Water Tank Cleaning Services: What's Included and When to Hire One

Stored water goes stale faster than most homeowners expect. Sediment settles, biofilm creeps up the walls, and an algae bloom can take hold in a matter of weeks if conditions are right. A professional water tank cleaning service exists to deal with exactly this — methodically, with the right equipment and approved disinfectants. This guide explains what the service should cover, how often to schedule one and what drives the price, so you can make a straightforward decision.

What a Professional Clean Actually Covers

A reputable service follows a consistent sequence, regardless of whether you have a JoJo tank, a concrete reservoir or a steel tank.

1. Isolation and draining. The inlet is closed and the tank is pumped down to near-empty. Responsible operators either pump the water to your garden (if it is safe to do so) or arrange appropriate disposal — never straight to stormwater drains.
2. Sludge and sediment removal. The gritty layer that collects at the bottom — a mix of soil particles, rust from fittings and organic matter — is vacuumed or scooped out manually.
3. Internal scrubbing. Walls, floor and any internal baffles are scrubbed with brushes or pressure-washing equipment to dislodge biofilm and algae. For more on why algae is a recurring problem, see algae in water tanks.
4. Disinfection. A food-grade disinfectant — usually a chlorine-based solution at a concentration consistent with SANS 241 (2024 edition) guidelines — is applied and allowed to dwell for the period specified by the manufacturer or the water authority’s guidance.
5. Rinse and flush. The disinfectant is flushed out thoroughly before refilling, because residues at the wrong concentration can themselves be a health concern.
6. Refill and reinstatement. Inlets are reopened, any inspected fittings are noted and the customer is told of anything that needs attention — a cracked lid, a corroded outlet, a float valve that needs replacing.

Some operators also carry out a basic water quality check at the end, though a full SANS 241-compliant laboratory test is a separate service you may want to add on.

JoJo Tank Cleaning Services: Any Difference?

The brand name JoJo has become almost generic for polyethylene vertical tanks in South Africa, so “JoJo tank cleaning services” is often just shorthand for the standard residential clean. Polyethylene tanks are relatively straightforward: they are smooth internally, light enough for one technician to work around and do not corrode. The process is the same as above. The main practical note is that the access opening on smaller poly tanks can be narrow, which limits the tools a technician can get inside — reputable operators account for this when quoting.

For ongoing care between professional visits, keep the lid sealed and inspect it regularly. You can also do a basic internal check yourself; the water tank maintenance checklist walks through what to look for.

How Often Should You Book a Clean?

The honest answer is: it depends on your setup and water source. As a working guide:

• Six-monthly if you use the tank for drinking or cooking, or if your supply is municipal water with any sediment issues.
• Annually for tanks used only for garden irrigation or toilet flushing, provided the tank is in shade and well-sealed.
• Immediately if you notice any of the following: discolouration, a musty or sulphurous smell, visible slime on the walls, an unexplained change in taste, or if the tank has been sitting unused for more than three months.

After a flood event or a period of poor municipal water quality, a full clean and disinfection is advisable before you use the stored water again.

For the routine work you can do yourself between professional cleans — rinsing inlets, checking seals, wiping down the outside — the guide to cleaning a water tank covers the practical steps.

What Drives the Price?

Tank cleaning prices in South Africa are not standardised, and they vary significantly. The main cost drivers are:

Factor	Why it matters
Tank size and volume	More water to pump out, more surface to scrub, more disinfectant used
Number of tanks	Some operators offer a per-tank discount for multiple units on the same visit
Condition	Heavy sludge build-up, severe biofilm or algae takes considerably longer
Access	Underground tanks, tanks in confined spaces or tanks with small hatches cost more
Location	Travel costs are real; urban areas with more operators tend to be more competitive
Add-ons	Water quality testing, fitting replacement or a report for insurance purposes all add to the bill

As a Johannesburg reference point, complete borehole systems (a different but related investment) run R40,000–R150,000, with tank-and-pump backup systems typically R20,000–R40,000. Tank cleaning services sit well below these figures, but quoting a specific cleaning price here would be misleading — the range is wide. Get at least three itemised quotes and compare what each one includes.

If you're investing in a clean, it's worth making sure the rest of your backup system is properly set up too. Compare 3 free quotes — vetted installers, no obligation.

Signs You Need a Service Now, Not Later

Homeowners often put off tank maintenance until something goes visibly wrong. These are the signs that push it from “soon” to “now”:

• Brown or grey water from the tank outlet, even briefly after the pump starts.
• Slippery internal walls visible through the inspection hatch — that is biofilm.
• Floating particles in a sample drawn from the tank.
• Family members experiencing unexplained gastric illness and the tank is the common water source.
• Tank unused for a school holiday, extended travel or a building renovation — stagnant water stratifies and bacteria multiply rapidly without the normal throughput.

None of these is cause for panic, but each is a clear prompt to act.

Choosing a Reputable Operator

The water tank cleaning market in South Africa includes everything from well-equipped professional teams to informal operators with a bucket and a hose. A few things to check:

• Do they specify the disinfectant and dwell time? If they cannot tell you what chemical they use and how long it sits, walk away.
• Do they provide a written record? A date-stamped service record matters for insurance and for tracking your maintenance history.
• Are they familiar with SANS 241? This is the national drinking-water quality standard. Operators working on potable water tanks should know it.
• Do they carry appropriate insurance? Damage to a tank or contamination of a water supply can be costly.
• Do they offer any post-clean water test? Not obligatory, but a useful extra for tanks used for drinking.

The Water Research Commission (wrc.org.za) publishes technical guidance on water quality and storage that underpins best practice in the sector — it is worth knowing it exists if you want to scrutinise an operator’s methods.

For a broader look at how tank cleaning fits into a complete backup water strategy, the backup water systems section of this site covers storage, pumping and supply options in one place.

Ready to find a reliable tank cleaning operator in your area? Get up to 3 no-obligation quotes from vetted local professionals.

The Short Version

A professional water tank cleaning service should drain, scrub, disinfect and refill — nothing less. For most households, once or twice a year is right, with immediate action if water quality changes. Price is driven by tank size, condition and access, so itemised quotes from multiple operators are the only reliable way to compare. A clean, well-maintained tank is one of the simplest things you can do to make your backup water supply actually safe to use.