Chromium (total)

City of Banning

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
2013	5.20 ppb	51	51	0.260 ppb - 16.0 ppb
2014	6.89 ppb	7	4	ND - 15.0 ppb
2015	10.1 ppb	3	3	8.50 ppb - 12.0 ppb
2016	4.83 ppb	6	2	ND - 19.0 ppb
2017	4.84 ppb	7	3	ND - 15.0 ppb
2018	8.48 ppb	4	3	ND - 13.0 ppb
2019	7.50 ppb	4	2	ND - 20.0 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
2013-01-09	B3A0840-01	0.430 ppb
2013-01-09	B3A0840-03A	0.400 ppb
2013-01-09	B3A0840-11	8.80 ppb
2013-01-09	B3A0840-05A	0.360 ppb
2013-01-09	B3A0840-07A	0.400 ppb
2013-01-09	B3A0840-09A	4.50 ppb
2013-01-16	B3A1607-07A	0.400 ppb
2013-01-16	B3A1607-05A	0.400 ppb
2013-01-16	B3A1607-09A	0.410 ppb
2013-01-16	B3A1607-13A	14.0 ppb
2013-01-16	B3A1607-11A	9.00 ppb
2013-01-16	B3A1607-03A	0.400 ppb
2013-01-16	B3A1607-01A	0.450 ppb
2013-01-23	B3A2295-05A	10.00 ppb
2013-01-23	B3A2295-07A	9.70 ppb
2013-01-23	B3A2295-09A	16.0 ppb
2013-01-23	B3A2295-03A	14.0 ppb
2013-01-23	B3A2295-01A	0.480 ppb
2013-01-30	B3A3014-05A	3.50 ppb
2013-01-30	B3A3014-07A	0.620 ppb
2013-01-30	B3A3014-09A	0.490 ppb
2013-01-30	B3A3014-01A	2.10 ppb
2013-01-30	B3A3014-03A	1.60 ppb
2013-02-06	B3B0498-03A	13.0 ppb
2013-02-06	B3B0498-05	11.0 ppb
2013-02-06	B3B0498-01A	2.40 ppb
2013-07-09	B3G0863-07	0.260 ppb
2013-07-09	B3G0863-05	0.300 ppb
2013-07-09	B3G0863-09	0.300 ppb
2013-07-09	B3G1075-03	7.10 ppb
2013-07-09	B3G0863-03	0.400 ppb
2013-07-09	B3G0863-01	0.370 ppb
2013-07-10	B3G1075-05	8.30 ppb
2013-07-10	B3G1075-01	12.0 ppb
2013-07-10	B3G1075-07	13.0 ppb
2013-07-16	B3G1566-03	16.0 ppb
2013-07-16	B3G1566-09	0.390 ppb
2013-07-16	B3G1566-07	0.300 ppb
2013-07-16	B3G1566-05	10.00 ppb
2013-07-16	B3G1566-01	8.50 ppb
2013-07-23	B3G2265-03	0.320 ppb
2013-07-23	B3G2265-01	11.0 ppb
2013-07-23	B3G2265-09	0.360 ppb
2013-07-23	B3G2265-05	14.0 ppb
2013-07-23	B3G2265-07	0.330 ppb
2013-07-24	B3G2344-01	10.00 ppb
2013-07-24	B3G2344-03	10.00 ppb
2013-07-24	B3G2344-05	9.10 ppb
2013-07-24	B3G2344-09	0.420 ppb
2013-07-24	B3G2344-07	0.290 ppb
2013-10-03	B3J0384-01	7.50 ppb
2014-03-13	4790-016-1400	13.0 ppb
2014-03-13	4790-003-0900	ND
2014-03-13	4790-008-1000	ND
2014-03-18	4790-014-1300	15.0 ppb
2014-03-18	4790-015-0830	13.0 ppb
2014-03-18	4790-017-1000	7.20 ppb
2014-03-19	4790-009-1000	ND
2015-03-18	4790-018-1030	12.0 ppb
2015-03-18	4790-021-0930	8.50 ppb
2015-03-19	4790-026-1340	9.90 ppb
2016-02-17	4790-007-1100	ND
2016-02-17	4790-010-1000	ND
2016-02-25	4790-002-0930	ND
2016-02-25	4790-001-1030	ND
2016-03-09	4790-028-0930	19.0 ppb
2016-08-25	4790-027-0930	10.00 ppb
2017-03-06	4790-016-0900	9.90 ppb
2017-03-06	4790-009-1230	ND
2017-03-06	4790-008-1130	ND
2017-03-08	4790-017-0930	9.00 ppb
2017-03-08	4790-015-1100	15.0 ppb
2017-05-11	4790-012-1330	ND
2017-05-11	4790-011-1245	ND
2018-02-14	4790-018-0830	13.0 ppb
2018-02-14	4790-021-0930	9.90 ppb
2018-05-10	4790-026-1320	11.0 ppb
2018-05-31	4790-003-1000	ND
2019-01-30	4790-027-1230	10.00 ppb
2019-01-30	4790-028-1130	20.0 ppb
2019-02-07	4790-027-0900	ND
2019-02-07	4790-010-1000	ND