B66/100
San Juan Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 30,000 residents · Texas
What's In San Juan's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
strontium | 1570.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2017.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
CITY OF SAN JUAN
Population Served
30,000
Water Source
Surface Water
System ID
TX1080010
Frequently Asked Questions About San Juan Water
Is San Juan tap water safe to drink?
San Juan, Texas tap water receives a grade of B (66/100), which is considered good. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in San Juan's water?
Of the 69 contaminants tested in San Juan's water supply, the most notable include strontium. No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does San Juan have any water quality violations?
Yes, San Juan has 15 EPA violation(s) on record, with the most recent in 2017. Violation types include MR, Other, MCL. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in San Juan?
San Juan water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does San Juan's tap water come from?
San Juan's drinking water is sourced from surface water and supplied by CITY OF SAN JUAN. The system serves approximately 30,000 people. Surface water sources include rivers, lakes, and reservoirs.
How often is San Juan's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. San Juan's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does San Juan's water compare to other cities in Texas?
San Juan's water quality score of 66/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Texas state page to see how all cities in the state compare.
What should I do if I'm concerned about San Juan's water quality?
If you have concerns about San Juan's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (CITY OF SAN JUAN) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.