What a plumbing compliance certificate proves is narrow. It says an accredited person inspected specified work and found it met the standard on the day of the inspection. It does not warrant the rest of the building's plumbing, and it is worth exactly as much as the accreditation behind the signature.
That last clause is where most South African clients lose. A certificate is a page. The thing being relied on is the standing of the person who signed it, and that is the part almost nobody checks.
The signature is a claim about authority
Johannesburg Water made the general version of this point on 4 September 2026, and it was not about a plumber at all. Defending its Underground Water Augmentation Pilot Project, the entity set out who may lawfully touch a water system and under what authority.
Section 20 of the City of Johannesburg Metropolitan Municipality Water Services By-laws, 2023 prohibits any person from operating, maintaining, connecting to or interfering with any part of the municipal water supply system. That is without the City's prior written authorisation. Section 22 prohibits unauthorised entry onto municipal water services works. Johannesburg Water put the consequence plainly: anyone who operates, connects to or alters its infrastructure without authority acts unlawfully, and may face enforcement action, prosecution and the cost of repairs.
The line that carries furthest is the one about testing. Claims that water is safe to drink, the entity said, must be supported by appropriate testing through accredited processes and ongoing monitoring.
Read that as the test for any certificate on any building. Who authorised this person, and is the process behind their signature accredited by somebody who can withdraw it?
What accreditation actually looks like
Accreditation is a live status held by a named body, audited, and capable of being lost. It is not a logo on a quotation.
There is a clean example in the same week's news. Conlog opened a new SANAS-accredited laboratory for water metering, and the accreditation is the point of the announcement rather than decoration on it. A meter reading from an accredited laboratory means something a reading from an unaccredited one does not, and the difference is the audit trail behind it.
Apply the same question to the page your plumber hands you. Which body accredits them, is that accreditation current today, and can you check it without asking them? If the answer to the third is no, you are relying on a photocopy.
The three answers, for plumbing
Those questions have names attached in South Africa, and a client can work through all three in about ten minutes.
The standards the work is measured against are SANS 10252 and SANS 10254. If a certificate does not reference the standard it is certifying against, that is the first thing to ask about.
One change catches people out. The revised SANS 10254, gazetted on 24 June 2022, dropped the standard's own requirement for a certificate of compliance on electric geyser work. The PIRB still requires its licensed plumbers to issue a PIRB certificate on all plumbing work they do, geysers included, and insurers and municipalities still ask for one. So a missing certificate on a geyser installed since mid-2022 is a question for the plumber, not proof that anything was unlawful.
The body is the Plumbing Industry Registration Board, the PIRB, which is recognised as a professional body by SAQA and licenses plumbers to issue certificates of compliance. A licensed plumber whose registration is not active cannot obtain or issue one.
The check is the part clients do not know exists, and it is how you check whether a plumber is registered. PIRB runs a verify a plumber search, by name or registration number, so you can check a plumber before they start. The accreditation is held by somebody who can lose it, which is the whole point of checking.
One caution. A municipality can set its own test for who may sign, and the PIRB register does not answer that test for you. Cape Town, below, is the clearest case. Check which register your municipality's by-law actually names before you accept a certificate on the strength of a logo.
When is a plumbing compliance certificate legally required?
In Cape Town it is legally required when a property is sold. Elsewhere it depends on the municipality, and this is where the answer stops being national.
Section 14(1) of the City of Cape Town Water By-law 2010 obliges the seller to submit a certificate of compliance before a property transfers. The by-law has been in force since February 2011. A fresh certificate is needed for each transfer; the one the previous seller obtained does not carry over.
Who may sign it has changed, and older guidance has not caught up. The 2010 wording asked for an "accredited plumber", which many conveyancing and estate agency pages still read as IOPSA membership. Since the 2018 amendment the by-law asks for a registered plumber, meaning one on the City's own register of plumbers. The City's certificate page says the certificate can only be completed by a City of Cape Town registered plumber.
A PIRB licence or IOPSA membership on its own is not that. The conveyancing attorney submits the certificate to the City.
Note what that certificate covers, because it is narrower than "the plumbing". It goes to the water installation. The City lists no defects against the checklist on the day and a water meter that registers. It also lists no stormwater discharging into the sewer, and no cross-connection between drinking water and any greywater, recycled water or groundwater system.
The City's checklist also covers the hot water cylinder against SANS 10252 and 10254. Beyond the stormwater check, it is not a report on your drains.
Outside the City of Cape Town, do not assume the same rule. This is a municipal by-law obligation, not a national one, and the requirement, the wording and the accepted issuer all vary by municipality. Read your own municipality's water by-law, or have the conveyancer tell you in writing what that municipality requires, rather than carrying an assumption from a sale in another city.
The three things the page does not cover
Clients read a plumbing compliance certificate as a clean bill of health for the building. It is nothing of the sort.
It does not cover work outside the scope inspected. A certificate issued after a geyser replacement says something about that installation and nothing about the drainage or the pipework in the rest of the house.
It does not cover anything done after the date. A certificate is a snapshot, and the handyman who moved a line in the kitchen three months later has quietly voided the assumption you were operating on.
It does not stand in for a municipal approval. Those are separate permissions from separate offices, and Johannesburg Water's statement is the clearest recent illustration of how separate. A tradesman's certificate has never authorised a connection.
The R37 million lesson
The Waterworks matter is worth one more paragraph, because it shows what unfinished paperwork does to finished work.
Thirty-nine production and monitoring boreholes had been drilled across the nine locations in that pilot project, as at 4 September 2026. The scheme sat in the final phase of its Water Use Licence application with the Department of Water and Sanitation. DWS had asked for a wetland assessment before it will consider the Waterworks application, because the area has wetland characteristics. Until that completes, Johannesburg Water's statement is that the boreholes cannot lawfully be equipped, commissioned or used.
Johannesburg Water also corrected the money. The roughly R37 million reported publicly is planned water distribution infrastructure across all nine locations, not the cost of standpipes for one borehole at Waterworks. Comparing it against a single privately installed system is misleading.
Holes in the ground, drilled and paid for, that cannot supply a drop until an authorisation lands. That is the same failure as an uncertified installation in a house, at a scale where somebody had to put out a statement about it.
Arabella holds the trade certificates for the contractors in its network and checks the accreditation behind each one rather than the certificate itself. A client accepting a page nobody accredited is the failure we see most often. What the verification covers is on the client page, and the water and compliance items we track sit in insights.
On Monday
Find the most recent plumbing certificate in your building file and read three things off it: what work it describes, the date, and the name and number of the person who signed.
Then put that number into the PIRB register yourself rather than reading the letterhead. If the certificate is for a sale in Cape Town, the registration that counts is the City's, so ask the plumber for their City registration number as well. If the work described is narrower than the work you remember paying for, that difference is your uncovered exposure, and it is cheaper to find it now than during a sale.
