Research Article
Assessment of Groundwater Quality Using Water Quality Index from Selected Springs in Manga Subcounty, Nyamira County, Kenya
Table 2
Parameter characterization, recommended standards, and agency.
| Parameter | Unit | SP1 | SP2 | SP3 | Standard error | Standard | Reference agency [39, 40] |
| pH | pH scale | 5.7 | 5.1 | 5.4 | 0.173 | 6.5–8.5 | WHO/KEBS | Turbidity | N-T-U | 0.9 | 0.84 | 1.05 | 0.0624 | Max 5 | WHO/KEBS | Nitrate | mgNO3/l | 0.68 | 0.88 | 1.2 | 0.151 | Max 10 | WHO/KEBS | Phosphate | mg/l | 0.14 | 0.24 | 0.08 | 0.0467 | Max 30 | KEBS | Calcium | mg/l | 8 | 6 | 9 | 0.882 | Max 150 | KEBS | Magnesium | mg/l | 1.2 | 0.9 | 0.67 | 0.153 | Max 100 | WHO/KEBS | Chloride | mg/l | 3 | 2 | 1 | 0.577 | Max 250 | WHO/KEBS | Fluoride | mg/l | 0 | 0 | 0 | 0.000 | Max 1.5 | WHO/KEBS | Sulphate | mg/l | 4 | 2 | 2 | 0.667 | Max 400 | KEBS | Iron | mg/l | 0 | 0 | 0 | 0.000 | Max 0.3 | WHO/KEBS | Total phosphorous | mg/l | 0.28 | 0.36 | 0.16 | 0.0581 | Max 2 | WHO | Total hardness | mgCaCO3/l | 10 | 8 | 10 | 0.667 | Max 300 | KEBS | Total alkalinity | mgCaCO3/l | 20 | 17 | 20 | 1.000 | Max 500 | WHO | TDS | mg/l | 25 | 22 | 23 | 0.882 | Max 1000 | KEBS | Coliforms | Colonies/100 ml | 0 | 0 | 0 | 0.000 | 0 | WHO/KEBS |
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