Know Your Environment. Protect Your Health.

Arsenic

Connecticut Water Company - Northern Region-Western System

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

 

22

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND20ND
2020ND30ND
2021ND20ND
20221.08 ppb53ND - 4.00 ppb
20230.180 ppb51ND - 0.900 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic 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.

EPA Maximum Contaminant
Level (MCL): 10 ppb

The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-23BZ78887IOC1ND
2018-01-31BZ82691IOCRND
2018-03-02BZ97488IOC1ND
2018-07-12CA89150ND
2018-07-13CA89903ND
2019-01-10IOCR 200518412ND
2019-01-15IOC1 200518779ND
2020-01-09IOC1 200562368ND
2020-01-15IOCR 200563111ND
2020-09-21IOC1 200591023ND
2021-02-17IOC1 200607102ND
2021-03-05IOCR 200608709ND
2022-01-24CK222940.900 ppb
2022-01-25CK23176ND
2022-02-01CK27430ND
2022-02-01CK274340.500 ppb
2022-02-16CK693574.00 ppb
2023-01-11CN20957ND
2023-01-18CN25096ND
2023-08-23CO81672ND
2023-10-31CP38331ND
2023-12-13CP672690.900 ppb