Chromium (total)

East Valley Water District

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

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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	0.484 ppb	55	37	ND - 2.40 ppb
2015	ND	2	0	ND
2016	ND	18	0	ND
2017	ND	2	0	ND
2018	ND	1	0	ND
2019	ND	16	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-05	B4B0490-01	0.920 ppb
2014-02-05	B4B0490-03	0.340 ppb
2014-02-10	B4B0801-03	0.590 ppb
2014-02-10	B4B0801-09	0.700 ppb
2014-02-10	B4B0801-05	0.600 ppb
2014-02-10	B4B0801-07	0.230 ppb
2014-02-10	B4B0801-01	0.900 ppb
2014-02-13	B4B1374-01	0.720 ppb
2014-02-13	B4B1374-03	1.000 ppb
2014-02-13	B4B1374-05	2.10 ppb
2014-02-20	B4B1932-03	0.230 ppb
2014-02-20	B4B1932-09	ND
2014-02-20	B4B1932-07	0.720 ppb
2014-02-20	B4B1932-05	ND
2014-02-20	B4B1932-11	ND
2014-02-25	B4B2210-05	ND
2014-02-25	B4B2210-03	0.200 ppb
2014-02-25	B4B2210-01	ND
2014-04-10	B4D1246-09	0.270 ppb
2014-04-10	B4D1246-03	1.30 ppb
2014-04-10	B4D1246-07	0.410 ppb
2014-04-10	B4D1246-01	0.350 ppb
2014-04-10	B4D1246-05	0.570 ppb
2014-05-20	B4E1846-01	ND
2014-05-20	B4E1846-03	ND
2014-05-22	B4E2247-01	ND
2014-06-18	3761-002-0940	ND
2014-07-23	3761-028-1130	ND
2014-08-07	B4H0660-03	0.220 ppb
2014-08-07	B4H0660-05	0.500 ppb
2014-08-07	B4H0656-01	ND
2014-08-07	B4H0656-05	1.30 ppb
2014-08-07	B4H0656-03	0.910 ppb
2014-08-07	B4H0660-07	0.510 ppb
2014-08-07	B4H0660-01	0.220 ppb
2014-08-14	B4H1446-09	0.920 ppb
2014-08-14	B4H1446-01	ND
2014-08-14	B4H1446-11	ND
2014-08-14	B4H1446-03	0.300 ppb
2014-08-14	B4H1446-07	0.640 ppb
2014-08-14	B4H1446-05	0.870 ppb
2014-08-15	3761-036-0800	ND
2014-08-21	B4H2206-01	1.80 ppb
2014-08-21	B4H2206-07	0.330 ppb
2014-08-21	B4H2206-05	0.770 ppb
2014-08-21	B4H2206-03	2.40 ppb
2014-08-21	B4H2206-09	0.810 ppb
2014-08-21	B4H2206-11	0.550 ppb
2014-08-28	B4H2879-01	0.550 ppb
2014-08-28	B4H2879-07	0.210 ppb
2014-08-28	B4H2879-05	ND
2014-08-28	B4H2879-03	ND
2014-08-28	B4H2879-09	0.670 ppb
2014-11-14	B4K1386-01	ND
2014-11-14	B4K1386-03	ND
2015-06-23	3761-002-0940	ND
2015-06-23	3761-036-0845	ND
2016-03-17	3761-036-0923	ND
2016-06-07	3761-039-0825	ND
2016-06-07	3761-015-0850	ND
2016-06-07	3761-055-0855	ND
2016-06-07	3761-016-1000	ND
2016-06-07	3761-017-0831	ND
2016-06-07	3761-020-0841	ND
2016-06-07	3761-021-0900	ND
2016-06-07	3761-024-0925	ND
2016-06-07	3761-031-0845	ND
2016-06-07	3761-053-0810	ND
2016-06-07	3761-042-0810	ND
2016-06-08	3761-046-0710	ND
2016-06-09	3761-036-0000	ND
2016-06-14	3761-032-0745	ND
2016-06-14	3761-019-0816	ND
2016-06-14	3761-023-0955	ND
2016-10-26	3761-033-0737	ND
2017-06-06	3761-036-1021	ND
2017-12-05	3761-028-0850	ND
2018-06-07	3761-036-0833	ND
2019-06-04	3761-033-0734	ND
2019-06-04	3761-017-0933	ND
2019-06-04	3761-020-0841	ND
2019-06-07	3761-036-1040	ND
2019-06-11	3761-032-0752	ND
2019-06-11	3761-042-0743	ND
2019-06-11	3761-021-0836	ND
2019-06-11	3761-023-0810	ND
2019-06-11	3761-024-0850	ND
2019-06-18	3761-019-0808	ND
2019-06-18	3761-031-0744	ND
2019-06-18	3761-053-0734	ND
2019-06-18	3761-015-0715	ND
2019-06-21	3761-046-0811	ND
2019-06-21	3761-039-0823	ND
2019-06-21	3761-055-0000	ND