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
Is Baltimore, MD Water Hard or Soft?
The displayed hardness for Baltimore, MD is 120 PPM (7 GPG) from City Of Baltimore, classified as moderately hard. The citywide weighted average is 120 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
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
Use this city 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 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
How to Test Water Hardness at Home
Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
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10 min readPPM to GPG Converter + Water Hardness Scale Explained
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