2026-10-14 EIR/3106/2026 Acknowledgement from Environmental Information Requests Dear Sion Buckler Request for information We refer to your request for information, dated 12th October 2026. We are dealing with your request as one made under the Environmental Information Regulations 2004 (“the Regulations”). In accordance with the Regulations, we will respond to your request within 20 working days of the date of receipt. Please note: Under Regulation 7 of the EIR, if a request is exceptionally complex or voluminous, this period may be extended to 40 working days. We will notify you if an extension is required. For completeness, we advise that the Information Commissioner’s Office states that the time period for responding should be calculated from the day after the request is received. In the meantime, if you have any queries, please contact us on email EnvironmentalInformationRequests@dwrcymru.com We have assigned reference EIR/3106/2026 to your request. Please kindly note this in all correspondence with us regarding this matter. Yours faithfully Ceryn Dŵr Cymru Welsh Water [Request summary: rDNA / plasmid DNA / engineered nucleic-acid constructs in water supply, catchment risk assessments under Reg 27/28, methodology. Dated 12 Oct 2026.]