Arsenic
Los Angeles Department of Water and Power
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 1.50 ppb | 60 | 26 | ND - 5.40 ppb |
2015 | 1.20 ppb | 60 | 29 | ND - 3.60 ppb |
2016 | 2.93 ppb | 63 | 45 | ND - 7.60 ppb |
2017 | 2.07 ppb | 61 | 36 | ND - 5.70 ppb |
2018 | 1.22 ppb | 55 | 24 | ND - 4.10 ppb |
2019 | 1.24 ppb | 53 | 33 | ND - 2.80 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 |
---|---|---|
2014-01-07 | 1200-011-1025 | 2.20 ppb |
2014-01-14 | 1200-011-1015 | 2.60 ppb |
2014-01-21 | 1200-011-0935 | 2.50 ppb |
2014-01-28 | 1200-011-0845 | 2.50 ppb |
2014-02-04 | 1200-011-0810 | 2.40 ppb |
2014-02-11 | 1200-011-1030 | ND |
2014-02-18 | 1200-011-0830 | 2.10 ppb |
2014-02-25 | 1200-011-0830 | ND |
2014-02-26 | 1200-011-1215 | ND |
2014-02-26 | 1200-133-1215 | ND |
2014-03-04 | 1200-011-0910 | 5.10 ppb |
2014-03-11 | 1200-011-0845 | 4.20 ppb |
2014-03-18 | 1200-011-1035 | 2.10 ppb |
2014-03-27 | 1200-011-0835 | ND |
2014-04-01 | 1200-011-0850 | ND |
2014-04-08 | 1200-011-1015 | 2.40 ppb |
2014-04-15 | 1200-011-1015 | ND |
2014-04-22 | 1200-011-1035 | ND |
2014-04-29 | 1200-011-0940 | 2.20 ppb |
2014-05-06 | 1200-011-1005 | 2.10 ppb |
2014-05-13 | 1200-011-1025 | ND |
2014-05-14 | 1200-011-1115 | ND |
2014-05-14 | 1200-133-1105 | ND |
2014-05-20 | 1200-011-1035 | ND |
2014-05-27 | 1200-011-0955 | ND |
2014-06-03 | 1200-011-0805 | ND |
2014-06-10 | 1200-011-0745 | ND |
2014-06-17 | 1200-011-0840 | ND |
2014-06-24 | 1200-011-0810 | ND |
2014-07-01 | 1200-011-0810 | ND |
2014-07-08 | 1200-011-0825 | 2.10 ppb |
2014-07-15 | 1200-011-0915 | 4.20 ppb |
2014-07-22 | 1200-011-1010 | 4.30 ppb |
2014-07-29 | 1200-011-1045 | 3.90 ppb |
2014-08-05 | 1200-011-1000 | 3.90 ppb |
2014-08-12 | 1200-011-1015 | 4.60 ppb |
2014-08-12 | 1200-011-1030 | 4.60 ppb |
2014-08-19 | 1200-011-1215 | 4.40 ppb |
2014-08-20 | 1200-133-0900 | ND |
2014-08-26 | 1200-011-0720 | 4.50 ppb |
2014-09-02 | 1200-011-0915 | 5.10 ppb |
2014-09-09 | 1200-011-1025 | 5.10 ppb |
2014-09-16 | 1200-011-0750 | 5.40 ppb |
2014-09-23 | 1200-011-0830 | 3.20 ppb |
2014-09-30 | 1200-011-0805 | 2.50 ppb |
2014-10-07 | 1200-011-1045 | ND |
2014-10-14 | 1200-011-1200 | ND |
2014-10-21 | 1200-011-1100 | ND |
2014-10-28 | 1200-011-1100 | ND |
2014-11-04 | 1200-011-1030 | ND |
2014-11-11 | 1200-011-0915 | ND |
2014-11-12 | 1200-011-1240 | ND |
2014-11-18 | 1200-011-1015 | ND |
2014-11-18 | 1200-133-0935 | ND |
2014-11-25 | 1200-011-1050 | ND |
2014-12-02 | 1200-011-1005 | ND |
2014-12-09 | 1200-011-1055 | ND |
2014-12-16 | 1200-011-0815 | ND |
2014-12-23 | 1200-011-1255 | ND |
2014-12-30 | 1200-011-0745 | ND |
2015-01-06 | 1200-011-0750 | ND |
2015-01-13 | 1200-011-0805 | 2.50 ppb |
2015-01-20 | 1200-011-0750 | 3.50 ppb |
2015-01-22 | 1200-205-1125 | 2.50 ppb |
2015-01-27 | 1200-011-0755 | 2.40 ppb |
2015-01-28 | 1200-205-1230 | ND |
2015-02-03 | 1200-011-1120 | ND |
2015-02-04 | 1200-205-1010 | ND |
2015-02-10 | 1200-011-1010 | ND |
2015-02-11 | 1200-133-0825 | ND |
2015-02-11 | 1200-205-1150 | ND |
2015-02-17 | 1200-011-1050 | ND |
2015-02-19 | 1200-011-0845 | ND |
2015-02-24 | 1200-011-1055 | ND |
2015-03-03 | 1200-011-0740 | 2.20 ppb |
2015-03-10 | 1200-011-1120 | ND |
2015-03-17 | 1200-011-0815 | 2.10 ppb |
2015-03-24 | 1200-011-1215 | ND |
2015-03-31 | 1200-011-0810 | ND |
2015-04-07 | 1200-011-1010 | ND |
2015-04-14 | 1200-011-1040 | ND |
2015-04-21 | 1200-011-0950 | ND |
2015-04-28 | 1200-011-1035 | ND |
2015-05-05 | 1200-011-1130 | ND |
2015-05-12 | 1200-011-1125 | ND |
2015-05-19 | 1200-011-0900 | ND |
2015-05-19 | 1200-011-1050 | ND |
2015-05-19 | 1200-133-1100 | ND |
2015-05-26 | 1200-011-1120 | ND |
2015-06-02 | 1200-011-1215 | ND |
2015-06-09 | 1200-011-1115 | ND |
2015-06-16 | 1200-011-1200 | ND |
2015-06-23 | 1200-011-1045 | 2.10 ppb |
2015-06-30 | 1200-011-1105 | ND |
2015-08-04 | 1200-011-1040 | 2.20 ppb |
2015-08-04 | 1200-011-1045 | 2.30 ppb |
2015-08-04 | 1200-133-0645 | ND |
2015-08-11 | 1200-011-1015 | 2.20 ppb |
2015-08-18 | 1200-011-0725 | 2.30 ppb |
2015-08-25 | 1200-011-1040 | 2.90 ppb |
2015-09-01 | 1200-011-1025 | 2.70 ppb |
2015-09-08 | 1200-011-1045 | 2.90 ppb |
2015-09-15 | 1200-011-0800 | 2.40 ppb |
2015-09-22 | 1200-011-1235 | 2.70 ppb |
2015-09-29 | 1200-011-1225 | 2.50 ppb |
2015-10-06 | 1200-011-1140 | 2.10 ppb |
2015-10-13 | 1200-011-1000 | 2.40 ppb |
2015-10-20 | 1200-011-0755 | ND |
2015-10-20 | 1200-205-1155 | ND |
2015-10-27 | 1200-011-0910 | 2.20 ppb |
2015-11-03 | 1200-011-0900 | 2.30 ppb |
2015-11-05 | 1200-011-1005 | 2.30 ppb |
2015-11-05 | 1200-133-0755 | ND |
2015-11-10 | 1200-011-1115 | 2.20 ppb |
2015-11-17 | 1200-011-0950 | 2.10 ppb |
2015-11-24 | 1200-011-0735 | 2.80 ppb |
2015-12-01 | 1200-011-1045 | 2.20 ppb |
2015-12-15 | 1200-011-1140 | 2.50 ppb |
2015-12-22 | 1200-011-1200 | 2.70 ppb |
2015-12-29 | 1200-011-1100 | 3.60 ppb |
2016-01-05 | 1200-011-1145 | 3.60 ppb |
2016-01-12 | 1200-011-1150 | 3.40 ppb |
2016-01-19 | 1200-011-0900 | 3.20 ppb |
2016-01-26 | 1200-011-1105 | 2.30 ppb |
2016-02-02 | 1200-011-1130 | 2.60 ppb |
2016-02-09 | 1200-011-1150 | 2.60 ppb |
2016-02-09 | 1200-133-0930 | ND |
2016-02-16 | 1200-011-0735 | 2.40 ppb |
2016-02-23 | 1200-011-1050 | ND |
2016-02-24 | 1200-011-1215 | ND |
2016-03-01 | 1200-011-1125 | ND |
2016-03-08 | 1200-011-0725 | ND |
2016-03-15 | 1200-011-0940 | 2.00 ppb |
2016-03-22 | 1200-011-1120 | ND |
2016-03-29 | 1200-011-1015 | ND |
2016-04-05 | 1200-011-0955 | 3.30 ppb |
2016-04-12 | 1200-011-0940 | 5.10 ppb |
2016-04-19 | 1200-011-1025 | 2.70 ppb |
2016-04-26 | 1200-011-1020 | 2.50 ppb |
2016-05-03 | 1200-011-1025 | 2.80 ppb |
2016-05-10 | 1200-011-0830 | 2.90 ppb |
2016-05-17 | 1200-011-1205 | 3.00 ppb |
2016-05-24 | 1200-011-1225 | 3.60 ppb |
2016-05-25 | 1200-011-1135 | 3.60 ppb |
2016-05-25 | 1200-133-1210 | ND |
2016-05-31 | 1200-011-1045 | 3.30 ppb |
2016-05-31 | 1200-133-1045 | ND |
2016-06-07 | 1200-011-1230 | 3.90 ppb |
2016-06-14 | 1200-011-1115 | 5.00 ppb |
2016-06-21 | 1200-011-0920 | 5.50 ppb |
2016-06-28 | 1200-011-1300 | 6.60 ppb |
2016-07-05 | 1200-011-0710 | 6.50 ppb |
2016-07-12 | 1200-011-0840 | 7.40 ppb |
2016-07-19 | 1200-011-1130 | 7.60 ppb |
2016-07-21 | 1200-205-1225 | 6.50 ppb |
2016-07-26 | 1200-011-1245 | 5.90 ppb |
2016-07-29 | 1200-205-0740 | 5.90 ppb |
2016-07-30 | 1200-205-0900 | 5.10 ppb |
2016-08-02 | 1200-011-0845 | 5.10 ppb |
2016-08-09 | 1200-011-1210 | 6.00 ppb |
2016-08-16 | 1200-011-0955 | 5.00 ppb |
2016-08-17 | 1200-011-1010 | 4.80 ppb |
2016-08-23 | 1200-011-1045 | 5.40 ppb |
2016-08-23 | 1200-133-1005 | 2.50 ppb |
2016-08-30 | 1200-011-0845 | 4.90 ppb |
2016-09-06 | 1200-011-0930 | 4.80 ppb |
2016-09-13 | 1200-011-0945 | 4.90 ppb |
2016-09-20 | 1200-011-1115 | 4.50 ppb |
2016-09-27 | 1200-011-1120 | 4.70 ppb |
2016-10-04 | 1200-011-0745 | 2.00 ppb |
2016-10-11 | 1200-011-0950 | ND |
2016-10-18 | 1200-011-0935 | ND |
2016-10-25 | 1200-011-1230 | 2.10 ppb |
2016-11-01 | 1200-011-1000 | 2.00 ppb |
2016-11-09 | 1200-011-1035 | 2.00 ppb |
2016-11-15 | 1200-011-1130 | ND |
2016-11-21 | 1200-133-1115 | ND |
2016-11-22 | 1200-011-1215 | ND |
2016-11-29 | 1200-011-0845 | ND |
2016-12-06 | 1200-011-1145 | ND |
2016-12-13 | 1200-011-1200 | ND |
2016-12-20 | 1200-011-1045 | ND |
2016-12-27 | 1200-011-1235 | 2.80 ppb |
2017-01-03 | 1200-011-1325 | 4.20 ppb |
2017-01-10 | 1200-011-1220 | 2.40 ppb |
2017-01-17 | 1200-011-1225 | 2.40 ppb |
2017-01-24 | 1200-011-1240 | ND |
2017-01-31 | 1200-011-1230 | ND |
2017-02-07 | 1200-011-0900 | 2.40 ppb |
2017-02-14 | 1200-011-1140 | 3.80 ppb |
2017-02-21 | 1200-011-1140 | 3.60 ppb |
2017-02-21 | 1200-011-1200 | 3.60 ppb |
2017-02-21 | 1200-133-1210 | 2.60 ppb |
2017-02-28 | 1200-011-1200 | 3.40 ppb |
2017-03-07 | 1200-011-1145 | 3.60 ppb |
2017-03-14 | 1200-011-1134 | 3.80 ppb |
2017-03-21 | 1200-011-1129 | 4.00 ppb |
2017-03-28 | 1200-011-1101 | 5.10 ppb |
2017-04-04 | 1200-011-1118 | 5.70 ppb |
2017-04-11 | 1200-011-1224 | 5.40 ppb |
2017-04-18 | 1200-011-1149 | 5.60 ppb |
2017-04-25 | 1200-011-1219 | 5.00 ppb |
2017-05-02 | 1200-011-0817 | 4.30 ppb |
2017-05-09 | 1200-011-0745 | 4.00 ppb |
2017-05-09 | 1200-011-0940 | 4.00 ppb |
2017-05-16 | 1200-011-1030 | 3.00 ppb |
2017-05-17 | 1200-133-0941 | 3.40 ppb |
2017-05-23 | 1200-011-0744 | 2.70 ppb |
2017-05-30 | 1200-011-0808 | 2.20 ppb |
2017-06-06 | 1200-011-0740 | ND |
2017-06-13 | 1200-011-1057 | 2.20 ppb |
2017-06-20 | 1200-011-1101 | ND |
2017-06-27 | 1200-011-0732 | ND |
2017-07-04 | 1200-011-1044 | ND |
2017-07-11 | 1200-011-0727 | ND |
2017-07-12 | 1200-205-1000 | ND |
2017-07-18 | 1200-011-0739 | ND |
2017-07-25 | 1200-011-1055 | ND |
2017-08-01 | 1200-011-1127 | ND |
2017-08-01 | 1200-133-0940 | ND |
2017-08-08 | 1200-011-1150 | ND |
2017-08-15 | 1200-011-1040 | ND |
2017-08-21 | 1200-011-1010 | ND |
2017-08-22 | 1200-011-1100 | ND |
2017-08-29 | 1200-011-1222 | 2.30 ppb |
2017-09-05 | 1200-011-1312 | 3.10 ppb |
2017-09-12 | 1200-011-1314 | 3.50 ppb |
2017-09-19 | 1200-011-1320 | 3.20 ppb |
2017-09-26 | 1200-011-1322 | 3.70 ppb |
2017-10-03 | 1200-011-1257 | 3.50 ppb |
2017-10-10 | 1200-011-1255 | 4.10 ppb |
2017-10-17 | 1200-011-1306 | 3.60 ppb |
2017-10-24 | 1200-011-0750 | 3.10 ppb |
2017-10-31 | 1200-011-1308 | 2.00 ppb |
2017-11-07 | 1200-011-0959 | ND |
2017-11-14 | 1200-011-1132 | ND |
2017-11-20 | 1200-011-1000 | ND |
2017-11-20 | 1200-133-1040 | 2.00 ppb |
2017-11-21 | 1200-011-1154 | ND |
2017-11-28 | 1200-011-1248 | ND |
2017-12-05 | 1200-011-1227 | ND |
2017-12-12 | 1200-011-0947 | ND |
2017-12-19 | 1200-011-0841 | ND |
2017-12-26 | 1200-011-1224 | ND |
2018-01-02 | 1200-011-1252 | ND |
2018-01-23 | 1200-011-1114 | ND |
2018-01-30 | 1200-011-1116 | ND |
2018-02-06 | 1200-011-1040 | ND |
2018-02-06 | 1200-011-1239 | ND |
2018-02-07 | 1200-133-0930 | ND |
2018-02-13 | 1200-011-1228 | ND |
2018-02-20 | 1200-011-1210 | ND |
2018-02-27 | 1200-011-1248 | ND |
2018-03-06 | 1200-011-1221 | ND |
2018-03-13 | 1200-011-0950 | ND |
2018-03-20 | 1200-011-1245 | ND |
2018-03-27 | 1200-011-1046 | ND |
2018-04-03 | 1200-011-1227 | ND |
2018-04-10 | 1200-011-1107 | ND |
2018-04-17 | 1200-011-1141 | ND |
2018-04-24 | 1200-011-1205 | ND |
2018-05-01 | 1200-011-1131 | ND |
2018-05-08 | 1200-011-1148 | ND |
2018-05-08 | 1200-133-0736 | ND |
2018-05-15 | 1200-011-1126 | ND |
2018-05-22 | 1200-011-0852 | ND |
2018-05-23 | 1200-011-0925 | 2.00 ppb |
2018-05-29 | 1200-011-0725 | 2.00 ppb |
2018-06-05 | 1200-011-0711 | 2.10 ppb |
2018-06-12 | 1200-011-0738 | 2.10 ppb |
2018-06-19 | 1200-011-1226 | 2.50 ppb |
2018-06-26 | 1200-011-1115 | 2.20 ppb |
2018-07-03 | 1200-011-0802 | 2.30 ppb |
2018-07-10 | 1200-011-0800 | 2.50 ppb |
2018-07-17 | 1200-011-0742 | 2.90 ppb |
2018-07-24 | 1200-011-1134 | 3.20 ppb |
2018-07-31 | 1200-011-0744 | 3.60 ppb |
2018-08-07 | 1200-011-0803 | 3.40 ppb |
2018-08-14 | 1200-011-0758 | 3.60 ppb |
2018-08-16 | 1200-011-0940 | 3.40 ppb |
2018-08-16 | 1200-133-0747 | 2.30 ppb |
2018-08-21 | 1200-011-1051 | 3.60 ppb |
2018-08-28 | 1200-011-1253 | 2.90 ppb |
2018-09-04 | 1200-011-1242 | 3.00 ppb |
2018-09-11 | 1200-011-0801 | 2.70 ppb |
2018-09-18 | 1200-011-1139 | 3.50 ppb |
2018-09-25 | 1200-011-0810 | 4.10 ppb |
2018-10-02 | 1200-011-0819 | 2.80 ppb |
2018-10-09 | 1200-011-1019 | ND |
2018-10-16 | 1200-011-0847 | ND |
2018-10-23 | 1200-011-0804 | ND |
2018-10-30 | 1200-011-0807 | ND |
2018-11-06 | 1200-011-0842 | ND |
2018-11-15 | 1200-133-0917 | ND |
2018-12-04 | 1200-011-0952 | ND |
2018-12-04 | 1200-133-0849 | ND |
2018-12-11 | 1200-011-1200 | 2.10 ppb |
2018-12-18 | 1200-011-1309 | 2.20 ppb |
2018-12-25 | 1200-011-1145 | ND |
2019-01-01 | 1200-011-1145 | ND |
2019-01-29 | 1200-011-0852 | ND |
2019-02-05 | 1200-011-0941 | ND |
2019-02-11 | 1200-133-1011 | 1.20 ppb |
2019-02-12 | 1200-011-0853 | ND |
2019-02-13 | 1200-011-1115 | 1.70 ppb |
2019-02-19 | 1200-011-1132 | 2.00 ppb |
2019-02-26 | 1200-011-0749 | ND |
2019-03-05 | 1200-011-0800 | ND |
2019-03-12 | 1200-011-0812 | 2.10 ppb |
2019-03-19 | 1200-011-0800 | ND |
2019-03-26 | 1200-011-0822 | ND |
2019-04-02 | 1200-011-0817 | 2.10 ppb |
2019-04-09 | 1200-011-0827 | 2.40 ppb |
2019-04-16 | 1200-011-1210 | 2.80 ppb |
2019-04-23 | 1200-011-0821 | 2.60 ppb |
2019-04-30 | 1200-011-0953 | 2.80 ppb |
2019-05-07 | 1200-011-1159 | 2.30 ppb |
2019-05-14 | 1200-011-0803 | 2.40 ppb |
2019-05-21 | 1200-011-0807 | 2.00 ppb |
2019-05-21 | 1200-011-1012 | 1.90 ppb |
2019-05-22 | 1200-133-0945 | 2.10 ppb |
2019-05-28 | 1200-011-0743 | ND |
2019-06-04 | 1200-011-0816 | ND |
2019-06-11 | 1200-011-0805 | ND |
2019-06-18 | 1200-011-0856 | ND |
2019-06-25 | 1200-011-0901 | ND |
2019-07-02 | 1200-011-0935 | ND |
2019-07-09 | 1200-011-0812 | ND |
2019-07-16 | 1200-011-0817 | ND |
2019-07-23 | 1200-011-0758 | ND |
2019-07-30 | 1200-011-0807 | ND |
2019-08-06 | 1200-011-0817 | 1.50 ppb |
2019-08-12 | 1200-011-1028 | 1.80 ppb |
2019-08-13 | 1200-011-1134 | 1.80 ppb |
2019-08-13 | 1200-133-0907 | 1.50 ppb |
2019-08-20 | 1200-011-1000 | 1.70 ppb |
2019-08-27 | 1200-011-1150 | 1.90 ppb |
2019-09-03 | 1200-011-1301 | 2.50 ppb |
2019-09-10 | 1200-011-1204 | 2.00 ppb |
2019-09-17 | 1200-011-1249 | 1.80 ppb |
2019-09-24 | 1200-011-1055 | 2.20 ppb |
2019-10-01 | 1200-011-1129 | 2.40 ppb |
2019-10-08 | 1200-011-0754 | 2.60 ppb |
2019-10-15 | 1200-011-1238 | 2.60 ppb |
2019-10-22 | 1200-011-1234 | 2.20 ppb |
2019-10-29 | 1200-011-0821 | 1.80 ppb |
2019-11-05 | 1200-011-1234 | 1.20 ppb |
2019-11-07 | 1200-011-0958 | 1.000 ppb |
2019-11-07 | 1200-133-0852 | 1.50 ppb |
2019-11-12 | 1200-011-0817 | 1.10 ppb |
2019-11-19 | 1200-011-0832 | ND |
2019-11-26 | 1200-011-0840 | ND |