Domestic water supplies are obtained solely from groundwater sources extracted by wells.

Nitrate concentrations are still rising in many groundwater sources.

You can choose whether to buy them or not, and, coming from groundwater sources, their content is pretty constant.

Permission to do this will depend on the distance of your septic tank from local groundwater sources and other protected areas.

The agency also published guidelines today for states to use in protecting groundwater sources from contamination.

Cleaning up contaminated sites reduces the impact of pollutants on groundwater sources.

Nearly half of the world's population depends on groundwater sources for drinking water supply and for other uses.

Our nature, environment and health are being damaged, and groundwater sources may also be contaminated.

In many countries people do this because the groundwater sources have been contaminated by pollution.

The Aegean islands are partly supplied by local groundwater sources.