Arsenic
Norman
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.
187
Samples
10
Samples exceeding legal limit (MCL)
161
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 | 4.13 ppb | 31 | 30 | ND - 11.1 ppb |
| 2015 | 4.27 ppb | 71 | 65 | ND - 21.2 ppb |
| 2016 | 3.07 ppb | 31 | 29 | ND - 8.75 ppb |
| 2017 | 2.05 ppb | 30 | 25 | ND - 6.22 ppb |
| 2018 | 2.20 ppb | 10 | 5 | ND - 9.38 ppb |
| 2019 | 1.28 ppb | 14 | 7 | ND - 5.90 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 |
|---|---|---|
| 2014-01-08 | 1268268 | 1.46 ppb |
| 2014-02-05 | 1276073 | ND |
| 2014-02-05 | 1276074 | 0.870 ppb |
| 2014-02-05 | 1276075 | 3.27 ppb |
| 2014-02-05 | 1276079 | 3.90 ppb |
| 2014-02-05 | 1276081 | 5.10 ppb |
| 2014-02-10 | 1276906 | 0.797 ppb |
| 2014-02-10 | 1276908 | 2.22 ppb |
| 2014-02-10 | 1276909 | 2.13 ppb |
| 2014-02-13 | 1277685 | 0.892 ppb |
| 2014-02-19 | 1279436 | 5.35 ppb |
| 2014-02-19 | 1279437 | 11.1 ppb |
| 2014-03-06 | 1283301 | 4.49 ppb |
| 2014-03-06 | 1283302 | 1.57 ppb |
| 2014-03-27 | 1288653 | 0.973 ppb |
| 2014-04-10 | 1292984 | 9.59 ppb |
| 2014-04-10 | 1292987 | 1.85 ppb |
| 2014-05-07 | 1300196 | 9.22 ppb |
| 2014-05-07 | 1300197 | 5.33 ppb |
| 2014-05-14 | 1301560 | 0.930 ppb |
| 2014-05-14 | 1301562 | 6.13 ppb |
| 2014-05-14 | 1301563 | 1.34 ppb |
| 2014-07-23 | 1320263 | 11.0 ppb |
| 2014-09-24 | 1337751 | 1.01 ppb |
| 2014-09-24 | 1337752 | 6.07 ppb |
| 2014-09-24 | 1337759 | 4.97 ppb |
| 2014-09-30 | 1338981 | 8.69 ppb |
| 2014-11-18 | 1351363 | 7.29 ppb |
| 2014-11-19 | 1351774 | 0.847 ppb |
| 2014-11-19 | 1351781 | 2.79 ppb |
| 2014-11-19 | 1351784 | 6.84 ppb |
| 2015-01-02 | 1361462 | 10.5 ppb |
| 2015-01-21 | 1367536 | ND |
| 2015-01-21 | 1367537 | 4.46 ppb |
| 2015-01-21 | 1367538 | 4.10 ppb |
| 2015-01-21 | 1367539 | 1.73 ppb |
| 2015-01-21 | 1367540 | 0.828 ppb |
| 2015-01-28 | 1368365 | 5.17 ppb |
| 2015-02-04 | 1370213 | 2.66 ppb |
| 2015-02-04 | 1370214 | 1.74 ppb |
| 2015-02-04 | 1370615 | 21.2 ppb |
| 2015-02-11 | 1371912 | 1.79 ppb |
| 2015-02-11 | 1371913 | 9.19 ppb |
| 2015-02-11 | 1371914 | 11.0 ppb |
| 2015-03-30 | 1382859 | 2.73 ppb |
| 2015-05-12 | 1394895 | 8.81 ppb |
| 2015-05-26 | 1397834 | 9.94 ppb |
| 2015-05-26 | 1397835 | 3.18 ppb |
| 2015-05-26 | 1397840 | 1.36 ppb |
| 2015-06-19 | 1404502 | 1.86 ppb |
| 2015-08-04 | 1416252 | 8.76 ppb |
| 2015-08-04 | 1416253 | 0.566 ppb |
| 2015-08-04 | 1416254 | 4.80 ppb |
| 2015-08-04 | 1416261 | 2.45 ppb |
| 2015-09-08 | 1425573 | 2.30 ppb |
| 2015-09-08 | 1425575 | 4.31 ppb |
| 2015-09-08 | 1425576 | 15.4 ppb |
| 2015-09-08 | 1425577 | 1.78 ppb |
| 2015-09-08 | 1425578 | 0.539 ppb |
| 2015-09-22 | 1430181 | 3.51 ppb |
| 2015-09-22 | 1430182 | 8.00 ppb |
| 2015-09-22 | 1430183 | 11.6 ppb |
| 2015-09-22 | 1430184 | 3.53 ppb |
| 2015-09-22 | 1430185 | 0.795 ppb |
| 2015-09-24 | 1430186 | ND |
| 2015-10-05 | 1432414 | 2.63 ppb |
| 2015-10-05 | 1432417 | ND |
| 2015-10-05 | 1432418 | 4.38 ppb |
| 2015-10-05 | 1432419 | 1.000 ppb |
| 2015-10-05 | 1432420 | 4.68 ppb |
| 2015-10-13 | 1435400 | 1.29 ppb |
| 2015-10-19 | 1436486 | 3.44 ppb |
| 2015-10-19 | 1436488 | 2.15 ppb |
| 2015-10-19 | 1436489 | 0.789 ppb |
| 2015-10-19 | 1436490 | 4.67 ppb |
| 2015-10-19 | 1436491 | 7.54 ppb |
| 2015-11-03 | 1441387 | 1.64 ppb |
| 2015-11-04 | 1441480 | 10.2 ppb |
| 2015-11-04 | 1441481 | 10.7 ppb |
| 2015-11-04 | 1441482 | 6.72 ppb |
| 2015-11-04 | 1441483 | 10.7 ppb |
| 2015-11-04 | 1441484 | 1.23 ppb |
| 2015-11-05 | 1442397 | 5.47 ppb |
| 2015-11-05 | 1442399 | 2.06 ppb |
| 2015-11-05 | 1442400 | 0.510 ppb |
| 2015-11-05 | 1442401 | 3.99 ppb |
| 2015-11-05 | 1442402 | 2.54 ppb |
| 2015-11-05 | 1442403 | ND |
| 2015-11-05 | 1442404 | 5.74 ppb |
| 2015-11-05 | 1442405 | 6.05 ppb |
| 2015-12-01 | 1448478 | 2.97 ppb |
| 2015-12-01 | 1448479 | 1.69 ppb |
| 2015-12-01 | 1448480 | 0.674 ppb |
| 2015-12-01 | 1448481 | 3.91 ppb |
| 2015-12-01 | 1448482 | 5.71 ppb |
| 2015-12-29 | 1454877 | ND |
| 2015-12-29 | 1454878 | 0.947 ppb |
| 2015-12-29 | 1454879 | 2.37 ppb |
| 2015-12-29 | 1454880 | 1.61 ppb |
| 2015-12-29 | 1454881 | 7.76 ppb |
| 2015-12-29 | 1454882 | 4.78 ppb |
| 2015-12-30 | 1454865 | ND |
| 2016-01-05 | 1456546 | 4.54 ppb |
| 2016-01-12 | 1458363 | 2.60 ppb |
| 2016-01-12 | 1458364 | 8.75 ppb |
| 2016-02-02 | 1464019 | 0.672 ppb |
| 2016-02-09 | 1466179 | 5.08 ppb |
| 2016-03-01 | 1471232 | 3.37 ppb |
| 2016-03-01 | 1471234 | 0.997 ppb |
| 2016-03-01 | 1471244 | 2.20 ppb |
| 2016-04-12 | 1482271 | 0.803 ppb |
| 2016-04-12 | 1482273 | 7.08 ppb |
| 2016-04-12 | 1482275 | 1.51 ppb |
| 2016-04-12 | 1482276 | 0.976 ppb |
| 2016-05-05 | 1490243 | 2.80 ppb |
| 2016-05-10 | 1490232 | 2.58 ppb |
| 2016-05-17 | 1492324 | 4.41 ppb |
| 2016-06-02 | 1496450 | 0.490 ppb |
| 2016-07-07 | 1505616 | 1.11 ppb |
| 2016-07-07 | 1505617 | 8.72 ppb |
| 2016-07-07 | 1505619 | 1.35 ppb |
| 2016-07-07 | 1505620 | 2.71 ppb |
| 2016-07-18 | 1509167 | 2.82 ppb |
| 2016-09-21 | 1526621 | 2.44 ppb |
| 2016-10-05 | 1531497 | 2.49 ppb |
| 2016-10-14 | 1533743 | 4.13 ppb |
| 2016-10-14 | 1533746 | ND |
| 2016-10-14 | 1533747 | ND |
| 2016-11-07 | 1538941 | 5.98 ppb |
| 2016-11-07 | 1538942 | 4.24 ppb |
| 2016-11-07 | 1538946 | 0.529 ppb |
| 2016-11-07 | 1538952 | 7.30 ppb |
| 2016-11-07 | 1538968 | 2.46 ppb |
| 2017-01-05 | 1553370 | 5.22 ppb |
| 2017-02-09 | 1562570 | 0.882 ppb |
| 2017-02-09 | 1562586 | 0.443 ppb |
| 2017-02-21 | 1565871 | 0.677 ppb |
| 2017-02-23 | 1566723 | 3.29 ppb |
| 2017-03-30 | 1575705 | 0.589 ppb |
| 2017-03-30 | 1575712 | 1.23 ppb |
| 2017-03-30 | 1575714 | ND |
| 2017-04-04 | 1576614 | 1.28 ppb |
| 2017-04-11 | 1578805 | 4.40 ppb |
| 2017-04-11 | 1578807 | 4.28 ppb |
| 2017-04-20 | 1581689 | 3.46 ppb |
| 2017-08-02 | 1610065 | 3.23 ppb |
| 2017-08-02 | 1610066 | 0.593 ppb |
| 2017-08-02 | 1610067 | ND |
| 2017-08-02 | 1610068 | 2.58 ppb |
| 2017-08-02 | 1610069 | ND |
| 2017-08-02 | 1610070 | ND |
| 2017-08-02 | 1610071 | ND |
| 2017-09-05 | 1619080 | 1.87 ppb |
| 2017-09-05 | 1619081 | 0.706 ppb |
| 2017-09-05 | 1619082 | 6.22 ppb |
| 2017-09-05 | 1619083 | 2.74 ppb |
| 2017-09-25 | 1624711 | 2.84 ppb |
| 2017-10-09 | 1628520 | 0.656 ppb |
| 2017-10-09 | 1628521 | 3.42 ppb |
| 2017-10-09 | 1628529 | 0.693 ppb |
| 2017-10-09 | 1628532 | 3.96 ppb |
| 2017-10-09 | 1628533 | 2.80 ppb |
| 2017-11-13 | 1638068 | 3.39 ppb |
| 2018-01-25 | 8A25082-02 | ND |
| 2018-02-14 | AB15084-09 | ND |
| 2018-02-14 | AB15084-10 | ND |
| 2018-02-14 | AB15084-11 | ND |
| 2018-02-15 | AB15084-03 | 1.000 ppb |
| 2018-03-05 | AC08106-07 | 5.60 ppb |
| 2018-04-30 | 1680570 | 1.18 ppb |
| 2018-05-01 | 1681110 | 4.80 ppb |
| 2018-09-06 | AI06149-02 | ND |
| 2018-10-24 | 1730411 | 9.38 ppb |
| 2019-02-07 | BB07047-04 | ND |
| 2019-04-03 | BD04048-01 | ND |
| 2019-04-03 | BD04048-02 | 5.90 ppb |
| 2019-04-03 | BD04048-03 | ND |
| 2019-04-03 | BD04048-04 | 1.70 ppb |
| 2019-04-04 | BD04068-02 | ND |
| 2019-04-10 | BD11084-01 | 1.40 ppb |
| 2019-04-11 | BD11084-04 | 3.80 ppb |
| 2019-04-22 | BD25045-02 | ND |
| 2019-05-28 | BE30060-01 | ND |
| 2019-05-28 | BE30060-02 | ND |
| 2019-07-11 | BG11116-06 | 2.10 ppb |
| 2019-07-22 | BG25082-02 | 1.10 ppb |
| 2019-10-16 | BJ17103-02 | 1.90 ppb |