Manganese

City of Merced

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

100

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	1.50 ppb	20	1	ND - 30.0 ppb
2015	N/A	0	0	N/A
2016	7.40 ppb	20	2	ND - 83.0 ppb
2017	ND	1	0	ND
2018	0.163 ppb	39	5	ND - 3.60 ppb
2019	ND	20	0	ND

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
2014-01-09	5810-008-0832	ND
2014-01-09	5810-019-1109	ND
2014-01-09	5810-020-0937	30.0 ppb
2014-01-09	5810-016-1350	ND
2014-01-09	5810-015-1430	ND
2014-01-09	5810-022-1250	ND
2014-01-09	5810-023-0900	ND
2014-01-09	5810-011-1445	ND
2014-01-09	5810-041-0955	ND
2014-01-09	5810-042-1053	ND
2014-01-09	5810-043-1031	ND
2014-01-09	5810-048-1409	ND
2014-01-09	5810-005-0857	ND
2014-01-09	5810-049-1140	ND
2014-01-09	5810-054-1318	ND
2014-01-09	5810-004-0854	ND
2014-01-10	5810-021-0858	ND
2014-01-10	5810-001-0944	ND
2014-01-10	5810-002-0950	ND
2014-01-10	5810-003-0941	ND
2016-05-10	1233-057-1600	83.0 ppb
2016-09-01	9590-049-0945	ND
2016-09-01	9590-021-1450	ND
2016-09-01	9590-048-0910	ND
2016-09-01	9590-054-0846	ND
2016-09-01	9590-043-1235	ND
2016-09-01	9590-041-1020	65.0 ppb
2016-09-01	9590-023-1430	ND
2016-09-01	9590-022-1335	ND
2016-09-01	9590-020-1120	ND
2016-09-01	9590-019-1055	ND
2016-09-01	9590-016-1030	ND
2016-09-01	9590-015-0810	ND
2016-09-01	9590-011-0901	ND
2016-09-01	9590-005-1340	ND
2016-09-01	9590-004-1240	ND
2016-09-01	9590-003-1255	ND
2016-09-01	9590-002-1400	ND
2016-09-01	9590-001-1205	ND
2016-12-01	9590-042-0854	ND
2017-03-09	9590-008-0840	ND
2018-05-14	A8D2533-03	ND
2018-05-14	A8D2533-01	ND
2018-05-14	A8D2533-07	ND
2018-05-14	A8D2533-18	ND
2018-05-14	A8D2533-17	ND
2018-05-14	A8D2533-16	ND
2018-05-14	A8D2533-15	ND
2018-05-14	A8D2533-14	ND
2018-05-14	A8D2533-10	ND
2018-05-14	A8D2533-09	ND
2018-05-15	A8D2533-08	ND
2018-05-15	A8D2533-06	ND
2018-05-15	A8D2533-19	ND
2018-05-15	A8D2533-20	ND
2018-05-15	A8D2533-02	ND
2018-05-23	A8D2533-05	ND
2018-06-21	A8D2533-12	ND
2018-06-21	A8D2533-13	ND
2018-06-21	A8D2533-04	0.620 ppb
2018-11-05	A8J2526-04	ND
2018-11-05	A8J2540-04	ND
2018-11-05	A8J2532-04	ND
2018-11-05	A8J2526-07	ND
2018-11-05	A8J2526-08	0.790 ppb
2018-11-05	A8J2526-05	ND
2018-11-05	A8J2532-05	ND
2018-11-06	A8J2540-07	ND
2018-11-06	A8J2526-06	3.60 ppb
2018-11-06	A8J2532-03	ND
2018-11-06	A8J2540-05	ND
2018-11-06	A8J2532-01	ND
2018-11-07	A8K1017-03	0.740 ppb
2018-11-07	A8K1018-01	ND
2018-11-07	A8K1023-04	ND
2018-11-07	A8K1023-01	0.620 ppb
2018-11-07	A8K1023-02	ND
2018-11-07	A8K1023-03	ND
2018-11-07	A8K1017-01	ND
2018-11-07	A8K1017-02	ND
2019-05-14	A9E1784-01	ND
2019-08-06	5810-042-0845	ND
2019-08-06	5810-043-1000	ND
2019-08-06	5810-048-0755	ND
2019-08-06	5810-016-0820	ND
2019-08-06	5810-049-1030	ND
2019-08-06	5810-054-1100	ND
2019-08-08	5810-041-0855	ND
2019-08-08	5810-021-0725	ND
2019-08-08	5810-020-0915	ND
2019-08-08	5810-019-0820	ND
2019-08-13	5810-003-0747	ND
2019-08-13	5810-022-0725	ND
2019-08-13	5810-004-0830	ND
2019-08-13	5810-005-0850	ND
2019-08-13	5810-015-0955	ND
2019-08-13	5810-023-0855	ND
2019-09-19	5810-001-1230	ND
2019-10-03	5810-011-1220	ND
2019-11-26	5810-008-0825	ND