Comparision of conductivity

Base. Pure water doesn't conduct electricity.

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Typical conductivity of waters:
Ultra pure water 5.5 · 10^-6 S/m
Drinking water 0.005 – 0.05 S/m
Sea water 5 S/m

If the electric field is strong enough the molecules are broken and current is conducted by the ions.

Conductivity, or its reciprocal resistivity, is used as an indicator of the purity of water. Theoretically pure water conducts very little electricity, and personal experience suggests that ultrapure water can support static electricity build-up within it for short periods, in a similar way to organic fluids, when subjected to sudden flow disturbances and high pipe velocity.

Sea water, for contrast, conducts electricity much better owing to the high concentration of ions carried within it.

There are rules-of-thumb to relate the measured conductivity to the Total Dissolved Solids levels around the drinking water levels of purity at everyday temperatures. The World Health Organisation standards for drinking water are not particularly severe as regards ionic purity, and many borehole waters in the UK require very little ionic treatment to become suitable for drinking.