Question

of these options, which is an example of a point source of water pollution?
the salt from road deicing is swept into the storm sewers of the city.
a rainstorm flushes litter and pet waste from surrounding parks into a nearby lake.
fertilizers and pesticides from the valley’s farming operations seep into the groundwater.
a housing development is built over a garbage dump that was buried and abandoned.

Explanation:

A point - source of water pollution is a specific, identifiable source from which pollutants are discharged. The salt from road de - icing being swept into storm sewers is a single, identifiable source. The other options involve multiple sources or non - point sources such as runoff from large areas (rainstorm flushing litter, farming operations seeping into groundwater) or non - water pollution related activities (housing development over a dump).

Answer:

The salt from road deicing is swept into the storm sewers of the city.