District of Columbia
The 1 hardness figures we’ve verified run from 8.0 to 8.0 grains per gallon, with a median of 8.0; 100% are hard or very hard.
How the 1 figures spread across the bands
- Soft 0
- Slightly hard 0
- Moderately hard 0
- Hard 1
- Very hard 0
- Hardness
- 8.0 gpg medianAverage 8.0 gpg (137 ppm), from 8.0 to 8.0. Each published figure counts once in the average, median and spread; a figure published as a range is shown as its range and isn't averaged.
- Coverage
- 1 places1 listings as published
Every place we have
Sources are each city’s water quality report or its utility. Gather the listings up by place or by the water system that serves them, or see every listing as published; open a group to see what’s in it.
1 place
| On the scale | Disinfectant | Sources | Ask Aqua | ||
|---|---|---|---|---|---|
Washington |
8.0 gpg135 ppm, hard | SoftSlightly hardModerately hardHardVery hardHard 8.0 gpg |
– | Hardness |
Missing your city? Aquatell researches cities on request from the utility’s own reports, usually within a week. A note on a figure says what we found when we checked it: units that didn’t agree, another page with a different figure, a range.
What to do about it
Hard water
Above about 3.5 grains per gallon, scale builds in water heaters, fixtures and appliances. A softener sized for your hardness and household removes it for the whole house.
Chlorine or chloramine
Standard carbon removes chlorine’s taste and smell. Chloramine lasts longer in the pipes and needs catalytic carbon to remove it.
Not sure what you need?
Aqua knows these figures and Aquatell’s treatment charts, and can size a system for your home.
