Chromium (total)

California Water Service - Stockton

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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216

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	1.01 ppb	81	53	ND - 7.91 ppb
2015	2.65 ppb	39	25	ND - 13.6 ppb
2016	ND	18	0	ND
2017	ND	45	0	ND
2018	ND	25	0	ND
2019	ND	8	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
2014-01-09	201401100145AM	ND
2014-01-09	201401100106AM	ND
2014-01-09	201401100115AM	0.840 ppb
2014-01-09	201401100156AM	1.20 ppb
2014-01-14	201401150485AM	ND
2014-01-14	201401150331AM	ND
2014-01-14	201401150369AM	1.30 ppb
2014-01-14	201401150353AM	ND
2014-01-14	201401150321AM	0.920 ppb
2014-01-14	201401150648AM	ND
2014-01-16	201401170451AM	ND
2014-01-16	201401170464AM	1.90 ppb
2014-01-16	201401170406AM	1.70 ppb
2014-01-22	201401230166AM	1.10 ppb
2014-02-05	5810-013-1312	ND
2014-04-02	5810-015-1131	ND
2014-04-21	201404220358AM	ND
2014-04-21	201404220289AM	ND
2014-04-21	201404220224AM	ND
2014-04-21	201404220216AM	ND
2014-04-28	5810-013-1211	ND
2014-04-28	5810-050-1115	ND
2014-05-06	5701-131-0943	0.290 ppb
2014-05-07	5810-055-1159	ND
2014-05-27	5701-131-0959	0.319 ppb
2014-05-30	5701-130-1135	2.13 ppb
2014-06-03	5701-130-1121	1.68 ppb
2014-06-03	5810-130-1125	ND
2014-06-03	5701-131-1125	0.800 ppb
2014-06-03	5701-132-1229	3.46 ppb
2014-06-03	5810-132-1252	ND
2014-06-04	5810-058-1024	ND
2014-06-17	5701-131-1613	0.363 ppb
2014-06-23	5701-131-1224	0.547 ppb
2014-06-25	5810-053-1203	ND
2014-07-07	5701-131-1057	0.607 ppb
2014-07-08	201407090776AM	ND
2014-07-08	201407090752AM	1.20 ppb
2014-07-08	201407090755AM	0.260 ppb
2014-07-08	201407090708AM	0.650 ppb
2014-07-08	201407090769AM	ND
2014-07-08	201407090789AM	2.20 ppb
2014-07-14	201407150352AM	4.60 ppb
2014-07-15	5701-131-1030	0.292 ppb
2014-07-23	201407240447AM	ND
2014-07-30	5810-029-1109	ND
2014-08-05	5701-028-1124	1.99 ppb
2014-08-05	5701-045-1345	0.952 ppb
2014-08-05	5701-053-1417	2.01 ppb
2014-08-05	5701-069-1023	0.266 ppb
2014-08-05	5701-130-1110	1.80 ppb
2014-08-12	5701-131-1350	0.328 ppb
2014-08-19	5701-131-1056	0.235 ppb
2014-08-26	5701-131-1018	0.283 ppb
2014-08-27	201408280741AM	2.90 ppb
2014-09-02	5701-131-1150	0.436 ppb
2014-09-10	5701-131-1225	0.443 ppb
2014-09-29	5701-131-1022	0.305 ppb
2014-09-30	5701-132-1148	3.69 ppb
2014-10-07	5701-131-1120	0.521 ppb
2014-10-08	201410090372AM	ND
2014-10-08	201410090297AM	ND
2014-10-08	201410090337AM	ND
2014-10-20	5701-131-0954	0.478 ppb
2014-10-27	5701-131-1210	1.33 ppb
2014-10-28	5701-028-1242	2.25 ppb
2014-10-28	5701-045-1307	1.42 ppb
2014-10-28	5701-053-1330	2.32 ppb
2014-10-28	5701-069-1250	0.938 ppb
2014-11-03	5701-131-0927	0.441 ppb
2014-11-04	5701-028-1344	3.02 ppb
2014-11-04	5701-045-1110	1.21 ppb
2014-11-04	5701-053-1350	2.70 ppb
2014-11-04	5701-069-0930	0.535 ppb
2014-11-04	5701-130-1048	2.83 ppb
2014-11-12	201411130683AM	0.440 ppb
2014-11-18	5810-062-1326	ND
2014-12-30	5701-058-1418	3.20 ppb
2014-12-30	5701-063-0945	3.96 ppb
2014-12-30	5701-064-1155	2.02 ppb
2014-12-30	5701-067-1115	7.91 ppb
2015-01-07	201501080582AM	ND
2015-01-08	201501090540AM	1.20 ppb
2015-01-12	5701-131-1043	0.399 ppb
2015-01-20	5701-131-1031	0.561 ppb
2015-01-22	5701-054-1239	2.20 ppb
2015-01-22	5810-054-1248	ND
2015-01-26	5701-131-1116	0.566 ppb
2015-02-09	5701-131-0923	0.493 ppb
2015-02-17	5701-131-1112	1.43 ppb
2015-03-02	5701-131-1017	1.70 ppb
2015-03-04	5701-045-1208	1.15 ppb
2015-03-04	5701-053-1430	3.73 ppb
2015-03-11	5701-018-1257	13.6 ppb
2015-04-06	5701-131-1021	1.84 ppb
2015-04-07	5701-045-1115	3.61 ppb
2015-04-07	5701-053-1406	6.12 ppb
2015-04-08	5810-051-1231	ND
2015-04-27	5810-050-1210	ND
2015-05-12	5810-018-0655	ND
2015-05-20	5810-007-1145	ND
2015-05-20	5810-028-1020	ND
2015-06-03	5701-045-1139	3.24 ppb
2015-06-03	5701-053-1405	5.94 ppb
2015-07-14	5810-056-1420	ND
2015-07-21	5701-131-1050	2.33 ppb
2015-08-16	1610-133-1900	ND
2015-08-25	5701-028-1030	8.75 ppb
2015-08-25	5701-045-1448	4.88 ppb
2015-08-25	5701-053-1147	8.89 ppb
2015-08-25	5701-069-1022	2.67 ppb
2015-08-25	5701-130-1504	7.25 ppb
2015-08-26	5701-051-1156	8.47 ppb
2015-09-16	201509170573AM	1.30 ppb
2015-10-15	5701-060-1200	ND
2015-10-15	5701-060-1211	ND
2015-10-15	5810-060-1245	ND
2015-11-19	5810-059-1021	ND
2015-12-09	5810-018-0523	ND
2015-12-29	5701-062-0958	11.0 ppb
2016-02-01	5701-131-1117	ND
2016-02-16	5701-131-0930	ND
2016-02-22	5810-052-0736	ND
2016-02-22	5810-067-0916	ND
2016-02-23	5810-061-1150	ND
2016-03-07	5701-131-0920	ND
2016-04-06	5701-061-0953	ND
2016-05-09	5701-131-1113	ND
2016-05-10	5810-045-1040	ND
2016-05-16	5701-131-1012	ND
2016-05-23	5701-131-1133	ND
2016-06-06	5701-131-1005	ND
2016-08-15	5701-131-0954	ND
2016-10-11	5701-131-1125	ND
2016-10-18	5701-028-0953	ND
2016-10-18	5701-045-0933	ND
2016-10-19	5810-064-1200	ND
2016-11-08	5810-063-1145	ND
2017-01-06	5701-045-1150	ND
2017-01-06	5701-053-1120	ND
2017-01-06	5701-061-1045	ND
2017-01-09	5701-131-1040	ND
2017-01-17	5701-131-1035	ND
2017-02-02	5701-051-1120	ND
2017-02-06	5701-069-0935	ND
2017-02-06	5701-131-0945	ND
2017-02-07	5701-045-1128	ND
2017-02-07	5701-053-1313	ND
2017-02-07	5701-059-1359	ND
2017-02-07	5701-060-1427	ND
2017-02-07	5701-130-1023	ND
2017-04-18	5810-015-1348	ND
2017-04-24	5810-007-1010	ND
2017-05-01	5701-069-1247	ND
2017-05-01	5701-131-1302	ND
2017-05-03	5701-007-1516	ND
2017-05-03	5701-051-1306	ND
2017-05-03	5701-055-1427	ND
2017-05-15	5810-055-1508	ND
2017-05-15	5701-131-1055	ND
2017-05-22	5701-131-0850	ND
2017-05-24	5810-018-1052	ND
2017-06-06	5701-045-1415	ND
2017-06-06	5701-053-1300	ND
2017-06-06	5701-130-1510	ND
2017-06-08	5810-058-1152	ND
2017-06-12	5810-132-1026	ND
2017-06-13	5810-053-0930	ND
2017-06-13	5810-130-1250	ND
2017-07-17	5701-131-1324	ND
2017-07-18	5701-028-1322	ND
2017-07-19	5701-045-0935	ND
2017-07-19	5701-053-0925	ND
2017-07-19	5701-061-1039	ND
2017-07-25	5701-015-1155	ND
2017-08-10	5701-052-1114	ND
2017-08-15	5810-029-1255	ND
2017-09-18	5701-131-1152	ND
2017-10-02	5701-131-1340	ND
2017-10-11	5701-062-1230	ND
2017-11-08	5810-062-1455	ND
2017-11-28	5701-131-1248	ND
2017-12-13	5810-050-1050	ND
2018-02-05	5701-069-1450	ND
2018-02-05	5701-131-1500	ND
2018-02-07	5701-045-1035	ND
2018-02-07	5701-053-1410	ND
2018-02-07	5701-059-1230	ND
2018-02-07	5701-060-1130	ND
2018-02-07	5701-130-1510	ND
2018-02-21	5701-050-1215	ND
2018-04-09	5701-131-0925	ND
2018-04-11	5810-051-1335	ND
2018-04-12	5701-133-1005	ND
2018-05-01	5810-054-1330	ND
2018-05-02	5701-045-1345	ND
2018-05-02	5701-053-1255	ND
2018-05-02	5701-059-1045	ND
2018-05-02	5701-060-1000	ND
2018-05-02	5701-130-1435	ND
2018-06-07	5810-059-1340	ND
2018-06-07	5810-060-1250	ND
2018-06-25	5701-131-0930	ND
2018-07-18	5810-056-1225	ND
2018-08-15	5810-133-1335	ND
2018-08-28	5810-028-1130	ND
2018-10-09	5810-028-1205	ND
2018-12-18	5701-131-1335	ND
2019-01-10	5810-061-1020	ND
2019-02-13	5810-052-1252	ND
2019-02-13	5810-067-1349	ND
2019-05-08	5701-051-1155	ND
2019-05-08	5701-059-1441	ND
2019-05-08	5701-060-1440	ND
2019-05-08	5701-130-1333	ND
2019-11-12	5810-063-1115	ND