San Dimas, California Water Quality Report
Water quality data for 14 water systems serving 203,277 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 87.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 870% | Above guideline |
| PFBA | 0.006 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.005 | 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 | 0.008 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.007 | 0.010 ug/L | 0.001 ug/L(EWG) | 70% | Within limit |
| PFOA | 0.013 | 0.004 ug/L | 0.090 ug/L(EWG) | 323% | Above limit |
| PFOS | 0.022 | 0.004 ug/L | 0.300 ug/L(EWG) | 550% | Above limit |
| PFPeA | 0.006 | 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 (31)
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Resolved Violations (63)
53
Jun 1, 2022 — Nov 30, 2022
53
Jun 1, 2022 — Nov 30, 2022
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Jun 1, 2022 — Nov 30, 2022
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Jun 1, 2022 — Nov 30, 2022
3A
Jun 1, 2021 — Jun 30, 2021
+ 58 more resolved violations
Frequently Asked Questions
Is San Dimas tap water safe to drink?
San Dimas'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 San Dimas tap water?
9 contaminants have been detected in San Dimas's water supply across 14 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Dimas?
Install a water filter rated for the specific contaminants found in San Dimas's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does San Dimas have any water quality violations?
Yes, San Dimas currently has 31 active violations. See the violations section above for details.