Groundwater sources

According to a US congressional study, groundwater contamination will become a principle environmental concern for the next decades. Once contaminated by toxic organic chemicals, groundwater can remain polluted for hundreds or thousands
of years, if not for geological periods of time, because nature supplies few, if any, cleansing or diluting processes for groundwater.

The most common sources of this pollution are the thousands upon thousands of industrial waste sites, leaking underground storage tanks, improperly treated sewage and, probably the most common of all, agricultural chemicals trickling and
seeping into underground water aquifers. Millions of private and municipal water wells and storage lakes are either contaminated now, or are in danger of becoming contaminated as chemicals creep through these aquifers. A recent example of underground tank leakage was the appearance of MTBE (a petrol performance improver) in groundwater, leaking from petrol station storage tanks – which has led to the phasing out of MTBE as an additive.

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