Climate Delegated Act Water supply, sewerage, waste management and remediation NACE E36.00NACE F42.9

Desalination

Construction, operation, upgrade, extension and renewal of desalination plants to produce water to be distributed in drinking water supply systems.

The economic activity includes abstraction of marine or brackish water, pre-treatment (such as treatment designed to remove contaminants, scale formation or membrane fouling), treatment (such as reverse osmosis using membrane technology), post-treatment (disinfection and conditioning) and storage of processed water. The economic activity also includes the disposal of brine (reject water) accomplished by means of deep-sea pipes or outflows providing dilution, or through other brine discharge techniques for plants located on more inland sites (such as for brackish water desalination).

The economic activity may be applied to waters with varying levels of salinity, as long as those waters do not qualify as freshwater, as defined in Annex II to Directive 2000/60/EC.

The economic activities in this category could be associated with several NACE codes, in particular E36.00 and F42.9, in accordance with the statistical classification of economic activities established by Regulation (EC) No 1893/2006.

Substantial contribution

This activity can make a substantial contribution to the following objective(s). The activity must also pass DNSH assessment against the remaining five objectives.

✓ Climate adaptation

1. The economic activity has implemented physical and non-physical solutions (‘adaptation solutions’) that substantially reduce the most important physical climate risks that are material to that activity.2. The physical climate risks that are material to the activity have been identified from those listed in Appendix A of the applicable Delegated Act by performing a robust climate risk and vulnerability assessment with the following steps:screening of the activity to identify which physical climate risks from the list in Appendix A of the applicable Delegated Act may affect the performance of the economic activity during its expected lifetime;where the activity is assessed to be at risk from one or more of the physical climate risks listed in Appendix A of the applicable Delegated Act, a climate risk and vulnerability assessment to assess the materiality of the physical climate risks on the economic activity;an assessment of adaptation solutions that can reduce the identified physical climate risk.The climate risk and vulnerability assessment is proportionate to the scale of the activity and its expected lifespan, such that: for activities with an expected lifespan of less than 10 years, the assessment is performed, at least by using climate projections at the smallest appropriate scale;for all other activities, the assessment is performed using the highest available resolution, state-of-the-art climate projections across the existing range of future scenarios(478) consistent with the expected lifetime of the activity, including, at least, 10 to 30 year climate projections scenarios for major investments. 3. The climate projections and assessment of impacts are based on best practice and available guidance and take into account the state-of-the-art science for vulnerability and risk analysis and related methodologies in line with the most recent Intergovernmental Panel on Climate Change reports(479), scientific peer-reviewed publications and open source(480) or paying models.4. The adaptation solutions implemented:do not adversely affect the adaptation efforts or the level of resilience to physical climate risks of other people, of nature, of cultural heritage, of assets and of other economic activities;favour nature-based solutions(481) or rely on blue or green infrastructure(482) to the extent possible;are consistent with local, sectoral, regional or national adaptation plans and strategies;are monitored and measured against pre-defined indicators and remedial action is considered where those indicators are not met; where the solution implemented is physical and consists in an activity for which technical screening criteria have been specified in this Annex, the solution complies with the do no significant harm technical screening criteria for that activity.5. In order for an activity to be considered as an enabling activity as referred to in Article 11(1), point (b), of Regulation (EU) 2020/852, the economic operator demonstrates, through an assessment of current and future climate risks, including uncertainty and based on robust data, that the activity provides a technology, product, service, information, or practice, or promotes their uses with one of the following primary objectives: increasing the level of resilience to physical climate risks of other people, of nature, of cultural heritage, of assets and of other economic activities;contributing to adaptation efforts of other people, of nature, of cultural heritage, of assets and of other economic activities.

Do No Significant Harm criteria

To be taxonomy-aligned, this activity must not significantly harm any of the five objectives it does not substantially contribute to.

Climate change mitigation

The greenhouse gas emissions from the desalination plant do not exceed 1080 gCO2e/m3 of freshwater produced (includingtreatments, pumping and brine disposal and the related energy use).

Key thresholds

MetricThresholdUnit
Greenhouse gas emissions1080gCO2e/m3

Water and marine resources

Environmental degradation risks related to preserving water quality and avoiding water stress are identified and addressed with the aim of achieving good water status and good ecological potential as defined in Article 2, points (22) and (23), of Regulation (EU) 2020/852, in accordance with Directive 2000/60/EC(483) and with a water use and protection management plan, developed thereunder for the potentially affected water body or bodies, in consultation with relevant stakeholders.The project has been authorised by the competent authority, in the framework of integrated water management, having as priority taken into account all other viable water supply options, water demand management and efficiency measures, in consultation with the water management authorities.An Environmental Impact Assessment or screening is carried out in accordance with national legislation, and includes an assessment of the impact on freshwater and marine waters in accordance with Directives 2000/60/EC and 2008/56/EC. The activity does not hamper the achievement of good environmental status of marine waters or does not deteriorate marine waters that are already in good environmental status as defined in Article 2, points (21) of Regulation (EU) 2020/852 and in accordance with Directive 2008/56/EC, that requires in particular that the appropriate measures are taken to prevent or mitigate impacts in relation to the descriptors laid down in Annex I to that Directive, taking into account the Commission Decision (EU) 2017/848 in relation to the relevant criteria and methodological standards for those descriptors.The activity complies with Directive 2014/89/EU of the European Parliament and of the Council(484).In order to limit thermal anomalies associated with the discharge of waste heat, the operator of desalination plants controls: the maximum temperature of the recipient marine water body after mixing;the maximum temperature difference between the discharged brine water and the recipient marine water body. The temperature control is implemented in accordance with the threshold values set out in Union law and national law.

Documentation typically required

  • Water use and protection management plan — Developed for potentially affected water bodies under Directive 2000/60/EC, in consultation with relevant stakeholders.
  • Environmental Impact Assessment or screening report — Carried out in accordance with national legislation, including assessment of impact on freshwater and marine waters per Directives 2000/60/EC and 2008/56/EC.
  • Project authorization from competent authority — Granted in the framework of integrated water management, considering viable alternatives and efficiency measures.

Circular economy

N/A

Pollution prevention and control

The brine disposal is based on an environmental impact study including a site-specific assessment of impacts relative to brine marine disposal taking into account the following elements: description and understanding of the local baseline conditions, such as seawater quality, topography, hydrodynamic characteristics, and marine ecosystems based on field measurements and surveys;analysis of brine discharge impacts, based on dispersion modelling of the brine discharge and laboratory toxicity testing, aimed at defining safe discharge conditions taking into account salt concentration, total alkalinity, temperature and toxic metals.The level of detail required in the assessment is appropriate to the size, process and recovery rates of the desalination plant, as well as its location.The environmental impact study demonstrates that the impact of brine discharge does not deteriorate the ecosystem’s integrity.Based on the environmental impact study, the activity adopts safe brine discharge criteria, including site-specific minimum brine dilution objectives, based on an appropriate characterisation of local water conditions, ecosystems, species and habitats, in order to mitigate the possible adverse effects of brine disposal.

Documentation typically required

  • Environmental impact study — Includes site-specific assessment: description of local baseline (seawater quality, topography, hydrodynamics, marine ecosystems based on field measurements), analysis of brine discharge impacts using dispersion modeling and laboratory toxicity testing, and demonstration that discharge does not deteriorate ecosystem integrity. The study defines safe brine discharge criteria with site-specific minimum brine dilution objectives.

Biodiversity and ecosystems

An Environmental Impact Assessment (EIA) or screening(485) has been completed in accordance with relevant EIA national legislation(486). Where an EIA has been carried out, the required mitigation, restoration or compensation measures for protecting the environment are implemented.The activity does not have significant effects on protected areas (UNESCO World Heritage sites, Key Biodiversity Areas, as well as other protected areas than Natura 2000 sites), and protected species based on an assessment of its impact that takes into account the best available knowledge(487).

Documentation typically required

  • Environmental Impact Assessment (EIA) or screening — Completed in accordance with relevant national EIA legislation.
  • Evidence of implementation of mitigation, restoration or compensation measures — Required when an EIA has been carried out.
  • Assessment of impact on protected areas and species — Must demonstrate no significant effects on UNESCO World Heritage sites, Key Biodiversity Areas, other protected areas (excluding Natura 2000), and protected species, based on best available knowledge.

Criteria sourced from the EU Taxonomy Navigator. Applicable act: Climate Delegated Act (OJ L 442, 9.12.2021). Last verified: 19 July 2026.

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