- There is no specific England-wide legal requirement to keep a document called an “emergency plan”, but DWI expects relevant persons to plan for contamination and insufficiency.
- Keep quality emergencies separate from insufficiency: unsafe water and too little water engage different legal routes.
- Do not issue generic boil-water, do-not-drink or do-not-use advice without the site-specific authority/public-health assessment.
- Pre-arrange contacts, isolation points, communication routes and alternative-water options before an incident.
- Record the event, immediate controls, advice received, repairs, investigation, follow-up evidence and the decision to return to normal use.
- Feed the incident back into corrective actions, maintenance, treatment review, change management and the statutory risk-assessment process.
Why have an emergency plan?
Private supplies can fail in several different ways: contamination can make water unsafe, a treatment stage can stop working, a pump or power supply can fail, a pipe or storage tank can leak, flooding can affect the source, or drought can reduce yield until there is simply not enough water. The first few minutes of each event are easier to manage if responsibilities and contacts were agreed before the alarm or complaint arrived.
DWI's guidance for relevant persons says those responsible for a private supply should have plans for insufficiency, drought or contamination. Its insufficiency guidance goes further and recommends clear, achievable documented contingency procedures, particularly for large and Regulation 9 commercial/public supplies. That is strong operational guidance, but it should not be misdescribed as a statutory requirement to maintain a document with a particular title or format.
The useful objective is not paperwork for its own sake. A plan should shorten the time between recognising a problem and protecting the people who use the supply. It should also create a reliable evidence trail showing what happened, who was contacted, what instructions were received and how normal operation was restored.
England legal and regulatory context
For England, the main water-quality framework is the Private Water Supplies (England) Regulations 2016 as amended. The DWI legislation index identifies those Regulations as SI 2016/618 and also identifies the 2018 amendment. The operative emergency duties are mainly functions of the local authority, not powers that the owner should try to exercise for itself.
| Provision | What it means during an incident |
|---|---|
| Regulation 15 | If the local authority considers the supply a potential danger to human health, it must promptly ensure likely consumers are informed, told the nature of the danger where possible and given advice to minimise it. DWI links this to service of a Regulation 18 notice. |
| Regulation 16 | The local authority must investigate failures and determine the cause. DWI's current investigation guidance warns that simply resampling to obtain another result is not, by itself, an investigation. |
| Regulation 18 | Where a supply constitutes a potential danger to human health, the local authority must serve a notice on the relevant person or persons, subject to the statutory test. The notice may require restriction/prohibition and corrective action. |
| Water Industry Act 1991, section 80 | Insufficiency has a separate route. A local authority has powers where a private supply is failing, has failed or is likely to fail to provide a wholesome supply sufficient for domestic purposes. |
| Regulation 13 | A new supply, a reinstated supply after 12 months of non-use, or a previously abandoned/disused source brought back for domestic purposes must be risk assessed and monitoring requirements determined before (re)use. |
Types of emergency to plan for
A useful plan does not treat every alarm as the same event. Create a short response card for each realistic failure mode on your supply.
| Event | Immediate concern | Plan before it happens |
|---|---|---|
| Microbiological failure or suspected faecal contamination | Potential acute health risk; source, treatment, tank or distribution contamination may be involved. | Authority/laboratory contacts, isolation capability, communication list and contractor capable of inspection/disinfection. |
| Chemical contamination | The safe restriction may differ from microbiological events; boiling can be inappropriate for some contaminants. | Fast access to the authority and competent laboratory; do not pre-write a universal consumer instruction. |
| UV, dosing or filtration failure | Loss of a critical control can expose consumers even before a compliance result arrives. | Alarm response, bypass/isolation knowledge, competent treatment contractor, critical spare/consumable details. |
| Pump or power failure | Loss of supply, pressure or treatment; restart can introduce additional risks. | Electrician/pump contact, safe isolation, backup-power policy if applicable, storage/reserve knowledge. |
| Burst, leak or loss of pressure | Insufficiency plus possible ingress/contamination if system integrity is lost. | Valve map, repair contractor, users affected, temporary supply contacts and post-repair hygiene procedure from a competent person. |
| Flooding or heavy-rain ingress | Source, chamber, borehole headworks, tanks and drainage may be contaminated. | Flood inspection points and an alternative-supply route. DWI advises avoiding use where a private supply may have been affected until its status is confirmed. |
| Drought/source failure | Insufficiency rather than necessarily a water-quality failure. | Trigger levels, alternative water provider, demand-reduction options and written responsibilities for shared supplies. |
| Deliberate interference/vandalism | Unknown contamination or interruption. | Physical security, isolation, police/authority escalation where appropriate, evidence preservation and alternative water arrangements. |
Immediate response priorities
The plan should describe priorities rather than pretend to prescribe one universal technical response. A sensible sequence is:
- Protect people first. Stop or restrict the affected operation if that is necessary to prevent exposure and seek the local authority's advice promptly where safety may be affected.
- Identify the affected supply and extent. Record which source, treatment train, tank, distribution branch and premises may be involved. Do not assume a single sample point represents the whole event.
- Preserve facts. Record alarms, meter readings, rainfall/flooding, power interruptions, operator observations and any recent maintenance or changes before settings are altered.
- Escalate to the right people. Use the contact list rather than searching for numbers during the incident: local authority, laboratory, treatment contractor, pump/electrical contractor, site management and alternative-water provider as relevant.
- Follow competent instructions. The correct isolation, cleaning, disinfection, flushing, sampling and consumer restriction depends on the incident and system.
- Open a corrective action. Track temporary controls separately from the permanent fix so an emergency cannot be marked “closed” merely because the immediate alarm stopped.
If the problem is a failed sample, use the corrective-action guide for the investigation/close-out trail. If the problem is declining yield or interruption, use the emergency water requirement calculator to estimate a planning quantity, but confirm the actual contingency arrangements for your premises and users.
Consumer information and public-health advice
Do not hard-code a single “boil the water” instruction into every emergency plan. DWI's Regulation 18 guidance differentiates between types of hazard. Boil-water advice can be an appropriate interim measure for some microbiological events when the local authority considers the failure a potential danger to human health; significant chemical failures may instead require advice not to use the water for drinking, food preparation or other uses, with an alternative supply.
Regulation 15 places the statutory consumer-information duty on the local authority when it considers a supply a potential danger to health. In practice, the person controlling the supply may be asked to deliver messages to users and DWI says those exercising control should ensure users are made aware of quality or insufficiency issues and must comply with any notice served.
Make the plan capable of reaching people who are not regular users of the supply: holiday guests, contractors, visitors, temporary staff or customers may not know where notices are displayed. For commercial/public sites, nominate more than one person who can issue an authorised message if the primary contact is unavailable.
Alternative water and insufficiency
Insufficiency is not just another parameter failure. DWI's insufficiency guidance describes a supply as insufficient where it fails to provide enough water for human-consumption purposes, including domestic uses such as drinking, washing, cooking and sanitary purposes. The private-water-supply Regulations provide health-risk enforcement for water quality, while section 80 of the Water Industry Act 1991 provides local-authority powers in relation to an insufficient private supply.
DWI advises relevant persons to have documented contingency arrangements and says those procedures should include alternative supplies. Possible arrangements can include bottled water, tankers or bowsers, a water-company arrangement where available, a recognised commercial provider, or another properly controlled source. Availability is not guaranteed: DWI specifically warns that water companies may not be able to provide bottles or bowsers when they are dealing with their own emergency.
Do not assume a tanker, bowser or temporary tank is safe merely because it contains clear water. DWI's guidance points to BS 8551 best practice for temporary water supplies. Your plan should therefore record a reputable provider, hygiene/cleaning assurances, potable-water status, filling arrangements, protected connections, delivery/access requirements and who will check that temporary distribution cannot contaminate the normal system.
- Provider name, 24-hour or out-of-hours number and any account/reference details.
- What the provider can actually supply: bottles, tanker, bowser, temporary storage or connection.
- Expected lead time, delivery access, vehicle restrictions and minimum order.
- Where potable water will be stored/distributed securely on site.
- How users will be told which outlets or containers are safe to use.
- Who pays and who is authorised to place an emergency order on a shared supply.
What the emergency plan should contain
Keep the document short enough to use under pressure, but specific enough that a person who did not design the supply can act. The site's member workspace already provides a supply-specific Emergency & resilience plan section for the core contacts and procedures.
| Plan field | What to record |
|---|---|
| Supply identification | Supply name, premises served, source type, main treatment train and which users depend on it. |
| Key contacts | Local authority/private-water-supply team, laboratory, treatment contractor, electrician/pump contractor, plumber, site manager and alternative-water supplier. |
| Isolation points | Where to stop the source, treatment, pump, storage outlet or affected branch; link to the source-to-tap schematic rather than relying on memory. |
| Event triggers | Critical alarms, loss of pressure, visible source damage, flooding, failed sample notification, source-yield trigger or other site-specific escalation criteria. |
| People to notify | Named groups/locations and the communication channels available, including transient users. |
| Alternative supply | Provider, method, ordering authority, practical delivery route and any special premises needs. |
| Incident log | Time detected, observations, instructions, decisions, work completed, samples and evidence. |
| Recovery criteria | Who has authority to confirm return to normal operation and what evidence/advice is required before doing so. |
Keep your supply-specific emergency plan with the rest of your records
The workspace stores separate emergency contacts and procedures for each supply. It does not contact responders or certify the plan.
Open Emergency & resilience planIncident log and corrective-action evidence
The emergency plan is preparation; the incident record is the evidence of what actually happened. Start a timeline as soon as the event is recognised. Capture the initial condition before repairs or resets erase useful clues. Include who identified the event, which users/outlets were affected, calls made, authority or laboratory advice, interim restrictions, alternative water, contractor attendance, photos, work completed and all sampling results.
Keep temporary controls separate from permanent corrective work. For example, supplying bottled water can protect consumers while a UV fault is investigated, but it does not repair the disinfection system. Link the event to the corrective action log, and use the change-management guide if equipment, source, storage or distribution is altered during the permanent fix.
Recurring incidents are especially valuable evidence. Several short power-related UV failures, repeated low-pressure complaints or recurring contamination after heavy rain can show a risk that one isolated event might conceal. That evidence should be available to the local authority for its Regulation 6 risk assessment/review and to the competent professionals reviewing treatment or infrastructure.
Recovery, recommissioning and Regulation 13
“The water is running again” is not automatically the same as “the emergency is closed.” Recovery may require repair, cleaning/disinfection, recommissioning, investigation, sampling and explicit advice on when restrictions can be lifted. Your plan should name the person responsible for collecting the evidence and the authority/competent person whose advice is needed for return to normal use.
If the incident leads to prolonged shutdown, remember the specific England rule for genuinely reinstated supplies. DWI's Regulation 13 guidance says a supply reinstated after 12 months of non-use, or a previously abandoned/disused source brought back into domestic use, should not be put back into use until the local authority has completed the required risk assessment and determined monitoring requirements. A short outage does not automatically become a Regulation 13 reinstatement.
After every significant event, review the treatment and maintenance records, the risk-assessment guidance, and the emergency plan itself. Update contacts, valve locations or supplier details while the lessons are fresh.
People who may need extra communication support
Do not use an emergency plan to make medical judgements about individual consumers. Instead, identify operational communication needs that could make a warning or alternative-supply arrangement harder to deliver: people who cannot easily collect bottled water, premises with care responsibilities, users who need messages in another format/language, or businesses where many temporary visitors may be present.
DWI's guidance recognises that supply arrangements must take account of the people who use the water. During an actual health-risk event, ask the local authority or appropriate health professionals for site-specific advice where particular groups require additional protection. Record only the minimum contact/logistical information needed for the response and handle personal information appropriately.
Test and review the plan
A plan that has never been tried can fail for simple reasons: a number changed, the isolation valve is inaccessible, the tanker cannot reach the plant room, the person authorised to order bottled water is away, or the site has grown since the plan was written. Run a short desktop exercise at least periodically and after material changes.
- Call or verify critical supplier numbers rather than assuming they are current.
- Walk the isolation points and confirm they match the schematic.
- Check who can access plant rooms, keys and alarm systems out of hours.
- Review alternative-water demand when occupancy or commercial use changes.
- Check that emergency contacts are not stored only in one online account or one person's phone.
- After an incident or exercise, record what failed in the plan and assign an action to correct it.
Use the treatment maintenance planner for routine preventive work and the emergency plan for exceptional response. Keeping those purposes separate prevents the emergency guide from becoming an unreadable maintenance manual.
England versus Wales, Scotland and Northern Ireland
This guide's regulation numbers—13, 15, 16 and 18—refer to England. Wales has its own Private Water Supplies Regulations and different numbering for some equivalent provisions. Scotland and Northern Ireland operate under separate private-water-supply legislation and regulatory arrangements. Do not transfer England's numbering into documents for another UK nation.
If the supply is outside England, use the relevant national regulator/local authority guidance and adapt the emergency plan to that regime. The operational principles—clear contacts, safe alternative supply, communication, incident evidence and recovery criteria—remain useful, but the legal duties and notice procedures must come from the correct jurisdiction.
Frequently asked questions
Is a private water supply emergency plan legally required in England?
There is no specific requirement in the Private Water Supplies (England) Regulations for an operator document with that exact title. DWI nevertheless advises relevant persons to have contingency plans for contamination and insufficiency, and says local authorities should address missing contingency arrangements through risk assessment, particularly for larger and commercial/public supplies.
Should every contamination event trigger boil-water advice?
No. The suitable restriction depends on the hazard. DWI's Regulation 18 guidance describes boil-water advice for some microbiological risks, while significant chemical contamination can require different restrictions. Follow the current local-authority/public-health advice for the event.
Who tells consumers when a supply is a potential danger to health?
In England, Regulation 15 places duties on the local authority when it considers a private supply a potential danger to human health. The person controlling the supply may be required or asked to help communicate the advice and must comply with any notice served.
What is the difference between contamination and insufficiency?
Contamination concerns water quality and potential health risk. Insufficiency means there is not enough water for the relevant domestic/human-consumption purposes. DWI explains that insufficiency engages Water Industry Act powers as well as contingency planning rather than simply being treated as a failed water-quality parameter.
Can I rely on the council or water company to deliver bottled water?
No. DWI warns that neither is generally obliged to provide an alternative supply simply because a private supply fails, except in specific statutory circumstances, and water companies may be unable to provide bottles or bowsers during their own emergencies. Pre-arrange realistic alternatives.
When does Regulation 13 apply after a shutdown?
For England, DWI identifies a reinstated existing supply after 12 months of non-use, a new private supply, or a previously abandoned/disused source returned to domestic use. A short temporary outage is not automatically a Regulation 13 reinstatement.
What should I record before closing an emergency?
Keep the event timeline, users/outlets affected, authority/professional advice, communications, temporary controls, alternative water, investigation, repairs, cleaning/recommissioning evidence, follow-up sampling where required and the basis for returning the supply to normal use.
- DWI — Regulation 15: provision of information (England)
- DWI — Regulation 16: investigation (England)
- DWI — Regulation 18: notices and health-risk action (England)
- DWI — Managing insufficiency of private water supplies
- DWI — Regulation 13: new and reinstated supplies (England)
- DWI — Relevant persons: responsibilities and communication
- Legislation.gov.uk — Private Water Supplies (England) Regulations 2016 (SI 2016/618)
Checked 13 August 2026. This guide explains operational preparation and current England regulatory guidance; it is not a substitute for a local-authority decision, formal notice, laboratory interpretation or competent professional advice.
Prepare the record before you need it
Keep the emergency contacts and contingency actions for each supply with your treatment, monitoring, corrective-action and evidence records.
Open your emergency plan