fThe Jose Antonio Alzate Reservoir, fed by the
Lerma river, can store up to 45=106 m3 of
water. It is the first significant water reservoir
downstream of the main industrial areas of the
State of Mexico. There are approximately 2500
industrial discharges between the river source
and the Alzate Reservoir which makes the Lerma
river and the Jose Antonio Alzate Reservoir the
most contaminated water bodies in the State of
Mexico. The Monitoring National Network recognises
these waters as highly contaminated, especially
in the zone located between the Mexico]
Toluca highway and the Alzate Reservoir Secre-
tar´ıa de Ecolog´ıa, 1993..