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Seminole County, FL Water Quality

Water quality data for 14 public water systems serving Seminole County, Florida — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 15 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

Seminole County Earns a B

Seminole County: 15 communities across 14 water systems. 93.3% have no open violations.

  • Median lead where detected: 1.50 ppb
  • 11 communities with a lead detection, 4 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 93.3% of communities have no open violations
1.5 ppb
Median Lead Level
County-wide, 90th percentile
14
Water Systems
Active CWS & NTNCWS
93%
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
  • Altamonte Springs
    Not detected
    No federal limits exceeded on record
    A
  • Casselberry
    Not detected
    No federal limits exceeded on record
    A
  • Forest City
    Not detected
    No federal limits exceeded on record
    B
  • Fern Park
    1.20 ppb
    No federal limits exceeded on record
    A
  • Black Hammock
    2.10 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Winter Springs
    0.60 ppb
    PFAS above the limit at 2 of 3 sampling points
    C
  • Geneva
    0.90 ppb
    1 violation currently open
    C
  • Sanford
    0.80 ppb
    Copper above the 1,300 ppb action level
    B
  • Chuluota
    3.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Midway
    0.80 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 1.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.5 ppb — 10% of the federal action level
Systems by Lead Level
Under 5 ppb
11
No Data
4

All Cities in Seminole County

Sanford 0.80 ppb B
Altamonte Springs Not detected A
Oviedo 2.10 ppb A
Winter Springs 0.60 ppb C
Casselberry Not detected A
Wekiwa Springs 1.50 ppb A
Lake Mary 2.10 ppb A
Longwood 1.60 ppb A
Forest City Not detected B
Heathrow Not detected B
Fern Park 1.20 ppb A
Chuluota 3.00 ppb B
Midway 0.80 ppb B
Black Hammock 2.10 ppb B
Geneva 0.90 ppb C
Showing 15 cities
No active violations Active violations

About Seminole County Drinking Water

Seminole County is served by 14 water systems covering 15 communities. 93% have no open violations.

Of the communities reporting lead results, 11 recorded a detection, with a median of 1.50 ppb — 10% of the federal action level. 4 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 15 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 Seminole County tap water safe to drink?▼
93% of communities have no open violation. 1 of 15 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Seminole County?▼
Among communities with a detection the median is 1.50 ppb, 10% of the 15 ppb action level. 4 reported none detected and 0 reported no result.
How many water systems serve Seminole County?▼
14 community water systems serve 15 communities here.
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