Dhansiri (six stations) and Chathe (one station) at Dimapur District and Dzu (one station) at Kohima District on quarterly basis.

 

Station code with name:

1796– Full Nagarjan, Dimapur

1797– Bridge near Purana Bazaar, Dimapur

1798– Near Check Gate (Dimapur-Khutkhuti Road), Dimapur

1799-Town Boundary Bridge (Diphu Road), Dimapur

1800– Nuton Bosti, Dimapur

1928– Dhansiri at Nagaland- Assam Border, Dimapur

1929– Chathe at Medziphema, Dimapur

1930– Dzu D/S Kohima Town

 

FIELD OBSERVATION STATION CODE
1796 1797 1798 1799 1800 1928 1929 1930
pH 8.0 7.7 8.0 8.0 7.0 8.0 8.2 8.5
Conductivity (µS/cm) 256 227 288 201 249 331 161 517
Turbidity (NTU) 21.2 10.4 11.7 48.1 15.1 14.4 69.5 10.6
Total Dissolved Solids (mg/l) 137 160 159 100 158 186 93 289
Colour (hazen) 15 17 17 60 40 25 45 12
Total Suspended Solids(mg/l) 0.14 0.13 0.11 0.13 0.11 0.09 0.08 0.09
Chemical Oxygen Demand (mg/l) 150 164 164 162 170 162 150 155
Dissolved Oxygen (mg/l) 3.9 3.9 4.1 4.4 3.6 3.9 3.9 4.6
BOD (mg/l) 9.2 9.0 11.0 9.5 24.5 13 11.3 11.0
Total Kjeldahl Nitrogen (mg/l) 0.05 0.11 0.11 0.05 0.11 0.11 0.05 0.11
Ammonia- Nitrogen (mg/l) 0.04 0.05 0.14 0.04 0.64 0.29 0.11 0.05
Nitrate- Nitrogen (mg/l) 0.95 0.08 2.10 1.50 11.7 4.8 1.35 1.35
Phenolpthalien Alkalinity (mg/l) 1 0 0 00 0 0 1 10
Total Alkalinity (mg/l) 66 59 50 51 59 56 23 77
Total Hardness (mg/l) 65 63 67 44 68 63 35 123
Calcium Hardness (mg/l) 29 32 31 19 34 32 15 47
Magnesium Hardness (mg/l) 8.77 7.56 8.78 6.10 8.29 7.55 6.10 18.54
Fluoride (mg/l) 0.39 0.50 0.68 0.62 0.35 0.57 0.48 0.51
Boron (mg/l) 0.12 0.12 0.10 0.12 0.11 0.15 0.11 0.12
Iron (mg/l) 0.18 0.18 0.17 1.06 0.55 0.20 0.30 0.18
Sulphate (mg/l) 45 47 35.5 37.5 27.5 73 53 45.5
Zinc (mg/l) 1.14 0.85 0.80 1.05 1.90 1.55 1.15 1.35
Phosphate (mg/l) 1.0 1.0 0.7 4.0 3.0 0.7 2.6 1.0
Chloride (mg/l) 5.35 7.05 9.45 4.65 21.60 15.40 7.1 19.10
Potassium (mg/l) 4.3 4.6 6.1 4.05 15.54 6.2 6.05 5.0
Cadmium (mg/l) 0.03 0.07 0.47 0.11 0.02 0.07 0.30 0.05
Copper (mg/l) 0.03 0.11 0.10 0.29 0.15 0.16 0.42 0.05
Nickel (mg/l) 0.08 0.15 0.10 0.50 0.32 0.25 0.44 0.10
Lead (mg/l) 0.08 0.10 0.15 0.40 0.40 0.15 0.85 0.35
Chromium (mg/l) 0.29 0.25 0.25 0.20 0.35 0.1 0.35 0.10