Manganese

California Water Service (CWS) - Los Altos Suburban

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

138

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	2.81 ppb	17	14	ND - 28.6 ppb
2015	0.604 ppb	20	3	ND - 6.05 ppb
2016	ND	18	0	ND
2017	ND	14	0	ND
2018	0.364 ppb	34	5	ND - 6.40 ppb
2019	0.959 ppb	33	11	ND - 9.60 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
2014-03-05	5701-035-1044	28.6 ppb
2014-06-04	5701-032-1145	1.51 ppb
2014-06-04	5701-035-1110	5.93 ppb
2014-09-09	5810-011-1250	ND
2014-09-09	5701-032-1450	1.38 ppb
2014-09-09	5701-035-1412	4.11 ppb
2014-09-10	5810-010-1019	ND
2014-09-10	5810-016-1125	ND
2014-10-02	5701-008-1400	0.1000 ppb
2014-10-02	5701-010-0925	0.00300 ppb
2014-10-02	5701-013-1125	0.176 ppb
2014-11-05	5701-016-1153	0.0910 ppb
2014-11-05	5701-020-1043	0.0240 ppb
2014-11-05	5701-021-1120	0.0480 ppb
2014-11-05	5701-032-1455	1.00 ppb
2014-12-02	5701-032-1200	0.122 ppb
2014-12-02	5701-035-1245	4.77 ppb
2015-02-03	5810-013-1115	ND
2015-02-03	5810-015-0916	ND
2015-02-03	5810-021-1002	ND
2015-03-05	5810-022-1100	ND
2015-03-05	5701-035-1353	5.29 ppb
2015-04-09	5810-008-1100	ND
2015-04-09	5810-020-1201	ND
2015-05-13	5810-018-1347	ND
2015-06-03	5701-032-1300	0.738 ppb
2015-06-03	5701-035-1350	6.05 ppb
2015-08-04	5810-023-0948	ND
2015-08-04	5810-035-0915	ND
2015-09-02	5701-032-1212	ND
2015-09-02	5701-035-1440	ND
2015-09-15	5810-032-1220	ND
2015-09-15	5810-057-1240	ND
2015-10-06	5810-002-1300	ND
2015-12-09	5701-032-1136	ND
2015-12-09	5701-032-1140	ND
2015-12-09	5701-035-1211	ND
2016-03-08	5701-032-1055	ND
2016-03-08	5701-032-1100	ND
2016-03-21	5701-035-1057	ND
2016-03-23	5810-028-1120	ND
2016-03-23	5810-030-1140	ND
2016-06-01	5701-032-1032	ND
2016-06-01	5701-032-1034	ND
2016-06-01	5701-032-1036	ND
2016-06-01	5701-035-1045	ND
2016-06-15	5810-024-1245	ND
2016-08-09	5810-037-1310	ND
2016-09-07	5810-029-1322	ND
2016-09-07	5701-032-1340	ND
2016-09-07	5701-032-1341	ND
2016-09-07	5701-035-1355	ND
2016-12-05	5701-032-1310	ND
2016-12-05	5701-032-1311	ND
2016-12-05	5701-035-1413	ND
2017-01-11	5810-010-1245	ND
2017-01-11	5810-011-1300	ND
2017-03-08	5701-032-1055	ND
2017-03-08	5701-035-1140	ND
2017-06-07	5701-032-1300	ND
2017-06-07	5701-032-1302	ND
2017-06-07	5701-035-1245	ND
2017-09-12	5810-032-1232	ND
2017-09-12	5701-032-1233	ND
2017-09-12	5810-035-1253	ND
2017-10-11	5810-016-1215	ND
2017-12-06	5701-032-1225	ND
2017-12-06	5701-032-1226	ND
2017-12-06	5701-035-1210	ND
2018-02-12	5810-013-1230	ND
2018-02-12	5810-021-1415	ND
2018-03-20	5701-032-1340	ND
2018-03-20	5810-032-1345	ND
2018-03-20	5810-035-1351	ND
2018-05-08	5810-018-1335	ND
2018-05-16	5810-023-1020	ND
2018-06-06	5701-032-1325	ND
2018-06-06	5701-035-1310	ND
2018-07-10	5810-008-1305	ND
2018-08-07	B8H0985-01	ND
2018-08-08	5810-022-1335	ND
2018-08-13	B8H1635-04	ND
2018-08-13	B8H1635-01	3.10 ppb
2018-08-13	B8H1635-02	1.40 ppb
2018-08-13	B8H1635-03	ND
2018-08-14	B8H1911-01	0.680 ppb
2018-08-21	B8H2749-01	ND
2018-08-21	B8H2749-02	6.40 ppb
2018-08-22	B8H2946-01	ND
2018-08-22	B8H2946-03	ND
2018-08-22	B8H2946-02	ND
2018-09-18	5701-032-1314	ND
2018-09-18	5701-032-1315	ND
2018-09-18	5810-032-1320	ND
2018-09-18	5701-035-1345	ND
2018-09-18	5810-035-1347	ND
2018-09-18	5810-057-1225	ND
2018-09-20	B8I2660-01	0.810 ppb
2018-10-10	5810-002-1431	ND
2018-11-06	B8K0792-05	ND
2018-12-04	5810-032-1454	ND
2018-12-04	5810-035-1435	ND
2018-12-26	5810-020-1420	ND
2019-02-04	B9B0398-02	ND
2019-02-04	B9B0398-01	0.430 ppb
2019-02-05	B9B0596-01	ND
2019-02-06	B9B0830-01	1.90 ppb
2019-02-12	B9B1500-01	ND
2019-02-12	B9B1500-02	0.930 ppb
2019-02-12	B9B1500-03	0.690 ppb
2019-02-12	B9B1500-04	9.30 ppb
2019-02-12	B9B1500-05	1.80 ppb
2019-02-13	B9B1749-01	4.20 ppb
2019-02-20	B9B2511-01	ND
2019-02-20	B9B2511-02	0.420 ppb
2019-02-20	B9B2511-03	ND
2019-02-20	B9B2511-04	9.60 ppb
2019-02-21	B9B2619-01	1.90 ppb
2019-03-05	5701-032-1223	ND
2019-03-05	5810-032-1225	ND
2019-03-05	5810-035-1240	ND
2019-03-19	5810-028-1357	ND
2019-03-19	5810-030-1343	ND
2019-05-08	B9E1259-01	ND
2019-06-05	5701-032-1538	ND
2019-06-05	5810-032-1539	ND
2019-06-05	5810-035-1551	ND
2019-06-18	5810-024-1336	ND
2019-08-19	B9H2683-01	0.480 ppb
2019-08-20	5810-037-1125	ND
2019-09-11	5810-029-1418	ND
2019-09-17	5810-032-1525	ND
2019-09-17	5810-035-1545	ND
2019-11-06	B9K0888-01	ND
2019-12-03	5810-032-1428	ND
2019-12-03	5810-035-1450	ND
2020-02-03	C0B0232-01	ND
2020-05-05	C0E0672-01	ND