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Portland, OR

TDS = 29 ppm
Hardness (as CaCO3) = 7.9 ppm
Alkalinity (as CaCO3) = 12 ppm

Now that's soft water!

See (PDF) for the complete report.

pH is 7.9. The city adds "sodium hydroxide to increase the pH of the water to reduce corrosion of plumbing systems. This treatment helps control lead and copper levels at customers' taps should these metals be present in the customers' home plumbing."

Portland's primary water supply comes from the Bull Run Reserve, a forested watershed near Mt. Hood. The city occassionally mixes groundwater from several well fields when Bull Run supplies are low or are too turbid. The well water adds some hardness but not much. Much more info can be found at

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