What are the 5 ways of preventing waterborne diseases?
Every Single Case Is Preventable
A child misses school. A parent misses work. A family spends thousands on medical bills.
All because of something that came out of a tap.
Waterborne diseases – cholera, typhoid, dysentery, giardiasis – are among the most common illnesses in Kenya. They spread through contaminated water. And they are almost entirely preventable.
Not complicated. Not expensive. Not mysterious.
Just five proven ways to stop waterborne diseases before they start.
This guide walks you through each one – from simple household habits to professional water treatment systems that protect entire schools, institutions, and communities.
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The Scale of the Problem in Kenya
Common waterborne diseases in Kenya:
| Disease | Cause | Symptoms | At-risk settings |
|---|---|---|---|
| Typhoid | Bacteria (Salmonella typhi) | Prolonged fever, diarrhoea, weakness | Schools, boarding houses, crowded estates |
| Cholera | Bacteria (Vibrio cholerae) | Severe watery diarrhoea, dehydration | Informal settlements, refugee camps |
| Dysentery | Bacteria or amoeba | Bloody diarrhoea, fever, cramps | Daycares, schools, institutions |
| Giardiasis | Parasite (Giardia) | Explosive diarrhoea, gas, stomach cramps | Childcare centres, wells, boreholes |
| Cryptosporidiosis | Parasite (Cryptosporidium) | Watery diarrhoea, dehydration | Resistant to chlorine – needs filtration |
Why prevention matters: One outbreak in a school can shut it down for weeks. One contaminated borehole can affect thousands. Prevention is cheaper than cure – in money, time, and human suffering.
The 5 Proven Ways to Prevent Waterborne Diseases
Way 1: Source Protection – Stop Contamination Before It Starts
The first and most effective prevention is keeping contaminants out of water sources in the first place.
For boreholes and wells:
- Locate boreholes away from septic tanks, latrines, and livestock areas (minimum 30 metres)
- Ensure well casings are sealed and raised above ground level
- Prevent surface runoff from entering the borehole
- Regularly inspect for cracks or damage
For rainwater harvesting:
- Clean gutters and roofs before rainy season
- First-flush diverters remove initial dirty water
- Cover tanks to prevent mosquito breeding and algae growth
For city water storage:
- Clean storage tanks every 6 months
- Ensure tanks are covered and dark (prevents algae)
- Check for cracks where contaminants could enter
Limitations of source protection: Even the best-protected source can become contaminated. That is why you need additional barriers.
Way 2: Boiling – The Traditional Fallback
Boiling is the oldest water treatment method. It kills bacteria, viruses, and parasites.
How to do it properly:
- Bring water to a rolling boil for at least 1 minute (3 minutes at high altitudes)
- Let it cool in a covered container
- Store in clean, covered containers
Advantages:
- 100% effective against biological contaminants
- No chemicals
- Works with any water source
Disadvantages for schools and institutions:
- Impractical for hundreds of students
- Expensive fuel costs (Ksh 30,000–60,000 per year for a school)
- Time-consuming
- Does not remove heavy metals, chemicals, or bad taste
Best for: Emergency situations, very small households, or as a backup. Not practical for schools, institutions, or portable water refill business in Kenya operations.
Way 3: Chlorination – Chemical Disinfection
Chlorine kills bacteria and viruses effectively. It is cheap and widely available.
How to do it properly:
- Use liquid chlorine, chlorine tablets, or bleach (unscented)
- Follow dosage instructions carefully (too little = ineffective; too much = bad taste)
- Wait 30 minutes after adding chlorine before drinking
Advantages:
- Cheap
- Works at scale (city water treatment)
- Leaves residual protection in pipes
Disadvantages:
- Does not kill some parasites (Cryptosporidium, Giardia are chlorine-resistant)
- Bad taste and smell (students refuse to drink)
- Requires correct dosage – too little fails, too much is unpleasant
- Does not remove heavy metals or chemicals
Best for: Large municipal systems and emergency response. Not ideal for daily school drinking water due to taste issues.
Way 4: Filtration – Physical Removal of Contaminants
Filtration physically removes contaminants by passing water through a barrier with tiny pores.
Types of filters for disease prevention:
| Filter type | Pore size | Removes bacteria? | Removes viruses? | Removes parasites? |
|---|---|---|---|---|
| Sediment filter | 5–50 microns | No | No | No |
| Carbon filter | Varies | No | No | No (but absorbs chemicals) |
| Microfiltration (MF) | 0.1–10 microns | Partial | No | Yes |
| Ultrafiltration (UF) | 0.01–0.1 microns | Yes | Partial | Yes |
| Reverse osmosis machine (RO) | 0.0001 microns | Yes | Yes | Yes |
For disease prevention, microfiltration, ultrafiltration, or reverse osmosis are required.
Advantages of RO for schools and institutions:
- Removes 99% of all contaminants – bacteria, viruses, parasites, heavy metals, chemicals
- Produces great-tasting water (students drink more)
- Consistent, reliable, chemical-free
- Can be scaled from small daycares to large boarding schools
Disadvantages:
- Higher upfront cost
- Requires electricity
- Wastes some water (2–4 litres per litre produced)
Best for: Schools, institutions, portable water refill business in Kenya, and any setting where reliable, great-tasting, disease-free water is needed daily.
Way 5: UV Treatment – Light-Based Disinfection
Ultraviolet (UV) treatment uses UV light to neutralise bacteria, viruses, and parasites. The light damages their DNA so they cannot reproduce or infect.
How it works: Water flows past a UV lamp inside a sealed chamber. The UV light penetrates microorganisms and destroys their genetic material.
Advantages:
- Kills 99.99% of bacteria, viruses, and parasites
- No chemicals – water tastes natural
- No water waste
- Fast – treats water as it flows
Disadvantages:
- Requires electricity
- Does not remove heavy metals, chemicals, taste, or sediment (needs pre-filters)
- Water must be clear (turbid water blocks UV)
- UV lamp must be replaced annually
Best for: Schools with already-clean water (low TDS, no heavy metals) that only need biological protection. Often combined with sediment and carbon pre-filters.
The Complete Prevention Strategy – Combining Methods
No single method is perfect. The most effective prevention combines multiple barriers.
For a Kenyan school or institution, the ideal combination is:
- Source protection – Keep contaminants out of your borehole or city storage tank.
- Sediment + carbon pre-filtration – Removes dirt and chlorine that would clog downstream equipment.
- UV treatment or reverse osmosis – Primary disinfection (kills or removes all pathogens).
- Clean storage and dispensing – Prevent recontamination after treatment.
- Regular testing – Verify that the system is working.
Example – A boarding school with borehole water:
| Barrier | Technology | What it stops |
|---|---|---|
| Source protection | Sealed borehead, no nearby latrines | Sewage, surface runoff |
| Pre-filtration | Sediment + carbon filter | Sand, rust, chlorine |
| Disinfection | Reverse osmosis machine or UV | Bacteria, viruses, parasites |
| Safe storage | Covered stainless steel tank | Algae, insects, dust |
| Regular testing | Monthly bacterial test | Early warning of failure |
This five-barrier approach is what House of Maji designs for schools, institutions, and refill businesses.
Why Schools, Institutions, and NGOs Must Prioritise Prevention
For primary and secondary schools:
- Young children are most vulnerable to dehydration from diarrhoea
- Outbreaks spread quickly through classrooms and dormitories
- Absenteeism affects learning and school funding
- Parents choose schools with clean water
For boarding schools:
- Students are on site 24/7 – no “safe” tap at home
- Outbreaks can shut down the school for weeks
For universities and colleges:
- Thousands of students, plus staff, plus visitors
- A campus-wide whole house water purification system protects every building
For hospitals and clinics:
- Vulnerable patients cannot tolerate contaminated water
- Sterilisation requires pure water
- A water treatment system is not optional – it is a regulatory requirement
For NGOs and humanitarian organisations:
- Serving displaced or vulnerable populations
- A community-scale water treatment system can transform health outcomes
- Containerised reverse osmosis machines work in remote areas
For daycares and kindergartens:
- Small children have developing immune systems
- Even mild diarrhoea is dangerous for toddlers
- A small reverse osmosis machine or UV system protects the most vulnerable
For children’s homes and orphanages:
- Full-time residential care for vulnerable children
- Water quality is a non-negotiable safeguarding issue
The Cost of Prevention vs. The Cost of Disease
| Scenario | Estimated cost |
|---|---|
| Prevention: Install a commercial reverse osmosis machine for a school of 400 students | Ksh 300,000 – 500,000 (one-time) |
| Prevention: Annual maintenance (filters, servicing) | Ksh 30,000 – 80,000 |
| Disease: Treating a typhoid outbreak in a school of 400 (medical costs, lost learning, reputational damage) | Ksh 200,000 – 1,000,000+ per outbreak |
| Disease: One child hospitalised with severe diarrhoea | Ksh 10,000 – 50,000 |
The maths is clear: Prevention is cheaper – and it prevents suffering.
Why House of Maji Is the Best Water Treatment Company for Preventing Waterborne Diseases
1. They Start with Certified Water Analysis – Find the Hidden Threats
You cannot prevent what you have not measured. House of Maji begins every project with certified water analysis – scientific testing of physical, chemical, and microbiological properties. They will tell you exactly what diseases or contaminants you are at risk for.
2. They Design Systems That Remove or Neutralise Pathogens
House of Maji supplies reverse osmosis machines (which remove 99% of all pathogens) and UV systems (which neutralise 99.99% of bacteria and viruses). They will recommend the right water treatment system for your specific water quality and risk profile.
3. They Have Installed Systems in 15+ Schools and 44+ Refill Businesses
Our track record: 15 schools, 44+ refill businesses, 97+ homes, 12+ hotels, and hospitals. They have real, local experience preventing waterborne diseases in Kenyan settings.