Bromoform
Waterloo Water Works
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.265 ppb | 2 | 1 | ND - 0.530 ppb |
| 2015 | 0.770 ppb | 2 | 2 | 0.730 ppb - 0.810 ppb |
| 2016 | 0.670 ppb | 2 | 2 | 0.520 ppb - 0.820 ppb |
| 2017 | 0.315 ppb | 2 | 1 | ND - 0.630 ppb |
| 2018 | 0.580 ppb | 2 | 2 | 0.510 ppb - 0.650 ppb |
| 2019 | 0.270 ppb | 2 | 1 | ND - 0.540 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as 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 |
|---|---|---|
| 2014-07-16 | 2065520 | 0.530 ppb |
| 2014-07-16 | 2065521 | ND |
| 2015-07-07 | 1G50517-01 | 0.810 ppb |
| 2015-07-07 | 1G50517-02 | 0.730 ppb |
| 2016-07-20 | 1G61634-01 | 0.820 ppb |
| 2016-07-20 | 1G61634-02 | 0.520 ppb |
| 2017-07-11 | 1G70795-01 | 0.630 ppb |
| 2017-07-11 | 1G70795-02 | ND |
| 2018-07-17 | 1G81536-01 | 0.650 ppb |
| 2018-07-17 | 1G81536-02 | 0.510 ppb |
| 2019-07-09 | 1G90864-01 | 0.540 ppb |
| 2019-07-09 | 1G90864-02 | ND |