Water Utility

Great Oaks Water Company Inc.

Location Santa Clara County, California,
CA
Serves 108,902
Source Groundwater
PWS ID CA4310022

Overview

Contaminants Detected

Arsenic

Potential Effect: Over Legal Limit
↗
This Utility: 0.225 ppb Legal Limit: 10 ppb
56x
EWG's Health Guideline:
0.004 ppb

Bromodichloromethane

Potential Effect: cancer
↗
This Utility: 0.2 ppb No Legal Limit
3.3x
EWG's Health Guideline:
0.06 ppb
This Utility: 5.41 ppb No Legal Limit
11x
EWG's Health Guideline:
0.5 ppb

Chromium (hexavalent)*

Potential Effect: cancer
↗
This Utility: 3.77 ppb No Legal Limit
189x
EWG's Health Guideline:
0.02 ppb
This Utility: 1.59 ppb No Legal Limit
53x
EWG's Health Guideline:
0.03 ppb

Dibromochloromethane

Potential Effect: cancer
↗
This Utility: 1.07 ppb No Legal Limit
11x
EWG's Health Guideline:
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

Haloacetic acids (HAA9)*

Potential Effect: cancer
↗
This Utility: 3.02 ppb No Legal Limit
50x
EWG's Health Guideline:
0.06 ppb

Nitrate

Potential Effect: cancer
↗
This Utility: 1.7 ppm Legal Limit: 10 ppb
12x
EWG's Health Guideline:
0.14 ppb
This Utility: 1.56 ppm Legal Limit: 10 ppb
11x
EWG's Health Guideline:
0.14 ppb

Total trihalomethanes (TTHMs)

Potential Effect: cancer
↗
This Utility: 7.65 ppb Legal Limit: 80 ppb
51x
EWG's Health Guideline:
0.15 ppb
This Utility: 0.104 ppb Legal Limit: 200 ppb
This Utility: 84 ppb Legal Limit: 2000 ppb
EWG's Health Guideline:
700 ppb
This Utility: 9.96 ppb No Legal Limit
EWG's Health Guideline:
210 ppb
This Utility: 0.178 ppb No Legal Limit

Chloroform

Potential Effect: cancer
↗
This Utility: 0.762 ppb No Legal Limit
EWG's Health Guideline:
0.4 ppb
This Utility: 0.6 ppb Legal Limit: 100 ppb
This Utility: 0.155 ppm Legal Limit: 4 ppm
This Utility: 0.184 ppb No Legal Limit
EWG's Health Guideline:
100 ppb
This Utility: 0.0393 ppb No Legal Limit
EWG's Health Guideline:
40 ppb
This Utility: 0.571 ppb No Legal Limit
EWG's Health Guideline:
1500 ppb
This Utility: 0.107 ppb No Legal Limit
EWG's Health Guideline:
4000 ppb
This Utility: 1.65 ppb No Legal Limit
EWG's Health Guideline:
21 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 7 contaminants exceeding guidelines (+2 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 (+7 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
Arsenic ✕ ✓ ✓
Bromodichloromethane ✓ ✓ ✕
Bromoform ✓ ✓ ✕
Chromium (hexavalent)* ✕ ✓ ✓
Dibromoacetic acid ✓ ✓ ✕
Dibromochloromethane ✓ ✓ ✕
Haloacetic acids (HAA5) ✓ ✓ ✕
Haloacetic acids (HAA9)* ✓ ✓ ✕
Nitrate ✕ ✓ ✓
Nitrate and nitrite ✕ ✓ ✓
Total trihalomethanes (TTHMs) ✓ ✓ ✕
Other Contaminants Detected
1,1,1-Trichloroethane ✓ ✓ ✕
Barium ✕ ✓ ✓
Chlorate* ✕ ✕ ✕
Chlorodifluoromethane ✕ ✕ ✕
Chloroform ✓ ✓ ✕
Chromium (total) ✕ ✓ ✓
Fluoride ✕ ✓ ✕
Manganese ✕ ✕ ✓
Molybdenum ✕ ✓ ✓
Strontium* ✕ ✓ ✓
Trichlorotrifluoroethane ✕ ✕ ✕
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.