Manganese

Dover Water Department

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	3.40 ppb	3	1	ND - 10.2 ppb
2015	N/A	0	0	N/A
2016	30.4 ppb	4	2	ND - 80.2 ppb
2017	8.16 ppb	5	3	ND - 29.6 ppb
2018	ND	1	0	ND
2019	41.5 ppb	12	9	ND - 254.0 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
2014-02-18	A400694002	10.2 ppb
2014-07-14	A404793003	ND
2014-07-23	A405333004	ND
2016-07-06	B605223003	41.2 ppb
2016-07-07	B605299002	ND
2016-07-13	B605689002	ND
2016-07-25	B606384002	80.2 ppb
2017-06-01	B703156002	6.20 ppb
2017-07-19	B705657004	ND
2017-07-20	B705749002	5.00 ppb
2017-07-20	B705749004	ND
2017-07-20	B705749006	29.6 ppb
2018-05-15	B802449002	ND
2019-03-12	4224480	1.40 ppb
2019-03-12	4224304	1.13 ppb
2019-03-18	4230261	ND
2019-03-20	4233286	35.7 ppb
2019-03-20	4233330	254.0 ppb
2019-07-10	B905242002	56.2 ppb
2019-07-10	B905242004	ND
2019-09-18	4427189	3.44 ppb
2019-09-18	4427183	1.79 ppb
2019-09-18	4427020	ND
2019-09-24	4433778	76.6 ppb
2019-09-24	4433865	67.6 ppb