Private Water Supply Notices: Regulation 18 and Action Records

1. What is a private water supply notice?

Local authorities regulate private water supplies in England under the Private Water Supplies (England) Regulations 2016, as amended, together with powers in the Water Industry Act 1991. A formal notice is not simply an advisory letter: it is a legal enforcement document served under a particular power and it should identify what the recipient is required to do.

For an operator or property owner, the practical first step is to identify exactly what document has been served. Do not assume that every council letter, failed test result or recommendation is a “Regulation 18 notice”. Keep the complete document, including schedules, plans, attachments and covering correspondence, because the legal basis and required actions matter.

2. When Regulation 18 applies

DWI’s current England guidance states that where a private water supply constitutes a potential danger to human health, the local authority must serve a notice under Regulation 18 on the relevant person or persons. The authority may reach that position from its risk assessment, monitoring results and investigation of the supply.

Before and during that process, Regulation 15 requires the local authority, where it considers a supply to be a potential danger to human health, to take prompt steps so people likely to consume the water are informed, told the nature of the potential danger where possible, and given advice to minimise the danger.

A Regulation 18 notice can be served on one or more “relevant persons” depending on who controls the source, premises or parts of the supply and who is able to carry out the necessary work. On shared supplies, this is one reason ownership, management and maintenance responsibilities need to be documented rather than assumed.

3. What a Regulation 18 notice can require

DWI’s Regulation 18 guidance says a notice should state the grounds for service and may prohibit or restrict use of the supply. It should also specify the actions needed to protect human health, restore an acceptable water supply and maintain that position after restoration.

Depending on the problem, a notice may therefore contain both immediate controls and longer-term remedial work. It may include different actions for different relevant persons, deadlines, information requirements and conditions. DWI also makes clear that short-term advice such as boiling water is not a permanent treatment solution; the notice should address the investigation and remedial work needed to resolve the underlying problem.

For record keeping, capture the wording accurately. If the notice lists six requirements, create six linked actions rather than replacing them with a single vague task such as “fix water issue”. The task system should help manage the work without rewriting or weakening the legal requirement.

4. Regulation 18 vs Section 80

Not every unwholesome private water supply is dealt with under Regulation 18. DWI distinguishes a supply that presents a potential danger to human health from one that is unwholesome but is not considered such a danger.

Where water is unwholesome but does not present a potential danger to human health, DWI says the local authority may use a notice under Section 80 of the Water Industry Act 1991 if appropriate remedial action has not been taken within 28 days after the authority establishes the cause. Section 80 can also be relevant to insufficiency. Its objection and confirmation process is different from the Regulation 18 appeal route.

That distinction matters operationally. Record the exact statutory provision printed on the notice rather than labelling every enforcement document “Regulation 18”. If you are unsure what has been served, ask the issuing authority.

5. What to do when a notice arrives

If a deadline is unclear, obtain clarification from the issuing authority rather than inventing a date. If several owners or businesses share the supply, circulate the notice only in a way that respects the authority’s instructions and any personal information while ensuring the people responsible for actions know what is required.

6. Build a clear action record

A useful action record creates a traceable line from the notice to the work and then to evidence. For each requirement, record: the notice clause or wording; responsible person; target date; interim control if any; contractor or competent person involved; evidence produced; follow-up sampling or inspection; correspondence with the authority; and the final status confirmed by the authority.

Keep recommendations separate from legal requirements. A contractor may suggest additional work that is sensible but not expressly required by the notice. Record it, but do not blur it into the statutory requirement. The same principle applies to internal due dates: they can be earlier than the legal deadline, but should not replace it.

Useful supporting evidence can include photographs, invoices, commissioning or service records, treatment settings, laboratory reports, flushing or disinfection records, drawings and emails from the authority. The right evidence depends on the action; collecting paperwork for its own sake is not the goal.

7. Interim controls and communication

If the authority requires restrictions, alternative water, boil-water advice or another temporary measure, record when it started, who was told, how the message was communicated and how the control was maintained. For commercial, public or shared supplies, a distribution list or communication log can be particularly valuable.

Do not close an interim-control task merely because permanent work has been completed. Keep it active until the authority’s instructions allow it to be withdrawn. This avoids the dangerous gap where remedial work is finished but the supply has not yet been formally cleared for normal use.

8. Appeals and deadlines

Regulation 19 provides an appeal route for a person aggrieved by a Regulation 18 notice. DWI’s current guidance states that the appeal is to the magistrates’ court and must be made within 28 days of the notice being served. The notice remains in force during the appeal unless the court suspends it.

This guide cannot advise whether an appeal is appropriate. If you are considering one, obtain suitable legal advice promptly because the time limit is short. Keep any appeal documents with the notice record and continue to follow requirements that remain in force.

Failure to comply with a Regulation 18 notice is an offence. DWI publishes separate current guidance on Regulation 20 penalties; because consequences can be serious, use the legislation and current DWI material rather than relying on a summary of penalty levels on a general guidance page.

9. Completion and revocation

Completing your internal task list is not the same as discharging a legal notice. DWI states that the local authority should monitor compliance and must revoke a Regulation 18 notice when it is satisfied that the risk to health has been sufficiently mitigated.

Keep the authority’s revocation or other written close-out confirmation with the original notice. If the notice is amended or re-issued during the investigation, retain the earlier version as part of the history and clearly identify which version is current.

10. How this differs from corrective-action guidance

This page is specifically about formal notices and the legal/administrative record around them. The corrective action log guide is broader: it covers how to investigate and manage problems whether or not a formal notice has been served. The failed test guide focuses on what happens after an adverse result, while the record-keeping guide covers the wider evidence estate for the whole supply.

Frequently asked questions