States › Pennsylvania › Delaware County

Delaware County, PA Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 3 water systems · 54 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Delaware County Earns a C

Delaware County: 54 communities across 3 water systems. 100.0% have no open violations.

  • Median lead where detected: 4.76 ppb
  • 17 communities with a lead detection, 37 reporting none detected
  • 38 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
4.76 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
  • Chester
    4.76 ppb
    No federal limits exceeded on record
    A
  • Upper Chichester
    4.76 ppb
    No federal limits exceeded on record
    A
  • Aston
    4.76 ppb
    No federal limits exceeded on record
    A
  • Concord
    4.76 ppb
    No federal limits exceeded on record
    A
  • Brookhaven
    4.76 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Upper Darby
    Not detected
    PFAS above the limit at 13 of 19 sampling points
    C
  • Haverford
    Not detected
    PFAS above the limit at 13 of 19 sampling points
    C
  • Radnor
    Not detected
    PFAS above the limit at 13 of 19 sampling points
    C
  • Ridley
    Not detected
    PFAS above the limit at 13 of 19 sampling points
    C
  • Springfield
    Not detected
    PFAS above the limit at 13 of 19 sampling points
    C
County Lead Level — Median 4.76 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 4.76 ppb — 31.7% of the federal action level
Systems by Lead Level
Under 5 ppb
17
No Data
37

All Cities in Delaware County

Upper Darby Not detected C
Haverford Not detected C
Radnor Not detected C
Chester 4.76 ppb A
Ridley Not detected C
Springfield Not detected C
Marple Not detected C
Upper Chichester 4.76 ppb A
Middletown Not detected C
Aston 4.76 ppb A
Newtown Not detected C
Concord 4.76 ppb A
Yeadon Not detected C
Nether Providence Not detected C
Lansdowne Not detected C
Upper Providence Not detected C
Darby Not detected C
Darby Not detected C
Collingdale Not detected C
Villanova Not detected C
Brookhaven 4.76 ppb A
Glenolden Not detected C
Ridley Park Not detected C
Clifton Heights Not detected C
Folcroft Not detected C
Swarthmore Not detected C
Prospect Park Not detected C
Sharon Hill Not detected C
Norwood Not detected C
Media Not detected C
Bethel 3.00 ppb C
Aldan Not detected C
Chester 4.76 ppb A
Tinicum Not detected C
Linwood 4.76 ppb A
Thornbury 4.76 ppb A
Edgmont Not detected C
Rosemont Not detected C
Lower Chichester 4.76 ppb A
Upland 4.76 ppb A
Morton Not detected C
East Lansdowne Not detected C
Chadds Ford 4.76 ppb A
Colwyn Not detected C
Eddystone Not detected C
Marcus Hook 4.76 ppb A
Parkside 4.76 ppb A
Trainer 4.76 ppb A
Chester Heights 4.76 ppb A
Haverford College Not detected C
Millbourne Not detected C
Rose Valley Not detected C
Rutledge Not detected C
Cheyney University 4.76 ppb A
Showing 54 cities
No active violations Active violations

About Delaware County Drinking Water

Delaware County is served by 3 water systems covering 54 communities. No community here has an open violation on record.

Of the communities reporting lead results, 17 recorded a detection, with a median of 4.76 ppb — 32% of the federal action level. 37 reported none detected, which means below the laboratory limit rather than an absence of lead.

38 of 54 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 Delaware County tap water safe to drink?▼
No community in Delaware County has an open violation on record. 38 of 54 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Delaware County?▼
Among communities with a detection the median is 4.76 ppb, 32% of the 15 ppb action level. 37 reported none detected and 0 reported no result.
How many water systems serve Delaware County?▼
3 community water systems serve 54 communities here.
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