Is Rockville tap water safe to drink?

Yes but with caveats

Rockville's water meets EPA minimum standards but has some concerns including PFAS detected. Filtration is recommended for sensitive individuals.

67/100

Purity Score

Issues Found

4.8 GPG

Hardness

Detected

PFAS

3 Issues Detected in Rockville

PFAS (Forever Chemicals) Detected

PFAS are man-made chemicals that do not break down and accumulate in the body.

PFAS details for Rockville

Moderate Chlorine Level

Chlorine within EPA limits but may affect taste.

Chlorine info for Rockville

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Rockville

Fix Your Water — See Recommended Filters

Maryland

208,502,085,120,852 · Potomac River

Rockville PFAS Water Analysis (2026)

Moderate Risk Updated March 2026 68,179 residents

See Best Filters for Rockville

Purity Score

PFAS compounds have been identified in Rockville's public water supply. This report covers detection levels, health context, and the filtration options best suited to Rockville residents.

Water Quality Data

PFAS

Detected (1.8 ppt)

PFAS detected. RO filter recommended.

PFAS in Rockville

Lead

Not detected (3.2 ppb)

Hard water in Rockville

Chlorine

Medium

Affects taste and skin. Carbon filter removes it.

Learn about chlorine

TDS

Unknown

High TDS (>500 ppm) may affect taste.

Contaminant Levels

PFAS

1.8 ppt

Lead

3.2 ppb

Nitrate

0.6 mg/L

Arsenic

0.2 mg/L

Hardness

4.8 gpg

Health Insights

1
PFAS have been identified in Rockville's water at 1.8 parts per trillion. A reverse osmosis system is the most reliable home treatment.
2
Chlorine levels may affect the taste of Rockville's tap water. A carbon filter improves flavor.

Score

67 /100

Moderate

"Good" threshold (70)

Rockville tap water is sourced from Potomac River and treated by Washington Suburban Sanitary Commission. PFAS forever chemicals have been detected. Overall purity score: 67/100 (Moderate). Updated for 2026.

Fix Your Water

Best filters matched to Rockville's 3 issues.

See Filters

MATCHED TO ROCKVILLE'S WATER DATA

Best Water Filters for Rockville, MD (2026)

Matched to PFAS Detected, Moderate Chlorine in Rockville.

PFAS Detected Moderate Chlorine

Best Overall #1 for Rockville

Clearly Filtered Water Pitcher

Pitcher Filter

$80-95

Why this fits Rockville

Removes 99%+ of PFAS detected in Rockville's water
Eliminates chlorine taste and odor from Rockville's water
NSF/ANSI 42 + NSF/ANSI 53 + NSF/ANSI 401 certified

Pros & Cons +

No installation fill and pour

Removes 365+ contaminants including PFAS

Small capacity 2-3 people

Filter replacements every 4 months

Fix Your Water — Check Price

Best for PFAS

Waterdrop G3P800 Tankless RO

Tankless Reverse Osmosis

$380-450

Why this fits Rockville

Removes 99%+ of PFAS detected in Rockville's water
Eliminates chlorine taste and odor from Rockville's water
NSF/ANSI 58 + NSF 372 certified

Pros & Cons +

No tank saves cabinet space

800 GPD fast flow rate

Higher upfront cost

Filter replacements are proprietary

Check Price on Amazon

Best for Taste

APEC Water Systems ROES-50

Under-Sink Reverse Osmosis

$195-220

Why this fits Rockville

Removes 99%+ of PFAS detected in Rockville's water
Eliminates chlorine taste and odor from Rockville's water
NSF/ANSI 58 certified

Pros & Cons +

5-stage filtration removes 99%+ of contaminants

Long-lasting filters (6-12 month replacement)

Requires under-sink installation

Wastes some water during filtration

Check Price on Amazon

Best Value

Waterdrop 10UA Under-Sink Filter

Under-Sink Carbon Filter

$40-60

Why this fits Rockville

Eliminates chlorine taste and odor from Rockville's water
NSF/ANSI 42 certified
Budget-friendly at $40-60

Pros & Cons +

Very affordable

Easy DIY install no plumber

Does not remove PFAS or hardness

Single point of use only

Check Price on Amazon

As an Amazon Associate, PurityMap may earn from qualifying purchases. Based on latest Rockville water data.

Full Filter Comparison for Rockville

Know exactly what's in YOUR tap

City data shows averages. Your home may differ.

Test Your Water — $25-30

About Rockville's Water

PFAS Water Contamination: What Rockville Residents Should Know

PFAS have been detected in Rockville's water supply at 1.8 parts per trillion. Health agencies including the EPA have set limits on certain PFAS compounds in drinking water due to concerns about long-term exposure. While municipal treatment reduces many contaminants, standard water treatment does not fully remove PFAS. Point-of-use reverse osmosis filtration is the most effective home solution confirmed to remove PFAS at the 99%+ level.

Explore Rockville Water Data

Rockville Water FAQ

Is Rockville MD tap water safe to drink in 2026?

Rockville tap water meets EPA federal drinking water standards and scores 67/100 (Moderate) on PurityMap for 2026. PFAS forever chemicals have been detected at 1.8 ppt. An NSF-certified filter is strongly recommended. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.

Does Rockville MD use chlorine or chloramine for disinfection?

Rockville uses chloramine as the primary disinfectant with a residual level of 1.5 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.

How hard is Rockville MD water and what is the TDS level?

Rockville water hardness is 4.8 grains per gallon (moderate) with a TDS of 165 ppm (good). This level is unlikely to cause significant scale buildup in household plumbing.

Has PFAS been found in Rockville MD drinking water?

Yes. PFAS forever chemicals have been detected in Rockville water at approximately 1.8 ppt according to EPA UCMR5 monitoring data. A reverse osmosis or NSF P473-certified filter is the most effective residential solution.

What is the best water filter for Rockville?

Based on Rockville's water profile, we recommend the Clearly Filtered Water Pitcher. Rockville: PFAS detected or elevated lead risk. Reverse osmosis is the only residential technology proven to reduce both below detection limits. TDS will also drop significantly.

Nearby Reports

GaithersburgMaryland — 67/100 BowieMaryland — 67/100 BaltimoreMaryland — 77/100 FrederickMaryland — 82/100 AnnapolisMaryland — 82/100

All Maryland cities

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Data Sources

EPA SDWIS
EWG Tap Water Database
Washington Suburban Sanitary Commission CCR
USGS monitoring data

PurityMap compiles public data. Updated March 2026.

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