Water Hardness in Baltimore, MD
Maryland · 21 zip codes · 3 matched water systems
City avg (weighted): 120 PPM
Dataset updated March 9, 20263 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
How this city reading is built
This city reading is a weighted rollup across 3 matched water systems and 21 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
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 in Baltimore
These systems are matched to Baltimore, MD. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
City Of Baltimore MD0300002 | surface water | 120 PPM Moderately HardUSGS estimate: 295 PPM | |
Keswick Multi-Care Center MD0300005 | surface water | 85 PPM Slightly HardUSGS estimate: 33 PPM | |
Campus Hills Water Works MD0120007 | groundwater | 85 PPM Slightly HardUSGS estimate: 33 PPM |
Zip Codes in Baltimore, MD
What This Means For You
Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Moderately Hard Water
Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your Water
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 Baltimore, MD.
Frequently Asked Questions
How hard is the water in Baltimore, MD?
The citywide weighted average water hardness in Baltimore, MD is 120 PPM (7 GPG), classified as moderately hard. This is based on 3 matched water systems.
Do I need a water softener in Baltimore, MD?
With a citywide average hardness of 120 PPM, a water softener is worth considering for homes in Baltimore. Confirm your tap reading before sizing equipment.
Is hard water in Baltimore, MD 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 Baltimore, MD?
Baltimore, Maryland is served by 3 matched water systems across 21 zip codes.
Learn More About Your Water
Do You Need a Water Softener? (Based on Your Water Hardness)
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Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.
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We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.
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