Understanding Borehole Drilling Costs in Kenya

Borehole drilling is one of the biggest investments a Kenyan homeowner or institution will make in water infrastructure. Yet pricing is often opaque, with wildly different quotes from different drillers. Here's what you should actually expect to pay and why.

Cost Breakdown

1. Hydrogeological Survey (KES 15,000 - 40,000)

Before drilling, a hydrogeologist studies your site to determine the best drilling location and expected water depth. This involves:

• Reviewing geological maps and existing borehole data in your area
• Geophysical survey (resistivity or electromagnetic)
• Written report with recommended drilling location and depth

  Don't skip this. A KES 20,000 survey can save you from a KES 500,000 dry borehole.

  2. Drilling (KES 2,500 - 5,000 per metre)

  This is the biggest variable cost. Price per metre depends on:

  Geology:

• Soft formations (clay, sand): KES 2,500-3,500/m
• Medium formations (weathered rock): KES 3,000-4,000/m
• Hard rock (granite, gneiss): KES 4,000-5,000/m

  Depth:

• Nairobi/Central: 100-300m typical
• Coast: 30-80m typical
• Arid North: 100-400m typical

  Access:

• Easy access (flat, open land): standard pricing
• Difficult access (steep terrain, narrow entrance): 10-20% premium

  For a typical 150m borehole in Nairobi's rock formations, drilling alone costs roughly KES 450,000 - 600,000.

  3. Casing and Screen (KES 50,000 - 150,000)

  The borehole needs lining to prevent collapse and contamination:

• uPVC casing (most common): KES 50,000-100,000 for a residential borehole
• Steel casing (for very deep or unstable formations): KES 80,000-150,000
• Includes slotted screens at the water-bearing zones

  4. Gravel Pack and Cement Seal (KES 20,000 - 40,000)

  Gravel pack around the screens filters sand. Cement seal at the top prevents surface water contamination.

  5. Pump Installation (KES 40,000 - 200,000)

  Depends on the pump type and depth:

• Submersible pump (electric): KES 40,000-150,000
• Solar submersible pump (with panels): KES 85,000-350,000
• Includes rising main (pipe), cable, pump chamber, and control panel

  6. Pumping Test (KES 15,000 - 30,000)

  A 24-hour pumping test confirms yield and dynamic water level. Required by WRA for the permit. Non-negotiable.

  7. Water Quality Analysis (KES 5,000 - 12,000)

  Lab testing to confirm the water is safe and determine if treatment is needed.

  8. WRA Permit (KES 5,000 - 10,000)

  The Water Resources Authority requires a permit for all boreholes.

  Total Cost Examples

  Scenario	Depth	Geology	Total Cost
  Nairobi residential	150m	Rock	KES 650,000 - 900,000
  Kiambu residential	120m	Mixed	KES 500,000 - 700,000
  Coastal residential	50m	Sand/coral	KES 250,000 - 400,000
  Institutional (school)	200m	Rock	KES 900,000 - 1,400,000

  Red Flags to Watch For

  - No hydrogeological survey offered. Reputable drillers always recommend a survey.

  • Price per metre seems too low. They may cut corners on casing or use inferior materials.
  • No pumping test included. You need this for the WRA permit and to size your pump correctly.
  • "Guaranteed water" promises. No one can guarantee water. A good survey reduces risk, but geology always has surprises.
  • No written contract. Always get a detailed written quote specifying depth, casing material, and what happens if the borehole is dry.

    How to Save Money

    1. Get the survey first. It costs 2-3% of the total project but prevents the most expensive failure.

  2. Go solar from the start. Retrofitting solar later costs more than installing it during the initial project.
• Size your pump correctly. Our free online configurator helps you avoid oversizing.
• Maintain your system. A well-maintained borehole lasts 30+ years; a neglected one fails in 5-10.