Dichloroacetic acid
U.S. Navy San Clemente Island
Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
340
Samples
0
Samples exceeding legal limit (MCL)
233
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 1.16 ppb | 60 | 34 | ND - 3.60 ppb |
| 2015 | 1.32 ppb | 60 | 39 | ND - 3.80 ppb |
| 2016 | 5.22 ppb | 45 | 37 | ND - 27.0 ppb |
| 2017 | 7.26 ppb | 55 | 49 | ND - 46.0 ppb |
| 2018 | 1.32 ppb | 60 | 38 | ND - 3.60 ppb |
| 2019 | 1.59 ppb | 60 | 36 | ND - 4.60 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.2 ppb
The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 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.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-22 | 9590-900-1010 | 2.80 ppb |
| 2014-01-22 | 9590-901-0645 | 1.60 ppb |
| 2014-01-22 | 9590-902-0825 | 3.40 ppb |
| 2014-01-22 | 9590-903-0730 | 3.60 ppb |
| 2014-01-22 | 9590-904-0925 | ND |
| 2014-02-12 | 9590-900-0915 | 2.30 ppb |
| 2014-02-12 | 9590-901-0855 | ND |
| 2014-02-12 | 9590-902-1010 | 2.80 ppb |
| 2014-02-12 | 9590-903-0940 | 2.50 ppb |
| 2014-02-12 | 9590-904-0820 | ND |
| 2014-03-12 | 9590-900-1120 | 1.40 ppb |
| 2014-03-12 | 9590-901-0955 | ND |
| 2014-03-12 | 9590-902-1100 | 1.50 ppb |
| 2014-03-12 | 9590-903-1030 | 2.60 ppb |
| 2014-03-12 | 9590-904-0930 | ND |
| 2014-04-08 | 9590-900-1505 | ND |
| 2014-04-08 | 9590-901-1445 | ND |
| 2014-04-08 | 9590-902-1605 | 1.30 ppb |
| 2014-04-08 | 9590-903-1530 | ND |
| 2014-04-09 | 9590-904-1110 | ND |
| 2014-05-14 | 9590-900-1000 | 2.40 ppb |
| 2014-05-14 | 9590-901-0655 | ND |
| 2014-05-14 | 9590-902-1020 | 2.50 ppb |
| 2014-05-14 | 9590-903-0740 | 2.60 ppb |
| 2014-05-14 | 9590-904-0845 | ND |
| 2014-06-11 | 9590-900-0700 | 1.20 ppb |
| 2014-06-11 | 9590-901-0620 | 2.30 ppb |
| 2014-06-11 | 9590-902-0945 | 2.50 ppb |
| 2014-06-11 | 9590-903-0905 | 2.40 ppb |
| 2014-06-11 | 9590-904-0745 | ND |
| 2014-07-15 | 9590-900-1515 | 2.20 ppb |
| 2014-07-15 | 9590-901-0740 | 2.20 ppb |
| 2014-07-15 | 9590-902-1435 | 2.60 ppb |
| 2014-07-15 | 9590-903-1150 | 2.90 ppb |
| 2014-07-16 | 9590-904-1045 | ND |
| 2014-08-12 | 9590-900-1510 | 1.40 ppb |
| 2014-08-12 | 9590-901-1540 | ND |
| 2014-08-12 | 9590-902-1450 | 1.60 ppb |
| 2014-08-12 | 9590-903-1415 | 1.90 ppb |
| 2014-08-13 | 9590-904-0945 | ND |
| 2014-09-08 | 9590-900-1000 | 1.60 ppb |
| 2014-09-08 | 9590-901-1025 | 1.40 ppb |
| 2014-09-08 | 9590-902-0840 | 1.80 ppb |
| 2014-09-08 | 9590-903-0920 | 1.80 ppb |
| 2014-09-10 | 9590-904-0950 | ND |
| 2014-10-21 | 9590-900-1320 | 1.20 ppb |
| 2014-10-21 | 9590-901-1350 | ND |
| 2014-10-21 | 9590-902-1015 | 1.40 ppb |
| 2014-10-21 | 9590-903-1245 | 1.40 ppb |
| 2014-10-22 | 9590-904-1010 | ND |
| 2014-11-13 | 9590-900-1005 | ND |
| 2014-11-13 | 9590-901-0905 | ND |
| 2014-11-13 | 9590-902-1145 | 1.30 ppb |
| 2014-11-13 | 9590-903-1240 | ND |
| 2014-11-13 | 9590-904-0935 | ND |
| 2014-12-16 | 9590-900-0955 | ND |
| 2014-12-16 | 9590-901-0830 | ND |
| 2014-12-16 | 9590-902-0940 | 1.10 ppb |
| 2014-12-16 | 9590-903-0910 | ND |
| 2014-12-17 | 9590-904-1010 | ND |
| 2015-01-27 | 9590-900-0955 | 1.30 ppb |
| 2015-01-27 | 9590-901-0940 | 1.40 ppb |
| 2015-01-27 | 9590-902-0830 | 1.30 ppb |
| 2015-01-27 | 9590-903-0750 | 1.50 ppb |
| 2015-01-28 | 9590-904-0745 | ND |
| 2015-02-10 | 9590-900-1050 | ND |
| 2015-02-10 | 9590-901-0910 | ND |
| 2015-02-10 | 9590-902-0830 | ND |
| 2015-02-10 | 9590-903-0810 | ND |
| 2015-02-11 | 9590-904-0845 | ND |
| 2015-03-10 | 9590-900-0955 | 1.10 ppb |
| 2015-03-10 | 9590-901-1015 | 1.20 ppb |
| 2015-03-10 | 9590-902-1105 | 1.20 ppb |
| 2015-03-10 | 9590-903-1045 | 1.30 ppb |
| 2015-03-10 | 9590-904-0935 | 1.10 ppb |
| 2015-04-13 | 9590-900-0745 | 2.40 ppb |
| 2015-04-13 | 9590-901-0810 | 2.70 ppb |
| 2015-04-13 | 9590-902-0700 | 2.40 ppb |
| 2015-04-13 | 9590-903-0620 | 2.90 ppb |
| 2015-04-13 | 9590-904-0930 | 1.10 ppb |
| 2015-05-19 | 9590-900-1050 | 3.80 ppb |
| 2015-05-19 | 9590-901-1035 | 3.70 ppb |
| 2015-05-19 | 9590-902-1010 | 2.80 ppb |
| 2015-05-19 | 9590-903-0940 | 3.20 ppb |
| 2015-05-20 | 9590-904-1150 | 2.10 ppb |
| 2015-06-09 | 9590-900-1655 | 1.60 ppb |
| 2015-06-09 | 9590-901-1640 | ND |
| 2015-06-09 | 9590-902-1620 | 1.80 ppb |
| 2015-06-09 | 9590-903-1545 | 2.00 ppb |
| 2015-06-10 | 9590-904-1230 | 1.30 ppb |
| 2015-07-08 | 9590-900-1318 | ND |
| 2015-07-08 | 9590-901-1300 | ND |
| 2015-07-08 | 9590-902-1235 | 1.80 ppb |
| 2015-07-08 | 9590-903-1211 | 2.00 ppb |
| 2015-07-08 | 9590-904-1248 | ND |
| 2015-08-05 | 9590-900-1146 | 2.40 ppb |
| 2015-08-05 | 9590-901-1203 | 2.50 ppb |
| 2015-08-05 | 9590-902-1128 | 2.70 ppb |
| 2015-08-05 | 9590-903-1054 | 2.70 ppb |
| 2015-08-05 | 9590-904-1935 | ND |
| 2015-09-16 | 9590-900-1310 | 2.70 ppb |
| 2015-09-16 | 9590-901-1337 | ND |
| 2015-09-16 | 9590-902-1248 | 1.60 ppb |
| 2015-09-16 | 9590-903-1215 | 1.60 ppb |
| 2015-09-16 | 9590-904-1346 | ND |
| 2015-10-14 | 9590-900-1020 | 2.40 ppb |
| 2015-10-14 | 9590-901-0945 | ND |
| 2015-10-14 | 9590-902-1040 | 2.80 ppb |
| 2015-10-14 | 9590-903-1120 | 2.60 ppb |
| 2015-10-14 | 9590-904-0925 | ND |
| 2015-11-18 | 9590-900-1120 | 1.40 ppb |
| 2015-11-18 | 9590-901-1104 | ND |
| 2015-11-18 | 9590-902-1140 | 1.80 ppb |
| 2015-11-18 | 9590-903-1207 | 1.50 ppb |
| 2015-11-18 | 9590-904-1055 | ND |
| 2015-12-16 | 9590-900-1140 | ND |
| 2015-12-16 | 9590-901-1112 | ND |
| 2015-12-16 | 9590-902-1200 | ND |
| 2015-12-16 | 9590-903-1230 | 1.30 ppb |
| 2015-12-16 | 9590-904-1530 | ND |
| 2016-01-13 | 9590-900-1100 | 1.30 ppb |
| 2016-01-13 | 9590-901-1042 | 1.40 ppb |
| 2016-01-13 | 9590-902-1120 | 1.50 ppb |
| 2016-01-13 | 9590-903-1155 | 1.60 ppb |
| 2016-01-14 | 9590-904-0900 | ND |
| 2016-02-04 | 9590-902-1630 | 1.20 ppb |
| 2016-02-04 | 9590-903-1300 | 1.10 ppb |
| 2016-02-05 | 9590-900-0940 | 1.000 ppb |
| 2016-02-05 | 9590-901-1010 | ND |
| 2016-02-10 | 9590-904-0900 | ND |
| 2016-03-05 | 9590-900-1515 | 1.30 ppb |
| 2016-03-05 | 9590-901-1645 | 1.50 ppb |
| 2016-03-05 | 9590-902-1430 | 1.30 ppb |
| 2016-03-05 | 9590-903-0920 | 1.40 ppb |
| 2016-03-10 | 9590-904-0900 | ND |
| 2016-04-01 | 9590-900-1250 | 2.00 ppb |
| 2016-04-01 | 9590-901-1430 | 1.70 ppb |
| 2016-04-01 | 9590-902-1220 | 3.10 ppb |
| 2016-04-01 | 9590-903-1115 | 1.90 ppb |
| 2016-04-07 | 9590-904-1015 | ND |
| 2016-05-11 | 9590-904-1125 | ND |
| 2016-05-12 | 9590-900-1535 | 1.40 ppb |
| 2016-05-12 | 9590-901-1555 | ND |
| 2016-05-12 | 9590-902-1450 | 1.30 ppb |
| 2016-05-12 | 9590-903-1240 | 1.20 ppb |
| 2016-07-05 | 9590-900-0840 | 1.40 ppb |
| 2016-07-05 | 9590-901-1005 | 1.20 ppb |
| 2016-07-05 | 9590-902-0820 | 1.90 ppb |
| 2016-07-05 | 9590-903-0920 | 2.40 ppb |
| 2016-07-06 | 9590-904-0915 | ND |
| 2016-08-22 | 9590-900-1010 | 3.80 ppb |
| 2016-08-22 | 9590-901-1035 | 3.80 ppb |
| 2016-08-22 | 9590-902-0955 | 4.40 ppb |
| 2016-08-22 | 9590-903-0900 | 4.00 ppb |
| 2016-08-24 | 9590-904-0910 | 2.50 ppb |
| 2016-10-23 | 9590-900-0920 | 12.0 ppb |
| 2016-10-23 | 9590-901-1030 | 17.0 ppb |
| 2016-10-23 | 9590-902-0757 | 13.0 ppb |
| 2016-10-23 | 9590-903-1000 | 13.0 ppb |
| 2016-10-26 | 9590-904-0930 | 2.10 ppb |
| 2016-11-08 | 9590-900-0826 | 23.0 ppb |
| 2016-11-08 | 9590-901-0800 | 25.0 ppb |
| 2016-11-08 | 9590-902-0721 | 25.0 ppb |
| 2016-11-08 | 9590-903-0705 | 27.0 ppb |
| 2016-11-09 | 9590-904-0905 | 25.0 ppb |
| 2017-01-16 | 9590-900-0745 | 18.0 ppb |
| 2017-01-16 | 9590-901-0935 | 9.50 ppb |
| 2017-01-16 | 9590-902-0710 | 18.0 ppb |
| 2017-01-16 | 9590-903-1005 | 18.0 ppb |
| 2017-01-18 | 9590-904-1030 | ND |
| 2017-02-04 | 9590-900-1310 | 3.60 ppb |
| 2017-02-04 | 9590-901-1215 | 3.20 ppb |
| 2017-02-04 | 9590-902-1415 | 10.00 ppb |
| 2017-02-04 | 9590-903-1500 | 12.0 ppb |
| 2017-02-08 | 9590-904-0845 | ND |
| 2017-03-05 | 9590-900-1435 | 2.50 ppb |
| 2017-03-05 | 9590-901-1550 | 1.90 ppb |
| 2017-03-05 | 9590-902-1200 | 4.00 ppb |
| 2017-03-05 | 9590-903-1500 | 5.10 ppb |
| 2017-03-08 | 9590-904-0805 | 1.40 ppb |
| 2017-04-02 | 9590-900-1510 | 6.10 ppb |
| 2017-04-02 | 9590-902-1430 | 6.90 ppb |
| 2017-04-03 | 9590-903-1610 | 6.30 ppb |
| 2017-04-04 | 9590-901-1145 | 6.50 ppb |
| 2017-04-05 | 9590-904-0745 | 1.80 ppb |
| 2017-05-08 | 9590-900-1315 | 18.0 ppb |
| 2017-05-08 | 9590-901-1100 | 16.0 ppb |
| 2017-05-08 | 9590-902-1020 | 16.0 ppb |
| 2017-05-08 | 9590-903-0930 | 16.0 ppb |
| 2017-05-10 | 9590-904-0830 | 16.0 ppb |
| 2017-07-03 | 9590-900-0801 | 28.0 ppb |
| 2017-07-03 | 9590-901-1217 | ND |
| 2017-07-03 | 9590-902-1141 | 1.20 ppb |
| 2017-07-03 | 9590-903-1110 | 20.0 ppb |
| 2017-07-06 | 9590-904-0910 | 46.0 ppb |
| 2017-08-07 | 9590-900-1300 | 9.50 ppb |
| 2017-08-07 | 9590-901-1115 | 9.60 ppb |
| 2017-08-07 | 9590-902-1330 | 9.00 ppb |
| 2017-08-07 | 9590-903-1410 | 9.40 ppb |
| 2017-08-09 | 9590-904-0900 | 6.00 ppb |
| 2017-09-04 | 9590-900-1135 | 3.10 ppb |
| 2017-09-04 | 9590-901-1150 | 3.00 ppb |
| 2017-09-04 | 9590-902-1116 | 2.90 ppb |
| 2017-09-04 | 9590-903-1000 | 3.00 ppb |
| 2017-09-06 | 9590-904-0740 | 2.70 ppb |
| 2017-10-01 | 9590-900-1005 | 1.60 ppb |
| 2017-10-01 | 9590-901-1020 | 2.10 ppb |
| 2017-10-01 | 9590-902-0940 | 2.00 ppb |
| 2017-10-01 | 9590-903-0850 | 2.40 ppb |
| 2017-10-03 | 9590-904-0910 | 2.10 ppb |
| 2017-11-03 | 9590-902-1135 | 3.20 ppb |
| 2017-11-03 | 9590-903-1045 | 3.20 ppb |
| 2017-11-04 | 9590-900-1345 | 3.00 ppb |
| 2017-11-04 | 9590-901-1410 | 2.80 ppb |
| 2017-11-08 | 9590-904-1030 | ND |
| 2017-12-01 | 9590-900-1015 | 2.20 ppb |
| 2017-12-01 | 9590-901-1445 | ND |
| 2017-12-01 | 9590-902-1300 | 2.10 ppb |
| 2017-12-01 | 9590-903-1100 | 2.30 ppb |
| 2017-12-06 | 9590-904-0805 | ND |
| 2018-01-08 | 9590-900-0955 | 2.70 ppb |
| 2018-01-08 | 9590-901-1015 | 2.10 ppb |
| 2018-01-08 | 9590-902-0935 | 3.60 ppb |
| 2018-01-08 | 9590-903-0720 | 3.20 ppb |
| 2018-01-11 | 9590-904-0930 | ND |
| 2018-02-04 | 5810-900-0920 | 2.80 ppb |
| 2018-02-04 | 5810-901-0910 | 2.80 ppb |
| 2018-02-04 | 5810-902-0830 | 2.70 ppb |
| 2018-02-04 | 5810-903-0800 | 2.70 ppb |
| 2018-02-06 | 5810-904-0810 | ND |
| 2018-03-06 | 5810-900-0935 | 2.30 ppb |
| 2018-03-06 | 5810-901-0755 | 2.40 ppb |
| 2018-03-06 | 5810-902-0910 | 2.60 ppb |
| 2018-03-06 | 5810-903-0835 | 3.40 ppb |
| 2018-03-06 | 5810-904-0802 | 1.30 ppb |
| 2018-04-02 | 5810-900-0930 | 2.40 ppb |
| 2018-04-02 | 5810-901-0850 | 2.40 ppb |
| 2018-04-02 | 5810-902-0815 | 2.50 ppb |
| 2018-04-02 | 5810-903-0740 | 2.50 ppb |
| 2018-04-04 | 5810-904-0900 | 2.40 ppb |
| 2018-05-03 | 5810-900-1230 | 2.40 ppb |
| 2018-05-03 | 5810-901-1520 | 1.10 ppb |
| 2018-05-03 | 5810-902-1440 | 3.10 ppb |
| 2018-05-03 | 5810-903-1355 | 2.60 ppb |
| 2018-05-09 | 5810-904-0810 | ND |
| 2018-06-03 | 5810-900-1100 | 1.10 ppb |
| 2018-06-03 | 5810-901-1010 | 1.30 ppb |
| 2018-06-03 | 5810-902-1120 | 2.10 ppb |
| 2018-06-03 | 5810-903-0930 | 2.20 ppb |
| 2018-06-06 | 5810-904-0810 | ND |
| 2018-07-09 | 5810-900-1630 | ND |
| 2018-07-09 | 5810-901-1645 | ND |
| 2018-07-09 | 5810-902-1550 | 1.60 ppb |
| 2018-07-09 | 5810-903-1515 | 1.40 ppb |
| 2018-07-09 | 5810-904-0900 | ND |
| 2018-08-08 | 5810-900-0730 | ND |
| 2018-08-08 | 5810-901-0850 | ND |
| 2018-08-08 | 5810-902-0750 | 1.60 ppb |
| 2018-08-08 | 5810-903-0850 | 1.30 ppb |
| 2018-08-08 | 5810-904-0900 | ND |
| 2018-09-04 | 5810-900-0940 | ND |
| 2018-09-04 | 5810-901-1005 | ND |
| 2018-09-04 | 5810-902-0910 | 1.40 ppb |
| 2018-09-04 | 5810-903-0845 | 1.30 ppb |
| 2018-09-05 | 5810-904-0730 | ND |
| 2018-10-02 | 5810-900-0845 | ND |
| 2018-10-02 | 5810-901-0915 | ND |
| 2018-10-02 | 5810-902-0820 | 1.50 ppb |
| 2018-10-02 | 5810-903-0725 | 1.20 ppb |
| 2018-10-03 | 5810-904-0730 | ND |
| 2018-11-05 | 5810-900-1610 | 1.10 ppb |
| 2018-11-05 | 5810-901-1550 | 1.10 ppb |
| 2018-11-05 | 5810-902-1530 | 1.50 ppb |
| 2018-11-05 | 5810-903-1455 | 1.20 ppb |
| 2018-11-05 | 5810-904-0710 | ND |
| 2018-12-01 | 5810-900-0955 | ND |
| 2018-12-01 | 5810-903-1400 | ND |
| 2018-12-01 | 5810-904-0930 | ND |
| 2018-12-13 | 5810-901-0920 | ND |
| 2018-12-13 | 5810-902-0905 | ND |
| 2019-01-02 | 5810-900-1515 | ND |
| 2019-01-02 | 5810-902-1455 | ND |
| 2019-01-02 | 5810-903-1415 | ND |
| 2019-01-03 | 5810-901-0655 | ND |
| 2019-01-03 | 5810-904-0730 | ND |
| 2019-02-12 | 5810-900-0855 | ND |
| 2019-02-12 | 5810-901-0910 | ND |
| 2019-02-12 | 5810-902-0830 | ND |
| 2019-02-12 | 5810-903-0715 | ND |
| 2019-02-27 | 5810-904-1230 | ND |
| 2019-03-05 | 5810-900-0715 | ND |
| 2019-03-05 | 5810-901-0735 | ND |
| 2019-03-05 | 5810-902-0655 | ND |
| 2019-03-05 | 5810-903-0625 | ND |
| 2019-03-06 | 5810-904-0715 | ND |
| 2019-04-08 | 5810-900-0830 | 1.000 ppb |
| 2019-04-08 | 5810-901-0730 | 1.10 ppb |
| 2019-04-08 | 5810-902-0715 | ND |
| 2019-04-08 | 5810-903-0755 | ND |
| 2019-04-11 | 5810-904-0725 | 3.50 ppb |
| 2019-05-14 | 5810-900-0815 | 4.60 ppb |
| 2019-05-14 | 5810-901-0845 | 4.20 ppb |
| 2019-05-14 | 5810-902-0755 | 2.90 ppb |
| 2019-05-14 | 5810-903-0715 | 2.80 ppb |
| 2019-05-15 | 5810-904-0720 | ND |
| 2019-06-03 | 5810-900-1015 | 3.00 ppb |
| 2019-06-03 | 5810-901-1300 | 1.50 ppb |
| 2019-06-03 | 5810-902-1030 | 4.10 ppb |
| 2019-06-03 | 5810-903-1100 | 4.60 ppb |
| 2019-06-05 | 5810-904-1230 | 1.10 ppb |
| 2019-07-01 | 5810-900-1410 | 3.30 ppb |
| 2019-07-01 | 5810-901-1430 | 3.30 ppb |
| 2019-07-01 | 5810-902-1345 | 3.90 ppb |
| 2019-07-01 | 5810-903-1315 | 2.40 ppb |
| 2019-07-02 | 5810-904-0805 | 2.70 ppb |
| 2019-08-05 | 5810-903-1635 | 4.60 ppb |
| 2019-08-06 | 5810-900-1425 | 2.00 ppb |
| 2019-08-06 | 5810-901-1510 | 1.80 ppb |
| 2019-08-06 | 5810-902-1230 | 3.10 ppb |
| 2019-08-07 | 5810-904-0715 | ND |
| 2019-09-10 | 5810-900-1355 | ND |
| 2019-09-10 | 5810-901-1415 | ND |
| 2019-09-10 | 5810-902-1300 | 1.50 ppb |
| 2019-09-10 | 5810-903-1327 | 1.60 ppb |
| 2019-09-10 | 5810-904-0830 | ND |
| 2019-10-08 | 5810-900-1055 | 1.50 ppb |
| 2019-10-08 | 5810-901-1025 | ND |
| 2019-10-08 | 5810-902-1035 | 1.50 ppb |
| 2019-10-08 | 5810-903-1010 | 1.10 ppb |
| 2019-10-08 | 5810-904-0925 | 1.40 ppb |
| 2019-11-04 | 5810-900-0950 | 2.10 ppb |
| 2019-11-04 | 5810-901-1100 | 2.20 ppb |
| 2019-11-04 | 5810-902-1010 | 2.60 ppb |
| 2019-11-04 | 5810-903-1035 | 2.30 ppb |
| 2019-11-04 | 5810-904-0745 | ND |
| 2019-12-06 | 5810-903-1000 | 3.70 ppb |
| 2019-12-07 | 5810-900-1410 | 4.10 ppb |
| 2019-12-07 | 5810-902-1140 | 3.50 ppb |
| 2019-12-10 | 5810-901-1635 | 2.80 ppb |
| 2019-12-11 | 5810-904-0810 | 2.20 ppb |