Martin County Water Quality: 2 Cities Ranked by the Records
Martin County, Florida: 2 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 1 system of 2 tested4.0 ng/L federal MCL (2024) · US EPAHighest13 ng/L
- SOUTH MARTIN REGIONAL UTILITIES13 ng/LSample date: 2024-01-23 to 2024-07-31
- STUART, CITY OF - WATER PLANTNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-10-01 to 2025-04-10
Perfluorooctanoic acid (PFOA)Detected in 1 system of 2 tested4.0 ng/L federal MCL (2024) · US EPAHighest8 ng/L
- SOUTH MARTIN REGIONAL UTILITIES8 ng/LSample date: 2024-01-23 to 2024-07-31
- STUART, CITY OF - WATER PLANTNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-10-01 to 2025-04-10
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 2 tested10 ng/L federal MCL (2024) · US EPAHighest4.4 ng/L
- SOUTH MARTIN REGIONAL UTILITIES4.4 ng/LSample date: 2024-01-23 to 2024-07-31
- STUART, CITY OF - WATER PLANTNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-01 to 2025-04-10
Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest1.2 µg/L
- STUART, CITY OF - WATER PLANT1.2 µg/LMonitoring period: 2025–2025
- SOUTH MARTIN REGIONAL UTILITIES1.1 µg/LMonitoring period: 2023–2023
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 2 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4.6 ng/L
- SOUTH MARTIN REGIONAL UTILITIES4.6 ng/LSample date: 2024-01-23 to 2024-07-31
- STUART, CITY OF - WATER PLANTNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-01 to 2025-04-10
Perfluorohexanoic acid (PFHxA)Detected in 2 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.9 ng/L
- STUART, CITY OF - WATER PLANT7.9 ng/LSample date: 2024-10-01 to 2025-04-10
- SOUTH MARTIN REGIONAL UTILITIES3.7 ng/LSample date: 2024-01-23 to 2024-07-31
Perfluoropentanoic acid (PFPeA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest12 ng/L
- STUART, CITY OF - WATER PLANT12 ng/LSample date: 2024-10-01 to 2025-04-10
- SOUTH MARTIN REGIONAL UTILITIES4.4 ng/LSample date: 2024-01-23 to 2024-07-31
24 substances tested, none detected in any systemShow
Tested in these 2 systems: SOUTH MARTIN REGIONAL UTILITIES, STUART, CITY OF - WATER PLANT
- 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
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 2 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
- Hobe SoundSOUTH MARTIN REGIONAL UTILITIES · FL443062427,000 served
- StuartSTUART, CITY OF - WATER PLANT · FL443025916,841 served
Frequently asked
How does Martin County tap water compare across cities?
PurityMap ranks 2 cities in Martin 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 Stuart's main water system: STUART, CITY OF - WATER PLANT · PWSID FL4430259 · Purity Score 99 (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 Martin County cities have PFAS above the federal limit?
1 city of 2 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Hobe Sound (PFOS 13 ng/L). PFAS were detected at any level in 2.
Is there lead in Martin County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 2 Martin 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.
Follow Martin County's water
Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.
Record changes only
We email when places in Martin County get new results. Unsubscribe any time.
Double opt-in: we email a confirmation link. Unsubscribe anytime. No spam.