Arsenic
City of Lathrop
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2012 | 5.75 ppb | 36 | 35 | ND - 10.00 ppb |
2013 | 7.06 ppb | 50 | 50 | 5.00 ppb - 8.80 ppb |
2014 | 7.77 ppb | 52 | 52 | 4.40 ppb - 11.0 ppb |
2015 | 7.26 ppb | 52 | 52 | 2.50 ppb - 10.00 ppb |
2016 | 7.66 ppb | 40 | 40 | 6.00 ppb - 9.70 ppb |
2017 | 7.77 ppb | 45 | 45 | 6.20 ppb - 9.10 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.004 ppb
The EWG Health Guideline of 0.004 ppb for arsenic 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.
EPA Maximum Contaminant
Level (MCL) 10 ppb
The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2012-05-01 | 5867-019-1520 | ND |
2012-05-03 | 5867-019-1505 | 2.00 ppb |
2012-05-04 | 5867-019-1512 | 3.00 ppb |
2012-05-07 | 5867-019-1505 | 3.00 ppb |
2012-05-08 | 5867-019-1515 | 3.00 ppb |
2012-05-09 | 5867-019-1525 | 4.00 ppb |
2012-05-10 | 5867-019-1205 | 5.00 ppb |
2012-06-14 | 5867-019-1105 | 6.00 ppb |
2012-06-18 | 5867-019-1025 | 5.00 ppb |
2012-06-20 | 5867-019-0850 | 2.00 ppb |
2012-06-27 | 5867-019-0840 | 2.00 ppb |
2012-07-03 | 5867-019-0900 | 3.00 ppb |
2012-07-11 | 5867-019-0900 | 4.00 ppb |
2012-07-18 | 5867-019-0930 | 9.00 ppb |
2012-07-25 | 5867-019-0845 | 5.00 ppb |
2012-08-01 | 5867-019-0845 | 5.00 ppb |
2012-08-08 | 5867-019-0900 | 5.00 ppb |
2012-08-15 | 5867-019-0840 | 6.00 ppb |
2012-08-22 | 5867-019-0845 | 7.00 ppb |
2012-08-29 | 5867-019-0855 | 7.00 ppb |
2012-09-05 | 5867-019-0900 | 8.00 ppb |
2012-09-12 | 5867-019-0855 | 10.00 ppb |
2012-09-19 | 5867-019-0845 | 9.00 ppb |
2012-09-26 | 5867-019-0920 | 8.00 ppb |
2012-10-03 | 5867-019-0845 | 9.00 ppb |
2012-10-10 | 5867-019-0830 | 9.00 ppb |
2012-10-17 | 5867-019-0830 | 8.00 ppb |
2012-10-24 | 5867-019-1050 | 8.00 ppb |
2012-10-31 | 5867-019-1045 | 6.00 ppb |
2012-11-07 | 5867-019-0935 | 7.00 ppb |
2012-11-14 | 5867-019-0900 | 8.00 ppb |
2012-11-28 | 5867-019-0900 | 7.00 ppb |
2012-12-05 | 5867-019-0852 | 7.00 ppb |
2012-12-12 | 5867-019-0830 | 6.00 ppb |
2012-12-19 | 5867-019-0854 | 6.00 ppb |
2012-12-26 | 5867-019-0830 | 5.00 ppb |
2013-01-02 | 5867-019-0845 | 5.00 ppb |
2013-01-09 | 5867-019-0920 | 6.00 ppb |
2013-01-16 | 5867-019-0832 | 5.00 ppb |
2013-01-23 | 5867-019-0955 | 7.00 ppb |
2013-01-30 | 5867-019-0955 | 7.00 ppb |
2013-02-06 | 5867-019-0937 | 6.00 ppb |
2013-02-13 | 5867-019-0850 | 6.00 ppb |
2013-02-20 | 5867-019-0850 | 6.00 ppb |
2013-02-27 | 5867-019-0900 | 6.00 ppb |
2013-03-06 | 5867-019-0835 | 6.00 ppb |
2013-03-13 | 5867-019-0918 | 6.00 ppb |
2013-03-20 | 5867-019-0855 | 6.00 ppb |
2013-03-27 | 5867-019-0850 | 6.00 ppb |
2013-04-10 | 5867-019-0906 | 6.00 ppb |
2013-04-17 | 5867-019-1045 | 6.00 ppb |
2013-04-24 | 5867-019-1028 | 6.00 ppb |
2013-05-01 | 5867-019-0935 | 6.00 ppb |
2013-05-08 | 5867-019-1025 | 6.00 ppb |
2013-05-15 | 5867-019-0910 | 5.00 ppb |
2013-05-22 | 5867-019-0820 | 6.00 ppb |
2013-05-29 | 5867-019-0834 | 6.00 ppb |
2013-06-05 | 5867-019-0850 | 7.00 ppb |
2013-06-19 | 5867-019-0855 | 6.00 ppb |
2013-06-26 | 5867-019-1030 | 7.00 ppb |
2013-07-03 | 1610-019-1015 | 7.30 ppb |
2013-07-10 | 1610-019-1055 | 7.90 ppb |
2013-07-17 | 1610-019-0813 | 6.60 ppb |
2013-07-24 | 1610-019-0804 | 7.00 ppb |
2013-08-07 | 1610-019-0800 | 7.60 ppb |
2013-08-14 | 1610-019-0758 | 8.50 ppb |
2013-08-21 | 1610-019-0817 | 8.10 ppb |
2013-08-28 | 1610-019-0830 | 7.40 ppb |
2013-09-04 | 1610-019-1005 | 8.10 ppb |
2013-09-11 | 1610-019-0810 | 8.20 ppb |
2013-09-17 | 1610-019-0858 | 8.10 ppb |
2013-09-24 | 1610-019-0900 | 8.10 ppb |
2013-10-01 | 1610-019-0858 | 8.20 ppb |
2013-10-08 | 1610-019-0805 | 7.40 ppb |
2013-10-15 | 1610-019-0800 | 8.30 ppb |
2013-10-22 | 1610-019-0855 | 8.50 ppb |
2013-10-29 | 1610-019-0850 | 8.20 ppb |
2013-11-05 | 1610-019-0800 | 8.40 ppb |
2013-11-12 | 1610-019-0830 | 8.80 ppb |
2013-11-19 | 1610-019-0902 | 8.40 ppb |
2013-11-26 | 1610-019-0812 | 8.70 ppb |
2013-12-03 | 1610-019-0801 | 8.50 ppb |
2013-12-10 | 1610-019-0925 | 8.20 ppb |
2013-12-17 | 1610-019-0912 | 8.70 ppb |
2013-12-24 | 1610-019-0810 | 8.70 ppb |
2013-12-31 | 1610-019-0850 | 5.90 ppb |
2014-01-07 | 1610-019-0800 | 5.90 ppb |
2014-01-14 | 1610-019-0912 | 6.10 ppb |
2014-01-21 | 1610-019-1008 | 8.50 ppb |
2014-01-28 | 1610-019-0945 | 7.40 ppb |
2014-02-04 | 1610-019-0805 | 7.80 ppb |
2014-02-11 | 1610-019-0837 | 7.90 ppb |
2014-02-18 | 1610-019-0912 | 7.90 ppb |
2014-02-25 | 1610-019-0925 | 8.20 ppb |
2014-03-04 | 1610-019-0855 | 8.30 ppb |
2014-03-11 | 1610-019-0935 | 7.60 ppb |
2014-03-18 | 1610-019-0925 | 8.10 ppb |
2014-03-25 | 1610-019-1000 | 8.00 ppb |
2014-04-01 | 1610-019-0845 | 7.40 ppb |
2014-04-08 | 1610-019-0945 | 10.00 ppb |
2014-04-15 | 1610-019-0958 | 7.30 ppb |
2014-04-22 | 1610-019-0955 | 8.10 ppb |
2014-04-29 | 1610-019-0930 | 8.30 ppb |
2014-05-06 | 1610-019-0907 | 8.10 ppb |
2014-05-13 | 1610-019-0913 | 7.80 ppb |
2014-05-20 | 1610-019-0930 | 8.20 ppb |
2014-05-27 | 1610-019-1240 | 8.10 ppb |
2014-06-03 | 1610-019-0803 | 7.00 ppb |
2014-06-10 | 1610-019-0930 | 8.90 ppb |
2014-06-17 | 1610-019-0930 | 7.80 ppb |
2014-06-24 | 1610-019-0850 | 6.80 ppb |
2014-07-01 | 1610-019-0825 | 8.50 ppb |
2014-07-08 | 1610-019-0940 | 7.60 ppb |
2014-07-15 | 1610-019-1025 | 9.10 ppb |
2014-07-22 | 1610-019-1028 | 8.20 ppb |
2014-07-29 | 1610-019-1012 | 7.70 ppb |
2014-08-04 | 1610-019-0900 | 8.20 ppb |
2014-08-12 | 1610-019-0958 | 11.0 ppb |
2014-08-19 | 1610-019-1015 | 9.60 ppb |
2014-08-26 | 1610-019-1008 | 6.10 ppb |
2014-09-02 | 1610-019-0740 | 8.80 ppb |
2014-09-09 | 1610-019-0855 | 4.40 ppb |
2014-09-16 | 1610-019-0920 | 6.10 ppb |
2014-09-23 | 1610-019-1020 | 7.10 ppb |
2014-09-30 | 1610-019-0855 | 5.60 ppb |
2014-10-07 | 1610-019-0823 | 9.20 ppb |
2014-10-14 | 1610-019-1100 | 9.00 ppb |
2014-10-21 | 1610-019-1138 | 7.80 ppb |
2014-10-28 | 1610-019-1045 | 6.90 ppb |
2014-11-04 | 1610-019-0830 | 6.80 ppb |
2014-11-11 | 1610-019-1005 | 8.50 ppb |
2014-11-18 | 1610-019-0955 | 8.00 ppb |
2014-11-25 | 1610-019-0800 | 8.50 ppb |
2014-12-02 | 1610-019-0850 | 6.50 ppb |
2014-12-11 | 1610-019-0910 | 7.30 ppb |
2014-12-16 | 1610-019-1150 | 7.30 ppb |
2014-12-23 | 1610-019-0930 | 7.30 ppb |
2014-12-30 | 1610-019-0920 | 7.60 ppb |
2015-01-06 | 1610-019-0850 | 6.60 ppb |
2015-01-13 | 1610-019-0825 | 2.50 ppb |
2015-01-20 | 1610-019-1002 | 8.50 ppb |
2015-01-27 | 1610-019-1030 | 8.10 ppb |
2015-02-03 | 1610-019-0820 | 6.70 ppb |
2015-02-10 | 1610-019-0900 | 8.40 ppb |
2015-02-17 | 1610-019-1005 | 10.00 ppb |
2015-02-24 | 1610-019-1045 | 8.60 ppb |
2015-03-03 | 1610-019-0840 | 6.30 ppb |
2015-03-10 | 1610-019-0910 | 7.60 ppb |
2015-03-17 | 1610-019-0930 | 6.50 ppb |
2015-03-24 | 1610-019-0900 | 6.50 ppb |
2015-03-31 | 1610-019-1000 | 7.70 ppb |
2015-04-07 | 1610-019-0810 | 6.70 ppb |
2015-04-14 | 1610-019-0915 | 6.60 ppb |
2015-04-21 | 1610-019-1030 | 4.00 ppb |
2015-04-28 | 1610-019-1005 | 6.70 ppb |
2015-05-05 | 1610-019-0855 | 6.90 ppb |
2015-05-12 | 1610-019-0920 | 7.30 ppb |
2015-05-19 | 1610-019-0952 | 6.90 ppb |
2015-05-26 | 1610-019-1040 | 6.40 ppb |
2015-06-02 | 1610-019-0843 | 7.40 ppb |
2015-06-09 | 1610-019-0910 | 6.50 ppb |
2015-06-16 | 1610-019-0950 | 7.40 ppb |
2015-06-23 | 1610-019-1025 | 6.70 ppb |
2015-06-30 | 1610-019-0920 | 7.50 ppb |
2015-07-07 | 9590-019-0835 | 8.40 ppb |
2015-07-14 | 9590-019-0822 | 8.80 ppb |
2015-07-21 | 9590-019-0807 | 8.60 ppb |
2015-07-28 | 9590-019-0800 | 8.50 ppb |
2015-08-04 | 9590-019-0813 | 8.60 ppb |
2015-08-11 | 9590-019-0805 | 8.70 ppb |
2015-08-18 | 9590-019-0813 | 9.70 ppb |
2015-08-25 | 9590-019-0815 | 7.90 ppb |
2015-09-01 | 9590-019-0805 | 7.80 ppb |
2015-09-08 | 9590-019-0827 | 7.70 ppb |
2015-09-15 | 9590-019-0811 | 5.20 ppb |
2015-09-22 | 9590-019-0751 | 7.40 ppb |
2015-09-29 | 9590-019-0749 | 7.40 ppb |
2015-10-06 | 9590-019-0743 | 5.20 ppb |
2015-10-13 | 9590-019-0804 | 7.90 ppb |
2015-10-20 | 9590-019-0758 | 7.10 ppb |
2015-10-27 | 9590-019-0805 | 6.50 ppb |
2015-11-03 | 9590-019-0825 | 8.30 ppb |
2015-11-10 | 9590-019-0805 | 6.80 ppb |
2015-11-17 | 9590-019-0801 | 6.50 ppb |
2015-11-24 | 9590-019-0821 | 7.70 ppb |
2015-12-01 | 9590-019-0825 | 6.80 ppb |
2015-12-08 | 9590-019-0814 | 7.10 ppb |
2015-12-15 | 9590-019-0820 | 6.70 ppb |
2015-12-22 | 9590-019-0843 | 8.00 ppb |
2015-12-29 | 9590-019-0808 | 7.00 ppb |
2016-01-05 | 9590-019-0747 | 7.40 ppb |
2016-01-14 | 9590-019-0844 | 7.80 ppb |
2016-01-21 | 9590-019-0800 | 6.60 ppb |
2016-01-26 | 9590-019-0806 | 6.50 ppb |
2016-02-02 | 9590-019-0750 | 7.50 ppb |
2016-02-09 | 9590-019-0801 | 7.80 ppb |
2016-02-16 | 9590-019-0802 | 7.80 ppb |
2016-03-08 | 9590-019-0733 | 7.90 ppb |
2016-03-15 | 9590-019-0801 | 8.50 ppb |
2016-03-22 | 9590-019-0814 | 7.00 ppb |
2016-03-29 | 9590-019-0752 | 7.90 ppb |
2016-04-05 | 9590-019-0741 | 7.10 ppb |
2016-04-12 | 9590-019-0730 | 6.00 ppb |
2016-04-19 | 9590-019-0740 | 7.10 ppb |
2016-04-26 | 9590-019-1011 | 7.70 ppb |
2016-05-03 | 9590-019-0739 | 8.10 ppb |
2016-05-10 | 9590-019-0737 | 8.70 ppb |
2016-05-17 | 9590-019-0753 | 8.90 ppb |
2016-05-24 | 9590-019-0737 | 9.00 ppb |
2016-05-31 | 9590-019-0714 | 7.20 ppb |
2016-06-28 | 9590-019-0742 | 7.70 ppb |
2016-07-05 | 9590-019-0732 | 7.70 ppb |
2016-07-12 | 9590-019-0900 | 7.60 ppb |
2016-07-19 | 9590-019-0909 | 7.30 ppb |
2016-07-26 | 9590-019-0858 | 8.00 ppb |
2016-08-02 | 9590-019-1013 | 8.10 ppb |
2016-08-09 | 9590-019-0913 | 7.20 ppb |
2016-08-16 | 9590-019-0937 | 7.70 ppb |
2016-08-23 | 9590-019-0923 | 7.80 ppb |
2016-08-30 | 9590-019-0926 | 7.60 ppb |
2016-10-04 | 9590-019-0921 | 7.20 ppb |
2016-10-11 | 9590-019-0918 | 7.00 ppb |
2016-10-18 | 9590-019-0926 | 7.60 ppb |
2016-10-25 | 9590-019-0922 | 7.00 ppb |
2016-11-01 | 9590-019-0908 | 7.50 ppb |
2016-11-08 | 9590-019-0920 | 7.40 ppb |
2016-11-15 | 9590-019-0934 | 7.80 ppb |
2016-11-22 | 9590-019-0924 | 9.70 ppb |
2016-11-29 | 9590-019-0924 | 6.60 ppb |
2016-12-27 | 9590-019-0913 | 9.20 ppb |
2017-01-02 | 9590-019-0922 | 6.20 ppb |
2017-01-09 | 9590-019-0923 | 8.00 ppb |
2017-01-16 | 9590-019-0916 | 7.40 ppb |
2017-01-23 | 9590-019-1000 | 9.00 ppb |
2017-01-30 | 9590-019-0923 | 8.40 ppb |
2017-02-06 | 9590-019-0918 | 7.90 ppb |
2017-02-13 | 9590-019-0854 | 9.10 ppb |
2017-03-06 | 9590-019-0939 | 7.30 ppb |
2017-03-13 | 9590-019-0926 | 8.00 ppb |
2017-03-20 | 9590-019-0940 | 6.90 ppb |
2017-03-27 | 9590-019-0944 | 8.10 ppb |
2017-04-03 | 9590-019-0925 | 6.70 ppb |
2017-04-10 | 9590-019-0936 | 8.00 ppb |
2017-04-17 | 9590-019-0941 | 6.80 ppb |
2017-04-24 | 9590-019-0938 | 9.00 ppb |
2017-05-01 | 9590-019-0919 | 8.00 ppb |
2017-05-08 | 9590-019-0935 | 7.40 ppb |
2017-05-15 | 9590-019-0928 | 7.70 ppb |
2017-05-22 | 9590-019-0937 | 7.40 ppb |
2017-07-03 | 9590-019-0835 | 7.60 ppb |
2017-07-10 | 9590-019-0930 | 7.60 ppb |
2017-07-17 | 9590-019-0946 | 7.40 ppb |
2017-07-24 | 9590-019-0940 | 7.00 ppb |
2017-07-31 | 9590-019-0943 | 6.60 ppb |
2017-08-07 | 9590-019-0909 | 7.20 ppb |
2017-08-14 | 9590-019-0940 | 7.10 ppb |
2017-08-21 | 9590-019-0940 | 7.80 ppb |
2017-08-28 | 9590-019-0940 | 7.80 ppb |
2017-09-07 | 9590-019-0937 | 7.50 ppb |
2017-09-11 | 9590-019-0943 | 7.10 ppb |
2017-09-18 | 9590-019-0937 | 8.60 ppb |
2017-09-25 | 9590-019-0945 | 8.00 ppb |
2017-10-02 | 9590-019-0937 | 8.20 ppb |
2017-10-09 | 9590-019-0940 | 7.90 ppb |
2017-10-16 | 9590-019-0943 | 8.60 ppb |
2017-10-23 | 9590-019-0939 | 8.00 ppb |
2017-10-30 | 9590-019-0930 | 9.00 ppb |
2017-11-06 | 9590-019-0911 | 8.70 ppb |
2017-11-13 | 9590-019-0932 | 6.90 ppb |
2017-11-20 | 9590-019-0938 | 8.00 ppb |
2017-11-27 | 9590-019-0935 | 7.30 ppb |
2017-12-04 | 9590-019-0934 | 8.20 ppb |
2017-12-11 | 9590-019-0933 | 7.60 ppb |
2017-12-18 | 9590-019-0942 | 8.50 ppb |
2017-12-28 | 9590-019-0828 | 8.30 ppb |