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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

California American Water Company - Suburban

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.

 

625

Samples

1

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND940ND
20150.0435 ppb691ND - 3.00 ppb
2016ND830ND
20170.344 ppb1282ND - 41.0 ppb
20180.122 ppb1266ND - 3.00 ppb
2019ND1250ND

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
2014-01-071225-053-1200ND
2014-01-071225-062-1201ND
2014-01-141225-053-1100ND
2014-01-141225-062-1101ND
2014-01-221225-053-1130ND
2014-01-221225-062-1131ND
2014-01-281225-053-1100ND
2014-01-281225-062-1101ND
2014-02-041225-053-0845ND
2014-02-041225-062-0846ND
2014-02-111225-053-1200ND
2014-02-111225-062-1201ND
2014-02-181225-053-1040ND
2014-02-181225-062-1041ND
2014-02-251225-053-1445ND
2014-02-251225-062-1446ND
2014-03-041225-053-1120ND
2014-03-111225-053-1415ND
2014-03-181225-053-1120ND
2014-04-171225-053-1430ND
2014-04-171225-062-1435ND
2014-04-221225-053-0900ND
2014-04-221225-062-0905ND
2014-04-291225-053-1120ND
2014-04-291225-062-1125ND
2014-05-061225-053-1215ND
2014-05-061225-062-1220ND
2014-05-131225-053-1030ND
2014-05-131225-062-1035ND
2014-05-201225-053-1030ND
2014-05-201225-062-1035ND
2014-05-281225-053-0830ND
2014-05-281225-062-0835ND
2014-06-031225-053-0850ND
2014-06-031225-062-0855ND
2014-06-101225-053-1030ND
2014-06-101225-062-1035ND
2014-06-171225-018-1150ND
2014-06-171225-053-1115ND
2014-06-171225-062-1120ND
2014-06-241225-053-1050ND
2014-06-241225-062-1055ND
2014-07-011225-053-0820ND
2014-07-011225-062-0825ND
2014-07-081225-053-0830ND
2014-07-081225-062-0835ND
2014-07-151225-053-0825ND
2014-07-151225-062-0830ND
2014-07-221225-053-0900ND
2014-07-221225-062-0905ND
2014-07-291225-053-0840ND
2014-07-291225-062-0845ND
2014-08-051225-053-0845ND
2014-08-051225-062-0850ND
2014-08-121225-053-0900ND
2014-08-121225-062-0905ND
2014-08-191225-053-1415ND
2014-08-191225-062-1420ND
2014-08-261225-053-0230ND
2014-08-261225-062-0235ND
2014-09-021225-053-1320ND
2014-09-021225-062-1325ND
2014-09-091225-053-1415ND
2014-09-091225-062-1430ND
2014-09-161225-053-1145ND
2014-09-161225-062-1150ND
2014-09-231225-053-1140ND
2014-09-231225-062-1145ND
2014-09-301225-053-1330ND
2014-09-301225-062-1335ND
2014-10-071225-053-1125ND
2014-10-071225-062-1130ND
2014-10-141225-053-1120ND
2014-10-141225-062-1121ND
2014-10-211225-053-1240ND
2014-10-211225-062-1245ND
2014-10-281225-053-1440ND
2014-10-281225-062-1442ND
2014-11-041225-053-1544ND
2014-11-041225-062-1545ND
2014-11-111225-053-1255ND
2014-11-111225-062-1300ND
2014-11-181225-053-1419ND
2014-11-181225-062-1420ND
2014-11-251225-053-1430ND
2014-11-251225-062-1431ND
2014-12-021225-053-1520ND
2014-12-021225-062-1521ND
2014-12-091225-053-0950ND
2014-12-091225-062-0951ND
2014-12-181225-053-1600ND
2014-12-181225-062-1602ND
2014-12-231225-053-1011ND
2014-12-231225-062-1012ND
2015-01-061225-053-1414ND
2015-01-061225-062-1416ND
2015-01-131225-053-1007ND
2015-01-131225-062-1008ND
2015-02-051225-053-1415ND
2015-02-051225-062-1416ND
2015-02-101225-053-1120ND
2015-02-101225-062-1121ND
2015-02-171225-053-1415ND
2015-02-171225-062-1415ND
2015-02-241225-053-1330ND
2015-02-241225-062-1331ND
2015-03-031225-053-1300ND
2015-03-031225-062-1502ND
2015-03-101225-053-1320ND
2015-03-101225-062-1321ND
2015-03-171225-053-1031ND
2015-03-171225-062-1032ND
2015-03-241225-053-1504ND
2015-03-241225-062-1505ND
2015-03-311225-053-1412ND
2015-03-311225-062-1418ND
2015-04-091225-053-1216ND
2015-04-091225-062-1217ND
2015-04-141225-053-1500ND
2015-04-141225-062-1500ND
2015-07-081225-004-0850ND
2015-07-081225-006-0950ND
2015-07-081225-008-0910ND
2015-07-081225-010-1110ND
2015-07-081225-013-1100ND
2015-07-081225-016-1030ND
2015-07-081225-019-0940ND
2015-07-081225-020-1205ND
2015-07-081225-021-1030ND
2015-07-091225-001-0945ND
2015-07-091225-017-1045ND
2015-07-141225-011-1030ND
2015-07-151225-007-0920ND
2015-07-151225-052-1025ND
2015-07-201225-014-09203.00 ppb
2015-07-201225-049-1210ND
2015-07-221225-044-0845ND
2015-07-221225-051-1110ND
2015-07-271225-018-1005ND
2015-07-271225-053-1220ND
2015-07-281225-048-0900ND
2015-07-301225-015-1035ND
2015-08-261225-005-0930ND
2015-08-271225-047-0750ND
2015-11-031225-053-0920ND
2015-11-031225-062-0920ND
2015-11-101225-053-1200ND
2015-11-101225-062-1200ND
2015-11-171225-053-1325ND
2015-11-171225-062-1325ND
2015-11-241225-053-1010ND
2015-11-241225-062-1010ND
2015-12-011225-053-1405ND
2015-12-011225-062-1405ND
2015-12-081225-053-1150ND
2015-12-081225-062-1130ND
2015-12-081225-062-1150ND
2015-12-151225-053-1433ND
2015-12-151225-062-1441ND
2015-12-221225-053-1530ND
2015-12-221225-062-1530ND
2015-12-291225-053-1525ND
2015-12-291225-062-1525ND
2016-01-051225-053-1340ND
2016-01-051225-062-1345ND
2016-01-131225-053-1110ND
2016-01-131225-062-1115ND
2016-01-191225-053-1030ND
2016-01-191225-062-1030ND
2016-01-261225-053-1320ND
2016-01-261225-062-1325ND
2016-02-021225-053-1450ND
2016-02-021225-062-1455ND
2016-02-091225-053-1300ND
2016-02-091225-062-1300ND
2016-02-161225-053-1325ND
2016-02-161225-062-1330ND
2016-02-231225-053-1440ND
2016-02-231225-062-1440ND
2016-03-021225-053-0950ND
2016-03-021225-062-0950ND
2016-03-081225-053-1340ND
2016-03-081225-062-1345ND
2016-03-151225-053-1230ND
2016-03-151225-062-1230ND
2016-03-221225-053-1145ND
2016-03-221225-062-1145ND
2016-03-291225-053-1052ND
2016-03-291225-062-1053ND
2016-04-051225-053-1024ND
2016-04-051225-062-1024ND
2016-04-121225-053-0930ND
2016-04-121225-062-0930ND
2016-05-031225-053-1510ND
2016-05-031225-062-1510ND
2016-05-101225-053-1440ND
2016-05-101225-062-1440ND
2016-05-171225-053-0745ND
2016-05-171225-062-0745ND
2016-05-241225-053-0940ND
2016-05-241225-062-0945ND
2016-05-311225-053-0930ND
2016-05-311225-062-0932ND
2016-06-141225-053-1350ND
2016-06-141225-062-1351ND
2016-06-211225-053-1315ND
2016-06-211225-062-1315ND
2016-06-281225-053-1300ND
2016-06-281225-062-1300ND
2016-07-051225-053-1217ND
2016-07-051225-062-1215ND
2016-07-121225-053-1010ND
2016-07-121225-062-1013ND
2016-07-191225-053-1315ND
2016-07-191225-062-1320ND
2016-09-131225-053-1123ND
2016-09-131225-062-1122ND
2016-09-201225-053-1325ND
2016-09-201225-062-1335ND
2016-09-271225-053-0949ND
2016-09-271225-062-0946ND
2016-10-041225-053-0945ND
2016-10-041225-062-0950ND
2016-10-111225-053-0959ND
2016-10-111225-062-1005ND
2016-10-181225-053-1320ND
2016-10-181225-062-1322ND
2016-10-241225-012-0930ND
2016-10-251225-053-0957ND
2016-10-251225-062-1000ND
2016-11-011225-053-1000ND
2016-11-011225-062-1005ND
2016-11-091225-053-0905ND
2016-11-091225-062-0910ND
2016-11-151225-053-1130ND
2016-11-151225-062-1135ND
2016-11-221225-053-0910ND
2016-11-221225-062-0915ND
2016-11-291225-053-1120ND
2016-11-291225-062-1135ND
2016-12-151225-053-1210ND
2016-12-151225-062-1215ND
2016-12-201225-053-1245ND
2016-12-201225-062-1250ND
2016-12-271225-053-0900ND
2016-12-271225-062-0900ND
2017-01-041225-053-1225ND
2017-01-041225-062-1230ND
2017-01-101225-053-1330ND
2017-01-101225-062-1335ND
2017-01-171225-053-0945ND
2017-01-171225-062-0950ND
2017-01-241225-053-1000ND
2017-01-241225-062-1005ND
2017-02-281225-053-1200ND
2017-02-281225-062-1205ND
2017-03-071225-053-1035ND
2017-03-071225-062-1040ND
2017-03-141225-053-1205ND
2017-03-141225-062-1210ND
2017-03-211225-053-1150ND
2017-03-211225-062-1155ND
2017-03-281225-053-1345ND
2017-03-281225-062-1350ND
2017-04-041225-053-0840ND
2017-04-041225-062-0845ND
2017-04-111225-053-1520ND
2017-04-111225-062-1530ND
2017-04-181225-053-1250ND
2017-04-181225-062-1255ND
2017-04-251225-053-0850ND
2017-04-251225-062-0855ND
2017-05-021225-053-1010ND
2017-05-021225-062-1015ND
2017-05-091225-053-0900ND
2017-05-091225-062-0905ND
2017-05-161225-053-1040ND
2017-05-161225-062-1045ND
2017-05-231225-053-1000ND
2017-05-231225-062-1005ND
2017-05-301225-053-1310ND
2017-05-301225-062-1315ND
2017-06-061225-053-0840ND
2017-06-061225-062-0845ND
2017-06-131225-053-0745ND
2017-06-131225-062-0750ND
2017-06-201225-053-0840ND
2017-06-201225-062-0845ND
2017-06-271225-053-1025ND
2017-06-271225-062-1030ND
2017-07-051225-053-1320ND
2017-07-051225-062-1325ND
2017-07-111225-053-0950ND
2017-07-111225-062-0955ND
2017-07-181225-053-1155ND
2017-07-181225-062-1200ND
2017-07-251225-053-1040ND
2017-07-251225-062-1045ND
2017-08-011225-053-0910ND
2017-08-011225-062-0915ND
2017-08-081225-053-1000ND
2017-08-081225-062-1005ND
2017-08-151225-053-0840ND
2017-08-151225-062-0845ND
2017-08-221225-053-1025ND
2017-08-221225-062-1030ND
2017-08-291225-053-0830ND
2017-08-291225-062-0835ND
2017-09-051225-053-0825ND
2017-09-051225-062-0830ND
2017-09-121225-053-0945ND
2017-09-121225-062-0950ND
2017-09-195810-010-1420ND
2017-09-191225-053-1110ND
2017-09-191225-062-1115ND
2017-09-195810-066-152041.0 ppb
2017-09-265810-010-1328ND
2017-09-261225-053-0810ND
2017-09-261225-062-0815ND
2017-09-265810-064-1343ND
2017-09-265810-066-1348ND
2017-10-035810-010-0730ND
2017-10-031225-053-1030ND
2017-10-031225-062-1030ND
2017-10-035810-064-0745ND
2017-10-035810-066-0750ND
2017-10-105810-010-1442ND
2017-10-101225-053-1328ND
2017-10-101225-062-1330ND
2017-10-105810-064-1500ND
2017-10-105810-066-1505ND
2017-10-121225-050-1240ND
2017-10-175810-010-1342ND
2017-10-171225-053-0730ND
2017-10-171225-062-0730ND
2017-10-245810-010-1350ND
2017-10-241225-053-0805ND
2017-10-241225-062-0805ND
2017-10-245810-064-1405ND
2017-10-245810-066-1410ND
2017-10-315810-010-1228ND
2017-10-311225-053-0800ND
2017-10-311225-062-0800ND
2017-10-315810-064-1243ND
2017-10-315810-066-1248ND
2017-11-075810-010-0915ND
2017-11-075810-064-0930ND
2017-11-075810-066-0935ND
2017-11-081225-053-1345ND
2017-11-081225-062-1345ND
2017-11-145810-010-1226ND
2017-11-141225-053-1428ND
2017-11-141225-062-1428ND
2017-11-145810-064-1241ND
2017-11-145810-066-1246ND
2017-11-215810-010-1118ND
2017-11-211225-053-0755ND
2017-11-211225-062-0755ND
2017-11-215810-064-1133ND
2017-11-215810-066-1138ND
2017-11-285810-010-1337ND
2017-11-285810-064-1352ND
2017-11-285810-066-1357ND
2017-11-291225-053-1420ND
2017-11-291225-062-1120ND
2017-12-051225-053-0815ND
2017-12-051225-062-0820ND
2017-12-061225-014-11403.00 ppb
2017-12-121225-053-1120ND
2017-12-121225-062-1125ND
2017-12-191225-053-1120ND
2017-12-191225-062-1120ND
2017-12-261225-053-1048ND
2017-12-261225-062-1048ND
2018-01-021225-053-1537ND
2018-01-021225-062-1537ND
2018-01-091225-053-1230ND
2018-01-091225-062-1230ND
2018-01-161225-053-1245ND
2018-01-161225-062-1245ND
2018-01-231225-053-1330ND
2018-01-231225-062-1330ND
2018-01-301225-053-1228ND
2018-01-301225-062-1228ND
2018-02-061225-053-1445ND
2018-02-061225-062-1445ND
2018-02-131225-053-1250ND
2018-02-131225-062-1250ND
2018-02-205810-010-10302.70 ppb
2018-02-201225-053-1505ND
2018-02-201225-062-1505ND
2018-02-205810-063-1045ND
2018-02-205810-064-1050ND
2018-02-205810-065-1055ND
2018-02-205810-066-1100ND
2018-02-271225-053-1115ND
2018-02-271225-062-1115ND
2018-03-061225-053-1340ND
2018-03-061225-062-1340ND
2018-03-125810-010-0936ND
2018-03-125810-063-0950ND
2018-03-125810-064-0955ND
2018-03-125810-065-1000ND
2018-03-125810-066-1005ND
2018-05-015810-010-1145ND
2018-05-015810-063-1200ND
2018-05-015810-064-1205ND
2018-05-015810-065-1210ND
2018-05-015810-066-1215ND
2018-05-241225-062-15043.00 ppb
2018-05-291225-053-1215ND
2018-05-291225-062-1215ND
2018-06-051225-053-1140ND
2018-06-051225-062-1143ND
2018-06-121225-053-1014ND
2018-06-121225-062-1014ND
2018-06-201225-053-1108ND
2018-06-201225-062-1108ND
2018-06-261225-053-1410ND
2018-06-261225-062-1410ND
2018-07-031225-053-0804ND
2018-07-031225-062-0804ND
2018-07-101225-053-1103ND
2018-07-101225-062-1103ND
2018-07-171225-053-1250ND
2018-07-171225-062-1250ND
2018-07-241233-053-0924ND
2018-07-241233-062-0924ND
2018-08-061233-005-0810ND
2018-08-061233-014-10552.90 ppb
2018-08-061233-018-0915ND
2018-08-061233-020-12402.20 ppb
2018-08-061233-051-1230ND
2018-08-071225-053-0800ND
2018-08-071225-062-0800ND
2018-08-081233-007-0945ND
2018-08-081233-011-1305ND
2018-08-081233-044-1110ND
2018-08-081233-047-1230ND
2018-08-091233-004-0905ND
2018-08-091233-006-1300ND
2018-08-091233-016-0815ND
2018-08-091233-049-11002.40 ppb
2018-08-091233-052-1250ND
2018-08-131233-001-0850ND
2018-08-131233-010-1140ND
2018-08-131233-013-1015ND
2018-08-131233-017-0900ND
2018-08-131233-019-1015ND
2018-08-131233-021-1020ND
2018-08-145810-010-1415ND
2018-08-141233-012-1130ND
2018-08-141225-053-0855ND
2018-08-141233-053-0905ND
2018-08-141233-062-0840ND
2018-08-141225-062-0855ND
2018-08-145810-063-1425ND
2018-08-145810-064-1430ND
2018-08-145810-065-1435ND
2018-08-145810-066-1440ND
2018-08-231225-053-0805ND
2018-08-231225-062-0805ND
2018-08-281225-053-1222ND
2018-08-281225-062-1222ND
2018-09-041225-053-1250ND
2018-09-041225-062-1250ND
2018-09-111233-009-08452.20 ppb
2018-09-111225-053-1307ND
2018-09-111225-062-1307ND
2018-10-101225-053-1330ND
2018-10-101225-062-1335ND
2018-10-161225-053-1140ND
2018-10-161225-062-1145ND
2018-10-171233-008-1030ND
2018-10-171233-023-1115ND
2018-10-231225-053-1340ND
2018-10-231225-062-1345ND
2018-10-301225-053-0910ND
2018-10-301225-062-0915ND
2018-11-065810-010-1030ND
2018-11-065810-063-1035ND
2018-11-065810-064-1040ND
2018-11-065810-065-1045ND
2018-11-065810-066-1050ND
2018-11-071225-053-1145ND
2018-11-071225-062-1145ND
2018-11-131225-053-0820ND
2018-11-131225-062-0822ND
2018-11-201225-053-1205ND
2018-11-201225-062-1210ND
2018-11-281225-053-1230ND
2018-11-281225-062-1235ND
2018-12-041225-053-0800ND
2018-12-041225-062-0805ND
2018-12-111225-053-0825ND
2018-12-111225-062-0830ND
2018-12-181225-053-1645ND
2018-12-181225-062-1650ND
2018-12-261225-053-1430ND
2018-12-261225-062-1435ND
2019-01-081225-053-1540ND
2019-01-081225-062-1545ND
2019-01-151225-053-1555ND
2019-01-151225-062-1555ND
2019-01-221225-053-1310ND
2019-01-221225-062-1315ND
2019-01-291225-053-1640ND
2019-01-291225-062-1645ND
2019-02-051225-053-1300ND
2019-02-051225-062-1305ND
2019-02-125810-010-1100ND
2019-02-121225-053-1705ND
2019-02-121225-062-1710ND
2019-02-125810-063-1105ND
2019-02-125810-064-1110ND
2019-02-125810-065-1115ND
2019-02-125810-066-1120ND
2019-02-191225-053-1625ND
2019-02-191225-062-1630ND
2019-02-261225-053-1505ND
2019-02-261225-062-1510ND
2019-03-051225-053-1300ND
2019-03-051225-062-1305ND
2019-03-121225-053-1638ND
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