Chromium (hexavalent)

Rancho California Water District

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

MORE ABOUT THIS CONTAMINANT

187

Samples

Samples exceeding legal limit (MCL)

164

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.08 ppb	81	67	ND - 4.10 ppb
2015	1.20 ppb	64	60	ND - 4.10 ppb
2016	2.88 ppb	13	12	ND - 4.10 ppb
2017	2.47 ppb	13	11	ND - 3.90 ppb
2018	2.38 ppb	13	12	ND - 3.00 ppb
2019	1.73 ppb	3	2	ND - 2.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-28	4790-024-0900	3.60 ppb
2014-01-28	4790-027-0915	2.60 ppb
2014-01-28	4790-059-0930	2.30 ppb
2014-04-16	4790-024-0945	4.10 ppb
2014-04-16	4790-027-1015	2.50 ppb
2014-04-16	4790-059-1040	2.70 ppb
2014-07-10	4790-024-0840	3.90 ppb
2014-07-10	4790-027-0915	2.40 ppb
2014-07-10	4790-059-1045	2.40 ppb
2014-07-16	4790-017-1030	0.180 ppb
2014-07-16	4790-019-0930	1.20 ppb
2014-07-16	4790-038-1008	0.780 ppb
2014-07-16	4790-048-1000	0.280 ppb
2014-07-16	4790-071-1100	0.890 ppb
2014-07-23	4790-025-0930	ND
2014-07-23	4790-028-1130	0.0240 ppb
2014-07-23	4790-034-1015	0.510 ppb
2014-07-23	4790-035-1040	0.190 ppb
2014-07-23	4790-037-1100	0.560 ppb
2014-07-23	4790-053-0951	3.20 ppb
2014-07-24	4790-029-1031	0.670 ppb
2014-07-24	4790-045-0945	0.0700 ppb
2014-07-29	4790-051-1045	0.410 ppb
2014-07-29	4790-084-0945	0.0350 ppb
2014-07-29	4790-085-1015	ND
2014-07-29	4790-086-1030	0.0570 ppb
2014-07-29	4790-090-1000	0.0210 ppb
2014-07-30	4790-031-0930	ND
2014-07-30	4790-036-1015	ND
2014-07-30	4790-058-1100	0.0480 ppb
2014-08-12	4790-040-1045	2.80 ppb
2014-08-12	4790-046-0900	ND
2014-08-12	4790-095-0930	ND
2014-08-12	4790-097-1015	ND
2014-08-13	4790-043-1110	ND
2014-08-19	4790-047-1010	ND
2014-10-02	4790-024-0935	4.00 ppb
2014-10-02	4790-027-0920	3.00 ppb
2014-10-02	4790-059-0900	2.70 ppb
2014-10-06	B4J0481-01	ND
2014-10-06	B4J0481-04	1.90 ppb
2014-10-06	B4J0481-08	0.740 ppb
2014-10-07	B4J0640-01	0.860 ppb
2014-10-07	B4J0640-04	0.0370 ppb
2014-10-07	B4J0640-10	3.20 ppb
2014-10-07	B4J0640-07	2.60 ppb
2014-10-08	B4J0845-13	3.90 ppb
2014-10-08	B4J0845-01	3.00 ppb
2014-10-08	B4J0845-04	0.540 ppb
2014-10-08	B4J0845-16	0.120 ppb
2014-10-08	B4J0845-07	0.250 ppb
2014-10-08	B4J0845-10	2.70 ppb
2014-10-08	B4J0845-19	1.10 ppb
2014-10-09	B4J1091-11	ND
2014-10-09	B4J1091-14	0.0660 ppb
2014-10-09	B4J1091-01	0.220 ppb
2014-10-09	B4J1091-03	0.530 ppb
2014-10-09	B4J1091-17	0.490 ppb
2014-10-09	B4J1091-19	3.30 ppb
2014-10-09	B4J1091-05	1.80 ppb
2014-10-09	B4J1091-08	1.10 ppb
2014-10-13	B4J1329-07	1.50 ppb
2014-10-13	B4J1329-16	0.220 ppb
2014-10-13	B4J1329-25	1.10 ppb
2014-10-13	B4J1329-10	1.10 ppb
2014-10-13	B4J1329-01	0.140 ppb
2014-10-13	B4J1329-19	0.770 ppb
2014-10-13	B4J1329-04	0.650 ppb
2014-10-13	B4J1329-13	0.580 ppb
2014-10-13	B4J1329-22	0.240 ppb
2014-10-14	B4J1493-13	ND
2014-10-14	B4J1493-07	0.620 ppb
2014-10-14	B4J1493-10	ND
2014-10-14	B4J1493-01	0.1000 ppb
2014-10-14	B4J1493-04	0.170 ppb
2014-10-15	B4J1671-01	ND
2014-10-17	B4J1897-03	1.000 ppb
2014-10-23	B4J2503-03	0.510 ppb
2014-11-04	B4K0339-01	0.360 ppb
2014-11-06	B4K0694-01	0.0770 ppb
2014-11-14	B4K1419-01	1.80 ppb
2015-01-13	4790-027-0845	2.40 ppb
2015-01-13	4790-059-0915	3.00 ppb
2015-01-15	B5A1539-01	0.0620 ppb
2015-01-15	B5A1539-04	0.160 ppb
2015-01-15	B5A1539-06	0.0890 ppb
2015-01-20	4790-024-1000	3.30 ppb
2015-02-03	B5B0305-01	0.0530 ppb
2015-03-30	B5C2852-04	0.410 ppb
2015-03-30	B5C2852-01	0.0980 ppb
2015-04-02	B5D0198-01	0.0470 ppb
2015-04-02	B5D0198-04	0.0600 ppb
2015-04-02	B5D0201-05	2.60 ppb
2015-04-02	B5D0201-09	0.310 ppb
2015-04-02	B5D0201-03	0.0480 ppb
2015-04-02	B5D0198-09	1.000 ppb
2015-04-02	B5D0198-07	0.260 ppb
2015-04-02	B5D0201-07	0.240 ppb
2015-04-02	B5D0201-01	0.880 ppb
2015-04-02	B5D0201-11	1.30 ppb
2015-04-13	B5D1204-16	ND
2015-04-13	B5D1204-01	4.10 ppb
2015-04-13	B5D1204-04	1.90 ppb
2015-04-13	B5D1204-07	2.00 ppb
2015-04-13	B5D1204-10	1.20 ppb
2015-04-13	B5D1204-22	ND
2015-04-13	B5D1204-19	ND
2015-04-13	B5D1204-13	1.90 ppb
2015-04-14	4790-024-0850	3.40 ppb
2015-04-14	4790-027-0910	2.30 ppb
2015-04-14	4790-059-0920	1.90 ppb
2015-04-15	B5D1533-16	0.230 ppb
2015-04-15	B5D1533-31	1.50 ppb
2015-04-15	B5D1533-07	0.700 ppb
2015-04-15	B5D1533-34	1.10 ppb
2015-04-15	B5D1533-04	0.180 ppb
2015-04-15	B5D1533-22	0.1000 ppb
2015-04-15	B5D1533-25	0.200 ppb
2015-04-15	B5D1533-28	0.520 ppb
2015-04-15	B5D1533-13	1.10 ppb
2015-04-15	B5D1533-01	0.560 ppb
2015-04-15	B5D1533-10	0.300 ppb
2015-04-15	B5D1533-19	0.180 ppb
2015-04-16	B5D1685-10	0.0370 ppb
2015-04-16	B5D1685-01	3.10 ppb
2015-04-16	B5D1685-04	0.540 ppb
2015-04-16	B5D1685-16	3.20 ppb
2015-04-16	B5D1685-07	0.210 ppb
2015-04-16	B5D1685-13	2.60 ppb
2015-04-22	B5D2227-04	1.30 ppb
2015-04-22	B5D2227-01	2.50 ppb
2015-04-29	B5D2887-04	2.50 ppb
2015-04-29	B5D2887-01	ND
2015-07-07	4790-024-0930	3.70 ppb
2015-07-07	4790-027-0915	2.60 ppb
2015-07-07	4790-059-0845	2.60 ppb
2015-07-21	B5G2279-01	0.0480 ppb
2015-07-21	B5G2279-04	0.0720 ppb
2015-07-21	B5G2279-09	0.460 ppb
2015-07-21	B5G2279-07	0.670 ppb
2015-08-20	B5H2092-04	0.570 ppb
2015-08-20	B5H2092-01	0.0910 ppb
2015-10-08	4790-024-0900	3.40 ppb
2015-10-08	4790-027-0915	2.40 ppb
2015-10-08	4790-059-0930	2.30 ppb
2016-01-12	4790-024-0840	3.90 ppb
2016-01-12	4790-027-0905	2.60 ppb
2016-01-12	4790-059-0940	2.90 ppb
2016-02-29	4790-150-1830	ND
2016-04-21	4790-024-0930	3.90 ppb
2016-04-21	4790-027-1015	2.80 ppb
2016-04-21	4790-059-1045	2.50 ppb
2016-07-13	4790-024-0845	4.00 ppb
2016-07-13	4790-027-0930	2.60 ppb
2016-07-13	4790-059-0945	2.50 ppb
2016-10-05	4790-024-1115	4.10 ppb
2016-10-05	4790-027-1145	2.90 ppb
2016-10-05	4790-059-1200	2.80 ppb
2017-01-26	4790-024-0900	3.50 ppb
2017-01-26	4790-059-0930	2.60 ppb
2017-04-11	4790-024-0904	3.90 ppb
2017-04-19	4790-059-0950	2.50 ppb
2017-05-14	4790-027-0830	2.20 ppb
2017-07-11	4790-024-0945	3.50 ppb
2017-07-11	4790-027-1005	2.40 ppb
2017-07-11	4790-059-1033	2.50 ppb
2017-09-01	4790-150-0930	ND
2017-10-10	4790-059-1031	2.50 ppb
2017-10-17	4790-027-1022	2.70 ppb
2017-10-19	4790-024-0932	3.80 ppb
2017-11-22	4790-151-1100	ND
2018-01-17	4790-024-0908	1.90 ppb
2018-01-17	4790-027-0936	2.40 ppb
2018-01-17	4790-059-0957	2.40 ppb
2018-04-11	4790-027-1110	2.50 ppb
2018-04-11	4790-059-1140	2.70 ppb
2018-04-13	4790-024-1040	3.00 ppb
2018-04-25	4790-152-1135	ND
2018-07-11	4790-024-1010	3.00 ppb
2018-07-11	4790-027-0915	2.70 ppb
2018-07-11	4790-059-0950	2.60 ppb
2018-10-05	4790-024-0850	2.30 ppb
2018-10-05	4790-027-0830	2.80 ppb
2018-10-05	4790-059-0755	2.60 ppb
2019-01-08	4790-024-1020	ND
2019-01-08	4790-027-1045	2.60 ppb
2019-01-08	4790-059-1110	2.60 ppb