Water Testing near you

The Drinking Water Inspectorate's instruction to consumers is to contact the water company in the first instance if you have concerns about your drinking water supply. There is a practical reason as well as a procedural one: companies test water daily in your area, they will provide a summary of water quality in your area free of charge on request, and many publish it on their websites. That free information often answers the question before anyone takes a sample of anything.

Where the concern needs a sample, the Inspectorate says companies will normally take one in response to a complaint from a consumer, depending on the nature of it. That is the sample worth having: taken by the party with a statutory duty, analysed to the regime the regulations set, and interpreted against the company's own history for your area. A privately commissioned analysis of a single glass has none of that context.

If you have already contacted the company and are not satisfied with the response, the Inspectorate is the escalation. It asks you to contact it on 0330 041 6501 or at dwi.enquiries@defra.gov.uk, or through its online form, and says one of its inspectors will investigate the matter with the water company on your behalf and inform you of the outcome. Its inspectors request a full report on the complaint from the company and decide whether further action is needed, and it warns that this takes a minimum of 10 working days and may be longer for more complicated issues.

The Private Water Supplies (England) Regulations 2016 split private supplies into categories and attach different monitoring to each. For supplies falling under regulation 10 — the smaller domestic ones that are not large supplies and are not used as part of a commercial or public activity — the local authority must monitor for conductivity, enterococci, Escherichia coli, hydrogen ion and turbidity, together with any Schedule 1 parameter the risk assessment has identified as non-compliant and anything else the risk assessment identifies as a potential danger to human health. The frequency is set out plainly: the authority must carry out that monitoring at least every five years, and more frequently if the risk assessment shows this to be necessary.

Larger supplies and those used as part of a commercial or public activity are dealt with under regulation 9 and carry a heavier regime. Schedule 2 to the Regulations sets out check monitoring and audit monitoring, with sampling frequencies stepped by the volume of water supplied per day. Check monitoring covers the routine indicators, including E. coli and coliform bacteria in all supplies, and colour, odour, taste and turbidity in all supplies. Audit monitoring covers the further Schedule 1 parameters not already sampled during check monitoring, to establish whether the supply satisfies each concentration or value. Where water quality is consistently stable and below the relevant values, authorities may reduce frequencies.

Two things follow for a household. First, once every five years is the statutory floor for a small domestic supply and not a description of thorough surveillance. Second, the risk assessment is what widens the parameter list beyond the basic five, which is why a supply that has never been risk assessed is a supply nobody has decided what to test for.

A sample is a moment and a place. Where the sample was taken from, how long the tap had been running, which tap it was, what container it went into and how quickly it reached the laboratory all change the number that comes back. That is why regulatory sampling specifies procedure and why a bottle filled by a householder and posted the next day is not the same exercise, however accredited the laboratory at the other end.

The second limitation is scope. A test only reports what it was asked to look for, so a clear result on five parameters says nothing whatever about the sixth. That is precisely the gap the risk assessment exists to close: it identifies the routes by which contamination could reach a particular source, and the parameter list is then built from those routes rather than from a standard package.

The third is what a failure actually triggers. On a private supply the local authority does not simply file the result. Under the 2016 Regulations it must investigate where it suspects a supply is unwholesome or fails a prescribed concentration or value, and where contamination arises from the distribution system within domestic premises it must promptly inform the people likely to be affected and offer them advice. Where the problem lies elsewhere, notice follows — under regulation 18 where there is a danger to health, or within 28 days under section 80 of the Water Industry Act 1991 in other cases, unless appropriate remedial action has been taken. A test is the start of a process, not the end of one.

In England and Wales, the regulator for a public supply is the Drinking Water Inspectorate, but consumers go to the water company first and to the Inspectorate only if the company's response is unsatisfactory. For a private supply the regulator is the local authority, and the Inspectorate is explicit that it acts as technical adviser to authorities rather than working directly with consumers or supply owners. Wales has its own private water supplies regulations made separately from the English 2016 instrument, so the detail should be checked against the Welsh version.

Scotland has its own private water supplies regime and its own guidance, administered through local councils, and the Drinking Water Quality Regulator for Scotland occupies the equivalent regulatory position for public supplies. Northern Ireland is separate again, with NI Water as the sole water and sewerage undertaker and its own regulatory arrangements for private supplies.

What is common everywhere is the order: the body with the duty first, the independent laboratory second. The party that has to investigate also has the historical data, the sampling procedure and, in the case of a water company responding to a complaint, the obligation to bear the cost. Commissioning your own analysis before that conversation is the sequence that most often produces a number nobody can interpret.

Private analysis is priced per parameter and per visit, so the list is what drives the figure. What moves it is how many parameters are being tested and whether microbiological work is included, whether somebody travels to take the sample properly or you are sent a kit, how quickly the bottle must reach the laboratory and whether that means a courier, whether the laboratory holds accreditation for every determinand on the list, whether a risk assessment or a site inspection is included alongside the analysis, and whether you need an interpreted report rather than a sheet of numbers. Local authority sampling and risk assessment on a private supply are separately chargeable and cost-recoverable by the authority, so ask the council what it charges before commissioning anything privately.

LokalMatch is only the introduction. Set out what you want tested and why once, say whether the supply is public or private, add your postcode, and testing and water quality specialists covering your area get in touch with you. Homeowners are not charged for this; the pros pay for the requests they receive. LokalMatch does not take samples, run laboratories or interpret results, has no say in pricing, and does not vet, rank or recommend anyone who replies, so checking what accreditation a laboratory holds and what the report will actually tell you is a question to put to each of them.