Water Hardness in 21550
Deer Park, Maryland · Garrett County
Dataset updated March 9, 2026Matched to 10 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 10 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.
Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.
Water Systems Serving 21550
These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Deep Creek Lake Water Service Area MD1111096 | groundwater | 71 PPM Slightly Hard | |
| Town Of Mountain Lake Park MD0110007 | groundwater | 71 PPM Slightly Hard | |
| Town Of Oakland MD0110008 | surface water | 71 PPM Slightly Hard | |
| Town Of Friendsville MD0110004 | surface water | 71 PPM Slightly Hard | |
| Town Of Kitzmiller MD0110013 | groundwater | 71 PPM Slightly Hard |
Nearby Zip Codes
What This Means For You
Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
Know your water hardness?
If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Deer Park, MD (21550).
Frequently Asked Questions
Is the water hard in Deer Park, MD (21550)?
The average water hardness in 21550 is 71 PPM (4.1 GPG), which is classified as slightly hard.
Do I need a water softener in 21550?
At 71 PPM, your water is relatively soft. A water softener is generally not necessary.
Is hard water in 21550 safe to drink?
Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.
How many water systems serve 21550?
Zip code 21550 in Deer Park, Maryland is served by 10 water systems.
Learn More About Your Water
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