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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

San Luis Obispo Water Department

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.

MORE ABOUT THIS CONTAMINANT

 

108

Samples

0

Samples exceeding legal limit (MCL)

68

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.49 ppb18181.30 ppb - 3.60 ppb
20152.28 ppb17171.80 ppb - 2.60 ppb
20161.67 ppb1712ND - 4.50 ppb
20170.305 ppb214ND - 1.70 ppb
20180.529 ppb175ND - 2.00 ppb
20191.72 ppb1812ND - 9.00 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
2014-02-115867-018-11301.70 ppb
2014-02-115867-019-11001.80 ppb
2014-02-115867-020-11101.80 ppb
2014-02-115867-021-10452.00 ppb
2014-05-125867-018-12152.30 ppb
2014-05-125867-019-11552.40 ppb
2014-05-125867-020-11452.30 ppb
2014-05-125867-021-11302.10 ppb
2014-06-105867-019-09302.00 ppb
2014-08-115867-018-13203.10 ppb
2014-08-115867-019-14153.10 ppb
2014-08-115867-020-14003.10 ppb
2014-08-115867-021-13403.20 ppb
2014-09-165867-011-13203.60 ppb
2014-11-135867-018-14001.30 ppb
2014-11-135867-019-14453.30 ppb
2014-11-135867-020-14303.20 ppb
2014-11-135867-021-13452.50 ppb
2015-02-125867-018-15201.80 ppb
2015-02-125867-019-14502.30 ppb
2015-02-125867-020-15052.50 ppb
2015-02-125867-021-15352.30 ppb
2015-05-145867-018-10501.90 ppb
2015-05-145867-019-10002.00 ppb
2015-05-145867-020-10151.80 ppb
2015-05-145867-021-10352.00 ppb
2015-08-125867-018-08402.50 ppb
2015-08-125867-019-09002.60 ppb
2015-08-125867-020-09152.60 ppb
2015-08-125867-021-08252.60 ppb
2015-09-295867-011-13152.30 ppb
2015-11-105867-018-12452.20 ppb
2015-11-105867-019-13152.50 ppb
2015-11-105867-020-13252.30 ppb
2015-11-105867-021-13002.50 ppb
2016-02-085867-018-15001.50 ppb
2016-02-085867-019-14351.50 ppb
2016-02-085867-020-14501.30 ppb
2016-02-085867-021-15201.30 ppb
2016-05-115867-018-15153.90 ppb
2016-05-115867-019-16003.20 ppb
2016-05-115867-020-15453.80 ppb
2016-05-115867-021-15304.50 ppb
2016-08-085867-018-14101.70 ppb
2016-08-085867-019-14402.00 ppb
2016-08-085867-020-14551.80 ppb
2016-08-085867-021-14251.90 ppb
2016-09-205867-011-0955ND
2016-11-145867-018-1500ND
2016-11-145867-019-1535ND
2016-11-145867-020-1525ND
2016-11-145867-021-1550ND
2017-02-155867-018-15501.60 ppb
2017-02-155867-019-16251.70 ppb
2017-02-155867-020-16151.70 ppb
2017-02-155867-021-16451.40 ppb
2017-05-105867-018-1510ND
2017-05-105867-019-1440ND
2017-05-105867-020-1450ND
2017-05-105867-021-1525ND
2017-07-105867-018-1045ND
2017-07-105867-019-1015ND
2017-07-105867-020-1025ND
2017-07-105867-021-1105ND
2017-08-145867-018-1050ND
2017-08-145867-019-1020ND
2017-08-145867-020-1030ND
2017-08-145867-021-1100ND
2017-09-115867-011-1302ND
2017-11-075867-018-1540ND
2017-11-075867-019-1525ND
2017-11-075867-020-1515ND
2017-11-075867-021-1555ND
2018-02-145867-018-1505ND
2018-02-145867-019-1435ND
2018-02-145867-020-1450ND
2018-02-145867-021-1520ND
2018-05-085867-018-1435ND
2018-05-085867-019-1405ND
2018-05-085867-020-1415ND
2018-05-085867-021-1450ND
2018-08-105867-018-1245ND
2018-08-105867-019-1315ND
2018-08-105867-020-1330ND
2018-08-105867-021-1225ND
2018-09-065867-011-14201.000 ppb
2018-11-145867-018-14152.00 ppb
2018-11-145867-019-13302.00 ppb
2018-11-145867-020-13452.00 ppb
2018-11-145867-021-14002.00 ppb
2019-02-125867-018-11552.00 ppb
2019-02-125867-019-11101.000 ppb
2019-02-125867-020-11151.000 ppb
2019-02-125867-021-11402.00 ppb
2019-05-165867-006-1330ND
2019-05-165867-018-14001.000 ppb
2019-05-165867-019-12151.000 ppb
2019-05-165867-020-12301.000 ppb
2019-05-165867-021-12502.00 ppb
2019-08-135867-018-1518ND
2019-08-135867-019-1430ND
2019-08-135867-020-1440ND
2019-08-135867-021-1500ND
2019-09-095867-011-1347ND
2019-11-125867-018-14453.00 ppb
2019-11-125867-019-13555.00 ppb
2019-11-125867-020-14103.00 ppb
2019-11-125867-021-14309.00 ppb