Arsenic
Azusa Light and Water
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.
257
Samples
0
Samples exceeding legal limit (MCL)
153
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.83 ppb | 8 | 5 | ND - 3.50 ppb |
| 2015 | 2.88 ppb | 44 | 29 | ND - 8.80 ppb |
| 2016 | 2.62 ppb | 55 | 39 | ND - 8.70 ppb |
| 2017 | 2.36 ppb | 55 | 39 | ND - 10.00 ppb |
| 2018 | 2.70 ppb | 45 | 28 | ND - 7.70 ppb |
| 2019 | 2.60 ppb | 50 | 13 | ND - 3.40 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 |
|---|---|---|
| 2014-08-06 | 9588-004-0920 | 2.80 ppb |
| 2014-08-06 | 9588-007-1055 | 3.50 ppb |
| 2014-08-06 | 9588-033-0950 | 2.50 ppb |
| 2014-08-06 | 9588-034-1000 | 2.90 ppb |
| 2014-09-17 | 9588-002-0910 | 2.90 ppb |
| 2014-12-18 | 3761-037-0752 | ND |
| 2014-12-23 | 3761-037-0748 | ND |
| 2014-12-30 | 3761-037-0732 | ND |
| 2015-01-06 | 3761-037-0841 | ND |
| 2015-01-13 | 3761-037-0812 | 2.20 ppb |
| 2015-01-20 | 3761-037-0817 | 2.20 ppb |
| 2015-01-27 | 3761-037-0727 | 2.10 ppb |
| 2015-02-03 | 3761-037-0726 | ND |
| 2015-02-10 | 3761-037-0739 | ND |
| 2015-02-17 | 3761-037-0909 | ND |
| 2015-02-24 | 3761-037-1159 | ND |
| 2015-03-03 | 3761-037-0745 | ND |
| 2015-03-10 | 3761-037-0756 | ND |
| 2015-03-17 | 3761-037-0755 | ND |
| 2015-03-31 | 3761-037-0815 | ND |
| 2015-04-07 | 3761-037-0752 | ND |
| 2015-04-14 | 3761-037-0748 | ND |
| 2015-04-21 | 3761-037-0732 | 2.20 ppb |
| 2015-04-28 | 3761-037-0810 | 2.30 ppb |
| 2015-05-05 | 3761-037-0750 | ND |
| 2015-06-02 | 3761-037-0725 | ND |
| 2015-06-09 | 3761-037-1018 | ND |
| 2015-06-16 | 3761-037-0741 | 2.40 ppb |
| 2015-07-07 | 3761-037-0946 | 3.10 ppb |
| 2015-08-04 | 3761-037-0812 | 3.90 ppb |
| 2015-08-05 | 9588-003-0850 | 2.90 ppb |
| 2015-08-11 | 3761-037-0952 | 7.70 ppb |
| 2015-08-18 | 3761-037-0726 | 8.80 ppb |
| 2015-08-25 | 3761-037-0751 | 6.50 ppb |
| 2015-09-01 | 3761-037-0739 | 5.50 ppb |
| 2015-09-08 | 3761-037-0815 | 5.50 ppb |
| 2015-09-15 | 3761-037-0754 | 5.80 ppb |
| 2015-09-22 | 3761-037-0711 | 4.70 ppb |
| 2015-09-29 | 3761-037-0813 | 6.20 ppb |
| 2015-10-06 | 3761-037-0752 | 7.60 ppb |
| 2015-10-13 | 3761-037-1008 | 4.40 ppb |
| 2015-10-20 | 3761-037-0732 | 6.40 ppb |
| 2015-10-27 | 3761-037-0745 | 4.30 ppb |
| 2015-11-03 | 3761-037-0801 | 5.50 ppb |
| 2015-11-04 | 9588-010-1030 | ND |
| 2015-11-10 | 3761-037-0801 | 5.80 ppb |
| 2015-11-17 | 3761-037-0705 | 5.80 ppb |
| 2015-11-24 | 3761-037-0746 | 3.00 ppb |
| 2015-12-01 | 3761-037-0908 | 2.40 ppb |
| 2015-12-08 | 3761-037-0722 | 2.10 ppb |
| 2015-12-15 | 3761-037-0816 | 2.70 ppb |
| 2015-12-29 | 3761-037-0822 | 2.80 ppb |
| 2016-01-04 | 3761-037-1121 | 2.50 ppb |
| 2016-01-12 | 3761-037-0736 | 2.40 ppb |
| 2016-01-19 | 3761-037-0806 | 2.60 ppb |
| 2016-01-26 | 3761-037-0703 | 3.50 ppb |
| 2016-02-02 | 3761-037-0826 | 4.00 ppb |
| 2016-02-09 | 3761-037-0758 | 3.30 ppb |
| 2016-02-16 | 3761-037-0818 | 3.50 ppb |
| 2016-02-23 | 3761-037-0745 | 3.50 ppb |
| 2016-03-01 | 3761-037-0746 | 3.10 ppb |
| 2016-03-09 | 3761-037-1147 | 2.20 ppb |
| 2016-03-15 | 3761-037-0738 | ND |
| 2016-03-22 | 3761-037-0749 | 2.00 ppb |
| 2016-03-29 | 3761-037-0750 | ND |
| 2016-04-05 | 3761-037-0808 | ND |
| 2016-04-12 | 3761-037-0802 | 3.30 ppb |
| 2016-04-26 | 3761-037-1107 | 3.60 ppb |
| 2016-05-03 | 3761-037-0810 | 3.10 ppb |
| 2016-05-10 | 3761-037-0740 | 3.10 ppb |
| 2016-05-17 | 3761-037-0741 | 3.60 ppb |
| 2016-05-24 | 3761-037-0757 | 2.70 ppb |
| 2016-05-31 | 3761-037-0731 | 3.60 ppb |
| 2016-06-07 | 3761-037-0740 | 7.00 ppb |
| 2016-06-14 | 3761-037-0756 | 5.20 ppb |
| 2016-06-21 | 3761-037-0729 | 6.60 ppb |
| 2016-06-28 | 3761-037-0732 | 7.50 ppb |
| 2016-07-05 | 3761-037-0801 | 5.50 ppb |
| 2016-07-12 | 3761-037-0806 | ND |
| 2016-07-19 | 3761-037-0816 | ND |
| 2016-07-26 | 3761-037-0809 | ND |
| 2016-08-02 | 3761-037-0745 | 2.50 ppb |
| 2016-08-09 | 9588-001-0900 | 2.30 ppb |
| 2016-08-09 | 9588-005-0940 | ND |
| 2016-08-09 | 9588-006-1010 | ND |
| 2016-08-09 | 9588-008-0950 | 2.40 ppb |
| 2016-08-09 | 3761-037-0800 | 3.10 ppb |
| 2016-08-16 | 3761-037-0816 | 2.70 ppb |
| 2016-08-23 | 3761-037-0745 | ND |
| 2016-08-30 | 3761-037-0813 | ND |
| 2016-09-06 | 3761-037-0746 | 2.20 ppb |
| 2016-09-13 | 3761-037-0739 | ND |
| 2016-09-20 | 3761-037-0742 | 2.70 ppb |
| 2016-09-27 | 3761-037-0830 | ND |
| 2016-10-04 | 3761-037-0751 | ND |
| 2016-10-11 | 3761-037-1107 | ND |
| 2016-10-18 | 3761-037-0747 | 5.00 ppb |
| 2016-10-25 | 3761-037-0735 | 5.50 ppb |
| 2016-11-01 | 3761-037-0811 | ND |
| 2016-11-08 | 3761-037-0821 | 2.00 ppb |
| 2016-11-15 | 3761-037-0802 | 8.70 ppb |
| 2016-11-22 | 3761-037-1022 | 3.40 ppb |
| 2016-11-29 | 3761-037-0752 | ND |
| 2016-12-06 | 3761-037-0803 | 2.30 ppb |
| 2016-12-13 | 3761-037-0738 | 2.20 ppb |
| 2016-12-20 | 3761-037-0751 | 6.50 ppb |
| 2016-12-28 | 3761-037-0755 | 3.00 ppb |
| 2017-01-03 | 3761-037-0752 | 2.10 ppb |
| 2017-01-10 | 3761-037-0757 | ND |
| 2017-01-17 | 3761-037-0747 | ND |
| 2017-01-31 | 3761-037-0808 | 3.40 ppb |
| 2017-02-07 | 3761-037-0736 | 4.10 ppb |
| 2017-02-14 | 3761-037-0806 | 4.20 ppb |
| 2017-02-21 | 3761-037-0753 | 2.20 ppb |
| 2017-02-28 | 3761-037-0757 | ND |
| 2017-03-07 | 3761-037-0905 | 2.20 ppb |
| 2017-03-14 | 3761-037-0751 | ND |
| 2017-03-21 | 3761-037-0805 | 2.30 ppb |
| 2017-03-28 | 3761-037-0802 | 3.40 ppb |
| 2017-04-04 | 3761-037-0752 | 4.10 ppb |
| 2017-04-11 | 3761-037-0815 | 4.30 ppb |
| 2017-04-18 | 3761-037-0832 | 4.30 ppb |
| 2017-04-25 | 3761-037-0810 | 2.70 ppb |
| 2017-05-02 | 3761-037-0803 | 2.60 ppb |
| 2017-05-09 | 3761-037-0820 | 4.10 ppb |
| 2017-05-16 | 3761-037-0812 | 5.20 ppb |
| 2017-05-23 | 3761-037-0751 | 2.80 ppb |
| 2017-05-30 | 3761-037-0804 | 2.60 ppb |
| 2017-06-06 | 3761-037-0823 | 2.80 ppb |
| 2017-06-20 | 3761-037-0936 | 2.40 ppb |
| 2017-06-27 | 3761-037-0752 | 2.40 ppb |
| 2017-07-05 | 3761-037-0745 | 2.90 ppb |
| 2017-07-11 | 3761-037-0837 | 2.90 ppb |
| 2017-07-18 | 3761-037-0805 | 2.20 ppb |
| 2017-07-25 | 3761-037-0811 | 2.50 ppb |
| 2017-08-01 | 3761-037-0923 | 3.00 ppb |
| 2017-08-08 | 3761-037-0817 | ND |
| 2017-08-14 | 9588-002-0825 | 4.10 ppb |
| 2017-08-14 | 9588-004-0850 | 4.50 ppb |
| 2017-08-14 | 9588-007-0910 | 2.20 ppb |
| 2017-08-14 | 9588-033-0830 | 2.80 ppb |
| 2017-08-14 | 9588-034-0835 | 2.90 ppb |
| 2017-08-15 | 3761-037-0832 | ND |
| 2017-08-22 | 3761-037-0835 | ND |
| 2017-08-29 | 3761-037-0821 | ND |
| 2017-09-05 | 3761-037-1116 | ND |
| 2017-09-12 | 3761-037-0850 | ND |
| 2017-09-18 | 3761-037-0829 | ND |
| 2017-09-26 | 3761-037-0731 | ND |
| 2017-10-03 | 3761-037-0805 | 10.00 ppb |
| 2017-10-10 | 3761-037-0748 | ND |
| 2017-10-17 | 3761-037-1120 | ND |
| 2017-10-24 | 3761-037-0800 | ND |
| 2017-10-31 | 3761-037-0746 | ND |
| 2017-11-07 | 3761-037-0710 | 3.50 ppb |
| 2017-11-14 | 3761-037-0731 | 2.20 ppb |
| 2017-11-21 | 3761-037-0753 | 2.50 ppb |
| 2017-11-28 | 3761-037-0735 | 3.20 ppb |
| 2017-12-05 | 3761-037-0739 | 3.40 ppb |
| 2017-12-12 | 3761-037-0742 | 4.80 ppb |
| 2017-12-19 | 3761-037-0813 | 3.10 ppb |
| 2017-12-26 | 3761-037-0822 | 2.70 ppb |
| 2018-01-02 | 3761-037-0814 | ND |
| 2018-01-09 | 3761-037-0738 | 2.20 ppb |
| 2018-01-16 | 3761-037-0811 | ND |
| 2018-01-23 | 3761-037-0718 | ND |
| 2018-01-30 | 3761-037-0734 | ND |
| 2018-02-06 | 3761-037-0734 | 3.00 ppb |
| 2018-02-13 | 3761-037-0732 | 2.40 ppb |
| 2018-02-20 | 3761-037-0816 | ND |
| 2018-02-27 | 3761-037-0732 | ND |
| 2018-03-06 | 3761-037-0719 | 2.70 ppb |
| 2018-03-13 | 3761-037-0814 | 2.30 ppb |
| 2018-03-20 | 3761-037-0730 | ND |
| 2018-03-27 | 3761-037-0753 | ND |
| 2018-04-03 | 3761-037-0726 | 2.60 ppb |
| 2018-04-10 | 3761-037-0828 | ND |
| 2018-04-17 | 3761-037-0731 | ND |
| 2018-04-24 | 3761-037-0832 | 2.20 ppb |
| 2018-05-01 | 3761-037-0717 | 3.60 ppb |
| 2018-05-08 | 3761-037-0728 | 3.60 ppb |
| 2018-05-15 | 3761-037-0721 | 2.00 ppb |
| 2018-05-22 | 3761-037-0712 | 3.20 ppb |
| 2018-05-29 | 3761-037-0708 | 3.40 ppb |
| 2018-06-01 | 2.70 ppb* | |
| 2018-06-05 | 3761-037-0726 | 3.00 ppb |
| 2018-06-12 | 3761-037-0727 | 3.50 ppb |
| 2018-06-19 | 3761-037-0742 | 3.30 ppb |
| 2018-06-26 | 3761-037-0757 | 4.00 ppb |
| 2018-07-02 | 3761-037-0758 | 4.00 ppb |
| 2018-07-10 | 3761-037-0830 | 3.10 ppb |
| 2018-08-08 | 9588-003-0825 | 3.50 ppb |
| 2018-09-11 | 3761-037-0711 | 4.40 ppb |
| 2018-09-25 | 3761-037-0800 | 7.70 ppb |
| 2018-10-02 | 3761-037-0746 | 6.00 ppb |
| 2018-10-09 | 3761-037-0817 | 5.60 ppb |
| 2018-10-16 | 3761-037-0807 | 5.40 ppb |
| 2018-10-23 | 3761-037-0754 | 4.00 ppb |
| 2018-11-06 | 9588-010-1120 | ND |
| 2018-11-06 | 3761-037-0842 | 3.90 ppb |
| 2018-11-13 | 3761-037-0751 | 3.90 ppb |
| 2018-11-20 | 3761-037-0753 | ND |
| 2018-11-27 | 3761-037-0823 | ND |
| 2018-12-04 | 3761-037-0805 | ND |
| 2018-12-11 | 3761-037-0807 | ND |
| 2018-12-18 | 3761-037-0742 | ND |
| 2018-12-26 | 3761-037-0747 | ND |
| 2019-01-02 | 3761-037-0820 | 3.10 ppb |
| 2019-01-08 | 3761-037-0730 | 3.10 ppb |
| 2019-01-14 | 3761-037-0824 | 2.90 ppb |
| 2019-02-28 | 3761-037-1102 | ND |
| 2019-03-19 | 3761-037-0755 | ND |
| 2019-03-26 | 3761-037-0859 | ND |
| 2019-04-02 | 3761-037-0912 | ND |
| 2019-04-09 | 3761-037-0745 | ND |
| 2019-04-16 | 3761-037-0720 | ND |
| 2019-04-23 | 3761-037-0735 | ND |
| 2019-04-30 | 3761-037-0800 | ND |
| 2019-05-07 | 3761-037-0817 | ND |
| 2019-05-14 | 3761-037-0758 | 2.20 ppb |
| 2019-05-21 | 3761-037-0802 | 2.00 ppb |
| 2019-05-28 | 3761-037-0716 | 2.20 ppb |
| 2019-06-01 | 2.60 ppb* | |
| 2019-06-04 | 3761-037-0724 | ND |
| 2019-06-11 | 3761-037-0727 | 2.10 ppb |
| 2019-06-18 | 3761-037-0842 | 2.50 ppb |
| 2019-06-25 | 3761-037-0758 | 2.10 ppb |
| 2019-07-02 | 3761-037-0800 | ND |
| 2019-07-09 | 3761-037-0745 | ND |
| 2019-07-16 | 3761-037-0700 | ND |
| 2019-07-23 | 3761-037-0754 | ND |
| 2019-07-30 | 3761-037-0756 | ND |
| 2019-08-06 | 3761-037-0750 | ND |
| 2019-08-13 | 3761-037-0814 | ND |
| 2019-08-19 | 9588-001-0930 | 2.30 ppb |
| 2019-08-19 | 9588-005-0955 | ND |
| 2019-08-19 | 9588-006-1010 | ND |
| 2019-08-19 | 9588-008-1030 | ND |
| 2019-08-20 | 3761-037-0811 | ND |
| 2019-08-27 | 3761-037-0743 | ND |
| 2019-09-03 | 3761-037-0818 | ND |
| 2019-09-11 | 3761-037-0751 | ND |
| 2019-09-17 | 3761-037-0802 | ND |
| 2019-09-25 | 3761-037-0757 | ND |
| 2019-10-01 | 3761-037-0824 | ND |
| 2019-10-08 | 3761-037-0757 | ND |
| 2019-10-15 | 3761-037-0810 | ND |
| 2019-10-22 | 3761-037-0748 | 2.00 ppb |
| 2019-10-29 | 3761-037-0726 | 2.10 ppb |
| 2019-11-12 | 3761-037-0808 | ND |
| 2019-11-19 | 3761-037-0745 | ND |
| 2019-11-26 | 3761-037-0716 | ND |
| 2019-12-03 | 3761-037-0740 | ND |
| 2019-12-10 | 3761-037-0716 | ND |
| 2019-12-17 | 3761-037-0726 | ND |
| 2019-12-24 | 3761-037-0813 | ND |
| 2019-12-31 | 3761-037-0748 | ND |
* Sample result is taken from the system's CCR report.