Manganese

City of Sonoma

Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.

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	N/A	0	0	N/A
2014	ND	5	0	ND
2015	ND	1	0	ND
2016	ND	1	0	ND
2017	ND	4	0	ND
2018	6.32 ppb	13	8	ND - 31.0 ppb
2019	19.0 ppb	1	1	19.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 100 ppb

The EWG Health Guideline of 100 ppb for manganese was defined by the state of Minnesota as a health risk limit, the concentration of a contaminant that can be consumed with little or no risk to health. This health guideline protects against harm to the brain and nervous system.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-03-17	9541-006-0920	ND
2014-03-17	9541-004-0920	ND
2014-03-17	9541-003-0920	ND
2014-03-17	9541-001-1050	ND
2014-09-03	9541-023-0910	ND
2015-05-13	9541-023-0920	ND
2016-03-29	9541-002-0735	ND
2017-04-04	9541-006-1040	ND
2017-04-04	9541-004-1125	ND
2017-04-04	9541-003-1000	ND
2017-04-04	9541-001-0900	ND
2018-03-08	201803090643	ND
2018-03-08	201803090593	3.50 ppb
2018-03-08	201803090610	14.0 ppb
2018-03-08	201803090628	31.0 ppb
2018-03-08	201803090410	1.14 ppb
2018-03-08	201803090406	ND
2018-03-27	201803280743	1.70 ppb
2018-09-24	201809250208	ND
2018-09-24	201809250252	ND
2018-09-24	201809250249	24.0 ppb
2018-09-24	201809250365	4.30 ppb
2018-09-24	201809250203	2.50 ppb
2018-10-23	9541-023-0945	ND
2019-09-04	9541-002-1208	19.0 ppb