- EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
- Lithium: found in 8 of 8 samples, average 42.6 µg/L, highest 49.8 µg/L (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFBA (a PFAS): found in 8 of 8 samples, average 6.7 ppt, highest 8.2 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFPeA (a PFAS): found in 8 of 8 samples, average 5.7 ppt, highest 9.2 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFHxA (a PFAS): found in 8 of 8 samples, average 5.4 ppt, highest 9 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFOS (a PFAS): found in 1 of 8 samples, average 0.60 ppt, highest 4.5 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFHxS (a PFAS): found in 1 of 8 samples, average 0.50 ppt, highest 3.9 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- PFHpA (a PFAS): found in 1 of 8 samples, average 0.40 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Nov 2024–Aug 2025)
- Lead, 90th percentile: 0 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–Dec 31, 2026). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink San Juan tap water? What EPA records show
EPA TX1080010 · serves Hidalgo County, TX · about 30,000 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 San Juan (EPA TX1080010)
EPA data as of October 14, 2026. For San Juan's main utility, City of San Juan: We found no health-based violations in EPA's records for this system (TX1080010) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 7. This is public data, not a test of your tap.
What EPA records show for City of San Juan, as of October 14, 2026
We found no health-based violations in EPA's records for this system (TX1080010) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for City of San Juan (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 0 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–Dec 31, 2026). 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 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 City of San Juan use chloramine?
We didn't find chloramine in City of San Juan's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.