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EWG's Tap Water Database — 2021 UPDATE

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Bassi Ranch Mutual Water Company

EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the California State Water Resources Control Board, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2021 - March 2021), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

Utility Details

  • San Luis Obispo County, California
  • Serves: 85
  • Data available: 2014-2019
  • Source: Groundwater

Contaminants Detected

1

EXCEED
EWG HEALTH
GUIDELINES

7 Total Contaminants

  • 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.

What To Do

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Contaminants Detected

VIEW: EXCEED GUIDELINES OTHER DETECTED

Bromate

Potential Effect: cancer53x EWG'S HEALTH GUIDELINE
THIS UTILITY5.29 ppb
EWG HEALTH GUIDELINE0.1 ppb
LEGAL LIMIT10 ppb
DETAILS
X

Bromate

more about
this contaminant

Bromate is a carcinogenic disinfection byproduct formed when source waters containing bromide are treated with ozonation or sodium hypochlorite. Studies of laboratory animals show that bromate damages DNA and causes cancer in multiple organs. Click here to read more about disinfection byproducts.

Bromate was found at 53 times above EWG's Health Guideline.

EWG Health Guideline

0.1 ppb or less

This Utility

5.29 ppb

Legal Limit

10 ppb

National Average

0.693 ppb

State Average

0.582 ppb
The state and national averages were calculated using the averages of the contaminant measurements for each utility in 2017-2019.
ppb = parts per billion

Health Risks

The EWG Health Guideline of 0.1 ppb for bromate was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

VIEW MORE TESTING DATA

Pollution Sources

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Treatment Byproducts

Filtering Options

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

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Ion Exchange

Includes chemicals detected in 2017-2019 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority.

Other Contaminants Tested

✕

Chemicals tested for but not detected from 2014 to 2019:

1,1,1,2-Tetrachloroethane , 1,1,1-Trichloroethane , 1,1,2,2-Tetrachloroethane , 1,1,2-Trichloroethane , 1,1-Dichloroethane , 1,1-Dichloroethylene , 1,1-Dichloropropene , 1,2,3-Trichlorobenzene , 1,2,3-Trichloropropane , 1,2,4-Trichlorobenzene , 1,2,4-Trimethylbenzene , 1,2-Dichloroethane , 1,2-Dichloropropane , 1,3,5-Trimethylbenzene , 1,3-Dichloropropane , 1,3-Dichloropropene , 2,2-Dichloropropane , Acetone , Alachlor (Lasso) , Antimony , Arsenic , Atrazine , Benzene , Beryllium , Bromobenzene , Bromochloromethane , Bromodichloromethane , Bromoform , Bromomethane , Cadmium , Carbon tetrachloride , Chloroethane , Chloroform , Chloromethane , Chromium (hexavalent) , Chromium (total) , cis-1,2-Dichloroethylene , cis-1,3-Dichloropropene , Cyanide , Dibromochloromethane , Dibromomethane , Dichlorodifluoromethane , Dichloromethane (methylene chloride) , Ethyl tert-butyl ether , Ethylbenzene , Hexachlorobutadiene , Isopropyl ether , Isopropylbenzene , m-Dichlorobenzene , Manganese , Mercury (inorganic) , Methyl ethyl ketone , Methyl isobutyl ketone , Monochlorobenzene (chlorobenzene) , MTBE , n-Butylbenzene , n-Propylbenzene , Naphthalene , Nitrite , o-Chlorotoluene , o-Dichlorobenzene , p-Chlorotoluene , p-Dichlorobenzene , p-Isopropyltoluene , Perchlorate , sec-Butylbenzene , Silver , Simazine , Styrene , tert-Amyl methyl ether , tert-Butyl alcohol , tert-Butylbenzene , Tetrachloroethylene (perchloroethylene) , Thallium , Toluene , Total trihalomethanes (TTHMs) , trans-1,2-Dichloroethylene , trans-1,3-Dichloropropene , Trichloroethylene , Trichlorofluoromethane , Trichlorotrifluoroethane , Vanadium , Vinyl chloride , Xylenes (total)

Bassi Ranch Mutual Water Company compliance with legally mandated federal standards:

  • From April 2019 to March 2021, Bassi Ranch Mutual Water Company complied with health-based drinking water standards.
  • 11 QUARTERS
    in violation of any federal drinking water standard from April 2019 to March 2021

Information in this section on Bassi Ranch Mutual Water Company comes from the U.S. EPA Enforcement and Compliance History Online database (ECHO).

LEARN MORE ABOUT THIS UTILITY

Water Filters That Can Reduce Contaminant Levels

ContaminantActivated Carbonactivated carbonReverse Osmosisreverse osmosisIon Exchangeion exchange
CONTAMINANTS ABOVE
HEALTH GUIDELINES
Bromate✔✔✔
OTHER CONTAMINANTS
DETECTED
Aluminum✔
Barium✔✔
Fluoride✔
Nitrate✔✔
Nitrate & nitrite✔✔
Selenium✔

Take Action

Contact Your Local Official

One of the best ways to push for cleaner water is to hold accountable the elected officials who have a say in water quality – from city hall and the state legislature to Congress all the way to the Oval Office – by asking questions and demanding answers.

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Filter Out Contaminants

Check out our recommendations for filters to protect your water against the detected contaminants.

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