Overview
Legal does not necessarily equal safe.
- Getting a passing grade from the federal government does not mean the water meets the latest health guidelines.
- Legal limits for contaminants in tap water have not been updated in almost 20 years.
- The best way to ensure clean tap water is to keep pollution out of source water in the first place.
AquaPura's analysis shows 17 contaminant(s) detected in California Water Service (CWS) - Los Altos Suburban's water exceed recommended health guidelines, though they may be within legal limits set by the EPA.
Contaminants Detected
This Utility: 1.68 ppb
Legal Limit: 10 ppb
17x
EWG's Health Guideline:
0.1 ppb
0.1 ppb
Bromodichloromethane
Potential Effect: cancer
This Utility: 8.02 ppb
No Legal Limit
134x
EWG's Health Guideline:
0.06 ppb
0.06 ppb
Chloroform
Potential Effect: cancer
This Utility: 4.91 ppb
No Legal Limit
12x
EWG's Health Guideline:
0.4 ppb
0.4 ppb
Chromium (hexavalent)*
Potential Effect: cancer
This Utility: 0.951 ppb
No Legal Limit
48x
EWG's Health Guideline:
0.02 ppb
0.02 ppb
Dibromochloromethane
Potential Effect: cancer
This Utility: 11 ppb
No Legal Limit
110x
EWG's Health Guideline:
0.1 ppb
0.1 ppb
Haloacetic acids (HAA5)
Potential Effect: cancer
This Utility: 36.2 ppb
Legal Limit: 60 ppb
362x
EWG's Health Guideline:
0.1 ppb
0.1 ppb
Haloacetic acids (HAA9)*
Potential Effect: cancer
This Utility: 18 ppb
No Legal Limit
300x
EWG's Health Guideline:
0.06 ppb
0.06 ppb
This Utility: 5.43 ppm
Legal Limit: 10 ppb
39x
EWG's Health Guideline:
0.14 ppb
0.14 ppb
This Utility: 4.13 ppm
Legal Limit: 10 ppb
30x
EWG's Health Guideline:
0.14 ppb
0.14 ppb
This Utility: 0.345 ppt
Legal Limit: 10 ppb
345x
EWG's Health Guideline:
0.001 ppb
0.001 ppb
Perfluorooctanoic acid (PFOA)
Potential Effect: cancer
This Utility: 1.38 ppt
Legal Limit: 4 ppb
15x
EWG's Health Guideline:
0.09 ppb
0.09 ppb
Total trihalomethanes (TTHMs)
Potential Effect: cancer
This Utility: 29.5 ppb
Legal Limit: 80 ppb
197x
EWG's Health Guideline:
0.15 ppb
0.15 ppb
Trichloroacetic acid
Potential Effect: cancer
This Utility: 1.72 ppb
No Legal Limit
17x
EWG's Health Guideline:
0.1 ppb
0.1 ppb
This Utility: 0.353 ppb
No Legal Limit
This Utility: 1.23 ppb
Legal Limit: 100 ppb
This Utility: 0.013 ppb
No Legal Limit
This Utility: 0.078 ppb
No Legal Limit
This Utility: 0.022 ppt
No Legal Limit
EWG's Health Guideline:
2000 ppt
2000 ppt
This Utility: 0.333 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 0.198 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 0.086 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 0.226 ppt
Legal Limit: 4 ppt
EWG's Health Guideline:
0.3 ppt
0.3 ppt
This Utility: 1.54 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
Radium, combined (-226 and -228)
Potential Effect: cancer
This Utility: 0.04 ppb
Legal Limit: 5 ppb
EWG's Health Guideline:
0.05 ppb
0.05 ppb
Find a Filter
See which water filtration technologies are effective at reducing the contaminants detected in this utility's water supply.
Carbon Filters
Filters 14 contaminants exceeding guidelines (+12 others)
Can reduce the levels of many common contaminants.
Pros
- Lower upfront cost
- Reduced maintenance
Cons
- Does not remove all contaminants
Reverse Osmosis
Filters 17 contaminants exceeding guidelines (+24 others)
Can reduce the levels of many common contaminants.
Pros
- Most effective
Cons
- Higher upfront cost
- Requires more maintenance
- Wastes water
Other Considerations
Ion Exchange
PROS: Softens hard water, Reduces some contaminants
CONS: Doesn't remove all contaminants
Whole-House Filters
PROS: Useful for reducing radiologicals and TCE
CONS: Expensive to install and maintain, Risk of bacterial contamination
Explore filter options for each contaminant. See which technologies are effective at reducing specific contaminants.
| Contaminant | Activated Carbon | Reverse Osmosis | Ion Exchange |
|---|---|---|---|
| Contaminants Above Health Guidelines | |||
| Bromate* | ✓ | ✓ | ✓ |
| Bromochloroacetic acid | ✓ | ✓ | ✕ |
| Bromodichloromethane | ✓ | ✓ | ✕ |
| Bromoform | ✓ | ✓ | ✕ |
| Chloroform | ✓ | ✓ | ✕ |
| Chromium (hexavalent)* | ✕ | ✓ | ✓ |
| Dibromoacetic acid | ✓ | ✓ | ✕ |
| Dibromochloromethane | ✓ | ✓ | ✕ |
| Dichloroacetic acid | ✓ | ✓ | ✕ |
| Haloacetic acids (HAA5) | ✓ | ✓ | ✕ |
| Haloacetic acids (HAA9)* | ✓ | ✓ | ✕ |
| Nitrate | ✕ | ✓ | ✓ |
| Nitrate and nitrite | ✕ | ✓ | ✓ |
| Perfluorohexane sulfonate (PFHXS) | ✓ | ✓ | ✕ |
| Perfluorooctanoic acid (PFOA) | ✓ | ✓ | ✕ |
| Total trihalomethanes (TTHMs) | ✓ | ✓ | ✕ |
| Trichloroacetic acid | ✓ | ✓ | ✕ |
| Other Contaminants Detected | |||
| Barium | ✕ | ✓ | ✓ |
| Bromide | ✓ | ✓ | ✕ |
| Chlorate* | ✕ | ✕ | ✕ |
| Chlorodifluoromethane | ✕ | ✕ | ✕ |
| Chromium (total) | ✕ | ✓ | ✓ |
| Cobalt | ✕ | ✓ | ✓ |
| Cyanide | ✕ | ✓ | ✓ |
| Di(2-ethylhexyl) phthalate | ✓ | ✓ | ✕ |
| Di-n-butyl phthalate | ✓ | ✓ | ✕ |
| Dichlorodifluoromethane | ✕ | ✕ | ✕ |
| Fluoride | ✕ | ✓ | ✕ |
| Lithium | ✕ | ✓ | ✓ |
| Manganese | ✕ | ✕ | ✓ |
| Mercury (inorganic) | ✓ | ✓ | ✕ |
| Molybdenum | ✕ | ✓ | ✓ |
| Monobromoacetic acid* | ✓ | ✓ | ✕ |
| Monochloroacetic acid | ✓ | ✓ | ✕ |
| N-Nitrosodimethylamine (NDMA) | ✕ | ✓ | ✕ |
| Perchlorate* | ✕ | ✓ | ✓ |
| Perfluorobutane sulfonate (PFBS) | ✓ | ✓ | ✕ |
| Perfluorobutanoic Acid (PFBA) | ✓ | ✓ | ✕ |
| Perfluoroheptanoic acid (PFHPA) | ✓ | ✓ | ✕ |
| Perfluorohexanoic Acid (PFHxA) | ✓ | ✓ | ✕ |
| Perfluorooctane sulfonate (PFOS) | ✓ | ✓ | ✕ |
| Perfluoropentanoic Acid (PFPeA) | ✓ | ✓ | ✕ |
| Radium, combined (-226 and -228) | ✕ | ✓ | ✓ |
| Selenium | ✕ | ✓ | ✕ |
| Strontium* | ✕ | ✓ | ✓ |
| Vanadium* | ✕ | ✕ | ✓ |
Protect your family's health.
Don't wait for your utility to improve. Get a free water analysis from AquaPura and find the right filtration system for your home.