States › Maryland › Frederick County

Frederick County, MD Water Quality

Water quality data for 15 public water systems serving Frederick County, Maryland — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 15 water systems · 25 cities
✅
Excellent — All Systems Performing Well

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

A

Frederick County Earns a A

Frederick County: 25 communities across 15 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 20 communities with a lead detection, 4 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 ppb
Median Lead Level
County-wide, 90th percentile
15
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
  • Frederick
    1.10 ppb
    No federal limits exceeded on record
    A
  • Ballenger Creek
    3.00 ppb
    No federal limits exceeded on record
    A
  • Urbana
    3.00 ppb
    No federal limits exceeded on record
    A
  • Linganore
    3.00 ppb
    No federal limits exceeded on record
    A
  • Brunswick
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Thurmont
    4.00 ppb
    PFAS above the limit at 3 of 3 sampling points
    C
  • Graceham
    4.00 ppb
    PFAS above the limit at 3 of 3 sampling points
    C
  • Emmitsburg
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Braddock Heights
    1.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Jefferson
    1.00 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3 ppb — 20% of the federal action level
Systems by Lead Level
Under 5 ppb
19
10 – 15 ppb
1
No Data
5

All Cities in Frederick County

Frederick 1.10 ppb A
Ballenger Creek 3.00 ppb A
Urbana 3.00 ppb A
Linganore 3.00 ppb A
Brunswick Not detected A
Walkersville Not detected A
Thurmont 4.00 ppb C
Spring Ridge 3.00 ppb A
Middletown 2.00 ppb B
Emmitsburg Not detected B
Bartonsville 3.00 ppb A
Monrovia 3.00 ppb A
Adamstown 3.00 ppb A
Green Valley 1.70 ppb B
Point of Rocks 3.00 ppb A
Braddock Heights 1.00 ppb B
Myersville 2.40 ppb B
New Market 3.00 ppb A
Jefferson 1.00 ppb B
Woodsboro 13.00 ppb B
Buckeystown 3.00 ppb A
Libertytown Not detected B
Rosemont Not reported B
Graceham 4.00 ppb C
Sabillasville 3.86 ppb B
Showing 25 cities
No active violations Active violations

About Frederick County Drinking Water

Frederick County is served by 15 water systems covering 25 communities. No community here has an open violation on record.

Of the communities reporting lead results, 20 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 4 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 25 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 Frederick County tap water safe to drink?▼
No community in Frederick County has an open violation on record. 2 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Frederick County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 4 reported none detected and 1 reported no result.
How many water systems serve Frederick County?▼
15 community water systems serve 25 communities here.
← Back to Maryland water quality overview