# ISO 9998:1991 — Withdrawn and superseded ISO standards

For ISO 9998:1991, item title is Water quality — Practices for evaluating and controlling microbiological colony count media used in water quality tests; status code is 9599; successor is ISO 11133:2014; withdrawn / published date is 1991-10-17, recorded from its source on 2026-08-05.

- **Identifier:** ISO 9998:1991 _(verified: appears in the quote below)_
- **Item title:** Water quality — Practices for evaluating and controlling microbiological colony count media used in water quality tests _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 11133:2014
- **Withdrawn / published date:** 1991-10-17 _(verified: appears in the quote below)_

## What the source says

> 17933,IS,,ISO 9998:1991,Water quality — Practices for evaluating and controlling microbiological colony count media used in water quality tests,Qualité de l'eau — Techniques d'évaluation et de contrôle des milieux microbiologiques servant au comptage des colonies pour les essais d'évaluation de la qualité de l'eau,1991-10-17,1,['07.100.20'],ISO/TC 147/SC 4,9599,,[53610],"['en','fr']",22,"<p>Describes a method used for the comparison and evaluation of the same medium prepared from different lots of materials, and deals with the comparison and evaluation of different media which are used for the same purpose. Annexes A and B form an integral part of this Standard.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).