Bromochloroacetic acid
Helena Water System
Bromochloroacetic acid is formed when chlorine or other disinfectants are used to treat drinking water. Bromochloroacetic acid and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.
96
Samples
0
Samples exceeding legal limit (MCL)
91
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 | 3.73 ppb | 16 | 16 | 1.70 ppb - 5.70 ppb |
| 2015 | 1.66 ppb | 16 | 15 | ND - 4.00 ppb |
| 2016 | 1.69 ppb | 16 | 16 | 0.670 ppb - 4.60 ppb |
| 2017 | 2.23 ppb | 16 | 15 | ND - 4.10 ppb |
| 2018 | 1.50 ppb | 16 | 13 | ND - 3.30 ppb |
| 2019 | 1.86 ppb | 16 | 16 | 0.650 ppb - 3.80 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.02 ppb
The EWG Health Guideline of 0.02 ppb for bromochloroacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-18 | H14020182-004B | 1.80 ppb |
| 2014-02-18 | H14020182-003B | 1.80 ppb |
| 2014-02-18 | H14020182-002B | 1.70 ppb |
| 2014-02-18 | H14020182-001B | 2.10 ppb |
| 2014-05-06 | H14050080-004A | 3.80 ppb |
| 2014-05-06 | H14050080-003A | 4.70 ppb |
| 2014-05-06 | H14050080-002A | 4.50 ppb |
| 2014-05-06 | H14050080-001A | 4.40 ppb |
| 2014-08-07 | H14080149-002B | 4.10 ppb |
| 2014-08-07 | H14080149-001B | 5.70 ppb |
| 2014-08-07 | H14080149-003B | 4.50 ppb |
| 2014-08-07 | H14080149-004B | 3.60 ppb |
| 2014-11-11 | H14110156-004B | 5.20 ppb |
| 2014-11-11 | H14110156-003B | 3.40 ppb |
| 2014-11-11 | H14110156-002B | 4.30 ppb |
| 2014-11-11 | H14110156-001B | 4.10 ppb |
| 2015-02-09 | H15020132-004B | 0.960 ppb |
| 2015-02-09 | H15020132-003B | 1.10 ppb |
| 2015-02-09 | H15020132-002B | 0.980 ppb |
| 2015-02-09 | H15020132-001B | 0.930 ppb |
| 2015-05-04 | H15050032-001B | 2.10 ppb |
| 2015-05-04 | H15050032-002B | 1.20 ppb |
| 2015-05-04 | H15050032-004B | 1.40 ppb |
| 2015-05-04 | H15050032-003B | 1.20 ppb |
| 2015-08-04 | H15080039-004B | 3.20 ppb |
| 2015-08-04 | H15080039-003B | 2.70 ppb |
| 2015-08-04 | H15080039-002B | 3.90 ppb |
| 2015-08-04 | H15080039-001B | 4.00 ppb |
| 2015-11-11 | H15110206-004B | ND |
| 2015-11-11 | H15110206-003B | 1.30 ppb |
| 2015-11-11 | H15110206-002B | 0.750 ppb |
| 2015-11-11 | H15110206-001B | 0.850 ppb |
| 2016-02-08 | H16020112-002B | 1.000 ppb |
| 2016-02-08 | H16020112-001B | 1.10 ppb |
| 2016-02-08 | H16020112-003B | 1.000 ppb |
| 2016-02-08 | H16020112-004B | 1.30 ppb |
| 2016-05-04 | H16050062-004B | 0.800 ppb |
| 2016-05-04 | H16050062-003B | 1.20 ppb |
| 2016-05-04 | H16050062-002B | 1.40 ppb |
| 2016-05-04 | H16050062-001B | 1.90 ppb |
| 2016-08-11 | H16080311-004B | 0.770 ppb |
| 2016-08-11 | H16080311-003B | 3.60 ppb |
| 2016-08-11 | H16080311-002B | 4.50 ppb |
| 2016-08-11 | H16080311-001B | 4.60 ppb |
| 2016-11-07 | H16110141-001B | 0.940 ppb |
| 2016-11-07 | H16110141-004B | 0.670 ppb |
| 2016-11-07 | H16110141-003B | 1.20 ppb |
| 2016-11-07 | H16110141-002B | 1.000 ppb |
| 2017-02-06 | H17020059-004B | 1.30 ppb |
| 2017-02-06 | H17020059-003B | 1.30 ppb |
| 2017-02-06 | H17020059-002B | 1.20 ppb |
| 2017-02-06 | H17020059-001B | 1.40 ppb |
| 2017-05-10 | H17050211-004B | 1.30 ppb |
| 2017-05-10 | H17050211-003B | 1.20 ppb |
| 2017-05-10 | H17050211-002B | 3.30 ppb |
| 2017-05-10 | H17050211-001B | 0.880 ppb |
| 2017-08-16 | H17080330-002B | 3.90 ppb |
| 2017-08-16 | H17080330-001B | 4.10 ppb |
| 2017-08-16 | H17080330-003B | 3.90 ppb |
| 2017-08-16 | H17080330-004B | ND |
| 2017-11-28 | H17110486-004B | 2.60 ppb |
| 2017-11-28 | H17110486-003B | 3.00 ppb |
| 2017-11-28 | H17110486-002B | 2.70 ppb |
| 2017-11-28 | H17110486-001B | 3.60 ppb |
| 2018-02-15 | H18020260-004B | 1.10 ppb |
| 2018-02-15 | H18020260-003B | 1.10 ppb |
| 2018-02-15 | H18020260-002B | 1.20 ppb |
| 2018-02-15 | H18020260-001B | 1.40 ppb |
| 2018-05-09 | H18050233-001B | 2.80 ppb |
| 2018-05-09 | H18050233-002B | 2.60 ppb |
| 2018-05-09 | H18050233-004B | 2.70 ppb |
| 2018-05-09 | H18050233-003B | 2.40 ppb |
| 2018-08-14 | H18080291-004B | 1.10 ppb |
| 2018-08-14 | H18080291-003B | ND |
| 2018-08-14 | H18080291-002B | 3.20 ppb |
| 2018-08-14 | H18080291-001B | 3.30 ppb |
| 2018-11-14 | H18110336-004B | ND |
| 2018-11-14 | H18110336-003B | 0.520 ppb |
| 2018-11-14 | H18110336-002B | 0.510 ppb |
| 2018-11-14 | H18110336-001B | ND |
| 2019-02-06 | H19020065-002B | 0.790 ppb |
| 2019-02-06 | H19020065-001B | 0.830 ppb |
| 2019-02-06 | H19020065-003B | 0.870 ppb |
| 2019-02-06 | H19020065-004B | 1.30 ppb |
| 2019-05-23 | H19050678-004B | 1.40 ppb |
| 2019-05-23 | H19050678-003B | 1.50 ppb |
| 2019-05-23 | H19050678-002B | 2.80 ppb |
| 2019-05-23 | H19050678-001B | 0.650 ppb |
| 2019-08-20 | H19080561-004B | 2.50 ppb |
| 2019-08-20 | H19080561-003B | 3.80 ppb |
| 2019-08-20 | H19080561-002B | 3.70 ppb |
| 2019-08-20 | H19080561-001B | 3.80 ppb |
| 2019-11-13 | H19110258-001B | 2.30 ppb |
| 2019-11-13 | H19110258-004B | 0.670 ppb |
| 2019-11-13 | H19110258-003B | 1.50 ppb |
| 2019-11-13 | H19110258-002B | 1.40 ppb |