Stored water doesn’t stay clean on its own. Sediment settles at the bottom, algae can develop in tanks exposed to light, and biofilm builds up on interior walls over time — all of which affect water quality even when the source itself is safe. Water tank cleaning is a maintenance task property owners often overlook until discoloured or odorous water forces the issue. Bestcare Facilities Management Services provides thorough, scheduled water tank cleaning for homes, estates, and commercial buildings across Nairobi.
What our water tank cleaning services include:
- Full draining and sediment removal
- Interior scrubbing to remove algae and biofilm
- Disinfection using safe, approved sanitising agents
- Thorough rinsing before refilling
- Structural inspection for cracks or leaks
- Post-clean water quality testing
Water Tank Cleaning Process
| Step | What Happens | Why It Matters |
|---|---|---|
| Draining | Tank fully emptied and sediment removed | Clears settled debris and contaminants |
| Scrubbing | Interior walls and floor scrubbed by hand | Removes algae, biofilm, and mineral buildup |
| Disinfection | Approved sanitiser applied and left to act | Eliminates bacteria and pathogens |
| Rinsing | Multiple rinse cycles before refilling | Removes disinfectant residue |
| Inspection | Check for cracks, corrosion, or fitting damage | Prevents leaks and future contamination |
| Water Testing | Sample testing after refill | Confirms water is safe for use |
“A tank that looks clean from the outside can still be harbouring a layer of sediment and biofilm inside — the only way to know is to open it up and check.”
1. Draining and Sediment Removal
The first step in any water tank cleaning job is a complete drain-down, followed by manual removal of settled sediment from the tank floor. This sediment layer, often invisible from the inlet or outlet pipes, is where the bulk of contamination risk accumulates over months of use.
2. Interior Scrubbing
Once drained, our technicians scrub the tank’s interior walls and base to remove algae growth, biofilm, and mineral scale — particularly common in tanks with any light exposure or those supplied with harder borehole water.
“Algae doesn’t need much light to establish itself inside a tank — even a small gap around a lid or vent is often enough over a full year.”
3. Disinfection
After scrubbing, we apply a safe, approved disinfecting agent to eliminate bacteria and other pathogens that may be present on tank surfaces. The disinfectant is left to act for the required contact time before being fully rinsed out.
4. Rinsing and Refilling
Multiple rinse cycles ensure no disinfectant residue remains before the tank is refilled. This step is critical — skipping it or rushing it is one of the most common mistakes in DIY tank cleaning attempts.
5. Structural Inspection
While the tank is empty, we inspect for cracks, corrosion, damaged fittings, or compromised lids and vents that could allow contaminants or pests to enter going forward. Any issues identified are flagged for repair before the tank returns to service.
6. Post-Clean Water Testing
For clients who want documented assurance, we can arrange water quality testing after refilling to confirm the tank is delivering clean, safe water — particularly useful for schools, healthcare facilities, and hospitality businesses with compliance obligations.
Who Needs Water Tank Cleaning Services
| Client Type | Recommended Frequency |
|---|---|
| Residential Homes | Every 6–12 months |
| Apartment Blocks | Every 6 months |
| Schools & Institutions | Every 3–6 months |
| Hotels & Restaurants | Every 3–6 months |
| Hospitals & Clinics | Quarterly, with water testing |
| Offices & Commercial Buildings | Every 6–12 months |
“Water tank cleaning shouldn’t be a reactive decision made after someone complains about the taste. On a fixed schedule, it’s cheap insurance against a genuinely serious health risk.”
Indicative Water Tank Cleaning Costs
| Tank Size | Indicative Price Range (KES) |
|---|---|
| Up to 2,000L | 3,500 – 6,000 |
| 2,000L – 5,000L | 6,000 – 10,000 |
| 5,000L – 10,000L | 10,000 – 16,000 |
| Above 10,000L | 16,000 – 30,000+ |
| Water Quality Testing (add-on) | 4,000 – 8,000 |
Pricing depends on tank size, accessibility, and whether the tank is elevated or underground, since underground and rooftop tanks require additional access equipment.
“Cleaning cost is a fraction of what a genuine water contamination incident costs — in health impact, reputation, and in some cases regulatory penalties for institutions with compliance obligations.”
Frequently Asked Questions
How do I know if my tank needs cleaning? Visible sediment, discolouration, an odd smell or taste, or simply reaching the recommended interval since the last clean are all clear signals. For institutions, water testing is the more objective trigger.
Is it safe to clean a tank while the property is occupied? Yes — we typically schedule cleaning to minimise disruption, and can arrange temporary storage or supply arrangements for properties that can’t be without water even briefly.
Do you clean both underground and rooftop tanks? Yes, our teams are equipped to access and clean tanks regardless of position, including confined-space underground tanks that require specific safety protocols.
Bestcare Facilities Management Services builds water tank cleaning into our broader facility maintenance contracts, or handles it as a standalone service for clients who just need it done right, on schedule.
Contact Bestcare Facilities Management Services: 📞 0709 004 600 ✉️ info@bestcareservices.co.ke
Book a water tank cleaning visit today and keep your stored water genuinely safe to use.