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).
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 |