Manganese

Golden State Water Company (GSWC) - Norwalk

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	ND	1	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	11	ND
2019	ND	12	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
2015-02-02	2706-010-1023	ND
2018-02-12	9590-010-1230	ND
2018-03-06	9590-034-1158	ND
2018-04-03	9590-034-1229	ND
2018-05-01	9590-034-1345	ND
2018-06-06	9590-034-1005	ND
2018-07-09	9590-034-1317	ND
2018-08-06	9590-034-1226	ND
2018-09-06	9590-034-1235	ND
2018-10-04	9590-034-1015	ND
2018-11-06	9590-034-1330	ND
2018-12-04	9590-034-1403	ND
2019-01-02	9590-034-1054	ND
2019-02-13	9590-034-1135	ND
2019-03-06	9590-034-1219	ND
2019-04-02	9590-034-1139	ND
2019-05-06	9590-034-1141	ND
2019-06-04	9590-034-1106	ND
2019-07-02	9590-034-1153	ND
2019-08-06	9590-034-0827	ND
2019-09-04	9590-034-1119	ND
2019-10-01	9590-034-1111	ND
2019-11-06	9590-034-1116	ND
2019-12-03	9590-034-1117	ND
2020-02-04	202002040656	0.770 ppb
2020-02-04	202002040643	ND
2020-02-04	202002040652	2.70 ppb
2020-02-05	202002050621	4.40 ppb
2020-05-11	202005110646	0.720 ppb
2020-08-10	202008100263	ND
2020-08-10	202008100308	ND
2020-08-10	202008100261	ND
2020-11-09	202011090257	1.20 ppb