ISO 46001:2019 is the international standard that sets the requirements for a water efficiency management system, and it applies to any organisation of any size that uses water. It was published in July 2019, received a one-page climate action amendment in February 2024, and has been under revision since July 2025, with the new edition still at working draft stage.
This guide is for facility, sustainability and HSE managers, many of them in the Gulf, who need to know what the standard asks for and which records prove it.
What does ISO 46001:2019 require?
ISO 46001 asks you to run water efficiency as a managed system rather than a one-off saving campaign. Its scope is the water an organisation uses as an end user, not the work of a water utility.
ISO frames the approach as reduce, replace or reuse. Reduce covers efficient fittings, monitoring and leak detection. Replace means using reclaimed water, sea water or rainwater instead of drinking water where feasible. Reuse covers recycling process water or grey water.
The standard was developed by working group WG 12 of ISO/TC 224, the committee for drinking water, wastewater and stormwater services. ISO says it was inspired by work on Singapore's national standard, SS 577. It follows the same clause structure as ISO 14001 and ISO 50001, from context in clause 4 to improvement in clause 10. Annex A gives guidance on using the requirements, and Annex B gives worked water efficiency scenarios.
Most of the water-specific content sits in clauses 6 and 8. Clause 6.3 adds targets and action plans to the usual objectives. Clause 8 adds three sections of its own: design, the procurement of water services, products and equipment, and maintenance and inspection.
Is ISO 46001:2019 still current, and what did the 2024 amendment change?
Yes. The 2019 first edition is the published standard, read together with ISO 46001:2019/Amd 1:2024. ISO's ISO 46001 page lists both and shows the amendment at no charge.
The amendment was published on 23 February 2024 as part of ISO's climate action changes to its management system standards. The joint ISO and IAF communiqué explains the two additions. In clause 4.1 you must now decide whether climate change is a relevant issue for your system. A note in clause 4.2 adds that interested parties can have climate-related requirements.
For water, the link is direct. Hotter summers raise cooling and irrigation demand, and drought or supply limits change your risks.
ISO's systematic review closed in December 2024, and on 1 July 2025 the standard was marked for revision. A second edition is registered as ISO/WD 46001. Its working draft comment period closed on 3 March 2026, and ISO lists no publication date. Until a new edition is published, implement and audit against the 2019 text and its amendment.
How do you measure water efficiency under ISO 46001?
The standard measures efficiency as water used per unit of business activity, not as a raw total. A business activity indicator is the measure of your core operation. The definitions give examples such as cubic metres per kilogram of product, litres per person and cubic metres per guest room. Divide net water use by that indicator and you have your water efficiency indicator.
Net use means the water you used, minus water that is reclaimed or recycled for further use. That rewards reuse rather than hiding it.
Your starting point is the baseline water efficiency indicator, which can be set during the initial water use review. You also identify your significant water uses. These are the activities that use a large share of your water or offer real room to improve.
The water efficiency management plan then sets out the scope, measures, actions and priorities for improving your current water use. In practice, the quality of your metering decides how good these numbers are. One utility meter for a whole site rarely shows where the water goes, so sub-metering is often the first investment.
Which clauses need which records?
The table maps each clause to what a certification body usually asks to see. The middle and right columns are AGS's interpretation, not ISO's wording.
| Clause | What it asks you to do | Typical records |
|---|---|---|
| 4 Context | Set the scope, list issues and interested parties, decide whether climate change is relevant | Scope statement, context and interested parties register, legal and other requirements register |
| 5 Leadership | Top management commitment, a water efficiency policy, assigned roles | Signed policy, organisation chart, role descriptions |
| 6 Planning | Address risks and opportunities, set objectives, targets and action plans | Risk and opportunity register, water use review, baseline, objectives and action plan |
| 7 Support | Resources, competence, awareness, communication, document control | Training records, competence matrix, master list of documents |
| 8 Operation | Operational controls, design, procurement, maintenance and inspection | Operating criteria, purchasing specifications, maintenance and leak inspection logs |
| 9 Performance evaluation | Monitor and analyse water use, internal audit, management review | Meter readings, indicator trends, audit reports, review minutes |
| 10 Improvement | Correct nonconformities and improve continually | Corrective action reports, root cause analyses, improvement actions |
What changes for an organisation in the GCC?
Where your supply is desalinated, saving water also saves the energy used to produce and pump it.
National targets give your system a context to report against. The UAE Water Security Strategy 2036 aims to cut total water demand by 21% and to raise the reuse of treated water to 95%. In Dubai, DEWA reports that the Demand Side Management Strategy, launched in June 2013, aims to cut energy and water demand by 30% by 2030. One of its nine programmes covers water reuse and efficient irrigation.
In Saudi Arabia, the Ministry of Environment, Water and Agriculture's National Water Strategy assessment found that agriculture accounted for 84% of the Kingdom's water requirements, using 2015 data. It put irrigation efficiency at around 50%, against a best practice above 75%. For farms and agribusiness, irrigation is almost always the significant water use.
Four practical points follow for a Gulf site:
- Set the baseline over a full year. Cooling towers, irrigation and pools peak in summer, so a winter baseline makes later months look worse than they are.
- Treat the replace route seriously. Treated sewage effluent for irrigation, sea water for cooling and recovered air conditioning condensate can all replace drinking water where local rules allow.
- Put tariffs, municipality rules and any reuse permits in your legal register, and record who checks them for changes.
- For hotels, use a per-guest-room or per-occupied-room indicator. GSTC hotel certification also checks water performance, as our guide to the GSTC Hotel Standard explains.
Can an organisation be certified to ISO 46001?
Yes. ISO 46001 is a requirements standard, so a certification body can audit your system against it and issue a certificate. ISO itself does not certify anyone. Before you sign, ask whether its ISO 46001 certificates are issued under accreditation and ask to see its accreditation scope.
Many organisations add water to a system they already run. If you hold ISO 14001, the shared structure lets the water review sit alongside your environmental aspects. Our guide to ISO 14001:2026 covers the environmental side. The water and energy reviews also overlap, so pumping, hot water and cooling can be analysed once, as described in our ISO 50001 guide.
How AGS can help
The ISO 46001 2019 WEMS toolkit contains 75 editable Microsoft Word documents. It includes a WEMS manual, a water efficiency policy and a water efficiency management plan. There are 14 procedures, including the water use review and corrective action, and 36 forms, such as a water use review report and a daily water operation report. It also has 8 checklists, including an ISO 46001 clause-wise internal audit checklist, 5 guidance notes and 3 training modules.
Frequently asked questions
Who publishes ISO 46001?
The International Organization for Standardization publishes it. It was prepared by ISO/TC 224, whose secretariat is held by AFNOR, the French national standards body.
Does ISO 46001 apply to water utilities?
It is written for organisations that use water as end users. Utilities can apply it to their own water use, but it does not cover running a supply network.
Does the 2024 amendment mean a new edition?
No. The amendment adds two climate change points to clauses 4.1 and 4.2 of the 2019 edition. The new edition is a separate revision that started in 2025.
Does buying documentation mean the organisation will be certified?
No. Documents are a starting point. Certification depends on how the system is run and on the certification body's audit findings.
AGS provides independent documentation toolkits. This guide and the referenced documents are prepared to support ISO 46001 requirements. They are not affiliated with, endorsed by or approved by ISO, DEWA, the Ministry of Environment, Water and Agriculture, any government body or any certification body, and they do not guarantee any certification outcome.
Reviewed October 2026. Facts checked against the sources current at publication.
