States › Maryland › Montgomery County

Montgomery County, MD Water Quality

Water quality data for 3 public water systems serving Montgomery County, Maryland — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 3 water systems · 58 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Montgomery County Earns a A

Montgomery County: 58 communities across 3 water systems. 100.0% have no open violations.

  • Median lead where detected: 5.00 ppb
  • 1 communities with a lead detection, 57 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
5 ppb
Median Lead Level
County-wide, 90th percentile
3
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Germantown
    Not detected
    No federal limits exceeded on record
    A
  • Gaithersburg
    Not detected
    No federal limits exceeded on record
    A
  • Bethesda
    Not detected
    No federal limits exceeded on record
    A
  • Silver Spring
    Not detected
    No federal limits exceeded on record
    A
  • Wheaton
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Poolesville
    5.00 ppb
    PFAS above the limit at 5 of 8 sampling points
    C
  • Germantown
    Not detected
    No federal limits exceeded on record
    A
  • Gaithersburg
    Not detected
    No federal limits exceeded on record
    A
  • Bethesda
    Not detected
    No federal limits exceeded on record
    A
  • Silver Spring
    Not detected
    No federal limits exceeded on record
    A
County Lead Level — Median 5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 5 ppb — 33.3% of the federal action level
Systems by Lead Level
5 – 10 ppb
1
No Data
57

All Cities in Montgomery County

Germantown Not detected A
Gaithersburg Not detected A
Bethesda Not detected A
Silver Spring Not detected A
Wheaton Not detected A
North Bethesda Not detected A
Potomac Not detected A
Aspen Hill Not detected A
Rockville Not detected A
Olney Not detected A
Montgomery Village Not detected A
Clarksburg Not detected A
North Potomac Not detected A
Fairland Not detected A
Redland Not detected A
Takoma Park Not detected A
White Oak Not detected A
Damascus Not detected A
Calverton Not detected A
Cloverly Not detected A
Glenmont Not detected A
Flower Hill Not detected A
Kemp Mill Not detected A
Colesville Not detected A
Travilah Not detected A
North Kensington Not detected A
Leisure World Not detected A
Burtonsville Not detected A
South Kensington Not detected A
Four Corners Not detected A
Chevy Chase Not detected A
Forest Glen Not detected A
Hillandale Not detected A
Layhill Not detected A
Poolesville 5.00 ppb C
Friendship Heights Village Not detected A
Ashton-Sandy Spring Not detected A
Darnestown Not detected A
Brookmont Not detected A
Burnt Mills Not detected A
Chevy Chase Not detected A
Derwood Not detected A
Cabin John Not detected A
Kensington Not detected A
Chevy Chase Village Not detected A
Spencerville Not detected A
Somerset Not detected A
Chevy Chase View Not detected A
Garrett Park Not detected A
Martin's Additions Not detected A
Chevy Chase Section Three Not detected A
Chevy Chase Section Five Not detected A
Ten Mile Creek Not detected A
Laytonsville Not detected A
Washington Grove Not detected A
North Chevy Chase Not detected A
Glen Echo Not detected A
Brookeville Not detected A
Showing 58 cities
No active violations Active violations

About Montgomery County Drinking Water

Montgomery County is served by 3 water systems covering 58 communities. No community here has an open violation on record.

Of the communities reporting lead results, 1 recorded a detection, with a median of 5.00 ppb — 33% of the federal action level. 57 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 58 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Montgomery County tap water safe to drink?▼
No community in Montgomery County has an open violation on record. 1 of 58 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Montgomery County?▼
Among communities with a detection the median is 5.00 ppb, 33% of the 15 ppb action level. 57 reported none detected and 0 reported no result.
How many water systems serve Montgomery County?▼
3 community water systems serve 58 communities here.
← Back to Maryland water quality overview