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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

California American Water Company - Parkway

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.

 

891

Samples

0

Samples exceeding legal limit (MCL)

544

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.98 ppb14962ND - 9.00 ppb
20152.37 ppb15083ND - 6.00 ppb
20162.81 ppb15198ND - 6.00 ppb
20172.62 ppb13997ND - 6.00 ppb
20182.84 ppb155114ND - 6.00 ppb
20192.27 ppb14790ND - 7.00 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
2014-01-071225-033-1130ND
2014-01-071225-034-1055ND
2014-01-141225-033-1235ND
2014-01-141225-034-0910ND
2014-01-211225-033-1150ND
2014-01-211225-034-0845ND
2014-01-281225-033-1040ND
2014-01-281225-034-0935ND
2014-02-041225-033-1100ND
2014-02-041225-034-0925ND
2014-02-111225-033-1335ND
2014-02-111225-034-1105ND
2014-02-181225-032-12159.00 ppb
2014-02-181225-033-1030ND
2014-02-181225-034-1303ND
2014-02-251225-032-15358.00 ppb
2014-02-251225-033-1355ND
2014-02-251225-034-1440ND
2014-03-041225-032-11008.00 ppb
2014-03-041225-033-1305ND
2014-03-041225-034-0930ND
2014-03-111225-032-13456.00 ppb
2014-03-111225-033-1145ND
2014-03-111225-034-1005ND
2014-03-181225-032-13307.00 ppb
2014-03-181225-033-1240ND
2014-03-181225-034-1005ND
2014-03-251225-032-14207.00 ppb
2014-03-251225-033-1315ND
2014-03-251225-034-0930ND
2014-04-011225-032-11406.00 ppb
2014-04-011225-033-1055ND
2014-04-011225-034-1405ND
2014-04-081225-032-14007.00 ppb
2014-04-081225-033-1305ND
2014-04-091225-034-1155ND
2014-04-151225-032-11506.00 ppb
2014-04-151225-033-1010ND
2014-04-151225-034-1125ND
2014-04-221225-032-12406.00 ppb
2014-04-221225-033-1145ND
2014-04-221225-034-1004ND
2014-04-291225-032-11505.00 ppb
2014-04-291225-033-1020ND
2014-04-291225-034-0855ND
2014-05-061225-032-12045.00 ppb
2014-05-061225-033-1020ND
2014-05-061225-034-0924ND
2014-05-131225-032-11005.00 ppb
2014-05-131225-033-1010ND
2014-05-131225-034-0930ND
2014-05-201225-032-12145.00 ppb
2014-05-201225-033-1030ND
2014-05-201225-034-0924ND
2014-05-271225-032-10155.00 ppb
2014-05-271225-033-1110ND
2014-05-271225-034-09293.00 ppb
2014-06-031225-032-08055.00 ppb
2014-06-031225-033-0750ND
2014-06-041225-034-13453.00 ppb
2014-06-101225-032-14005.00 ppb
2014-06-101225-033-1115ND
2014-06-101225-034-1435ND
2014-06-171225-032-10505.00 ppb
2014-06-171225-033-0955ND
2014-06-171225-034-1330ND
2014-06-241225-032-11054.00 ppb
2014-06-241225-033-1005ND
2014-06-241225-034-1310ND
2014-07-011225-032-09104.00 ppb
2014-07-011225-033-1315ND
2014-07-011225-034-1035ND
2014-07-081225-032-11555.00 ppb
2014-07-081225-033-1035ND
2014-07-081225-034-09283.00 ppb
2014-07-161225-032-13005.00 ppb
2014-07-161225-033-1144ND
2014-07-161225-034-1015ND
2014-07-221225-032-12154.00 ppb
2014-07-221225-033-1115ND
2014-07-221225-034-1005ND
2014-07-291225-032-10465.00 ppb
2014-07-291225-033-1125ND
2014-07-291225-034-1004ND
2014-08-051225-032-11355.00 ppb
2014-08-051225-033-0920ND
2014-08-051225-034-1059ND
2014-08-121225-017-11155.00 ppb
2014-08-121225-032-08474.00 ppb
2014-08-121225-033-1019ND
2014-08-121225-034-0934ND
2014-08-191225-032-08405.00 ppb
2014-08-191225-033-1120ND
2014-08-191225-034-1020ND
2014-08-261225-032-09394.00 ppb
2014-08-261225-033-1024ND
2014-08-261225-034-1135ND
2014-09-021225-032-10245.00 ppb
2014-09-021225-033-1235ND
2014-09-021225-034-09183.00 ppb
2014-09-091225-033-1245ND
2014-09-091225-034-11453.00 ppb
2014-09-161225-032-10455.00 ppb
2014-09-161225-033-1205ND
2014-09-161225-034-09303.00 ppb
2014-09-231225-032-10295.00 ppb
2014-09-231225-033-1225ND
2014-09-231225-034-09463.00 ppb
2014-09-301225-032-08205.00 ppb
2014-09-301225-033-1210ND
2014-09-301225-034-15053.00 ppb
2014-10-071225-032-08505.00 ppb
2014-10-071225-033-1005ND
2014-10-071225-034-11003.00 ppb
2014-10-141225-032-13145.00 ppb
2014-10-141225-033-1400ND
2014-10-151225-034-1105ND
2014-10-211225-032-09195.00 ppb
2014-10-211225-033-1010ND
2014-10-211225-034-11503.00 ppb
2014-10-281225-032-08245.00 ppb
2014-10-281225-033-0945ND
2014-10-281225-034-12503.00 ppb
2014-11-041225-032-08276.00 ppb
2014-11-041225-033-0935ND
2014-11-041225-034-13303.00 ppb
2014-11-111225-032-08355.00 ppb
2014-11-111225-033-0914ND
2014-11-111225-034-0935ND
2014-11-181225-032-09055.00 ppb
2014-11-181225-033-1005ND
2014-11-181225-034-0850ND
2014-11-251225-032-10545.00 ppb
2014-11-251225-033-1210ND
2014-11-251225-034-09583.00 ppb
2014-12-021225-032-11435.00 ppb
2014-12-021225-033-0938ND
2014-12-021225-034-12253.00 ppb
2014-12-091225-032-12445.00 ppb
2014-12-091225-033-0919ND
2014-12-091225-034-11143.00 ppb
2014-12-161225-032-11545.00 ppb
2014-12-161225-034-1319ND
2014-12-231225-032-10485.00 ppb
2014-12-231225-033-0938ND
2014-12-231225-034-1144ND
2014-12-301225-032-10176.00 ppb
2014-12-301225-033-0914ND
2014-12-301225-034-12473.00 ppb
2015-01-061225-032-09375.00 ppb
2015-01-061225-033-0907ND
2015-01-061225-034-11373.00 ppb
2015-01-131225-032-10375.00 ppb
2015-01-131225-033-1120ND
2015-01-131225-034-13333.00 ppb
2015-01-201225-032-10055.00 ppb
2015-01-201225-033-0905ND
2015-01-201225-034-11533.00 ppb
2015-01-271225-032-12105.00 ppb
2015-01-271225-033-1120ND
2015-01-271225-034-10103.00 ppb
2015-02-031225-032-08305.00 ppb
2015-02-031225-033-0945ND
2015-02-101225-032-11155.00 ppb
2015-02-101225-033-1238ND
2015-02-171225-032-10084.00 ppb
2015-02-171225-033-0819ND
2015-02-241225-032-10095.00 ppb
2015-02-241225-033-1127ND
2015-03-031225-032-08564.00 ppb
2015-03-031225-033-1044ND
2015-03-101225-032-08005.00 ppb
2015-03-101225-033-0910ND
2015-03-171225-032-09455.00 ppb
2015-03-171225-033-0819ND
2015-03-171225-034-1226ND
2015-03-241225-032-09305.00 ppb
2015-03-241225-033-1310ND
2015-03-241225-034-11353.00 ppb
2015-03-311225-032-08285.00 ppb
2015-03-311225-033-1025ND
2015-03-311225-034-12453.00 ppb
2015-04-071225-032-08595.00 ppb
2015-04-071225-033-0955ND
2015-04-071225-034-0818ND
2015-04-141225-032-11545.00 ppb
2015-04-141225-033-0945ND
2015-04-141225-034-08533.00 ppb
2015-04-211225-032-12205.00 ppb
2015-04-211225-033-1034ND
2015-04-211225-034-1110ND
2015-04-281225-032-09145.00 ppb
2015-04-281225-033-1135ND
2015-04-281225-034-08193.00 ppb
2015-05-051225-032-08355.00 ppb
2015-05-051225-033-1025ND
2015-05-051225-034-08043.00 ppb
2015-05-121225-032-08205.00 ppb
2015-05-121225-033-0925ND
2015-05-121225-034-12053.00 ppb
2015-05-191225-032-14356.00 ppb
2015-05-191225-033-1330ND
2015-05-191225-034-12483.00 ppb
2015-05-261225-032-12395.00 ppb
2015-05-261225-033-1350ND
2015-05-261225-034-12193.00 ppb
2015-06-021225-032-08305.00 ppb
2015-06-021225-033-0905ND
2015-06-021225-034-1205ND
2015-06-091225-032-08454.00 ppb
2015-06-091225-033-1020ND
2015-06-091225-034-1255ND
2015-06-161225-032-10255.00 ppb
2015-06-161225-033-1125ND
2015-06-161225-034-0855ND
2015-06-231225-032-10254.00 ppb
2015-06-231225-033-1129ND
2015-06-231225-034-1245ND
2015-06-301225-032-12004.00 ppb
2015-06-301225-033-1220ND
2015-06-301225-034-10053.00 ppb
2015-07-071225-032-10204.00 ppb
2015-07-071225-033-1125ND
2015-07-071225-034-14133.00 ppb
2015-07-141225-032-08405.00 ppb
2015-07-141225-033-1045ND
2015-07-141225-034-14053.00 ppb
2015-07-151225-002-09404.00 ppb
2015-07-151225-014-10303.00 ppb
2015-07-151225-015-08403.00 ppb
2015-07-151225-023-11354.00 ppb
2015-07-151225-025-1225ND
2015-07-151225-032-10205.00 ppb
2015-07-151225-033-1205ND
2015-07-161225-016-1030ND
2015-07-201225-003-10303.00 ppb
2015-07-201225-008-09303.00 ppb
2015-07-201225-013-08454.00 ppb
2015-07-201225-024-1150ND
2015-07-201225-034-11303.00 ppb
2015-07-211225-032-10155.00 ppb
2015-07-211225-033-0915ND
2015-07-211225-034-11203.00 ppb
2015-07-221225-011-10453.00 ppb
2015-07-221225-018-09254.00 ppb
2015-07-221225-026-10003.00 ppb
2015-07-281225-032-12405.00 ppb
2015-07-281225-033-0930ND
2015-07-281225-034-08153.00 ppb
2015-08-041225-032-08205.00 ppb
2015-08-041225-033-0755ND
2015-08-041225-034-09053.00 ppb
2015-08-111225-032-10455.00 ppb
2015-08-111225-033-0940ND
2015-08-111225-034-0835ND
2015-08-181225-032-10405.00 ppb
2015-08-181225-033-0900ND
2015-08-181225-034-1220ND
2015-08-251225-032-06505.00 ppb
2015-08-251225-033-1005ND
2015-08-251225-034-12153.00 ppb
2015-09-011225-032-08405.00 ppb
2015-09-011225-033-1025ND
2015-09-011225-034-1130ND
2015-09-081225-032-14054.00 ppb
2015-09-081225-033-1125ND
2015-09-081225-034-0920ND
2015-09-151225-032-11505.00 ppb
2015-09-151225-033-1250ND
2015-09-221225-032-12356.00 ppb
2015-09-221225-033-1045ND
2015-09-291225-032-08165.00 ppb
2015-09-291225-033-0920ND
2015-10-061225-032-10505.00 ppb
2015-10-061225-033-1045ND
2015-10-131225-032-09005.00 ppb
2015-10-131225-033-0945ND
2015-10-201225-032-11555.00 ppb
2015-10-201225-033-1015ND
2015-10-271225-032-11205.00 ppb
2015-10-271225-033-1010ND
2015-11-031225-032-11156.00 ppb
2015-11-031225-033-1025ND
2015-11-101225-032-11205.00 ppb
2015-11-101225-033-0955ND
2015-11-171225-032-11275.00 ppb
2015-11-171225-033-0945ND
2015-11-241225-032-08505.00 ppb
2015-11-241225-033-1015ND
2015-12-011225-032-13075.00 ppb
2015-12-011225-033-1245ND
2015-12-081225-032-10205.00 ppb
2015-12-081225-033-0905ND
2015-12-151225-032-10005.00 ppb
2015-12-151225-033-0857ND
2015-12-221225-032-13106.00 ppb
2015-12-221225-033-1020ND
2015-12-301225-032-09405.00 ppb
2015-12-301225-033-0845ND
2016-01-051225-032-10355.00 ppb
2016-01-051225-033-1230ND
2016-01-121225-032-13355.00 ppb
2016-01-121225-033-0905ND
2016-01-191225-032-09105.00 ppb
2016-01-191225-033-0950ND
2016-01-261225-032-11205.00 ppb
2016-01-261225-033-1000ND
2016-02-021225-032-10455.00 ppb
2016-02-021225-033-0955ND
2016-02-091225-032-08555.00 ppb
2016-02-091225-033-0945ND
2016-02-091225-034-11053.00 ppb
2016-02-161225-032-11155.00 ppb
2016-02-161225-033-1030ND
2016-02-161225-034-09153.00 ppb
2016-02-231225-032-08155.00 ppb
2016-02-231225-033-0925ND
2016-02-231225-034-10353.00 ppb
2016-03-021225-032-09405.00 ppb
2016-03-021225-033-1055ND
2016-03-021225-034-12503.00 ppb
2016-03-081225-032-08505.00 ppb
2016-03-081225-033-1100ND
2016-03-081225-034-12204.00 ppb
2016-03-151225-032-09206.00 ppb
2016-03-151225-033-1015ND
2016-03-151225-034-13504.00 ppb
2016-03-221225-032-09106.00 ppb
2016-03-221225-033-1005ND
2016-03-221225-034-11055.00 ppb
2016-03-291225-032-08515.00 ppb
2016-03-291225-033-1010ND
2016-03-291225-034-12554.00 ppb
2016-04-051225-032-12105.00 ppb
2016-04-051225-033-1320ND
2016-04-051225-034-09555.00 ppb
2016-04-121225-032-08455.00 ppb
2016-04-121225-033-0920ND
2016-04-121225-034-11554.00 ppb
2016-04-191225-032-11205.00 ppb
2016-04-191225-033-0915ND
2016-04-191225-034-08155.00 ppb
2016-04-261225-032-10255.00 ppb
2016-04-261225-033-0825ND
2016-04-261225-034-13455.00 ppb
2016-05-031225-032-09455.00 ppb
2016-05-031225-033-1055ND
2016-05-031225-034-08205.00 ppb
2016-05-101225-032-08255.00 ppb
2016-05-101225-033-0940ND
2016-05-101225-034-12154.00 ppb
2016-05-171225-032-10205.00 ppb
2016-05-171225-033-0835ND
2016-05-171225-034-11355.00 ppb
2016-05-241225-032-08005.00 ppb
2016-05-241225-033-0845ND
2016-05-241225-034-09154.00 ppb
2016-05-311225-032-09155.00 ppb
2016-05-311225-033-1150ND
2016-06-011225-034-16204.00 ppb
2016-06-071225-032-09005.00 ppb
2016-06-071225-033-0955ND
2016-06-071225-034-12056.00 ppb
2016-06-141225-032-13555.00 ppb
2016-06-141225-033-1425ND
2016-06-141225-034-09154.00 ppb
2016-06-211225-032-08555.00 ppb
2016-06-211225-033-0955ND
2016-06-211225-034-11554.00 ppb
2016-06-281225-032-13205.00 ppb
2016-06-281225-033-1130ND
2016-06-281225-034-10154.00 ppb
2016-07-051225-032-09255.00 ppb
2016-07-051225-033-1010ND
2016-07-051225-034-12104.00 ppb
2016-07-121225-032-10206.00 ppb
2016-07-121225-033-0915ND
2016-07-121225-034-08303.00 ppb
2016-07-191225-032-07456.00 ppb
2016-07-191225-033-0905ND
2016-07-191225-034-09503.00 ppb
2016-07-261225-032-10055.00 ppb
2016-07-261225-033-0925ND
2016-07-261225-034-12103.00 ppb
2016-08-021225-032-08355.00 ppb
2016-08-021225-033-1205ND
2016-08-021225-034-09053.00 ppb
2016-08-091225-032-07555.00 ppb
2016-08-091225-033-0835ND
2016-08-091225-034-10003.00 ppb
2016-08-161225-032-10105.00 ppb
2016-08-161225-033-1045ND
2016-08-161225-034-13053.00 ppb
2016-08-231225-032-08205.00 ppb
2016-08-231225-033-0945ND
2016-08-231225-034-11003.00 ppb
2016-08-301225-032-11455.00 ppb
2016-08-301225-033-1050ND
2016-08-301225-034-13403.00 ppb
2016-09-071225-032-08505.00 ppb
2016-09-071225-033-0950ND
2016-09-071225-034-13304.00 ppb
2016-09-131225-032-10055.00 ppb
2016-09-131225-033-1140ND
2016-09-131225-034-09053.00 ppb
2016-09-201225-032-09554.00 ppb
2016-09-201225-033-1144ND
2016-09-201225-034-13183.00 ppb
2016-09-271225-032-10155.00 ppb
2016-09-271225-033-1115ND
2016-09-271225-034-13473.00 ppb
2016-10-041225-032-11185.00 ppb
2016-10-041225-033-1258ND
2016-10-041225-034-08273.00 ppb
2016-10-111225-032-11225.00 ppb
2016-10-111225-033-1150ND
2016-10-111225-034-09283.00 ppb
2016-10-181225-032-14305.00 ppb
2016-10-181225-033-0849ND
2016-10-181225-034-10453.00 ppb
2016-10-251225-032-13055.00 ppb
2016-10-251225-033-1137ND
2016-10-251225-034-08243.00 ppb
2016-11-011225-032-12305.00 ppb
2016-11-011225-033-1000ND
2016-11-011225-034-09303.00 ppb
2016-11-081225-032-12485.00 ppb
2016-11-081225-033-1455ND
2016-11-081225-034-09583.00 ppb
2016-11-151225-032-10505.00 ppb
2016-11-151225-034-09052.00 ppb
2016-11-161225-033-1335ND
2016-11-221225-032-15514.00 ppb
2016-11-221225-033-1347ND
2016-11-221225-034-10113.00 ppb
2016-11-291225-032-14315.00 ppb
2016-11-291225-033-0806ND
2016-11-291225-034-09232.00 ppb
2016-12-061225-032-10545.00 ppb
2016-12-061225-033-1137ND
2016-12-061225-034-08183.00 ppb
2016-12-131225-032-11465.00 ppb
2016-12-131225-033-0830ND
2016-12-131225-034-13062.00 ppb
2016-12-201225-032-10565.00 ppb
2016-12-201225-033-0815ND
2016-12-201225-034-12363.00 ppb
2016-12-271225-032-13355.00 ppb
2016-12-271225-033-1125ND
2016-12-271225-034-1310ND
2017-01-031225-032-12295.00 ppb
2017-01-031225-033-0844ND
2017-01-031225-034-13482.00 ppb
2017-01-101225-032-15085.00 ppb
2017-01-101225-033-0837ND
2017-01-101225-034-12553.00 ppb
2017-01-171225-032-11225.00 ppb
2017-01-171225-033-1354ND
2017-01-171225-034-08583.00 ppb
2017-01-241225-032-09485.00 ppb
2017-01-241225-034-1319ND
2017-01-311225-032-12095.00 ppb
2017-01-311225-034-13033.00 ppb
2017-02-071225-032-10445.00 ppb
2017-02-071225-034-12333.00 ppb
2017-02-141225-032-11475.00 ppb
2017-02-141225-034-09293.00 ppb
2017-02-211225-032-13305.00 ppb
2017-02-211225-033-1435ND
2017-02-211225-034-10203.00 ppb
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