- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 3 of 8 samples, average 16.9 µg/L, highest 58 µg/L (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- Lead, 90th percentile: 2.9 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: Surface Water Treatment Rules, Surface Water Treatment Rule, Apr 2025–May 2025 (EPA SDWIS)
- Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, Mar 2025–May 2025 (EPA SDWIS)
- Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, Feb 2025–May 2025 (EPA SDWIS)
- Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, May 2022–Jun 2024 (EPA SDWIS)
- Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, Mar 2022–Jun 2024 (EPA SDWIS)
Public EPA test results
Can you drink Signal Hill tap water? What EPA records show
EPA CA1910149 · serves Signal Hill, CA · about 11,848 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
Signal Hill - City, Water Dept. (EPA CA1910149)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Signal Hill's main utility, Signal Hill - City, Water Dept.: 5 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 Signal Hill - City, Water Dept., as of October 14, 2026
5 health-based violations since July 1, 2021 in EPA records (EPA SDWIS).
Lead, 90th percentile: 2.9 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 Signal Hill - City, Water Dept. use chloramine?
EPA treatment records (state-reported) list chloramines for Signal Hill - City, Water Dept.. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)