Los Angeles, California Water Quality Report
Water quality data for 32 water systems serving 4,034,334 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 100.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 1000% | Above guideline |
| PFBA | 0.009 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.004 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.018 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFOA | 0.005 | 0.004 ug/L | 0.090 ug/L(EWG) | 115% | Above limit |
| PFPeA | 0.022 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (10)
72
Jul 1, 2025
5A
Jan 1, 2025
75
Oct 17, 2024
75
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
52
Jun 1, 2024
52
Jun 1, 2024
Resolved Violations (490)
5A
Jun 13, 2025
5A
Jun 13, 2025
5A
Jun 13, 2025
02
Apr 1, 2025 — Jun 30, 2025
3A
Feb 1, 2025 — Feb 28, 2025
+ 485 more resolved violations
Frequently Asked Questions
Is Los Angeles tap water safe to drink?
Los Angeles's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Los Angeles tap water?
7 contaminants have been detected in Los Angeles's water supply across 32 water systems. See the full contaminant table above for details.
How can I improve my water quality in Los Angeles?
Install a water filter rated for the specific contaminants found in Los Angeles's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Los Angeles have any water quality violations?
Yes, Los Angeles currently has 108 active violations. See the violations section above for details.