Signal Hill, California Water Quality Report
Water quality data for 2 water systems serving 12,328 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 58.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 580% | Above guideline |
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Compliance & Violations
Active Violations (4)
71
Jul 1, 2023
52
Jun 1, 2023
51
Jul 1, 1993
Violation
Unknown
Resolved Violations (19)
41
Apr 1, 2025 — Apr 30, 2025
41
Apr 1, 2025 — Apr 30, 2025
41
Mar 1, 2025 — Mar 31, 2025
41
Mar 1, 2025 — Mar 31, 2025
41
Feb 1, 2025 — Feb 28, 2025
+ 14 more resolved violations
Frequently Asked Questions
Is Signal Hill tap water safe to drink?
Signal Hill's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Signal Hill tap water?
1 contaminants have been detected in Signal Hill's water supply across 2 water systems. See the full contaminant table above for details.
How can I improve my water quality in Signal Hill?
Install a water filter rated for the specific contaminants found in Signal Hill's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Signal Hill have any water quality violations?
Yes, Signal Hill currently has 4 active violations. See the violations section above for details.