Arsenic

Columbia Crest Estates

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.

MORE ABOUT THIS CONTAMINANT

116

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	19.1 ppb	8	8	8.00 ppb - 35.0 ppb
2015	10.3 ppb	12	7	ND - 46.0 ppb
2016	1.79 ppb	24	11	ND - 7.00 ppb
2017	2.58 ppb	24	12	ND - 9.00 ppb
2018	3.98 ppb	24	16	ND - 18.0 ppb
2019	2.04 ppb	24	17	ND - 4.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-03-17	51616	29.0 ppb
2014-03-17	51617	8.00 ppb
2014-06-18	52663	35.0 ppb
2014-06-18	52664	13.0 ppb
2014-09-17	54136	11.0 ppb
2014-09-17	54137	27.0 ppb
2014-12-17	55172	11.0 ppb
2014-12-17	55173	19.0 ppb
2015-04-01	56240	12.0 ppb
2015-04-01	56239	20.0 ppb
2015-06-15	57389	12.0 ppb
2015-06-15	57388	46.0 ppb
2015-10-14	59014	12.0 ppb
2015-10-14	59013	ND
2015-10-14	59016	20.0 ppb
2015-10-14	59015	ND
2015-11-11	59304	ND
2015-11-11	59372	ND
2015-12-14	59575	1.000 ppb
2015-12-14	59579	ND
2016-01-12		3.00 ppb
2016-01-12		ND
2016-02-17		ND
2016-02-17		2.00 ppb
2016-03-16		2.00 ppb
2016-03-16		ND
2016-04-18		ND
2016-04-18		ND
2016-05-18		1.000 ppb
2016-05-18		5.00 ppb
2016-06-20		7.00 ppb
2016-06-20		ND
2016-07-18		5.00 ppb
2016-07-18		ND
2016-08-17		ND
2016-08-17		4.00 ppb
2016-09-14		ND
2016-09-14		ND
2016-10-17		ND
2016-10-17		5.00 ppb
2016-11-15		ND
2016-11-15		5.00 ppb
2016-12-14		ND
2016-12-14		4.00 ppb
2017-01-18		ND
2017-01-18		3.00 ppb
2017-02-21		3.00 ppb
2017-02-21		ND
2017-03-20		ND
2017-03-20		4.00 ppb
2017-04-19		ND
2017-04-19		2.00 ppb
2017-05-17		ND
2017-05-17		4.00 ppb
2017-06-14		ND
2017-06-14		9.00 ppb
2017-07-17		3.00 ppb
2017-07-17		ND
2017-08-15		7.00 ppb
2017-08-15		ND
2017-09-13		ND
2017-09-13		7.00 ppb
2017-10-18		ND
2017-10-18		7.00 ppb
2017-11-15		7.00 ppb
2017-11-15		ND
2017-12-13		ND
2017-12-13		6.00 ppb
2018-01-17		ND
2018-01-17		4.00 ppb
2018-02-17		ND
2018-02-19		5.00 ppb
2018-03-14		ND
2018-03-14		6.00 ppb
2018-04-16		ND
2018-04-16		7.00 ppb
2018-05-16		ND
2018-05-16		5.70 ppb
2018-06-13		ND
2018-06-13		10.9 ppb
2018-07-18		ND
2018-07-18		7.70 ppb
2018-08-22		1.60 ppb
2018-08-22		5.70 ppb
2018-09-12		1.70 ppb
2018-09-12		9.40 ppb
2018-10-17		1.40 ppb
2018-10-17		8.70 ppb
2018-11-19		1.60 ppb
2018-11-28		18.0 ppb
2018-12-19		1.20 ppb
2018-12-19		ND
2019-01-16		1.20 ppb
2019-01-16		ND
2019-02-20		1.60 ppb
2019-02-20		ND
2019-03-20		1.90 ppb
2019-03-20		ND
2019-04-17		1.80 ppb
2019-04-17		ND
2019-05-15		2.20 ppb
2019-05-15		ND
2019-06-19		4.20 ppb
2019-06-19		1.70 ppb
2019-07-17		2.70 ppb
2019-07-17		ND
2019-08-12		4.20 ppb
2019-08-12		ND
2019-09-16		3.70 ppb
2019-09-16		1.80 ppb
2019-10-16		4.80 ppb
2019-10-16		2.70 ppb
2019-11-13		4.50 ppb
2019-11-13		3.10 ppb
2019-12-18		3.50 ppb
2019-12-18		3.40 ppb