- EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
- PFOS (a PFAS): found in 6 of 8 samples, average 5.5 ppt, highest 8.6 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
- HFPO-DA (a PFAS): found in 5 of 8 samples, average 5 ppt, highest 9.2 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- PFPeA (a PFAS): found in 8 of 8 samples, average 4.6 ppt, highest 6.8 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- PFHxA (a PFAS): found in 8 of 8 samples, average 4.2 ppt, highest 5.7 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- PFOA (a PFAS): found in 6 of 8 samples, average 4 ppt, highest 6.9 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- PFBS (a PFAS): found in 4 of 8 samples, average 2.2 ppt, highest 5.2 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- PFHpA (a PFAS): found in 1 of 8 samples, average 0.40 ppt, highest 3 ppt (EPA UCMR 5 testing, Dec 2024–Sep 2025)
- Lead, 90th percentile: 5 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, Chlorite, Dec 2024–Dec 2024 (EPA SDWIS)
Public EPA test results
Can you drink Columbia tap water? What EPA records show
EPA SC4010001 · serves Columbia, SC · about 354,068 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Columbia City of (Sc4010001) (EPA SC4010001)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Columbia's main utility, Columbia City of (Sc4010001): 1 health-based violation since July 1, 2021 in EPA records (EPA SDWIS). This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
What EPA records show for Columbia City of (Sc4010001), as of October 14, 2026
Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, Chlorite, Dec 2024–Dec 2024 (EPA SDWIS).
Lead, 90th percentile: 5 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Columbia City of (Sc4010001) use chloramine?
EPA treatment records (state-reported) list chloramines for Columbia City of (Sc4010001). EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)