Clean Drinking Water from the Tap in Tokyo

Narrator: Safe drinking water is the ultimate concern of everyone. While
Tokyo’s tap water meets international standards for safe drinking
water, that doesn’t reassure everyone.

Interviewee: I buy mineral water.

Interviewer: What brand?

Interviewee: My favorite brand is Volvic.

Interviewee: I don’t drink water out of tap at all, and I don’t use it for my
cooking also.

Narrator: Eleven water treatment plans provide clean drinking water for the
citizens and industries of Tokyo. At the number four, Misato
purification plant, two different lines are in place to clean the
water. Sludge fills, filtration and aeration are the same in both
lines. Sodium hypochlorite is added to kill bacteria. An advanced
line adds active charcoal filtration and ozone treatment to produce
a very high quality drinking water. Unfortunately, the high cost of
the advanced line means that the output of the two lines is blended
before the water is delivered to Tokyo citizens.