Check out the map / video half a penny per gallon tested more than 100,000 times a year "Drink Tap" Hetch Hetchy Check out the map / video Check out the map / video relies almost entirely on water from the Sierras Check out the map / video Hetch Hetchy quality-tested Check out the map / video Drink Tap San Francisco’s tap water Check out the map / video relies almost entirely on water from the Sierras 1/10 of a penny per liter relies almost entirely on water from the Sierras relies almost entirely on water from the Sierras