Chromium (total)

Cal-water Service Company - Chico

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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176

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	1.52 ppb	27	27	0.400 ppb - 6.40 ppb
2014	1.80 ppb	65	46	ND - 6.60 ppb
2015	0.468 ppb	19	3	ND - 4.30 ppb
2016	ND	16	0	ND
2017	ND	27	0	ND
2018	ND	7	0	ND
2019	ND	15	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
2013-07-08	201307090265AM	4.00 ppb
2013-07-09	201307100960AM	1.20 ppb
2013-07-10	201307110727AM	1.40 ppb
2013-07-10	201307110718AM	0.740 ppb
2013-07-23	201307240451AM	6.40 ppb
2013-07-24	201307250295AM	2.90 ppb
2013-08-05	201308060206AM	0.400 ppb
2013-08-05	201308060171AM	1.000 ppb
2013-08-07	201308080253AM	0.740 ppb
2013-08-07	201308080294AM	0.910 ppb
2013-08-14	201308150416AM	1.30 ppb
2013-08-14	201308150373AM	0.570 ppb
2013-08-14	201308150516AM	0.520 ppb
2013-08-20	201308210542AM	0.960 ppb
2013-08-20	201308210528AM	0.530 ppb
2013-08-21	201308220225AM	0.870 ppb
2013-08-21	201308220195AM	1.50 ppb
2013-08-27	201308290350AM	4.90 ppb
2013-09-17	201309180767AM	3.40 ppb
2013-09-17	201309180757AM	0.840 ppb
2013-09-17	201309180524AM	0.860 ppb
2013-09-18	201309200061AM	1.10 ppb
2013-10-08	201310090470AM	0.740 ppb
2013-10-08	201310090667AM	0.910 ppb
2013-10-08	201310090479AM	1.10 ppb
2013-10-15	201310160273AM	0.510 ppb
2013-10-15	201310160227AM	0.620 ppb
2014-01-07	201401080518AM	4.80 ppb
2014-01-07	201401080499AM	2.60 ppb
2014-01-08	201401090452AM	3.40 ppb
2014-01-14	201401150437AM	5.10 ppb
2014-01-14	201401150420AM	6.00 ppb
2014-01-21	5810-134-1010	ND
2014-01-22	201401230435AM	0.720 ppb
2014-01-22	201401230384AM	0.710 ppb
2014-01-28	201401290598AM	0.540 ppb
2014-02-05	5810-005-1018	ND
2014-02-05	5810-010-1048	ND
2014-02-05	5810-017-1250	ND
2014-02-11	5810-006-1047	ND
2014-02-12	201402130426AM	1.30 ppb
2014-02-12	201402130417AM	1.000 ppb
2014-02-12	201402130407AM	0.430 ppb
2014-02-19	201402200380AM	0.650 ppb
2014-02-26	201402270250AM	1.30 ppb
2014-02-26	201402270199AM	0.440 ppb
2014-02-28	201403010098AM	2.20 ppb
2014-03-04	5810-018-1120	ND
2014-03-05	201403060273AM	3.80 ppb
2014-03-11	5810-007-1107	ND
2014-03-17	201403180362AM	5.60 ppb
2014-03-17	201403180218AM	4.20 ppb
2014-03-17	201403180311AM	4.40 ppb
2014-03-18	201403190839AM	6.60 ppb
2014-03-18	201403190854AM	5.00 ppb
2014-04-08	201404090695AM	ND
2014-04-08	201404090704AM	0.870 ppb
2014-04-08	201404090547AM	0.310 ppb
2014-04-09	5810-011-1025	ND
2014-04-22	201404230455AM	1.000 ppb
2014-04-23	201404240400AM	3.10 ppb
2014-04-23	201404240507AM	1.000 ppb
2014-05-12	5810-069-0910	ND
2014-05-12	5810-136-0930	ND
2014-05-28	5810-062-0820	ND
2014-06-04	5810-019-0858	ND
2014-06-18	201406190413AM	2.70 ppb
2014-07-09	201407100535AM	0.730 ppb
2014-07-09	201407100477AM	0.730 ppb
2014-07-14	5810-013-1030	ND
2014-08-05	201408060341AM	2.20 ppb
2014-08-05	201408060375AM	1.20 ppb
2014-08-05	201408060311AM	2.40 ppb
2014-08-06	201408070483AM	1.10 ppb
2014-08-12	5810-037-0904	ND
2014-08-13	5810-065-0825	ND
2014-09-09	201409110344AM	4.50 ppb
2014-09-09	201409100881AM	3.80 ppb
2014-09-09	201409110323AM	5.80 ppb
2014-09-10	201409110683AM	6.50 ppb
2014-09-10	201409110779AM	6.20 ppb
2014-09-16	5810-020-1003	ND
2014-09-23	201409240601AM	0.840 ppb
2014-09-24	201409250608AM	1.40 ppb
2014-10-07	201410080329AM	1.000 ppb
2014-10-07	201410080394AM	1.10 ppb
2014-10-08	201410090318AM	0.910 ppb
2014-10-13	5810-050-0945	ND
2014-10-15	201410160406AM	ND
2014-10-27	201410280387AM	0.740 ppb
2014-10-27	201410290065AM	3.40 ppb
2014-12-09	201412100749AM	2.60 ppb
2015-01-13	201501140882AM	0.600 ppb
2015-01-14	5810-035-0820	ND
2015-02-24	5810-034-1030	ND
2015-02-25	5810-028-1120	ND
2015-03-03	5810-030-1150	ND
2015-03-25	201503260846AM	4.00 ppb
2015-04-13	5810-075-0958	ND
2015-05-13	5810-029-1310	ND
2015-05-13	5810-032-1000	ND
2015-05-13	5810-036-1044	ND
2015-05-20	5810-027-0915	ND
2015-06-09	5810-031-1020	ND
2015-06-09	5810-064-0915	ND
2015-06-16	5810-063-0910	ND
2015-07-14	5810-052-0700	ND
2015-08-06	5810-033-1005	ND
2015-08-11	5810-143-0845	ND
2015-08-17	201508190229AM	4.30 ppb
2015-09-14	5810-005-1025	ND
2016-02-17	5810-043-1018	ND
2016-02-17	5810-076-0830	ND
2016-02-24	5810-023-0955	ND
2016-03-09	5810-074-0930	ND
2016-04-13	5810-041-1105	ND
2016-04-13	5810-054-0810	ND
2016-04-13	5810-061-0830	ND
2016-04-20	5810-038-1315	ND
2016-05-17	5810-026-1240	ND
2016-05-17	5810-077-0830	ND
2016-05-17	5810-140-0840	ND
2016-07-12	5810-049-1230	ND
2016-08-10	5810-056-1014	ND
2016-08-10	5810-059-0846	ND
2016-10-12	5810-048-0825	ND
2016-10-12	5810-057-1128	ND
2017-01-11	5810-134-1320	ND
2017-01-18	5810-035-0837	ND
2017-02-15	5810-005-0945	ND
2017-02-15	5810-010-1150	ND
2017-02-15	5810-017-1018	ND
2017-02-15	5810-028-1305	ND
2017-03-13	5810-018-0805	ND
2017-03-15	5810-007-0853	ND
2017-03-16	5810-030-1115	ND
2017-03-16	5810-034-0600	ND
2017-04-19	5810-011-0850	ND
2017-05-11	5810-036-1200	ND
2017-05-11	5810-050-1135	ND
2017-05-17	5810-136-1120	ND
2017-05-23	5810-026-1315	ND
2017-06-07	5810-031-1230	ND
2017-06-07	5810-032-1200	ND
2017-06-07	5810-069-1120	ND
2017-06-12	5810-053-1255	ND
2017-06-26	5810-019-1329	ND
2017-06-28	5810-029-1145	ND
2017-07-27	5810-029-1208	ND
2017-08-21	5810-033-1240	ND
2017-08-21	5810-037-1210	ND
2017-08-21	5810-065-1150	ND
2017-09-20	5810-020-1240	ND
2017-10-25	5810-062-1158	ND
2018-04-12	5810-075-1255	ND
2018-06-12	5810-052-1312	ND
2018-06-18	5810-064-1247	ND
2018-06-20	5810-063-1154	ND
2018-07-18	5810-023-0830	ND
2018-08-15	5810-143-1201	ND
2018-10-30	5810-027-1253	ND
2019-02-20	5810-043-1253	ND
2019-02-20	5810-076-1257	ND
2019-03-26	5810-074-1211	ND
2019-04-10	5810-038-1205	ND
2019-04-11	5810-054-1201	ND
2019-04-17	5810-041-1202	ND
2019-04-17	5810-061-1230	ND
2019-05-14	5810-077-1200	ND
2019-05-15	5810-140-1202	ND
2019-07-02	5810-049-1249	ND
2019-07-22	5810-053-1250	ND
2019-08-27	5810-056-1232	ND
2019-08-27	5810-059-1201	ND
2019-10-14	5810-048-0816	ND
2019-10-29	5810-057-1223	ND