prEN 18247-1
(Main)Performance testing of on-site non-potable water systems - Part 1: Greywater systems
Performance testing of on-site non-potable water systems - Part 1: Greywater systems
This document specifies the testing conditions to assess the treatment performances of greywater systems.
Excluded from the scope of this document are:
- the testing of rainwater harvesting systems;
- the testing of systems for direct use as mentioned in EN 16941–2 "On-site non-potable water systems - Part 2: Systems for the use of treated greywater";
- the testing of blackwater treatment systems;
- the testing of wastewater treatment plant.
Überprüfung der Leistungsfähigkeit von On-Site Nichttrinkwasseranlagen - Teil 1: Grauwassersysteme
Dieses Dokument legt die Prüfbedingungen zur Beurteilung der Behandlungsleistungen von Grauwasseranlagen fest.
Folgendes ist aus dem Anwendungsbereich dieses Dokuments ausgeschlossen:
die Überprüfung von Regenwassernutzungsanlagen;
die Überprüfung von Anlagen für die direkte Verwendung nach EN 16941 2, „Vor-Ort-Anlagen für Nicht-Trinkwasser — Teil 2: Anlagen für die Verwendung von behandeltem Grauwasser“;
die Überprüfung von Schwarzwasserbehandlungsanlagen;
die Überprüfung von Kläranlagen.
Essais de performance des systèmes d'eau non potable autonomes - Partie 1 : Systèmes d'eaux grises
Preskušanje zmogljivosti na kraju samem nameščenih sistemov za nepitno vodo - 1. del: Sistemi za sivo vodo
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Preskušanje zmogljivosti na kraju samem nameščenih sistemov za nepitno vodo -
1. del: Sistemi za sivo vodo
Performance testing of on-site non-potable water systems - Part 1: Greywater systems
Überprüfung der Leistungsfähigkeit von On-Site Nichttrinkwasseranlagen - Teil 1:
Grauwassersysteme
Essais de performance des systèmes d'eau non potable autonomes - Partie 1 :
Systèmes d'eaux grises
Ta slovenski standard je istoveten z: prEN 18247-1
ICS:
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 93.025
English Version
Performance testing of on-site non-potable water systems
- Part 1: Greywater systems
Essais de performance des systèmes d'eau non potable Überprüfung der Leistungsfähigkeit von On-Site
autonomes - Partie 1 : Systèmes d'eaux grises Nichttrinkwasseranlagen - Teil 1: Grauwassersysteme
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 165.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18247-1:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Specification of greywater treatment systems . 7
5 Performance testing and evaluation . 8
5.1 General. 8
5.2 Dosing volumes . 8
5.3 Preparation of testing and evaluation . 8
5.4 Characteristics of test water . 9
5.4.1 Greywater test water – Mains water supply . 9
5.4.2 Greywater test water – Systems treating light grey water . 9
5.4.3 Greywater test water – Systems treating laundry water . 11
5.4.4 Greywater test water – Systems treating light grey water and laundry water combined
................................................................................................................................................................... 11
5.5 Hydraulic loading and schedules . 12
5.5.1 General. 12
5.5.2 Nominal loading . 15
5.5.3 Systems treating light greywater . 15
5.5.4 Systems treating greywater including laundry water (combined) . 15
5.6 Stress loading . 16
5.6.1 General. 16
5.6.2 Low concentration stress test for small systems . 16
5.6.3 Hydraulic overload stress test for large systems . 16
5.6.4 Power/equipment failure stress test . 16
5.6.5 Vacation stress test . 16
5.6.6 High concentration stress test for small systems . 17
5.6.7 Hydraulic underload stress test for large systems . 17
5.6.8 Wash day stress test for small systems . 17
5.6.9 Disinfection stress test for large systems . 18
6 Sampling and analysis . 18
6.1 General. 18
6.2 Sample frequency . 18
6.3 Analyses. 20
6.3.1 Colour, odour, oily film and foam . 20
6.3.2 Energy consumption . 20
6.4 Criteria for the assessment of the testing . 20
7 Final report . 21
Annex A (normative) List of analytical methods . 22
Annex B (informative) List of national threshold values . 24
Bibliography . 27
Table contents
Table 1 — Hardness and alkalinity of mains water . 9
Table 2 — Preparation of test water for light greywater . 10
Table 3 — Concentration of test water for light greywater . 10
Table 4 — Preparation of test water for laundry water . 11
Table 5 — Concentration of test water for laundry water . 11
Table 6 — Concentration of test water for light greywater and laundry water combined . 12
Table 7 — Testing phases: Schedule and specific loading . 13
Table 8 — Time frame of daily loading for light greywater . 15
Table 9 — Time frame of daily loading for greywater including laundry water . 15
Table 10 — Dosing schedule during vacation stress test . 17
Table 11 — Schedule of wash day stress test . 17
Table 12 — Disinfection compound or alternatives . 18
Table 13 — Water quality monitoring plan . 19
Table A.1 — Analytical methods . 22
Table A.2 — Examples of analytic methods for 6.3.1 (informative) . 23
Table B.1 — List of national threshold values . 24
European foreword
This document (prEN 18247-1:2025) has been prepared by Technical Committee CEN/TC 165
“Wastewater engineering”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
Introduction
Ecology and sustainability are goals of any water management. In this connection greywater harvesting,
treatment and use reduces the potable water demand and the discharge of water.
On-site collection and use of treated greywater cover a variety of applications like toilet flushing, laundry,
landscape irrigation, floor and car cleaning, etc. in single and collective residential buildings, hotels,
offices, commercial centres and sportive premises for instance.
The diversity of reused water applications requires procedures for the evaluation of treatment systems
to assess the achieved water quality.
This document is intended to provide procedure for performance testing of greywater treatment systems.
1 Scope
This document specifies the testing conditions to assess the treatment performances of greywater
systems.
Excluded from the scope of this document are:
— the testing of rainwater harvesting systems;
— the testing of systems for direct use as mentioned in EN 16941-2 “On-site non-potable water systems
- Part 2: Systems for the use of treated greywater”;
— the testing of blackwater treatment systems;
— the testing of wastewater treatment plant.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 872, Water quality — Determination of suspended solids — Method by filtration through glass fibre
filters
EN 1899-2, Water quality — Determination of biochemical oxygen demand after n days (BOD ) — Part 2:
n
Method for undiluted samples (ISO 5815)
EN 16941-2:2021, On-site non-potable water systems — Part 2: Systems for the use of treated greywater
EN 16323, Glossary of wastewater engineering terms
EN ISO 6878, Water quality — Determination of phosphorus — Ammonium molybdate spectrometric
method (ISO 6878)
EN ISO 7027-1, Water quality — Determination of turbidity — Part 1: Quantitative methods (ISO 7027-
1:2016))
EN ISO 7899-1, Water quality — Detection and enumeration of intestinal enterococci in surface and waste
water — Part 1: Miniaturized method (most probable number) by inoculation in liquid medium (ISO 7899-
1)
ISO 9308-2, Water quality — Enumeration of Escherichia coli and coliform bacteria — Part 2: Most
probable number method
EN ISO 9308-3, Water quality — Detection and enumeration of Escherichia coli and coliform bacteria in
surface and wastewater — Part 3: Miniaturized method (most probable number) by inoculation in liquid
medium (ISO 9308-3)
EN ISO 9963-1, Water quality — Determination of alkalinity — Part 1: Determination of total and
composite alkalinity
...
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