Molybdenum

California Water Service - Bear Gulch

Molybdenum is a metal that occurs naturally in soil, minerals and water. People who ingest large amounts can have increased levels of uric acid and gout-like symptoms.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	0.640 ppb	10	2	ND - 5.00 ppb
2014	ND	3	0	ND
2015	6.93 ppb	3	3	6.80 ppb - 7.20 ppb
2016	N/A	0	0	N/A
2017	4.23 ppb	6	6	2.58 ppb - 5.41 ppb
2018	3.77 ppb	2	2	3.46 ppb - 4.07 ppb
2019	2.40 ppb	2	2	0.813 ppb - 3.99 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 40 ppb

The EWG Health Guideline of 40 ppb for molybdenum was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against metabolic changes and excess formation of uric acid in the blood.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-05-07	201305080427AM	5.00 ppb
2013-05-07	201305080387AM	ND
2013-05-07	201305080417AM	1.40 ppb
2013-05-07	201305080317AM	ND
2013-08-07	201308080271AM	ND
2013-08-07	201308080182AM	ND
2013-08-07	201308080190AM	ND
2013-11-04	201311050100AM	ND
2013-11-04	201311050085AM	ND
2013-11-04	201311050070AM	ND
2014-02-03	201402040313AM	ND
2014-02-03	201402040274AM	ND
2014-02-03	201402040272AM	ND
2015-02-18	201502200422AM	6.80 ppb
2015-04-08	201504090143AM	6.80 ppb
2015-05-11	201505120355AM	7.20 ppb
2017-01-17	5701-002-1023	5.41 ppb
2017-02-08	5701-002-0939	4.91 ppb
2017-03-06	5701-002-1339	4.25 ppb
2017-05-10	5701-002-1335	3.85 ppb
2017-06-19	5701-002-1338	4.39 ppb
2017-12-06	5701-002-1335	2.58 ppb
2018-01-08	5701-002-0931	3.46 ppb
2018-02-06	5701-002-1039	4.07 ppb
2019-01-30	5701-002-1241	3.99 ppb
2019-02-19	5701-002-1311	0.813 ppb