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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Metropolitan Utilities District

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

 

325

Samples

0

Samples exceeding legal limit (MCL)

140

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.396 ppb5821ND - 2.02 ppb
20150.585 ppb5225ND - 2.20 ppb
20160.795 ppb5332ND - 2.12 ppb
20170.544 ppb6133ND - 1.63 ppb
20180.253 ppb5017ND - 1.17 ppb
20190.219 ppb5114ND - 1.51 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
2014-01-08294497ND
2014-02-04283310ND
2014-02-042833111.64 ppb
2014-02-042833121.14 ppb
2014-02-04283313ND
2014-02-04283315ND
2014-02-04283321ND
2014-02-112876131.64 ppb
2014-02-112876151.28 ppb
2014-02-11287616ND
2014-02-112876171.16 ppb
2014-02-112876181.33 ppb
2014-02-112876191.38 ppb
2014-04-08293527ND
2014-05-05295280ND
2014-05-052952810.584 ppb
2014-05-05295282ND
2014-05-052952831.67 ppb
2014-05-05295284ND
2014-05-05295285ND
2014-05-052952862.02 ppb
2014-05-052952870.957 ppb
2014-05-05295288ND
2014-05-05295289ND
2014-05-052952901.04 ppb
2014-05-05295291ND
2014-05-123025991.56 ppb
2014-06-02294498ND
2014-07-08309807ND
2014-08-05311980ND
2014-08-05311981ND
2014-08-05311982ND
2014-08-05311983ND
2014-08-05311984ND
2014-08-05311985ND
2014-08-05311986ND
2014-08-05311987ND
2014-08-053119880.555 ppb
2014-08-053119890.504 ppb
2014-08-05311990ND
2014-08-05311991ND
2014-08-26311210ND
2014-08-263112120.751 ppb
2014-08-26311213ND
2014-08-26311214ND
2014-09-02324809ND
2014-11-03332925ND
2014-11-033329260.827 ppb
2014-11-03332927ND
2014-11-033329280.797 ppb
2014-11-03332929ND
2014-11-03332930ND
2014-11-03332931ND
2014-11-033329320.793 ppb
2014-11-03332933ND
2014-11-03332934ND
2014-11-033329350.829 ppb
2014-11-033329360.524 ppb
2015-02-023465491.91 ppb
2015-02-02346546ND
2015-02-023465470.567 ppb
2015-02-02346548ND
2015-02-02346550ND
2015-02-02346551ND
2015-02-023465521.86 ppb
2015-02-023465530.712 ppb
2015-02-02346554ND
2015-02-023465550.888 ppb
2015-02-023465560.641 ppb
2015-02-02346557ND
2015-04-073536651.93 ppb
2015-04-07353666ND
2015-04-07353667ND
2015-05-053617280.840 ppb
2015-05-05361729ND
2015-05-05361731ND
2015-05-053617321.49 ppb
2015-05-05361733ND
2015-05-053617360.848 ppb
2015-05-053617371.11 ppb
2015-05-05361738ND
2015-05-053617391.01 ppb
2015-05-053617301.35 ppb
2015-05-053617341.21 ppb
2015-05-05361735ND
2015-07-07371752ND
2015-08-03374544ND
2015-08-033745452.20 ppb
2015-08-03374547ND
2015-08-03374548ND
2015-08-033745492.10 ppb
2015-08-03374538ND
2015-08-033745390.860 ppb
2015-08-03374540ND
2015-08-033745411.60 ppb
2015-08-03374542ND
2015-08-03374543ND
2015-08-03374546ND
2015-11-043937071.10 ppb
2015-11-043937081.06 ppb
2015-11-04393709ND
2015-11-04393710ND
2015-11-043937111.41 ppb
2015-11-04393712ND
2015-11-043937130.572 ppb
2015-11-04393714ND
2015-11-04393715ND
2015-11-043937161.04 ppb
2015-11-043937171.45 ppb
2015-11-043937180.664 ppb
2016-02-011.73 ppb
2016-02-01ND
2016-02-011.02 ppb
2016-02-011.27 ppb
2016-02-012.12 ppb
2016-02-01ND
2016-02-011.48 ppb
2016-02-011.47 ppb
2016-02-011.50 ppb
2016-02-01ND
2016-02-011.46 ppb
2016-02-011.14 ppb
2016-04-04ND
2016-04-181.53 ppb
2016-04-18ND
2016-05-022.11 ppb
2016-05-021.12 ppb
2016-05-02ND
2016-05-02ND
2016-05-021.30 ppb
2016-05-02ND
2016-05-02ND
2016-05-020.623 ppb
2016-05-02ND
2016-05-02ND
2016-05-02ND
2016-05-021.22 ppb
2016-05-02ND
2016-07-25ND
2016-08-020.920 ppb
2016-08-020.543 ppb
2016-08-020.987 ppb
2016-08-02ND
2016-08-021.08 ppb
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-020.920 ppb
2016-08-02ND
2016-11-071.27 ppb
2016-11-070.970 ppb
2016-11-071.000 ppb
2016-11-071.84 ppb
2016-11-071.49 ppb
2016-11-070.990 ppb
2016-11-071.05 ppb
2016-11-070.940 ppb
2016-11-071.79 ppb
2016-11-071.77 ppb
2016-11-071.74 ppb
2016-11-071.75 ppb
2017-02-070.990 ppb
2017-02-071.13 ppb
2017-02-07ND
2017-02-071.13 ppb
2017-02-07ND
2017-02-071.03 ppb
2017-02-07ND
2017-02-071.10 ppb
2017-02-071.06 ppb
2017-02-07ND
2017-02-070.829 ppb
2017-02-07ND
2017-04-11ND
2017-04-11ND
2017-04-111.63 ppb
2017-04-11ND
2017-04-11ND
2017-04-171.43 ppb
2017-04-17ND
2017-05-021.40 ppb
2017-05-021.37 ppb
2017-05-021.52 ppb
2017-05-020.776 ppb
2017-05-02ND
2017-05-02ND
2017-05-02ND
2017-05-021.12 ppb
2017-05-021.49 ppb
2017-05-021.16 ppb
2017-05-150.546 ppb
2017-05-15ND
2017-06-05ND
2017-06-05ND
2017-06-05ND
2017-06-05ND
2017-06-05ND
2017-08-071.37 ppb
2017-08-07ND
2017-08-070.500 ppb
2017-08-07ND
2017-08-071.06 ppb
2017-08-070.530 ppb
2017-08-07ND
2017-08-071.29 ppb
2017-08-070.520 ppb
2017-08-070.860 ppb
2017-08-071.02 ppb
2017-08-070.500 ppb
2017-09-19ND
2017-11-07ND
2017-11-070.629 ppb
2017-11-07ND
2017-11-070.800 ppb
2017-11-07ND
2017-11-070.670 ppb
2017-11-070.520 ppb
2017-11-070.590 ppb
2017-11-071.36 ppb
2017-11-07ND
2017-11-071.27 ppb
2017-11-07ND
2018-02-065340890.940 ppb
2018-02-06534090ND
2018-02-06534091ND
2018-02-06534092ND
2018-02-065340930.680 ppb
2018-02-06534094ND
2018-02-065340951.17 ppb
2018-02-065340961.12 ppb
2018-02-065340970.700 ppb
2018-02-065340980.790 ppb
2018-02-065340990.890 ppb
2018-02-06534100ND
2018-05-07549814ND
2018-05-075498150.530 ppb
2018-05-07549816ND
2018-05-075498170.770 ppb
2018-05-07549818ND
2018-05-075498190.710 ppb
2018-05-07549820ND
2018-05-07549821ND
2018-05-075498220.640 ppb
2018-05-07549823ND
2018-05-07549824ND
2018-05-07549825ND
2018-05-14542539ND
2018-05-14542540ND
2018-08-08567019ND
2018-08-08567020ND
2018-08-085670210.540 ppb
2018-08-08567022ND
2018-08-08567023ND
2018-08-08567024ND
2018-08-08567025ND
2018-08-085670260.680 ppb
2018-08-08567027ND
2018-08-08567028ND
2018-08-08567029ND
2018-08-08567030ND
2018-11-065833740.732 ppb
2018-11-06583375ND
2018-11-065833760.580 ppb
2018-11-06583377ND
2018-11-065833780.620 ppb
2018-11-06583379ND
2018-11-065833800.550 ppb
2018-11-06583381ND
2018-11-06583382ND
2018-11-06583383ND
2018-11-06583384ND
2018-11-06583385ND
2019-02-055952360.693 ppb
2019-02-055952370.746 ppb
2019-02-05595238ND
2019-02-055952390.880 ppb
2019-02-05595240ND
2019-02-055952410.900 ppb
2019-02-05595242ND
2019-02-055952430.880 ppb
2019-02-055952440.900 ppb
2019-02-055952450.880 ppb
2019-02-05595246ND
2019-02-05595247ND
2019-04-02604245ND
2019-04-226048101.51 ppb
2019-05-07600564ND
2019-05-07600565ND
2019-05-07600566ND
2019-05-076005670.690 ppb
2019-05-07600568ND
2019-05-07600569ND
2019-05-07600570ND
2019-05-076005710.860 ppb
2019-05-07600572ND
2019-05-07600573ND
2019-05-07600574ND
2019-05-07600575ND
2019-06-10604811ND
2019-08-06622448ND
2019-08-06622449ND
2019-08-06622450ND
2019-08-06622451ND
2019-08-06622452ND
2019-08-06622453ND
2019-08-06622454ND
2019-08-06622455ND
2019-08-066224560.640 ppb
2019-08-06622457ND
2019-08-06622458ND
2019-08-06622459ND
2019-11-05644378ND
2019-11-05644379ND
2019-11-056443800.510 ppb
2019-11-056443810.590 ppb
2019-11-05644382ND
2019-11-05644383ND
2019-11-05644384ND
2019-11-05644385ND
2019-11-05644386ND
2019-11-056443870.510 ppb
2019-11-05644388ND
2019-11-05644389ND