Guidelines for Drinking-Water Quality, Second Edition, Addendum
to Volume 1: Recommendations
1998, viii + 36 pages (available in English; French and Spanish in
preparation) ISBN 92 4 154514 3, CHF 14.-/USD 12.60;In developing
countries: CHF 9.80. Order no. 1154404.
This addendum to Volume 1 of Guidelines for Drinking-Water Quality
summarizes new findings that have become available since the second
edition was published in 1993, and that call for a reconsideration
of selected guideline values issued at that time. In addition, guideline
values for four substances are presented here for the first time.
The addendum is part of WHO's ongoing effort to ensure that recommendations
about the safety of chemical substances found in drinking water are
in line with the latest scientific data.
For some of the substances under review, previously established guideline
values have been revised in the light of new evidence. For others,
new findings confirm the continuing validity of previous recommendations.
In addition, guideline values for four substances are presented here
for the first time.
Updated or new evaluations are provided for seven inorganic substances
(aluminium, boron, copper, nickel, nitrate, nitrite, and uranium),
four organic substances (edetic acid, microcystin-LR, benzo[a]pyrene,
and fluoranthene), ten pesticides (bentazone, carbofuran, cyanazine,
1,2-dibromoethane, 2,4-dichlorophenoxyacetic acid, 1,2 dichloropropane,
diquat, glyphosate, pentachlorophenol, and terbuthylazine), and a
disinfectant by-product (chloroform).
Evaluations of chemical substances published in this addendum supersede
evaluations of the same substances previously published in Volume
1 of the Guidelines.
The guideline values recommended by WHO are not mandatory limits.
Such limits should be set by national or regional authorities, using
a risk-benefit approach and taking into consideration local environmental,
social, economic, and cultural conditions.
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