Know Your Environment. Protect Your Health.

Arsenic

Littleton Water Department

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.

 

63

Samples

1

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.33 ppb93ND - 7.00 ppb
20191.000 ppb63ND - 4.00 ppb
20201.58 ppb122ND - 17.0 ppb
20211.000 ppb103ND - 7.00 ppb
20221.000 ppb72ND - 6.00 ppb
20230.968 ppb198ND - 8.10 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 Result
2018-03-21ND
2018-05-01ND
2018-05-01ND
2018-05-01ND
2018-05-07ND
2018-06-19ND
2018-06-197.00 ppb
2018-09-183.00 ppb
2018-10-162.00 ppb
2019-01-08ND
2019-03-26ND
2019-06-051.000 ppb
2019-06-054.00 ppb
2019-08-06ND
2019-08-061.000 ppb
2020-05-14ND
2020-05-14ND
2020-05-26ND
2020-05-26ND
2020-05-26ND
2020-05-26ND
2020-06-1617.0 ppb
2020-06-16ND
2020-09-16ND
2020-11-04ND
2020-12-30ND
2020-12-302.00 ppb
2021-01-12ND
2021-01-122.00 ppb
2021-04-05ND
2021-04-05ND
2021-04-057.00 ppb
2021-06-15ND
2021-07-27ND
2021-07-271.000 ppb
2021-10-14ND
2021-10-14ND
2022-02-16ND
2022-02-16ND
2022-05-18ND
2022-05-18ND
2022-05-186.00 ppb
2022-11-071.000 ppb
2022-11-07ND
2023-01-17ND
2023-01-17ND
2023-06-161.40 ppb
2023-06-16ND
2023-06-16ND
2023-06-161.60 ppb
2023-06-16ND
2023-06-16ND
2023-06-168.10 ppb
2023-06-161.30 ppb
2023-06-16ND
2023-09-191.60 ppb
2023-09-19ND
2023-09-19ND
2023-10-031.80 ppb
2023-10-031.000 ppb
2023-12-28ND
2023-12-28ND
2023-12-281.60 ppb