Updated 2026-09-16

County water report

Union County Water Quality

Name: Union County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Union County, South Carolina: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map

Across the county's systems

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)UNION CITY OF (SC4410001)4.0 ng/L federal MCL (2024) · US EPA6.1 ng/L

UNION CITY OF (SC4410001)6.1 ng/LSample date: 2023-10-10 to 2024-07-18

Perfluorooctanoic acid (PFOA)UNION CITY OF (SC4410001)4.0 ng/L federal MCL (2024) · US EPA5.9 ng/L

UNION CITY OF (SC4410001)5.9 ng/LSample date: 2023-10-10 to 2024-07-18

Perfluorobutanesulfonic acid (PFBS)UNION CITY OF (SC4410001)2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA3 ng/L

UNION CITY OF (SC4410001)3 ng/LSample date: 2023-10-10 to 2024-07-18

Perfluorohexanoic acid (PFHxA)UNION CITY OF (SC4410001)400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE8.2 ng/L

UNION CITY OF (SC4410001)8.2 ng/LSample date: 2023-10-10 to 2024-07-18

Perfluoroheptanoic acid (PFHpA)UNION CITY OF (SC4410001)No federal or state limit; shown for transparency3.6 ng/L

UNION CITY OF (SC4410001)3.6 ng/LSample date: 2023-10-10 to 2024-07-18

Perfluoropentanoic acid (PFPeA)UNION CITY OF (SC4410001)No federal or state limit; shown for transparency11.9 ng/L

UNION CITY OF (SC4410001)11.9 ng/LSample date: 2023-10-10 to 2024-07-18

25 substances tested, none detected in this systemShow

Tested in this system: UNION CITY OF (SC4410001)

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)
Lead (90th percentile)
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)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorononanoic acid (PFNA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

1 city

Cities ranked by the records

1
UnionUNION CITY OF (SC4410001)
PFAS above limit
Open city report →

Showing 1 of 1 cities · scores are system-level, not tap tests

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.

PFAS in Union County1 of 1 city reports a regulated PFAS above the federal limit

Union6.1 ng/L

4.0 ng/L federal MCL · PFOS, ng/LPFAS in South Carolina

Lead

0of 1 city 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 South Carolina

Who supplies the county

Largest water systems

UnionUNION CITY OF (SC4410001) · SC4410001
13,076 served

Questions

Frequently asked

How does Union County tap water compare across cities?

PurityMap ranks 1 city in Union 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 Union's main water system: UNION CITY OF (SC4410001) · PWSID SC4410001 · Purity Score 67 (Fair) · 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 Union County cities have PFAS above the federal limit?

1 city of 1 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Union (PFOS 6.1 ng/L). PFAS were detected at any level in 1.

Is there lead in Union County tap water?

Utilities report lead as a 90th-percentile result from home taps. 0 of 1 Union 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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