Strontium

City of Tacoma

Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health.

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
2014	0.120 ppb	1	1	0.120 ppb
2015	0.0661 ppb	24	24	0.0120 ppb - 0.120 ppb
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	N/A	0	0	N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1,500 ppb

The EWG Health Guideline of 1,500 ppb for strontium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against harm to bones.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-08-06	201408070493AM	0.120 ppb
2015-03-10	201503120179AM	0.1000 ppb
2015-03-10	201503110935AM	0.0980 ppb
2015-03-10	201502170548AM	0.0120 ppb
2015-03-17	201503190039AM	0.0380 ppb
2015-06-09	201505060002AM	0.0630 ppb
2015-06-09	201505060001AM	0.0140 ppb
2015-06-17	201505060005AM	0.0880 ppb
2015-06-29	201505020034AM	0.0940 ppb
2015-07-06	201505020035AM	0.0960 ppb
2015-07-08	201507090318AM	0.0590 ppb
2015-07-09	201507100395AM	0.0790 ppb
2015-07-09	201506300092AM	0.0490 ppb
2015-08-19	201508200778AM	0.0520 ppb
2015-09-09	201508050009AM	0.0160 ppb
2015-09-09	201508050010AM	0.1000 ppb
2015-09-09	201508050013AM	0.0620 ppb
2015-10-13	201509250020AM	0.120 ppb
2015-12-01	201511130083AM	0.0170 ppb
2015-12-01	201511130086AM	0.0810 ppb
2015-12-02	201511130082AM	0.0130 ppb
2015-12-07	201511130099AM	0.0630 ppb
2015-12-07	201511130096AM	0.0530 ppb
2015-12-08	201511130098AM	0.0990 ppb
2015-12-08	201511130097AM	0.120 ppb