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Lehigh County, PA Water Quality

Water quality data for 19 public water systems serving Lehigh County, Pennsylvania — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 19 water systems · 25 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Lehigh County Earns a B

Lehigh County: 25 communities across 19 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 18 communities with a lead detection, 6 reporting none detected
  • 5 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 ppb
Median Lead Level
County-wide, 90th percentile
19
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
  • Whitehall
    Not detected
    No federal limits exceeded on record
    A
  • Upper Saucon
    Not detected
    No federal limits exceeded on record
    A
  • Salisbury
    3.00 ppb
    No federal limits exceeded on record
    A
  • Fountain Hill
    Not detected
    No federal limits exceeded on record
    A
  • North Whitehall
    1.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Emmaus
    3.00 ppb
    PFAS above the limit at 4 of 4 sampling points
    C
  • Upper Milford
    25.30 ppb
    Lead above the 15 ppb action level
    C
  • Lower Macungie
    2.00 ppb
    PFAS above the limit at 2 of 14 sampling points
    C
  • Upper Macungie
    2.00 ppb
    PFAS above the limit at 2 of 14 sampling points
    C
  • Weisenberg
    2.00 ppb
    PFAS above the limit at 2 of 14 sampling points
    C
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
10
5 – 10 ppb
6
10 – 15 ppb
2
No Data
7

All Cities in Lehigh County

Allentown 7.00 ppb A
Lower Macungie 2.00 ppb C
Upper Macungie 2.00 ppb C
Whitehall Not detected A
South Whitehall 6.00 ppb B
Emmaus 3.00 ppb C
Upper Saucon Not detected A
Salisbury 3.00 ppb A
Catasauqua 5.00 ppb A
Fountain Hill Not detected A
North Whitehall 1.00 ppb A
Slatington Not detected A
Coplay Not detected A
Dorneyville 3.00 ppb A
Macungie 5.00 ppb B
Coopersburg 5.00 ppb B
Alburtis 5.00 ppb B
Washington 10.00 ppb B
Hanover Not detected A
Weisenberg 2.00 ppb C
Upper Milford 25.30 ppb C
Heidelberg 2.00 ppb B
Lynn Not reported B
Lower Milford 2.00 ppb B
Lowhill 2.00 ppb C
Showing 25 cities
No active violations Active violations

About Lehigh County Drinking Water

Lehigh County is served by 19 water systems covering 25 communities. No community here has an open violation on record.

Of the communities reporting lead results, 18 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 6 reported none detected, which means below the laboratory limit rather than an absence of lead.

5 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 significant deficiencies at 1 of them.

Frequently Asked Questions

Is Lehigh County tap water safe to drink?▼
No community in Lehigh County has an open violation on record. 5 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Lehigh County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 6 reported none detected and 1 reported no result.
How many water systems serve Lehigh County?▼
19 community water systems serve 25 communities here.
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