Arsenic
Paramount Water Department
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 | 5.64 ppb | 35 | 35 | 4.50 ppb - 9.33 ppb |
2015 | 5.33 ppb | 30 | 30 | 3.86 ppb - 9.16 ppb |
2016 | 4.62 ppb | 39 | 39 | 3.61 ppb - 8.47 ppb |
2017 | 4.45 ppb | 42 | 41 | ND - 8.05 ppb |
2018 | 4.01 ppb | 39 | 39 | 2.80 ppb - 7.40 ppb |
2019 | 4.92 ppb | 26 | 26 | 3.25 ppb - 14.7 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 |
---|---|---|
2014-02-18 | 9469-016-1056 | 6.19 ppb |
2014-02-25 | 9469-024-1041 | 6.76 ppb |
2014-03-25 | 9469-024-1308 | 6.32 ppb |
2014-04-01 | 9469-024-1245 | 6.85 ppb |
2014-04-08 | 9469-024-1124 | 5.32 ppb |
2014-04-15 | 9469-016-1230 | 5.58 ppb |
2014-04-15 | 9469-024-1300 | 5.32 ppb |
2014-04-22 | 9469-024-1005 | 4.52 ppb |
2014-06-10 | 9469-024-1055 | 5.82 ppb |
2014-06-17 | 9469-016-0710 | 5.57 ppb |
2014-06-17 | 9469-024-0701 | 5.58 ppb |
2014-06-24 | 9469-024-0820 | 5.45 ppb |
2014-07-01 | 9469-024-0948 | 5.31 ppb |
2014-07-08 | 9469-024-0855 | 5.42 ppb |
2014-07-29 | 9588-016-0940 | 5.50 ppb |
2014-08-05 | 9469-024-1053 | 5.88 ppb |
2014-08-12 | 9469-024-1026 | 5.02 ppb |
2014-08-19 | 9469-016-1309 | 5.71 ppb |
2014-08-19 | 9469-024-1351 | 5.30 ppb |
2014-08-26 | 9469-024-1110 | 5.03 ppb |
2014-09-02 | 9469-024-1320 | 4.79 ppb |
2014-09-09 | 9469-024-1100 | 6.13 ppb |
2014-09-16 | 9469-016-0802 | 5.44 ppb |
2014-09-16 | 9469-024-1105 | 5.00 ppb |
2014-09-23 | 9469-024-1118 | 4.82 ppb |
2014-10-28 | 9469-024-0840 | 5.99 ppb |
2014-10-29 | 9588-024-0958 | 4.50 ppb |
2014-11-04 | 9469-024-1216 | 9.33 ppb |
2014-11-12 | 9469-024-1050 | 5.98 ppb |
2014-11-18 | 9469-016-1058 | 5.47 ppb |
2014-11-18 | 9469-024-1035 | 6.03 ppb |
2014-11-25 | 9469-024-0800 | 5.13 ppb |
2014-12-02 | 9469-024-1115 | 5.28 ppb |
2014-12-09 | 9469-024-1227 | 5.49 ppb |
2014-12-16 | 9469-024-1056 | 5.45 ppb |
2015-01-20 | 9469-024-1220 | 5.62 ppb |
2015-02-10 | 9469-024-1005 | 8.10 ppb |
2015-02-24 | 9469-024-1047 | 6.95 ppb |
2015-03-10 | 9469-024-0758 | 9.16 ppb |
2015-03-17 | 9469-024-1026 | 5.99 ppb |
2015-04-07 | 9469-024-0738 | 6.56 ppb |
2015-04-13 | 9469-024-1415 | 5.60 ppb |
2015-04-20 | 9469-024-1315 | 5.07 ppb |
2015-04-27 | 9469-024-1250 | 4.87 ppb |
2015-05-05 | 9469-024-1215 | 4.37 ppb |
2015-05-11 | 9469-024-0900 | 3.91 ppb |
2015-05-26 | 9469-024-1500 | 4.38 ppb |
2015-06-01 | 9469-024-1320 | 4.48 ppb |
2015-07-21 | 9469-024-1203 | 6.77 ppb |
2015-07-27 | 9469-024-1225 | 6.36 ppb |
2015-08-10 | 9469-024-1222 | 4.67 ppb |
2015-08-18 | 9469-016-1220 | 5.73 ppb |
2015-08-25 | 9469-024-1054 | 4.65 ppb |
2015-08-31 | 9469-024-1230 | 4.03 ppb |
2015-09-15 | 9469-024-1006 | 4.31 ppb |
2015-09-21 | 9469-024-0845 | 5.27 ppb |
2015-10-05 | 9469-024-0930 | 5.69 ppb |
2015-10-12 | 9469-024-1100 | 6.56 ppb |
2015-10-20 | 9469-024-1215 | 4.52 ppb |
2015-10-26 | 9469-024-1315 | 5.55 ppb |
2015-11-09 | 9469-024-1045 | 4.50 ppb |
2015-11-17 | 9469-024-1128 | 3.86 ppb |
2015-11-24 | 9469-024-1105 | 4.25 ppb |
2015-12-01 | 9469-024-1145 | 3.96 ppb |
2015-12-07 | 9469-024-1026 | 4.28 ppb |
2016-01-04 | 9469-024-1000 | 3.92 ppb |
2016-01-11 | 9469-024-1400 | 4.20 ppb |
2016-01-21 | 9469-024-1104 | 4.25 ppb |
2016-02-02 | 9469-024-1145 | 4.11 ppb |
2016-02-09 | 9469-024-1130 | 4.22 ppb |
2016-02-16 | 9469-024-1145 | 5.05 ppb |
2016-02-23 | 9469-024-1042 | 4.44 ppb |
2016-02-29 | 9469-024-0950 | 5.20 ppb |
2016-03-08 | 9469-024-0800 | 8.47 ppb |
2016-03-15 | 9469-024-0814 | 4.36 ppb |
2016-03-21 | 9469-024-0933 | 6.28 ppb |
2016-03-29 | 9469-024-0800 | 6.34 ppb |
2016-04-04 | 9469-024-0915 | 5.92 ppb |
2016-05-09 | 9469-024-1045 | 3.94 ppb |
2016-05-17 | 9469-024-1048 | 3.61 ppb |
2016-05-23 | 9469-024-1022 | 4.73 ppb |
2016-05-31 | 9469-024-0835 | 5.13 ppb |
2016-06-13 | 9469-024-1100 | 4.68 ppb |
2016-06-21 | 9469-024-1103 | 3.87 ppb |
2016-06-27 | 9469-024-1330 | 4.42 ppb |
2016-07-05 | 9469-024-1245 | 3.67 ppb |
2016-07-11 | 9469-024-1035 | 4.60 ppb |
2016-07-19 | 9469-024-1130 | 3.90 ppb |
2016-07-25 | 9469-024-1045 | 4.68 ppb |
2016-08-01 | 9469-024-0845 | 4.32 ppb |
2016-08-08 | 9469-024-1000 | 4.41 ppb |
2016-08-16 | 9469-024-1115 | 3.78 ppb |
2016-08-23 | 9469-024-0905 | 5.29 ppb |
2016-08-29 | 9469-024-0905 | 4.88 ppb |
2016-09-12 | 9469-024-1045 | 4.04 ppb |
2016-09-20 | 9469-024-1200 | 4.34 ppb |
2016-09-26 | 9469-024-1030 | 5.38 ppb |
2016-10-03 | 9469-024-1238 | 3.80 ppb |
2016-10-10 | 9469-024-1030 | 4.40 ppb |
2016-10-24 | 9469-024-1325 | 4.50 ppb |
2016-10-31 | 9469-024-1115 | 4.44 ppb |
2016-11-07 | 9469-024-1245 | 4.00 ppb |
2016-11-15 | 9469-024-1103 | 4.66 ppb |
2016-11-21 | 9469-024-1015 | 4.04 ppb |
2017-01-17 | 9469-024-1050 | 7.36 ppb |
2017-01-23 | 9469-024-0949 | 5.34 ppb |
2017-02-13 | 9469-024-0815 | 8.05 ppb |
2017-02-21 | 9469-024-1003 | 3.51 ppb |
2017-03-06 | 9469-024-1015 | 6.64 ppb |
2017-03-13 | 9469-024-1055 | 5.45 ppb |
2017-03-21 | 9469-024-0829 | 5.12 ppb |
2017-03-27 | 9469-024-0845 | 5.08 ppb |
2017-04-03 | 9469-024-1045 | ND |
2017-04-10 | 9469-024-0805 | 5.55 ppb |
2017-04-11 | 9469-024-0738 | 5.93 ppb |
2017-04-18 | 9469-024-1130 | 4.85 ppb |
2017-04-24 | 9469-024-1230 | 4.55 ppb |
2017-05-01 | 9469-024-0845 | 5.15 ppb |
2017-05-09 | 9469-024-1030 | 4.79 ppb |
2017-05-16 | 9469-024-1112 | 3.86 ppb |
2017-06-06 | 9469-024-1045 | 3.63 ppb |
2017-06-13 | 9469-024-0735 | 4.78 ppb |
2017-06-20 | 9469-024-1030 | 4.35 ppb |
2017-07-03 | 9588-016-1012 | 5.20 ppb |
2017-07-05 | 9469-024-1150 | 4.09 ppb |
2017-07-25 | 9469-024-0923 | 3.90 ppb |
2017-08-01 | 9469-024-0853 | 6.34 ppb |
2017-08-09 | 9469-024-1105 | 3.53 ppb |
2017-08-15 | 9469-024-1054 | 3.60 ppb |
2017-09-05 | 9469-024-1015 | 4.17 ppb |
2017-09-12 | 9469-024-1110 | 4.09 ppb |
2017-09-19 | 9469-024-1103 | 4.02 ppb |
2017-09-26 | 9469-024-1115 | 3.84 ppb |
2017-10-02 | 9588-024-1101 | 4.10 ppb |
2017-10-02 | 9469-024-1330 | 3.74 ppb |
2017-10-09 | 9469-024-1231 | 4.14 ppb |
2017-10-17 | 9469-024-1148 | 3.70 ppb |
2017-10-24 | 9469-024-1005 | 3.96 ppb |
2017-10-31 | 9469-024-1045 | 3.46 ppb |
2017-11-06 | 9469-024-1330 | 3.91 ppb |
2017-11-14 | 9469-024-0815 | 3.57 ppb |
2017-11-21 | 9469-024-1101 | 3.62 ppb |
2017-11-28 | 9469-024-1115 | 3.99 ppb |
2017-12-04 | 9469-024-1315 | 4.13 ppb |
2017-12-12 | 9469-024-1047 | 4.07 ppb |
2017-12-19 | 9469-024-1109 | 3.59 ppb |
2018-01-02 | 9469-024-0800 | 4.71 ppb |
2018-01-08 | 9469-024-1015 | 5.06 ppb |
2018-01-16 | 9469-024-1111 | 3.39 ppb |
2018-01-23 | 9469-024-1023 | 3.65 ppb |
2018-01-29 | 9469-024-0800 | 5.44 ppb |
2018-02-05 | 9469-024-1116 | 3.85 ppb |
2018-02-13 | 9469-024-0715 | 7.26 ppb |
2018-02-20 | 9469-024-1252 | 7.40 ppb |
2018-02-27 | 9469-024-0900 | 6.85 ppb |
2018-03-06 | 9469-024-1130 | 3.34 ppb |
2018-03-13 | 9469-024-1045 | 3.63 ppb |
2018-03-20 | 9469-024-1113 | 3.54 ppb |
2018-03-27 | 9469-024-1201 | 3.85 ppb |
2018-04-03 | 9469-024-0815 | 2.80 ppb |
2018-04-17 | 9469-024-1055 | 3.52 ppb |
2018-05-22 | 9469-024-1016 | 3.21 ppb |
2018-07-10 | 9469-024-0900 | 5.92 ppb |
2018-07-17 | 9469-024-1221 | 3.70 ppb |
2018-07-31 | 9469-024-1144 | 3.63 ppb |
2018-08-01 | 9469-024-1223 | 3.52 ppb |
2018-08-07 | 9469-024-0905 | 3.65 ppb |
2018-08-13 | 9469-024-1110 | 3.86 ppb |
2018-08-21 | 9469-024-1200 | 4.23 ppb |
2018-08-28 | 9469-024-1015 | 3.76 ppb |
2018-09-04 | 9469-024-1100 | 3.74 ppb |
2018-09-11 | 9469-024-0830 | 3.43 ppb |
2018-09-18 | 9469-024-1120 | 3.23 ppb |
2018-09-25 | 9469-024-1030 | 3.79 ppb |
2018-10-02 | 9469-024-1130 | 3.37 ppb |
2018-10-09 | 9469-024-1127 | 3.44 ppb |
2018-10-16 | 9469-024-1005 | 3.19 ppb |
2018-10-23 | 9469-024-0845 | 3.55 ppb |
2018-10-30 | 9469-024-1035 | 3.72 ppb |
2018-11-06 | 9469-024-1040 | 3.38 ppb |
2018-11-13 | 9469-024-0853 | 3.30 ppb |
2018-11-20 | 9469-024-1038 | 3.23 ppb |
2018-11-27 | 9469-024-1115 | 3.76 ppb |
2018-12-11 | 9469-024-1015 | 3.40 ppb |
2018-12-18 | 9469-024-1112 | 4.23 ppb |
2019-01-08 | 9469-024-0915 | 7.22 ppb |
2019-01-15 | 9469-024-0825 | 6.55 ppb |
2019-02-11 | 9469-024-1005 | 4.13 ppb |
2019-02-19 | 9469-024-0924 | 3.33 ppb |
2019-03-05 | 9469-024-1205 | 3.25 ppb |
2019-03-12 | 9469-024-0825 | 4.79 ppb |
2019-03-19 | 9469-024-1103 | 3.76 ppb |
2019-04-02 | 9469-024-1045 | 3.79 ppb |
2019-04-09 | 9469-024-0900 | 4.20 ppb |
2019-04-16 | 9469-024-1120 | 4.35 ppb |
2019-05-06 | 9469-024-1305 | 3.96 ppb |
2019-05-28 | 9469-024-1038 | 4.94 ppb |
2019-06-03 | 9469-024-1005 | 4.90 ppb |
2019-06-18 | 9469-024-0915 | 5.20 ppb |
2019-07-08 | 9588-016-1030 | 5.60 ppb |
2019-08-12 | 9469-024-1015 | 4.44 ppb |
2019-08-27 | 9469-024-0845 | 14.7 ppb |
2019-09-17 | 9469-024-1113 | 3.87 ppb |
2019-10-15 | 9469-024-1110 | 4.08 ppb |
2019-10-22 | 9469-024-0800 | 3.77 ppb |
2019-11-04 | 9469-024-1015 | 4.25 ppb |
2019-11-04 | 9469-024-1037 | 7.06 ppb |
2019-11-12 | 9469-024-1030 | 4.24 ppb |
2019-11-19 | 9469-024-1136 | 4.00 ppb |
2019-12-03 | 9469-024-0800 | 3.60 ppb |
2019-12-17 | 9469-024-1102 | 3.97 ppb |