Private water supplies & EHO compliance

A Private Water Supply (PWS) is any water source not provided by a licensed water company — typically a borehole, well, spring or reservoir. Around 1% of UK properties rely on a PWS, mostly rural homes and commercial sites. Every PWS falls under the Private Water Supplies (England) Regulations 2016 and is regulated by your local authority's Environmental Health Officers (EHO) — the intensity of regulation depends on who uses the supply and for what.

Every PWS is covered by the regulations to some degree, including supplies serving just the owner's household. The regulatory weight increases with who else uses the water. Common categories where compliance is more involved include: landlords letting properties on a private supply; holiday cottages and Airbnb hosts; schools, nurseries and care homes; restaurants, pubs and farm shops; commercial premises with employees; B&Bs and hotels; agricultural businesses where staff or the public access the supply. Suppliers are responsible for ensuring the water is 'wholesome' — safe and meeting the drinking water standards in the Regulations.

Regulation 8 is the most heavily regulated category — large supplies serving more than 50 people per day on average, or supplying water as part of a commercial or public activity at scale. Mandatory risk assessments, regular sampling and formal reporting to the local authority. Regulation 9 covers smaller commercial / public supplies — 50 people or fewer per day, or used as part of a commercial activity at smaller scale (a farm shop, pub, B&B, small holiday let, food business). Still requires risk assessment and monitoring, but less intensive than Reg 8. Regulation 10 is the lightest-touch regime: a single private dwelling that is owner-occupied (not rented out). A rented dwelling counts as a commercial activity and falls under Reg 9 instead. We work across all three — we'll confirm which category your supply falls under as part of the initial assessment.

Your local authority's Environmental Health Officer will visit the site to inspect the supply infrastructure (borehole headworks, storage, treatment, distribution) and assess potential contamination risks (proximity to drainage, livestock, agricultural activity, fuel storage). They'll review your monitoring records and take water samples for laboratory analysis. The frequency of inspections depends on the supply category and risk profile — typically every 1-5 years.

Standard PWS testing covers chemical parameters (pH, conductivity, nitrate, nitrite, lead, copper, arsenic), microbiological parameters (E. coli, coliforms, enterococci) and physical properties (turbidity, colour, odour). The exact suite depends on supply category and EHO risk assessment. Samples are analysed at a UKAS-accredited laboratory and we provide the formal results report your local authority requires. Most domestic-scale failures are microbiological (E. coli or coliforms) and resolve with UV treatment.

A failed sample doesn't automatically mean enforcement — it triggers a remediation process. Typical steps: identify the cause (usually a catchment or source factor such as agricultural activity nearby, seasonal groundwater changes, or aquifer-level conditions), specify and implement the remediation (additional treatment stages, catchment management, or source protection works), resample to confirm the issue is resolved, and document the whole process for the EHO. We handle all of this end-to-end. Persistent failures or refusal to remediate can lead to formal enforcement notices.

For a Regulation 8 supply (large commercial or public — >50 people or commercial activity at scale), monitoring typically involves quarterly or biannual sampling depending on the category, plus a full risk-assessment review every five years. For Regulation 9 supplies (smaller commercial — fewer than 50 people or smaller commercial activity) the regime is similar but lighter — annual sampling is common. For Regulation 10 supplies (owner-occupied single dwellings) the regime is lightest, but the supply is still inspected and risk-assessed on a 5-year cycle. We offer scheduled monitoring contracts across all three regulatory categories — sampling, lab analysis, reporting to the local authority and treatment-system maintenance. Most clients prefer this as a single annual or quarterly visit rather than managing it piecemeal.

Yes. We routinely take on PWS clients at every stage: setting up a brand-new private supply (designed to meet the relevant regulations from day one), bringing an existing supply into compliance (especially after a property purchase or a change of use), or taking over compliance management from a previous arrangement. Our in-house team handles the whole package — drilling, sampling, treatment design and installation, EHO liaison and ongoing monitoring — so you get one point of contact across the entire service.