Why Water Quality Testing Matters
Drilling a successful borehole is only half the journey. The water you extract must be safe for its intended use—whether that's drinking, irrigation, livestock, or industrial processing. At WaterLink Limited, a WRA licensed borehole drilling company with Class A status, we recommend comprehensive water quality testing for every borehole we drill.
In Kenya, groundwater quality varies significantly by region. Areas like Kajiado and parts of Machakos are known for high fluoride levels, while coastal regions may have salinity issues. Testing ensures you know exactly what's in your water and what water treatment, if any, is needed.
Critical Warning: Water that looks clean can still contain harmful bacteria, high fluoride, or heavy metals. Never assume your borehole water is safe without testing.
Common Water Quality Issues in Kenyan Boreholes
Different regions of Kenya present different water quality challenges:
High Fluoride
Common in the Rift Valley and parts of Kajiado, Machakos, and Nakuru. Excessive fluoride causes dental and skeletal fluorosis. The KEBS limit is 1.5 mg/L.
High Salinity / Total Dissolved Solids (TDS)
Common in coastal areas and parts of Eastern Kenya. High TDS affects taste and can damage irrigation systems and appliances.
Iron and Manganese
Common in volcanic regions (Nairobi, Kiambu, Kajiado). Causes staining of laundry and fixtures, and can affect taste.
Bacterial Contamination
Can occur anywhere, especially in poorly constructed or maintained boreholes. E. coli and coliform bacteria indicate fecal contamination.
Hard Water (High Calcium and Magnesium)
Common in many areas. Causes scale buildup in pipes and appliances, reducing efficiency and lifespan.
Nitrates
Often from agricultural runoff or septic systems. High nitrates are dangerous for infants and pregnant women.
Heavy Metals
Arsenic, lead, mercury, and other heavy metals can occur naturally or from industrial pollution. They are toxic even at low levels.
Regional Note: Water quality varies significantly by region. A professional water test tells you exactly what's in your water.
Essential Water Quality Parameters to Test
Not all water tests are equal. Here are the essential parameters for Kenyan boreholes:
Bacteriological Tests
- Total Coliforms: Must be 0 per 100ml for drinking water.
- E. coli: Must be 0 per 100ml for drinking water.
- Heterotrophic Plate Count (HPC): Indicator of general bacterial activity.
Physical Tests
- Turbidity: Clarity of water (should be less than 5 NTU).
- Color: Should be clear, not yellow or brown.
- Taste and Odor: Should be pleasant, not metallic or musty.
Chemical Tests
- pH: Should be between 6.5 and 8.5.
- Total Hardness: Ideal range 100-300 mg/L as CaCO3.
- Fluoride: Should be less than 1.5 mg/L.
- Iron: Should be less than 0.3 mg/L.
- Manganese: Should be less than 0.1 mg/L.
- Nitrates (as NO3): Should be less than 50 mg/L.
- Chlorides: Should be less than 250 mg/L.
- Sulfates: Should be less than 250 mg/L.
Heavy Metals
- Arsenic: Should be less than 0.01 mg/L.
- Lead: Should be less than 0.01 mg/L.
- Mercury: Should be less than 0.001 mg/L.
- Cadmium: Should be less than 0.003 mg/L.
WaterLink Recommendation: We recommend at least bacteriological + basic chemical testing for all boreholes, and comprehensive testing for drinking water.
Kenyan Drinking Water Standards (KEBS)
The Kenya Bureau of Standards (KEBS) sets the following limits for drinking water (KS EAS 12:2014):
| Parameter | Maximum Allowable Limit |
|---|---|
| pH | 6.5 – 8.5 |
| Turbidity | Less than 5 NTU |
| Total Hardness | Less than 500 mg/L |
| Fluoride | Less than 1.5 mg/L |
| Iron | Less than 0.3 mg/L |
| Manganese | Less than 0.1 mg/L |
| Nitrates (as NO3) | Less than 50 mg/L |
| Chlorides | Less than 250 mg/L |
| Total Coliforms | 0 per 100ml |
| E. coli | 0 per 100ml |
| Arsenic | Less than 0.01 mg/L |
| Lead | Less than 0.01 mg/L |
Source: Kenya Bureau of Standards (KEBS) KS EAS 12:2014
Where to Get Water Testing in Kenya
WaterLink Limited works with accredited laboratories across Kenya. Here are some options:
Government Chemist
📍 Nairobi
Official government testing laboratory
Comprehensive chemical and bacteriological testing
Kenya Bureau of Standards (KEBS)
📍 Nairobi
National standards body
Accredited testing for all parameters
University of Nairobi – Geology Dept
📍 Nairobi
Hydrogeological and chemical analysis
Good for research-grade testing
Private Accredited Laboratories
📍 Various locations
Several private labs offer comprehensive testing
Fast turnaround times available
WaterLink Limited can arrange testing through our partner laboratories and provide interpretation of results.
Cost of Testing: Basic potability test: KES 5,000 – 10,000. Comprehensive analysis: KES 15,000 – 30,000. Full chemical + bacteriological: KES 20,000 – 40,000.
Water Treatment Options by Contaminant
Based on your test results, WaterLink Limited can design and install appropriate treatment systems:
Sediment & Turbidity
Solutions: Sediment filters, sand separators, cartridge filters.
Cost: KES 20,000 – 100,000
Bacteria
Solutions: UV sterilization, chlorination, ozone treatment.
Cost: KES 30,000 – 150,000
Fluoride
Solutions: Activated alumina filters, reverse osmosis.
Cost: KES 80,000 – 300,000
Iron & Manganese
Solutions: Oxidation filters, greensand filtration.
Cost: KES 50,000 – 200,000
Hard Water
Solutions: Water softeners (ion exchange).
Cost: KES 60,000 – 250,000
High TDS / Salinity
Solutions: Reverse osmosis systems, deionization.
Cost: KES 150,000 – 500,000+
Note: Costs vary based on system size and specific requirements. WaterLink Limited provides tailored treatment solutions.
When to Test Your Borehole Water
Regular testing ensures your water remains safe and identifies problems early:
- Initial Testing: Immediately after drilling and pump installation.
- Annually: Recommended for residential boreholes (basic potability test).
- Quarterly: Recommended for commercial, agricultural, and institutional systems.
- After Heavy Rains: Surface contamination can enter boreholes after flooding.
- If Water Quality Changes: Any change in taste, color, odor, or clarity.
- After Repairs: Following any pump or casing repairs.
- If You Suspect Contamination: Agricultural runoff, industrial pollution, or septic system issues.
WaterLink Recommendation: Test your borehole water at least once a year. For drinking water, test for bacteriological contamination every 6 months.
How WaterLink Limited Can Help
WaterLink Limited offers comprehensive water quality services:
- Sample Collection: We collect water samples using sterile techniques.
- Laboratory Testing: We work with accredited labs for reliable results.
- Results Interpretation: We explain what your results mean in plain language.
- Treatment Design: We design custom treatment systems based on your specific water quality issues.
- Installation: We install and commission all treatment systems.
- Ongoing Monitoring: We provide regular testing and system maintenance.