Fulton County Water Quality: 4 Cities Ranked by the Records
Fulton County, Georgia: 4 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 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.5 ng/L
- FAIRBURN4.5 ng/LSample date: 2026-01-13 to 2026-06-09
- ATLANTANot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-25 to 2024-01-10
- ROSWELLNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-11 to 2024-06-04
- UNION CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-11-20 to 2026-06-17
Total trihalomethanes (TTHM)Detected in 1 system80 ppb federal MCL · US EPAHighest70.5 ppb
- ATLANTA70.5 ppbReporting year: 2025
Haloacetic acids (HAA5)Detected in 1 system60 ppb federal MCL · US EPAHighest35.5 ppb
- ATLANTA35.5 ppbReporting year: 2025
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 4 tested10 ng/L federal MCL (2024) · US EPAHighest4.4 ng/L
- FAIRBURN4.4 ng/LSample date: 2026-01-13 to 2026-06-09
- ATLANTANot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-25 to 2024-01-10
- ROSWELLNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-11 to 2024-06-04
- UNION CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-11-20 to 2026-06-17
Lead (90th percentile)Detected in 4 systems15 µg/L federal action level · US EPAHighest4.2 µg/L
- FAIRBURN4.2 µg/LMonitoring period: 2003–2003
- UNION CITY4.2 µg/LMonitoring period: 2003–2003
- ATLANTA1.4 µg/LMonitoring period: 2022–2024
- ROSWELL1.29 µg/LMonitoring period: 2023–2025
Perfluorobutanesulfonic acid (PFBS)Detected in 4 systems2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.8 ng/L
- ROSWELL5.8 ng/LSample date: 2023-09-11 to 2024-06-04
- ATLANTA4.6 ng/LSample date: 2023-04-25 to 2024-01-10
- FAIRBURN4.1 ng/LSample date: 2026-01-13 to 2026-06-09
- UNION CITY3.4 ng/LSample date: 2025-11-20 to 2026-06-17
Perfluorohexanoic acid (PFHxA)Detected in 4 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest5.8 ng/L
- ROSWELL5.8 ng/LSample date: 2023-09-11 to 2024-06-04
- ATLANTA4.6 ng/LSample date: 2023-04-25 to 2024-01-10
- FAIRBURN4.5 ng/LSample date: 2026-01-13 to 2026-06-09
- UNION CITY3.7 ng/LSample date: 2025-11-20 to 2026-06-17
Perfluorobutanoic acid (PFBA)Detected in 1 system of 4 testedNo federal or state limit; shown for transparencyHighest8.3 ng/L
- ATLANTA8.3 ng/LSample date: 2023-04-25 to 2024-01-10
- FAIRBURNNot detected · below 5.0 ng/L lab reporting limitSample date: 2026-01-13 to 2026-06-09
- ROSWELLNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-09-11 to 2024-06-04
- UNION CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-11-20 to 2026-06-17
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 4 systemsNo federal or state limit; shown for transparencyHighest4.9 ng/L
- ROSWELL4.9 ng/LSample date: 2023-09-11 to 2024-06-04
- ATLANTA4.8 ng/LSample date: 2023-04-25 to 2024-01-10
- FAIRBURN4.6 ng/LSample date: 2026-01-13 to 2026-06-09
- UNION CITY3.5 ng/LSample date: 2025-11-20 to 2026-06-17
24 substances tested, none detected in any systemShow
Tested in these 4 systems: ATLANTA, FAIRBURN, ROSWELL, UNION CITY
- 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)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanoic acid (PFOA)
- 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 4 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 GeorgiaLargest water systems
- AtlantaATLANTA · GA12100011,089,893 served
- Union CityUNION CITY · GA121001018,636 served
- RoswellROSWELL · GA121000914,300 served
- FairburnFAIRBURN · GA121000414,000 served
Frequently asked
How does Fulton County tap water compare across cities?
PurityMap ranks 4 cities in Fulton 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 Roswell's main water system: ROSWELL · PWSID GA1210009 · 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 Fulton County cities had a PFAS sample above a 2024 EPA limit?
1 of 4 Fulton County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Fairburn (PFOS 4.5 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 Fulton County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 4 Fulton 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.
Have Fulton County water systems had drinking-water violations?
1 city in Fulton County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.
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