Seminole County Water Quality: 7 Cities Ranked by the Records
Seminole County, Florida: 7 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems of 7 tested4.0 ng/L federal MCL (2024) · US EPAHighest6.9 ng/L
- WINTER SPRINGS, CITY OF (3 WPS)6.9 ng/LSample date: 2024-10-17 to 2025-04-09
- SANFORD, CITY OF (2 WPS)4.7 ng/LSample date: 2023-06-07 to 2023-10-11
- CASSELBERRY, CITY OF (3 WPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-10 to 2024-07-15
- LAKE MARY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-27 to 2024-04-09
- LONGWOOD, CITY OF (2 WPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANLANDO (3 WTPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
Perfluorooctanoic acid (PFOA)Detected in 1 system of 7 tested4.0 ng/L federal MCL (2024) · US EPAHighest5 ng/L
- WINTER SPRINGS, CITY OF (3 WPS)5 ng/LSample date: 2024-10-17 to 2025-04-09
- CASSELBERRY, CITY OF (3 WPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-10 to 2024-07-15
- LAKE MARY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-27 to 2024-04-09
- LONGWOOD, CITY OF (2 WPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANFORD, CITY OF (2 WPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-07 to 2023-10-11
- SANLANDO (3 WTPS)Not detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
Perfluorohexanesulfonic acid (PFHxS)Detected in 4 systems of 7 tested10 ng/L federal MCL (2024) · US EPAHighest3.6 ng/L
- LAKE MARY, CITY OF3.6 ng/LSample date: 2023-10-27 to 2024-04-09
- WINTER SPRINGS, CITY OF (3 WPS)3.3 ng/LSample date: 2024-10-17 to 2025-04-09
- CASSELBERRY, CITY OF (3 WPS)3.2 ng/LSample date: 2024-01-10 to 2024-07-15
- SANFORD, CITY OF (2 WPS)3.1 ng/LSample date: 2023-06-07 to 2023-10-11
- LONGWOOD, CITY OF (2 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANLANDO (3 WTPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
Lead (90th percentile)Detected in 6 systems of 7 tested15 µg/L federal action level · US EPAHighest2.1 µg/L
- LAKE MARY, CITY OF2.1 µg/LMonitoring period: 2023–2023
- OVIEDO, CITY OF2.1 µg/LMonitoring period: 2023–2023
- LONGWOOD, CITY OF (2 WPS)1.6 µg/LMonitoring period: 2023–2023
- SANLANDO (3 WTPS)1.5 µg/LMonitoring period: 2023–2023
- SANFORD, CITY OF (2 WPS)0.8 µg/LMonitoring period: 2023–2023
- WINTER SPRINGS, CITY OF (3 WPS)0.6 µg/LMonitoring period: 2023–2023
- CASSELBERRY, CITY OF (3 WPS)Not detectedMonitoring period: 2025–2025
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 7 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.8 ng/L
- LAKE MARY, CITY OF3.8 ng/LSample date: 2023-10-27 to 2024-04-09
- SANFORD, CITY OF (2 WPS)3.6 ng/LSample date: 2023-06-07 to 2023-10-11
- CASSELBERRY, CITY OF (3 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-10 to 2024-07-15
- LONGWOOD, CITY OF (2 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANLANDO (3 WTPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
- WINTER SPRINGS, CITY OF (3 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-17 to 2025-04-09
Perfluorohexanoic acid (PFHxA)Detected in 2 systems of 7 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest4.2 ng/L
- LAKE MARY, CITY OF4.2 ng/LSample date: 2023-10-27 to 2024-04-09
- SANFORD, CITY OF (2 WPS)3 ng/LSample date: 2023-06-07 to 2023-10-11
- CASSELBERRY, CITY OF (3 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-10 to 2024-07-15
- LONGWOOD, CITY OF (2 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANLANDO (3 WTPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
- WINTER SPRINGS, CITY OF (3 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-17 to 2025-04-09
Perfluoropentanoic acid (PFPeA)Detected in 3 systems of 7 testedNo federal or state limit; shown for transparencyHighest4.9 ng/L
- SANFORD, CITY OF (2 WPS)4.9 ng/LSample date: 2023-06-07 to 2023-10-11
- LAKE MARY, CITY OF4.1 ng/LSample date: 2023-10-27 to 2024-04-09
- WINTER SPRINGS, CITY OF (3 WPS)4 ng/LSample date: 2024-10-17 to 2025-04-09
- CASSELBERRY, CITY OF (3 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-10 to 2024-07-15
- LONGWOOD, CITY OF (2 WPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-03-27 to 2024-10-02
- OVIEDO, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-03 to 2024-08-06
- SANLANDO (3 WTPS)Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-08-06
24 substances tested, none detected in any systemShow
Tested in these 7 systems: CASSELBERRY, CITY OF (3 WPS), LAKE MARY, CITY OF, LONGWOOD, CITY OF (2 WPS), OVIEDO, CITY OF, SANFORD, CITY OF (2 WPS), SANLANDO (3 WTPS), WINTER SPRINGS, CITY OF (3 WPS)
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lithium
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 7 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in FloridaLargest water systems
- SanfordSANFORD, CITY OF (2 WPS) · FL359020579,715 served
- CasselberryCASSELBERRY, CITY OF (3 WPS) · FL359015954,747 served
- OviedoOVIEDO, CITY OF · FL359097047,933 served
- Wekiwa SpringsSANLANDO (3 WTPS) · FL359112136,953 served
- Winter SpringsWINTER SPRINGS, CITY OF (3 WPS) · FL359087934,657 served
- LongwoodLONGWOOD, CITY OF (2 WPS) · FL359020223,237 served
- Lake MaryLAKE MARY, CITY OF · FL359020117,066 served
Frequently asked
How does Seminole County tap water compare across cities?
PurityMap ranks 7 cities in Seminole County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Wekiwa Springs's main water system: SANLANDO (3 WTPS) · PWSID FL3591121 · Purity Score 98 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Seminole County cities had a PFAS sample above a 2024 EPA limit?
2 of 7 Seminole County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Winter Springs (PFOS 6.9 ng/L), Sanford (PFOS 4.7 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 4.
Is there lead in Seminole County tap water?
Utilities report lead as a 90th-percentile result from home taps. 6 of 7 Seminole County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
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