City water profile

Water hardness in Baltimore

Find official utility reports, understand hardness, and check the water system serving your home in Baltimore, Maryland.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 1
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

City Of Baltimore

MD0300002 · Surface water · 1,600,000 people served system-wide

A municipal system, in-state city, and served county all agree with this Census ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0027 mg/L
Action level: 0.015 mg/L

18% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

TTHM

EPA SDWIS reported health-based violation

Reported violation

Reported level: 81 UG/L
Maximum contaminant level: 0.08 UG/L

101250% of the listed benchmark

Monitoring period: Jan 1, 2026 to Mar 31, 2026

Violation history (9)

Imported violation history for City Of Baltimore
Rule	Status	Period
TTHMHealth-based	Archived	Jan 1, 2026 to Mar 31, 2026
LEAD AND COPPER RULE REVISIONS	Resolved	Jul 2, 2025 to Jul 2, 2025
Chlordane	Resolved	Apr 1, 2023 to Jun 30, 2023
Toxaphene	Resolved	Apr 1, 2023 to Jun 30, 2023
Toxaphene	Resolved	Apr 1, 2023 to Jun 30, 2023
Chlordane	Resolved	Apr 1, 2023 to Jun 30, 2023
Nitrate	Resolved	Jan 1, 2023 to Dec 31, 2023
Public Notice	Resolved	Sep 5, 2022 to Sep 6, 2022
Revised Total Coliform RuleHealth-based	Resolved	Sep 1, 2022 to Sep 30, 2022

City summary

What the indexed records say

Baltimore has 23 published ZIP profiles across Baltimore City County. The regional-evidence median is 102 PPM. The city does not meet the stricter comparison standard.

The 102–211 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard13 ZIPs

Hard0 ZIPs

Very hard1 ZIP

14 of 23 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 23.7 miles
Profiles with evidence: 14/23

Confidence labels

High: 0Moderate: 0Low: 14

Observation window: Aug 30, 2022 to May 1, 2026.

ZIP directory

Water reports in Baltimore

Open a ZIP for site-level provenance and measurements.

ZIP code

21201

Moderately Hard

102 PPM

Nearest site: 23.7 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21202

Moderately Hard

102 PPM

Nearest site: 24 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21205

Moderately Hard

102 PPM

Nearest site: 24.9 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21206

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21210

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21211

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21212

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21213

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21214

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21215

Very Hard

211 PPM

Nearest site: 24.4 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21216

Moderately Hard

102 PPM

Nearest site: 24.5 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21217

Moderately Hard

102 PPM

Nearest site: 24.4 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21218

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21223

Moderately Hard

102 PPM

Nearest site: 22.7 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21224

Moderately Hard

102 PPM

Nearest site: 23.6 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21226

Moderately Hard

102 PPM

Nearest site: 18.8 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21229

Moderately Hard

102 PPM

Nearest site: 22.7 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21230

Moderately Hard

102 PPM

Nearest site: 21.9 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21231

Moderately Hard

102 PPM

Nearest site: 23.6 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21233

Moderately Hard

102 PPM

Nearest site: 23.7 mi
Confidence: Low

View full ZIP evidence →

ZIP code

21239

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21251

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

21287

Moderately Hard

102 PPM

Nearest site: 24.4 mi
Confidence: Low

View full ZIP evidence →

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Maryland communities

Bowie

Prince George'S County

94 PPM median

Havre De Grace

Harford County

83 PPM median

Hagerstown

Washington County

81 PPM median

Prince Frederick

Calvert County

127 PPM median

Taneytown

Carroll County

77 PPM median

Stevensville

Queen Anne'S County

75 PPM median

Search all 15 Maryland cities →

Questions people ask

About water in Baltimore

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.