- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 4 of 4 samples, average 23.5 µg/L, highest 29.8 µg/L (EPA UCMR 5 testing, Aug 2025–Dec 2025)
- Lead, 90th percentile: 1 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.
- Health-based violation: Groundwater Rule, Groundwater Rule, Apr 2025–Dec 2025 (EPA SDWIS)
- Health-based violation: Groundwater Rule, Groundwater Rule, Jun 2024–Feb 2025 (EPA SDWIS)
- Health-based violation: Groundwater Rule, Groundwater Rule, Oct 2021–Jan 2023 (EPA SDWIS)
- Health-based violation: Groundwater Rule, Groundwater Rule, Oct 2021–Oct 2021 (EPA SDWIS)
- Health-based violation: Groundwater Rule, Groundwater Rule, Oct 2021–Feb 2023 (EPA SDWIS)
- Health-based violation: Groundwater Rule, Groundwater Rule, Oct 2021–Feb 2023 (EPA SDWIS)
Public EPA test results
Can you drink Opelousas tap water? What EPA records show
EPA LA1097010 · serves St. Landry Parish County, LA · about 20,388 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 Opelousas Water System (EPA LA1097010)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Opelousas's main utility, City of Opelousas Water System: 6 health-based violations 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 Opelousas Water System, as of October 14, 2026
6 health-based violations since July 1, 2021 in EPA records (EPA SDWIS).
Lead, 90th percentile: 1 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 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 Opelousas Water System use chloramine?
We didn't find chloramine in City of Opelousas Water System's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)