Chromium (total)

California Water Service Company - Dixon

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.

MORE ABOUT THIS CONTAMINANT

128

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	18.6 ppb	16	16	16.5 ppb - 27.0 ppb
2015	15.8 ppb	46	44	ND - 37.5 ppb
2016	6.57 ppb	27	16	ND - 28.0 ppb
2017	1.85 ppb	13	1	ND - 24.0 ppb
2018	3.14 ppb	13	2	ND - 23.8 ppb
2019	1.46 ppb	13	1	ND - 19.0 ppb

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
2014-01-09	5810-008-1006	20.0 ppb
2014-01-09	5701-008-1136	18.1 ppb
2014-02-04	5701-007-1532	21.0 ppb
2014-02-24	5701-002-1416	17.6 ppb
2014-02-24	5701-002-1421	18.1 ppb
2014-02-24	5701-002-1426	16.7 ppb
2014-02-24	5701-002-1431	16.5 ppb
2014-02-24	5701-002-1446	17.1 ppb
2014-02-24	5701-002-1501	16.8 ppb
2014-02-24	5701-002-1516	17.1 ppb
2014-02-24	5701-002-1546	17.8 ppb
2014-02-24	5701-002-1616	17.4 ppb
2014-05-20	5701-003-1135	22.1 ppb
2014-05-20	5810-003-1142	27.0 ppb
2014-05-20	5701-005-0852	17.4 ppb
2014-05-20	5701-007-1001	16.6 ppb
2015-02-11	5810-002-1343	14.0 ppb
2015-02-11	5810-006-1003	24.0 ppb
2015-04-15	5701-007-1441	32.6 ppb
2015-05-11	5810-005-1356	18.0 ppb
2015-06-08	5701-007-1255	28.8 ppb
2015-07-29	5701-017-1419	37.5 ppb
2015-07-29	5701-019-1421	19.3 ppb
2015-08-04	5701-017-1002	34.2 ppb
2015-08-04	5701-019-1000	14.4 ppb
2015-08-10	5701-017-1130	33.6 ppb
2015-08-10	5701-019-1132	10.8 ppb
2015-08-18	5701-017-1412	33.3 ppb
2015-08-18	5701-019-1410	11.4 ppb
2015-08-27	5701-017-0852	32.9 ppb
2015-08-27	5701-019-0851	9.92 ppb
2015-08-31	5701-017-0832	35.3 ppb
2015-08-31	5701-019-0830	14.1 ppb
2015-09-03	5701-002-1417	18.5 ppb
2015-09-03	5701-010-1419	3.65 ppb
2015-09-04	5701-002-1202	22.4 ppb
2015-09-04	5701-010-1207	6.27 ppb
2015-09-08	5701-002-1359	19.2 ppb
2015-09-08	5701-010-1407	ND
2015-09-09	5701-002-1401	22.2 ppb
2015-09-09	5701-010-1404	6.94 ppb
2015-09-10	5701-002-1418	19.5 ppb
2015-09-10	5701-010-1423	6.82 ppb
2015-09-17	5701-010-1119	6.65 ppb
2015-09-22	5701-010-1444	5.96 ppb
2015-09-28	5701-010-1110	5.70 ppb
2015-10-13	5701-010-1415	8.83 ppb
2015-10-13	5701-010-1422	8.24 ppb
2015-10-20	5701-010-1117	9.52 ppb
2015-10-26	5701-010-1411	8.25 ppb
2015-11-03	5701-010-1330	12.1 ppb
2015-11-09	5701-010-1020	9.13 ppb
2015-11-18	5701-010-1128	11.0 ppb
2015-11-23	5701-010-0934	9.68 ppb
2015-12-28	5701-008-1539	23.9 ppb
2015-12-28	5701-015-1541	1.20 ppb
2015-12-29	5701-008-1052	24.2 ppb
2015-12-29	5701-015-1054	1.40 ppb
2015-12-30	5701-008-1446	25.5 ppb
2015-12-30	5701-015-1448	1.73 ppb
2015-12-31	5701-008-1436	25.8 ppb
2015-12-31	5701-015-1438	ND
2016-01-01	5701-008-1500	26.5 ppb
2016-01-01	5701-015-1502	ND
2016-01-06	5701-015-1122	3.10 ppb
2016-01-12	5701-015-1421	ND
2016-01-20	5701-015-0938	8.74 ppb
2016-01-26	5701-015-1400	ND
2016-02-03	5701-015-0920	7.77 ppb
2016-02-09	5701-015-1508	ND
2016-02-17	5701-015-0949	7.17 ppb
2016-02-24	5701-015-1134	8.57 ppb
2016-03-03	5701-015-1458	ND
2016-03-10	5701-015-0927	5.97 ppb
2016-03-14	5810-008-1402	18.0 ppb
2016-03-14	5701-015-1409	3.78 ppb
2016-03-23	5701-015-1359	ND
2016-03-29	5701-015-0929	4.76 ppb
2016-04-05	5701-015-1052	ND
2016-05-03	5701-015-1400	ND
2016-06-02	5701-015-1000	11.7 ppb
2016-06-13	9590-020-1700	14.0 ppb
2016-07-05	5701-015-0810	8.23 ppb
2016-08-02	5701-015-1150	10.1 ppb
2016-09-12	5701-015-1327	ND
2016-09-12	5810-017-1415	28.0 ppb
2016-10-04	5701-015-1351	10.8 ppb
2016-11-09	5701-015-1428	ND
2016-12-07	5701-015-1101	ND
2017-01-11	5701-015-1443	ND
2017-02-07	5701-015-1636	ND
2017-03-09	5701-015-1400	ND
2017-04-04	5701-015-1115	ND
2017-05-02	5701-015-1131	ND
2017-06-06	5701-015-1527	ND
2017-07-06	5701-015-1420	ND
2017-08-08	5701-015-1103	ND
2017-09-06	5701-015-1110	ND
2017-09-12	5810-017-1454	24.0 ppb
2017-10-05	5701-015-1020	ND
2017-11-07	5701-015-1515	ND
2017-12-14	5701-015-1048	ND
2018-01-09	5701-015-1030	ND
2018-02-06	5701-015-1155	ND
2018-03-07	5701-015-1122	ND
2018-04-04	5701-015-1037	ND
2018-05-01	5701-015-1022	ND
2018-06-07	5701-015-1340	23.8 ppb
2018-07-10	5701-015-1520	ND
2018-08-13	5701-015-1403	ND
2018-09-11	5701-015-1617	ND
2018-09-13	5810-002-1227	17.0 ppb
2018-10-16	5701-015-0954	ND
2018-11-07	5810-015-1355	ND
2018-12-19	5701-015-1016	ND
2019-01-08	5701-015-1412	ND
2019-02-11	5701-015-1559	ND
2019-03-05	5701-015-1039	ND
2019-03-20	5810-008-1352	19.0 ppb
2019-04-08	5701-015-1335	ND
2019-05-06	5701-015-0852	ND
2019-06-05	5701-015-0659	ND
2019-07-02	5701-015-1048	ND
2019-08-06	5701-015-1002	ND
2019-09-04	5701-015-1000	ND
2019-10-07	5701-015-1403	ND
2019-11-18	5701-015-0957	ND
2019-12-02	5701-015-1452	ND