Water rationing. Dry taps for days. A bowser at the gate every week. If this sounds like your estate, you are not alone.
More and more Kenyan estates, apartment blocks, schools and churches now solve the problem together. They pool their money, drill one good borehole, and share the water through a tank and pipes. This guide shows you exactly how a shared borehole for estates in Kenya works, step by step.
Who Shares a Borehole?
- Gated estates and residents’ associations
- Apartment blocks and their management companies
- Schools and colleges with boarding and staff houses
- Churches and mosques serving members and the community
- Hospitals and clinics that cannot afford dry taps
- Self help groups and neighbours on farms
Nairobi alone has about 4,000 registered boreholes, and many serve estates in areas such as Embakasi, Karen, Langata and Loresho, as Kenyans.co.ke reported.
Why Sharing Makes Sense
Every borehole has fixed costs: the survey, the permits, moving the rig to site, and test pumping. When 40 homes share them instead of one, each home pays a small slice.
Take the survey. With Bonvic Drilling it costs KES 50,000. Split across 40 homes, that is just KES 1,250 per home.
Meanwhile, piped water keeps getting dearer. In August 2026 WASREB approved new tariffs for several towns. Residential water in Kitui now starts at KSh 198 per cubic metre, and Sibo in Nairobi starts at KSh 162, according to Kenyans.co.ke. Once a shared borehole is running, members mostly pay for power and upkeep.
How One Borehole Serves Many Homes
The pump lifts water into an elevated tank. Gravity then pushes it along a main line to every member. A meter at each connection keeps billing fair. Read why the water tower matters so much for steady pressure.
How Much Water Does Your Estate Need?
Start with a simple sum. For planning, many estates assume about 500 to 1,000 litres per home per day. Use the middle figure of 750 litres to begin.
| Members | Daily need (750 L each) | Pump hours at 3 m³ per hour |
|---|---|---|
| 20 homes | 15,000 L (15 m³) | 5 hours |
| 40 homes | 30,000 L (30 m³) | 10 hours |
| 80 homes | 60,000 L (60 m³) | 20 hours |
| School with 500 learners (illustrative 20 L each) | 10,000 L (10 m³) | 3.3 hours |
Now compare with yield. Volcanic aquifers in Kenya average about 7.5 cubic metres per hour, while basement rock averages about 4.4, according to the British Geological Survey. A large estate on a weak borehole may need two boreholes or more storage. Our pump and tank calculator helps you size both.
Step by Step: How to Drill a Shared Borehole
1. Form a water committee
Pick a small team: a chair, a treasurer and a secretary. They speak for everyone, collect money and deal with the contractor.
2. Agree on members and contributions
Write down who is joining and how costs will be split. Put it in signed minutes. This one step prevents most future fights.
3. Do a hydrogeological survey
The survey finds the best drilling point and gives the expected depth and yield. Check typical depths for your area in our borehole depth by county guide.
4. Get the permits
You need authorisation from the Water Resources Authority (WRA) before drilling. WRA groups water use into categories A to D. Category A covers social and basic needs, while B, C and D are economic uses where the user pays for the water used, as explained on the WRA water allocation page. A shared supply may fall into a higher category than a single home, and metering is often required. The rules sit in the Water Resources Regulations, 2021. Our borehole permits guide walks you through it, and we handle the paperwork for our clients.
5. Drill, case and develop
The rig drills to the target depth. Casing, screens and a gravel pack keep the hole open and the water clean.
6. Test pump
Test pumping is critical for shared boreholes. It tells you the safe yield, so the pump is never too big for the borehole.
7. Equip the system
Install the pump, the tank and tower, the main line and the meters. In areas with costly or unreliable power, a solar pump system cuts the monthly bill sharply.
8. Test the water and hand over
Get a lab test before anyone drinks the water. See our guide to water testing labs and prices.
How to Split the Cost Fairly
| Method | How it works | Best for |
|---|---|---|
| Equal shares | Every member pays the same | Similar homes, such as one estate design |
| By house size | Bigger homes pay a bigger share | Mixed estates |
| By expected use | Shares follow planned daily use | Schools, churches and businesses on one system |
| Meter plus levy | Members pay for metered water plus a fixed monthly levy | Running costs after drilling |
Most estates use equal or size based shares to build the borehole, then meters plus a levy to run it.
Not every member can pay at once. With our staged plan, the committee deposits into our account over time. Once three quarters of the project cost is paid, we start work, and the balance is paid at the same pace over an agreed period. Read more in how to pay for a borehole in Kenya.
Running the Borehole After Handover
- Monthly levy: covers power, a repair fund and water testing.
- Meter readings: record them monthly and share the figures with members.
- Maintenance fund: pumps and controllers wear out. Save for them.
- Water tests: test at least once a year, and after any change in taste or colour.
- One contact: give your contractor one committee number to call.
Book regular servicing through our borehole maintenance team so small faults never become big repairs.
Common Mistakes Estates Make
- No written agreement on shares and rules.
- Skipping the survey to save money, then drilling a weak or salty hole.
- Fitting a pump too big for the yield, which damages the borehole.
- No repair fund, so a pump failure leaves everyone dry.
- Drilling too close to another borehole. Check the borehole spacing rules first.
Residents’ Meeting Checklist
✅ Take this to your next meeting
- How many homes or users will join?
- Who sits on the water committee?
- How will we split the build cost?
- Will we pay at once or in stages?
- Where can the borehole and tank sit?
- Do we want solar or mains power?
- Who will read meters and keep records?
- When do we book the survey?
Frequently Asked Questions
How much does a shared borehole cost per household in Kenya?
It depends on depth, equipment and how many homes join. Fixed costs are shared, so the cost per home falls as more homes join. For example, our KES 50,000 survey costs just KES 1,250 per home when 40 homes share it.
Do we need a permit for an estate borehole?
Yes. You need WRA authorisation before drilling, and shared or commercial use may fall into a higher permit category with metering. We handle the permits for our clients.
How many homes can one borehole serve?
It depends on the yield. At 750 litres per home per day, a borehole giving 3 cubic metres per hour for 10 hours serves about 40 homes. Test pumping confirms the real yield.
Can we pay for an estate borehole in instalments?
Yes. With our staged plan your committee deposits into our account over time. We start once three quarters of the cost is paid, and the balance is paid at the same pace over an agreed period.
Who owns a shared borehole?
The members, through their association or committee. Record ownership, shares and rules in signed minutes or a simple agreement.
Get a Proposal for Your Estate, School or Church
Bonvic Drilling has drilled boreholes across Kenya since 2010, including systems for estates, schools and community groups. We can prepare a proposal your committee can present to members. Contact us or send your location on WhatsApp.
