Know Your Environment. Protect Your Health.

Bromoform

St John Water District 1

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.

 

136

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0538 ppb322ND - 0.860 ppb
2019ND320ND
20200.138 ppb164ND - 0.660 ppb
2021ND160ND
20220.0813 ppb244ND - 0.520 ppb
20230.396 ppb169ND - 1.000 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform is based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer, harm to reproduction and child development, and change to fetal growth and development .

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-06-1435398652001ND
2018-06-1435398652002ND
2018-06-1435398652003ND
2018-06-1435398652004ND
2018-06-1435398652001ND
2018-06-1435398652002ND
2018-06-1435398652003ND
2018-06-1435398652004ND
2018-09-06354161430010.860 ppb
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-09-06354161430010.860 ppb
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2019-03-1335454557001ND
2019-03-1335454557002ND
2019-03-1335454557003ND
2019-03-1335454557004ND
2019-03-1335454557001ND
2019-03-1335454557002ND
2019-03-1335454557003ND
2019-03-1335454557004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-09-1235497589001ND
2019-09-1235497589002ND
2019-09-1235497589003ND
2019-09-1235497589004ND
2019-09-1235497589001ND
2019-09-1235497589002ND
2019-09-1235497589003ND
2019-09-1235497589004ND
2019-12-0935517591001ND
2019-12-0935517591002ND
2019-12-0935517591003ND
2019-12-0935517591004ND
2019-12-0935517591001ND
2019-12-0935517591002ND
2019-12-0935517591003ND
2019-12-0935517591004ND
2020-03-1135537039001ND
2020-03-1135537039002ND
2020-03-1135537039003ND
2020-03-1135537039004ND
2020-06-1135556250001ND
2020-06-1135556250002ND
2020-06-1135556250003ND
2020-06-1135556250004ND
2020-09-03355756750010.660 ppb
2020-09-03355756750020.570 ppb
2020-09-03355756750030.350 ppb
2020-09-03355756750040.620 ppb
2020-12-1035598318001ND
2020-12-1035598318002ND
2020-12-1035598318003ND
2020-12-1035598318004ND
2021-03-1835620545001ND
2021-03-1935620545002ND
2021-03-1935620545003ND
2021-03-1935620545004ND
2021-06-3035644469001ND
2021-06-3035644469002ND
2021-06-3035644469003ND
2021-06-3035644469004ND
2021-09-2435667105001ND
2021-09-2435667105002ND
2021-09-2435667105003ND
2021-09-2435667105004ND
2021-12-2135686305001ND
2021-12-2135686305002ND
2021-12-2135686305003ND
2021-12-2135686305004ND
2022-03-1035702953001ND
2022-03-1035702953002ND
2022-03-1035702953003ND
2022-03-1035702953004ND
2022-06-0835725755001ND
2022-06-0835725755002ND
2022-06-0835725755003ND
2022-06-0835725755004ND
2022-06-08B2202689-001ND
2022-06-08B2202689-002ND
2022-06-08B2202689-003ND
2022-06-08B2202689-004ND
2022-07-2535734272001ND
2022-07-2535734272002ND
2022-07-2535734272003ND
2022-07-2535734272004ND
2022-09-0735745059001ND
2022-09-0735745059002ND
2022-09-0735745059003ND
2022-09-0735745059004ND
2022-12-01357634240010.470 ppb
2022-12-01357634240020.520 ppb
2022-12-01357634240030.470 ppb
2022-12-01357634240040.490 ppb
2023-03-1635786614001ND
2023-03-1635786614002ND
2023-03-1635786614003ND
2023-03-1635786614004ND
2023-06-2135808369001ND
2023-06-2135808369002ND
2023-06-21358083690030.350 ppb
2023-06-21358083690040.400 ppb
2023-09-18358284180011.000 ppb
2023-09-18358284180021.000 ppb
2023-09-18358284180030.970 ppb
2023-09-18358284180040.780 ppb
2023-12-2735850592001ND
2023-12-27358505920020.800 ppb
2023-12-27358505920030.500 ppb
2023-12-27358505920040.530 ppb