Water Utility

Coastside County Water District

Location San Mateo County, California,
CA
Serves 18,789
Source Surface water
PWS ID CA4110011

Overview

Contaminants Detected

Arsenic

Potential Effect: Over Legal Limit
This Utility: 0.306 ppb Legal Limit: 10 ppb
77x
EWG's Health Guideline:
0.004 ppb

Bromodichloromethane

Potential Effect: cancer
This Utility: 14.4 ppb No Legal Limit
240x
EWG's Health Guideline:
0.06 ppb
This Utility: 3.12 ppb No Legal Limit
6.2x
EWG's Health Guideline:
0.5 ppb

Chloroform

Potential Effect: cancer
This Utility: 16.1 ppb No Legal Limit
40x
EWG's Health Guideline:
0.4 ppb

Chromium (hexavalent)*

Potential Effect: cancer
This Utility: 0.131 ppb No Legal Limit
6.5x
EWG's Health Guideline:
0.02 ppb
This Utility: 4.45 ppb No Legal Limit
148x
EWG's Health Guideline:
0.03 ppb

Dibromochloromethane

Potential Effect: cancer
This Utility: 13.4 ppb No Legal Limit
134x
EWG's Health Guideline:
0.1 ppb
This Utility: 10.1 ppb No Legal Limit
51x
EWG's Health Guideline:
0.2 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: 33 ppb No Legal Limit
550x
EWG's Health Guideline:
0.06 ppb

Nitrate

Potential Effect: cancer
This Utility: 0.55 ppm Legal Limit: 10 ppb
3.9x
EWG's Health Guideline:
0.14 ppb
This Utility: 0.319 ppm Legal Limit: 10 ppb
2.3x
EWG's Health Guideline:
0.14 ppb

Total trihalomethanes (TTHMs)

Potential Effect: cancer
This Utility: 47 ppb Legal Limit: 80 ppb
313x
EWG's Health Guideline:
0.15 ppb

Trichloroacetic acid

Potential Effect: cancer
This Utility: 8.45 ppb No Legal Limit
84x
EWG's Health Guideline:
0.1 ppb
This Utility: 66 ppb No Legal Limit
EWG's Health Guideline:
600 ppb
This Utility: 0.0625 ppb Legal Limit: 6 ppb
EWG's Health Guideline:
1 ppb
This Utility: 20.4 ppb Legal Limit: 2000 ppb
EWG's Health Guideline:
700 ppb
This Utility: 98.4 ppb No Legal Limit
This Utility: 326.9 ppb No Legal Limit
EWG's Health Guideline:
210 ppb
This Utility: 0.521 ppb Legal Limit: 100 ppb
This Utility: 0.25 ppb Legal Limit: 200 ppb
This Utility: 0.195 ppm Legal Limit: 4 ppm
This Utility: 32.5 ppb No Legal Limit
EWG's Health Guideline:
100 ppb
This Utility: 0.638 ppb No Legal Limit
EWG's Health Guideline:
40 ppb
This Utility: 0.205 ppb No Legal Limit
EWG's Health Guideline:
25 ppb
This Utility: 1.41 ppb No Legal Limit
EWG's Health Guideline:
53 ppb
This Utility: 0.681 ppb Legal Limit: 50 ppb
EWG's Health Guideline:
30 ppb
This Utility: 0.503 ppb No Legal Limit
This Utility: 0.0528 ppb No Legal Limit
EWG's Health Guideline:
1500 ppb
This Utility: 0.119 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 10 contaminants exceeding guidelines (+3 others)

Can reduce the levels of many common contaminants.

Pros
  • Lower upfront cost
  • Reduced maintenance
Cons
  • Does not remove all contaminants
Reverse Osmosis
Filters 14 contaminants exceeding guidelines (+13 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
Chloroform
Chromium (hexavalent)*
Dibromoacetic acid
Dibromochloromethane
Dichloroacetic acid
Haloacetic acids (HAA5)
Haloacetic acids (HAA9)*
Nitrate
Nitrate and nitrite
Total trihalomethanes (TTHMs)
Trichloroacetic acid
Other Contaminants Detected
Aluminum
Antimony
Barium
Bromide
Chlorate*
Chromium (total)
Cyanide
Fluoride
Manganese
Molybdenum
Monobromoacetic acid*
Monochloroacetic acid
Selenium
Silver
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.