- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 14 of 14 samples, average 12.2 µg/L, highest 17.3 µg/L (EPA UCMR 5 testing, Oct 2024–Apr 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, 2022–Dec 31, 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: Total Coliform Rules, Revised Total Coliform Rule, Sep 2022–Sep 2022 (EPA SDWIS)
Public EPA test results
Can you drink Slidell tap water? What EPA records show
EPA LA1103041 · serves St. Tammany Parish County, LA · about 35,547 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 Slidell Water Supply (EPA LA1103041)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Slidell's main utility, City of Slidell Water Supply: 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 Slidell Water Supply, as of October 14, 2026
Health-based violation: Total Coliform Rules, Revised Total Coliform Rule, Sep 2022–Sep 2022 (EPA SDWIS).
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, 2022–Dec 31, 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 1.
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 Slidell Water Supply use chloramine?
EPA treatment records (state-reported) list chloramines for City of Slidell Water Supply. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)