Public Consultation: Wastewater Treatment Products
NSAI has launched a public consultation for the draft of S.R. 66:2015 +A1:202X Standard Recommendation providing guidance to wastewater treatment products in conformance with the EN 12566 series of standards.
Public consultation period: 10th December 2025 until 28th January 2026 inclusive.
The scope of the draft
This Standard Recommendation (S.R.) provides guidance on the:
- selection of wastewater treatment plants to treat domestic wastewater for applications for populations up to 50 PE in areas without a public sewer.
- minimum performance criteria for wastewater treatment plants that have been tested to I.S. EN 12566 (Parts 1, 3, 4, 6 and 7)
- scaling parameters and the sludge storage capacity necessary to achieve the minimum performance recommended for wastewater treatment plants that have been scaled up from the tested plant.
Content of the draft:
The draft contains the following sections:
1 Scope
2 Normative references
3 Terms and definitions
4 Performance levels for wastewater treatment plant for up 50 PE 78
5 Treatment effectiveness of wastewater treatment plants
6 Scaling up for small WWTS
7 Shared other party results
Annex A (informative) Required values for plants and units claiming compliance with S.R. 66+A1:2015
Annex B (informative) Scaling of primary chamber
Annex C (Informative) Typical template that can be used to assess the comparability of plants in accordance with clause 7
View the draft and submit comments:
All interested parties are invited to comment on the draft S.R. 66 draft the NSAI ‘Your Standards, Your Say’ forum: https://www.nsainep.ie/Home/Details/35546
NSAI would like to acknowledge the work of NSAI/TC 11 WG 6 for their contribution to the development of this draft standard.
Find out how to use Your Standards, Your Say here - https://www.nsai.ie/standards/your-standards-your-say/
[Disclaimer: All reasonable effort was made to ensure that the information on this page was correct at the time of publication. Any views or opinions expressed on this page are not necessarily those of NSAI. NSAI accepts no responsibility or liability howsoever arising from the contents of this publication or any errors, inaccuracies, or omissions in the contents of the information provided therein.]
