Riverside, California Water Quality Report
Water quality data for 10 water systems serving 402,629 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 37.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 370% | Above guideline |
| PFBS | 0.003 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.004 | 0.010 ug/L | 0.001 ug/L(EWG) | 41% | Within limit |
| PFOA | 0.005 | 0.004 ug/L | 0.090 ug/L(EWG) | 138% | Above limit |
| PFOS | 0.006 | 0.004 ug/L | 0.300 ug/L(EWG) | 143% | Above limit |
| PFPeA | 0.007 | 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 (4)
34
May 12, 2025
34
May 12, 2025
Violation
Unknown
Violation
Unknown
Resolved Violations (156)
02
Apr 1, 2025 — Jun 30, 2025
02
Apr 1, 2025 — Jun 30, 2025
1A
Apr 1, 2025 — Apr 30, 2025
1A
Apr 1, 2025 — Apr 30, 2025
1A
Apr 1, 2025 — Apr 30, 2025
+ 151 more resolved violations
Frequently Asked Questions
Is Riverside tap water safe to drink?
Riverside's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Riverside tap water?
7 contaminants have been detected in Riverside's water supply across 10 water systems. See the full contaminant table above for details.
How can I improve my water quality in Riverside?
Install a water filter rated for the specific contaminants found in Riverside's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Riverside have any water quality violations?
Yes, Riverside currently has 4 active violations. See the violations section above for details.