Chromium (total)
Rancho California Water District
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.
198
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.837 ppb | 51 | 30 | ND - 3.70 ppb |
| 2015 | 0.496 ppb | 71 | 30 | ND - 3.60 ppb |
| 2016 | 0.320 ppb | 10 | 2 | ND - 1.80 ppb |
| 2017 | 0.700 ppb | 23 | 6 | ND - 4.10 ppb |
| 2018 | 0.613 ppb | 31 | 8 | ND - 4.20 ppb |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-01-16 | 4790-090-1039 | ND |
| 2014-04-02 | 4790-084-1000 | ND |
| 2014-04-02 | 4790-085-1030 | ND |
| 2014-04-02 | 4790-086-1100 | ND |
| 2014-04-03 | 4790-043-1015 | ND |
| 2014-04-09 | 4790-042-1122 | ND |
| 2014-05-28 | 4790-143-0930 | ND |
| 2014-06-03 | 4790-025-0855 | 1.10 ppb |
| 2014-07-10 | 4790-024-0840 | 3.40 ppb |
| 2014-08-06 | 4790-143-0905 | ND |
| 2014-08-07 | 4790-040-1010 | 3.10 ppb |
| 2014-08-07 | 4790-095-0905 | ND |
| 2014-09-04 | 4790-059-0935 | 2.70 ppb |
| 2014-10-02 | 4790-029-0940 | ND |
| 2014-10-02 | 4790-041-1018 | 2.70 ppb |
| 2014-10-06 | B4J0481-01 | ND |
| 2014-10-06 | B4J0481-06 | 0.370 ppb |
| 2014-10-06 | B4J0481-04 | 1.80 ppb |
| 2014-10-06 | B4J0481-08 | 0.740 ppb |
| 2014-10-06 | B4J0481-10 | 0.900 ppb |
| 2014-10-07 | B4J0640-01 | 0.860 ppb |
| 2014-10-07 | B4J0640-13 | ND |
| 2014-10-07 | B4J0640-04 | ND |
| 2014-10-07 | B4J0640-10 | 2.80 ppb |
| 2014-10-07 | B4J0640-07 | 2.20 ppb |
| 2014-10-08 | B4J0845-13 | 3.70 ppb |
| 2014-10-08 | B4J0845-01 | 2.90 ppb |
| 2014-10-08 | B4J0845-04 | 0.420 ppb |
| 2014-10-08 | B4J0845-16 | 0.200 ppb |
| 2014-10-08 | B4J0845-07 | ND |
| 2014-10-08 | B4J0845-10 | 2.30 ppb |
| 2014-10-08 | B4J0845-19 | 1.10 ppb |
| 2014-10-09 | 4790-047-1000 | ND |
| 2014-10-13 | B4J1329-07 | 1.20 ppb |
| 2014-10-13 | B4J1329-16 | ND |
| 2014-10-13 | B4J1329-25 | 1.20 ppb |
| 2014-10-13 | B4J1329-10 | 0.880 ppb |
| 2014-10-13 | B4J1329-01 | ND |
| 2014-10-13 | B4J1329-19 | 0.660 ppb |
| 2014-10-13 | B4J1329-04 | 0.590 ppb |
| 2014-10-13 | B4J1329-13 | 0.510 ppb |
| 2014-10-13 | B4J1329-22 | 0.280 ppb |
| 2014-10-14 | B4J1493-13 | ND |
| 2014-10-14 | B4J1493-07 | 0.700 ppb |
| 2014-10-14 | B4J1493-10 | ND |
| 2014-10-14 | B4J1493-01 | ND |
| 2014-10-14 | B4J1493-04 | 0.320 ppb |
| 2014-10-15 | B4J1671-01 | ND |
| 2014-11-04 | B4K0339-01 | 0.350 ppb |
| 2014-11-14 | B4K1419-01 | 1.60 ppb |
| 2014-12-09 | 4790-019-1000 | 1.10 ppb |
| 2015-01-15 | B5A1539-01 | ND |
| 2015-01-15 | B5A1539-04 | 0.220 ppb |
| 2015-01-15 | B5A1539-06 | ND |
| 2015-01-29 | 4790-142-1030 | ND |
| 2015-02-03 | B5B0305-01 | ND |
| 2015-02-20 | 4790-034-0945 | ND |
| 2015-03-05 | 4790-028-0932 | ND |
| 2015-03-11 | 4790-048-1048 | ND |
| 2015-03-30 | B5C2852-04 | 0.460 ppb |
| 2015-03-30 | B5C2852-01 | ND |
| 2015-04-02 | B5D0198-01 | ND |
| 2015-04-02 | B5D0198-04 | ND |
| 2015-04-02 | B5D0201-07 | ND |
| 2015-04-02 | B5D0201-05 | 2.40 ppb |
| 2015-04-02 | B5D0201-09 | 0.360 ppb |
| 2015-04-02 | B5D0201-03 | ND |
| 2015-04-02 | B5D0198-09 | 0.870 ppb |
| 2015-04-02 | B5D0198-07 | 0.220 ppb |
| 2015-04-02 | B5D0201-01 | 0.730 ppb |
| 2015-04-02 | B5D0201-11 | 1.20 ppb |
| 2015-04-08 | 4790-046-0858 | ND |
| 2015-04-13 | B5D1204-16 | ND |
| 2015-04-13 | B5D1204-01 | 3.60 ppb |
| 2015-04-13 | B5D1204-04 | 1.60 ppb |
| 2015-04-13 | B5D1204-07 | 1.60 ppb |
| 2015-04-13 | B5D1204-10 | 1.10 ppb |
| 2015-04-13 | B5D1204-22 | ND |
| 2015-04-13 | B5D1204-19 | ND |
| 2015-04-13 | B5D1204-13 | 1.70 ppb |
| 2015-04-14 | B5D1346-01 | 1.000 ppb |
| 2015-04-14 | B5D1346-04 | ND |
| 2015-04-15 | B5D1533-16 | ND |
| 2015-04-15 | B5D1533-31 | 1.40 ppb |
| 2015-04-15 | B5D1533-07 | 0.640 ppb |
| 2015-04-15 | B5D1533-34 | 0.950 ppb |
| 2015-04-15 | B5D1533-04 | ND |
| 2015-04-15 | B5D1533-22 | ND |
| 2015-04-15 | B5D1533-25 | 0.290 ppb |
| 2015-04-15 | B5D1533-28 | 0.560 ppb |
| 2015-04-15 | B5D1533-13 | 0.950 ppb |
| 2015-04-15 | B5D1533-01 | 0.510 ppb |
| 2015-04-15 | B5D1533-10 | 0.270 ppb |
| 2015-04-15 | B5D1533-19 | ND |
| 2015-04-16 | 4790-017-1030 | ND |
| 2015-04-21 | 4790-018-0930 | ND |
| 2015-04-22 | 4790-053-1200 | 2.30 ppb |
| 2015-04-22 | 4790-142-1015 | ND |
| 2015-04-29 | B5D2887-04 | 2.20 ppb |
| 2015-04-29 | B5D2887-01 | ND |
| 2015-05-06 | 4790-143-1050 | ND |
| 2015-05-14 | 4790-097-1145 | ND |
| 2015-06-02 | 4790-045-1202 | ND |
| 2015-06-02 | 4790-051-1122 | ND |
| 2015-07-07 | 4790-015-1000 | 2.00 ppb |
| 2015-07-14 | 4790-142-0000 | ND |
| 2015-07-21 | B5G2279-01 | ND |
| 2015-07-21 | B5G2279-04 | ND |
| 2015-07-21 | B5G2279-07 | 0.580 ppb |
| 2015-07-21 | B5G2279-09 | 0.390 ppb |
| 2015-08-05 | 4790-143-1135 | ND |
| 2015-08-07 | 4790-027-0840 | 2.70 ppb |
| 2015-08-20 | B5H2092-04 | 0.530 ppb |
| 2015-08-20 | B5H2092-01 | ND |
| 2015-09-09 | 4790-058-1017 | ND |
| 2015-09-10 | 4790-071-1113 | ND |
| 2015-10-06 | 4790-065-1045 | 1.90 ppb |
| 2015-10-14 | 4790-142-1045 | ND |
| 2015-11-04 | 4790-035-1240 | ND |
| 2015-11-04 | 4790-143-0955 | ND |
| 2015-12-09 | 4790-038-0955 | ND |
| 2015-12-09 | 4790-046-0925 | ND |
| 2016-01-13 | 4790-044-0900 | 1.40 ppb |
| 2016-01-20 | 4790-142-1030 | ND |
| 2016-02-29 | 4790-150-1830 | ND |
| 2016-03-15 | 4790-037-1200 | ND |
| 2016-04-14 | 4790-142-1100 | ND |
| 2016-05-11 | 4790-036-1230 | ND |
| 2016-07-06 | 4790-031-1115 | ND |
| 2016-07-25 | 4790-012-1230 | 1.80 ppb |
| 2016-07-27 | 4790-142-1130 | ND |
| 2016-11-09 | 4790-153-1110 | ND |
| 2017-01-18 | 4790-090-1120 | ND |
| 2017-02-03 | 4790-153-1050 | ND |
| 2017-03-23 | 4790-142-1055 | ND |
| 2017-04-11 | 4790-042-1045 | ND |
| 2017-04-11 | 4790-043-1000 | ND |
| 2017-04-11 | 4790-084-0940 | ND |
| 2017-04-11 | 4790-085-1040 | ND |
| 2017-04-12 | 4790-142-1030 | ND |
| 2017-04-27 | 4790-086-1025 | ND |
| 2017-05-04 | 4790-153-1010 | ND |
| 2017-06-07 | 4790-025-0920 | 1.30 ppb |
| 2017-07-11 | 4790-024-0945 | 4.10 ppb |
| 2017-07-13 | 4790-142-1035 | ND |
| 2017-08-04 | 4790-040-0845 | 3.50 ppb |
| 2017-08-09 | 4790-095-1000 | ND |
| 2017-08-10 | 4790-153-1215 | ND |
| 2017-09-01 | 4790-150-0930 | ND |
| 2017-09-28 | 4790-059-0943 | 2.30 ppb |
| 2017-10-11 | 4790-041-1107 | 2.90 ppb |
| 2017-10-17 | 4790-029-1101 | ND |
| 2017-11-08 | 4790-150-1445 | ND |
| 2017-11-22 | 4790-151-1100 | ND |
| 2017-12-13 | 4790-019-1038 | 2.00 ppb |
| 2018-01-04 | 4790-142-1242 | ND |
| 2018-02-07 | 4790-034-0923 | ND |
| 2018-02-07 | 4790-150-1242 | ND |
| 2018-02-07 | 4790-151-1148 | ND |
| 2018-03-07 | 4790-035-1050 | ND |
| 2018-03-15 | 4790-018-1125 | ND |
| 2018-03-15 | 4790-048-1057 | ND |
| 2018-04-13 | 4790-017-1000 | ND |
| 2018-04-13 | 4790-053-1205 | 3.40 ppb |
| 2018-04-25 | 4790-152-1135 | 4.20 ppb |
| 2018-05-03 | 4790-051-1020 | ND |
| 2018-05-03 | 4790-150-1130 | ND |
| 2018-05-03 | 4790-151-1235 | ND |
| 2018-05-18 | 4790-097-0918 | ND |
| 2018-05-23 | 4790-047-1004 | ND |
| 2018-06-07 | 4790-045-1100 | ND |
| 2018-07-17 | 4790-152-1045 | 1.20 ppb |
| 2018-07-18 | 4790-015-0901 | 2.30 ppb |
| 2018-08-09 | 4790-151-1000 | ND |
| 2018-08-14 | 4790-150-0914 | ND |
| 2018-08-15 | 4790-027-1029 | 2.90 ppb |
| 2018-09-11 | 4790-071-0855 | 1.60 ppb |
| 2018-09-13 | 4790-051-1035 | ND |
| 2018-10-03 | 4790-152-1030 | ND |
| 2018-10-16 | 4790-065-0900 | 1.50 ppb |
| 2018-10-17 | 4790-155-1240 | 1.90 ppb |
| 2018-11-06 | 4790-150-0957 | ND |
| 2018-11-06 | 4790-151-1116 | ND |
| 2018-11-27 | 4790-143-0946 | ND |
| 2018-12-14 | 4790-038-0815 | ND |
| 2018-12-17 | 4790-046-1210 | ND |
| 2019-01-09 | 4790-152-1100 | ND |
| 2019-01-09 | 4790-155-0930 | ND |
| 2019-02-12 | 4790-153-1201 | ND |
| 2019-02-19 | 4790-150-0958 | ND |
| 2019-02-19 | 4790-151-0841 | ND |
| 2019-03-26 | 4790-037-0950 | ND |
| 2019-04-02 | 4790-155-1115 | ND |
| 2019-05-01 | 4790-036-1015 | ND |
| 2019-05-07 | 4790-012-0831 | ND |
| 2019-05-15 | 4790-044-0955 | ND |
| 2019-07-01 | 4790-031-1052 | ND |
| 2019-07-22 | 4790-155-0820 | ND |