- EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
- Lithium: found in 69 of 96 samples, average 12.4 µg/L, highest 33.9 µg/L (EPA UCMR 5 testing, Feb 2023–Feb 2025)
- 6:2 FTS (a PFAS): found in 10 of 96 samples, average 1.7 ppt, highest 42.6 ppt (EPA UCMR 5 testing, Feb 2023–Feb 2025)
- PFBA (a PFAS): found in 9 of 96 samples, average 0.70 ppt, highest 10.6 ppt (EPA UCMR 5 testing, Feb 2023–Feb 2025)
- PFHxA (a PFAS): found in 16 of 96 samples, average 0.60 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Feb 2023–Feb 2025)
- PFPeA (a PFAS): found in 11 of 96 samples, average 0.50 ppt, highest 6.7 ppt (EPA UCMR 5 testing, Feb 2023–Feb 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, 2024–Jun 30, 2024). 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: Surface Water Treatment Rules, Interim Enhanced Surface Water Treatment Rule, May 2025–Jul 2025 (EPA SDWIS)
Public EPA test results
Can you drink Houston tap water? What EPA records show
EPA TX1010013 · serves Harris County, TX · about 2,970,543 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
City of Houston (EPA TX1010013)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Houston's main utility, City of Houston: 1 health-based violation since July 1, 2021 in EPA records (EPA SDWIS). PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for City of Houston, as of October 14, 2026
Health-based violation: Surface Water Treatment Rules, Interim Enhanced Surface Water Treatment Rule, May 2025–Jul 2025 (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, 2024–Jun 30, 2024). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
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 City of Houston use chloramine?
EPA treatment records (state-reported) list chloramines for City of Houston. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)