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 11 contaminant(s) detected in Oak Bluffs Water District's water exceed recommended health guidelines, though they may be within legal limits set by the EPA.
Contaminants Detected
Chloroform
Potential Effect: cancer
This Utility: 1.2 ppb
No Legal Limit
3x
EWG's Health Guideline:
0.4 ppb
0.4 ppb
Chromium (hexavalent)*
Potential Effect: cancer
This Utility: 0.311 ppb
No Legal Limit
16x
EWG's Health Guideline:
0.02 ppb
0.02 ppb
Haloacetic acids (HAA9)*
Potential Effect: cancer
This Utility: 0.813 ppb
No Legal Limit
14x
EWG's Health Guideline:
0.06 ppb
0.06 ppb
This Utility: 0.561 ppm
Legal Limit: 10 ppb
4x
EWG's Health Guideline:
0.14 ppb
0.14 ppb
This Utility: 0.51 ppt
Legal Limit: 10 ppb
510x
EWG's Health Guideline:
0.001 ppb
0.001 ppb
Perfluorooctanoic acid (PFOA)
Potential Effect: cancer
This Utility: 0.847 ppt
Legal Limit: 4 ppb
9.4x
EWG's Health Guideline:
0.09 ppb
0.09 ppb
Radium, combined (-226 and -228)
Potential Effect: cancer
This Utility: 0.28 ppb
Legal Limit: 5 ppb
5.6x
EWG's Health Guideline:
0.05 ppb
0.05 ppb
Tetrachloroethylene (perchloroethylene)
Potential Effect: cancer
This Utility: 0.264 ppb
Legal Limit: 5 ppb
4.4x
EWG's Health Guideline:
0.06 ppb
0.06 ppb
Total trihalomethanes (TTHMs)
Potential Effect: cancer
This Utility: 2.4 ppb
Legal Limit: 80 ppb
16x
EWG's Health Guideline:
0.15 ppb
0.15 ppb
Trichloroacetic acid
Potential Effect: cancer
This Utility: 0.61 ppb
No Legal Limit
6.1x
EWG's Health Guideline:
0.1 ppb
0.1 ppb
Bromodichloromethane
Potential Effect: cancer
This Utility: 0.06 ppb
No Legal Limit
EWG's Health Guideline:
0.06 ppb
0.06 ppb
This Utility: 0.0475 ppb
No Legal Limit
Dibromochloromethane
Potential Effect: cancer
This Utility: 0.0923 ppb
No Legal Limit
EWG's Health Guideline:
0.1 ppb
0.1 ppb
This Utility: 0.223 ppt
No Legal Limit
EWG's Health Guideline:
2000 ppt
2000 ppt
This Utility: 0.578 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 1.34 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 0.509 ppt
Legal Limit: 4 ppt
EWG's Health Guideline:
0.3 ppt
0.3 ppt
This Utility: 0.7 ppt
No Legal Limit
EWG's Health Guideline:
1000 ppt
1000 ppt
This Utility: 0.0714 ppb
Legal Limit: 70 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 8 contaminants exceeding guidelines (+11 others)
Can reduce the levels of many common contaminants.
Pros
- Lower upfront cost
- Reduced maintenance
Cons
- Does not remove all contaminants
Reverse Osmosis
Filters 11 contaminants exceeding guidelines (+17 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 | |||
| Chloroform | ✓ | ✓ | ✕ |
| Chromium (hexavalent)* | ✕ | ✓ | ✓ |
| Dibromoacetic acid | ✓ | ✓ | ✕ |
| Haloacetic acids (HAA9)* | ✓ | ✓ | ✕ |
| Nitrate | ✕ | ✓ | ✓ |
| Perfluorohexane sulfonate (PFHXS) | ✓ | ✓ | ✕ |
| Perfluorooctanoic acid (PFOA) | ✓ | ✓ | ✕ |
| Radium, combined (-226 and -228) | ✕ | ✓ | ✓ |
| Tetrachloroethylene (perchloroethylene) | ✓ | ✓ | ✕ |
| Total trihalomethanes (TTHMs) | ✓ | ✓ | ✕ |
| Trichloroacetic acid | ✓ | ✓ | ✕ |
| Other Contaminants Detected | |||
| 1,1-Dichloroethane | ✓ | ✓ | ✕ |
| 1,4-Dioxane | ✕ | ✓ | ✕ |
| Aluminum | ✕ | ✓ | ✕ |
| Barium | ✕ | ✓ | ✓ |
| Bromodichloromethane | ✓ | ✓ | ✕ |
| Bromoform | ✓ | ✓ | ✕ |
| Chlorate* | ✕ | ✕ | ✕ |
| Chlorodifluoromethane | ✕ | ✕ | ✕ |
| Dibromochloromethane | ✓ | ✓ | ✕ |
| Dichloroacetic acid | ✓ | ✓ | ✕ |
| Fluoride | ✕ | ✓ | ✕ |
| Manganese | ✕ | ✕ | ✓ |
| Perchlorate* | ✕ | ✓ | ✓ |
| Perfluorobutane sulfonate (PFBS) | ✓ | ✓ | ✕ |
| Perfluoroheptanoic acid (PFHPA) | ✓ | ✓ | ✕ |
| Perfluorohexanoic Acid (PFHxA) | ✓ | ✓ | ✕ |
| Perfluorooctane sulfonate (PFOS) | ✓ | ✓ | ✕ |
| Perfluoropentanoic Acid (PFPeA) | ✓ | ✓ | ✕ |
| Strontium* | ✕ | ✓ | ✓ |
| Vanadium* | ✕ | ✕ | ✓ |
| cis-1,2-Dichloroethylene | ✓ | ✓ | ✕ |
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.