Is DC Tap Water Safe to Drink?
Water quality data for 1 cities across DC. Find your city below.
Water quality in DC varies significantly from city to city. Across 1 cities we track, hardness ranges from 120 PPM in Washington to 120 PPM in Washington, with a statewide average of 120 PPM. 1 of 1 cities have hard water above 120 PPM where a water softener provides measurable benefits.
1
Cities
120
Avg Hardness (PPM)
120
Hardest City (PPM)
DC Cities by Water Hardness
| City | Hardness (PPM) | Level | PFAS (ppt) | Source |
|---|---|---|---|---|
| Washington | 120 | Hard | 7.65 | Potomac River |
Frequently Asked Questions About DC Water
Is DC tap water safe to drink?
DC tap water meets EPA legal standards in most cities. The statewide average hardness of 120 PPM means most homes deal with hard water effects like scale buildup, though hardness is not a health concern. Check your specific city above for detailed data.
Do I need a water softener in DC?
It depends on your city. DC averages 120 PPM overall, but hardness varies significantly. 100% of cities exceed 120 PPM. Look up your city above to see if you need one.
Which DC city has the hardest water?
Washington has the hardest water in DC at 120 PPM (7 GPG).
What contaminants are in DC water?
The most common concerns across DC are hard water minerals (calcium and magnesium). Each city has different levels - check your city above for specific contaminant data.
How much does a water softener cost in DC?
A whole-house water softener for a typical DC home costs $800-$2,500 installed, depending on capacity and brand. At 120 PPM average hardness, most homes need a 32,000-48,000 grain system. Full cost breakdown.