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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

City of Modesto

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

 

503

Samples

0

Samples exceeding legal limit (MCL)

120

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.849 ppb9332ND - 3.26 ppb
20151.11 ppb8739ND - 4.50 ppb
20160.473 ppb7916ND - 4.47 ppb
20170.234 ppb10212ND - 5.30 ppb
20180.272 ppb7210ND - 6.67 ppb
20190.541 ppb7011ND - 10.00 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
2014-01-081610-051-1142ND
2014-01-081610-146-0910ND
2014-02-121610-166-0900ND
2014-02-261610-166-0805ND
2014-03-051610-018-10252.00 ppb
2014-03-111610-901-08252.14 ppb
2014-03-111610-906-1100ND
2014-03-121610-166-1125ND
2014-03-181610-902-1156ND
2014-03-181610-903-13202.86 ppb
2014-03-181610-905-1247ND
2014-03-181610-907-08401.87 ppb
2014-03-251610-900-1035ND
2014-03-251610-904-08201.60 ppb
2014-03-261610-166-0800ND
2014-04-091610-003-11352.60 ppb
2014-04-091610-008-13252.20 ppb
2014-04-091610-009-12402.40 ppb
2014-06-041610-078-0930ND
2014-06-101610-901-12252.63 ppb
2014-06-101610-906-1235ND
2014-06-171610-902-1140ND
2014-06-171610-903-13252.23 ppb
2014-06-171610-905-12552.15 ppb
2014-06-171610-907-1040ND
2014-06-241610-900-10301.68 ppb
2014-06-241610-904-10502.49 ppb
2014-07-021610-078-0945ND
2014-07-021610-151-1110ND
2014-07-091610-003-1400ND
2014-07-091610-008-1305ND
2014-07-091610-009-13302.80 ppb
2014-07-091610-166-1138ND
2014-08-061610-078-0945ND
2014-08-131610-166-0835ND
2014-09-031610-035-0820ND
2014-09-031610-124-1230ND
2014-09-031610-147-1051ND
2014-09-031610-149-10122.40 ppb
2014-09-031610-154-12492.10 ppb
2014-09-091610-901-07453.26 ppb
2014-09-091610-906-1010ND
2014-09-101610-012-07402.70 ppb
2014-09-101610-031-0836ND
2014-09-101610-070-0752ND
2014-09-101610-130-0750ND
2014-09-101610-132-1220ND
2014-09-101610-133-1334ND
2014-09-101610-135-1205ND
2014-09-101610-137-0925ND
2014-09-101610-166-1005ND
2014-09-101610-172-08502.80 ppb
2014-09-101610-185-0955ND
2014-09-101610-187-09402.60 ppb
2014-09-101610-189-0915ND
2014-09-101610-196-0918ND
2014-09-161610-902-08163.05 ppb
2014-09-161610-903-10002.74 ppb
2014-09-161610-905-07352.60 ppb
2014-09-161610-907-09202.56 ppb
2014-09-171610-169-1211ND
2014-09-171610-170-1020ND
2014-09-171610-171-09202.30 ppb
2014-09-171610-186-1039ND
2014-09-171610-191-1128ND
2014-09-171610-193-1005ND
2014-09-181610-043-1335ND
2014-09-181610-047-1320ND
2014-09-181610-048-1010ND
2014-09-181610-062-0940ND
2014-09-181610-068-0910ND
2014-09-181610-097-1245ND
2014-09-181610-127-1400ND
2014-09-181610-234-1100ND
2014-09-231610-900-10142.82 ppb
2014-09-231610-904-08153.12 ppb
2014-10-011610-044-10002.40 ppb
2014-10-011610-078-0945ND
2014-10-081610-003-0740ND
2014-10-081610-009-0800ND
2014-10-081610-166-0920ND
2014-11-051610-078-0920ND
2014-11-131610-166-1015ND
2014-12-031610-078-1010ND
2014-12-091610-901-10302.46 ppb
2014-12-091610-906-1107ND
2014-12-161610-166-0755ND
2014-12-161610-902-1110ND
2014-12-161610-903-11502.58 ppb
2014-12-161610-905-13002.28 ppb
2014-12-161610-907-10212.51 ppb
2014-12-221610-904-1026ND
2014-12-231610-900-1250ND
2015-01-071610-078-0940ND
2015-01-071610-148-10382.00 ppb
2015-01-141610-003-08102.00 ppb
2015-01-141610-009-08352.20 ppb
2015-01-141610-166-0913ND
2015-02-041610-078-0940ND
2015-02-041610-243-08302.10 ppb
2015-02-111610-166-1050ND
2015-03-041610-018-11502.70 ppb
2015-03-041610-045-0915ND
2015-03-041610-050-1015ND
2015-03-041610-053-1250ND
2015-03-041610-078-1050ND
2015-03-041610-239-09503.30 ppb
2015-03-041610-241-11102.70 ppb
2015-03-101610-901-11191.69 ppb
2015-03-101610-906-1015ND
2015-03-111610-041-1315ND
2015-03-111610-129-1345ND
2015-03-111610-131-0840ND
2015-03-111610-166-0930ND
2015-03-111610-221-1055ND
2015-03-171610-902-09152.86 ppb
2015-03-171610-903-11302.80 ppb
2015-03-171610-905-07502.72 ppb
2015-03-171610-907-11002.61 ppb
2015-03-181610-226-1025ND
2015-03-241610-900-0930ND
2015-03-241610-904-07052.80 ppb
2015-03-251610-008-0718ND
2015-04-081610-003-08002.00 ppb
2015-04-081610-008-08502.10 ppb
2015-04-081610-009-08254.00 ppb
2015-04-081610-078-0810ND
2015-04-081610-166-0935ND
2015-05-061610-061-10352.00 ppb
2015-05-061610-078-0915ND
2015-05-141610-166-1020ND
2015-06-031610-078-0945ND
2015-06-091610-901-09202.62 ppb
2015-06-091610-906-12001.49 ppb
2015-06-101610-166-1107ND
2015-06-161610-902-09403.83 ppb
2015-06-161610-903-10201.64 ppb
2015-06-161610-905-10051.50 ppb
2015-06-161610-907-1123ND
2015-06-231610-900-09252.03 ppb
2015-06-231610-904-10102.08 ppb
2015-07-011610-078-0940ND
2015-07-081610-003-09002.70 ppb
2015-07-081610-009-0816ND
2015-07-081610-166-0725ND
2015-07-151610-049-0840ND
2015-08-051610-078-0940ND
2015-08-121610-166-0825ND
2015-09-021610-078-0935ND
2015-09-081610-901-08021.42 ppb
2015-09-081610-906-0950ND
2015-09-091610-166-08521.40 ppb
2015-09-151610-902-1032ND
2015-09-151610-903-14101.51 ppb
2015-09-151610-905-1130ND
2015-09-151610-907-1050ND
2015-09-221610-900-09242.86 ppb
2015-09-221610-904-09102.84 ppb
2015-09-301610-165-0910ND
2015-09-301610-191-0902ND
2015-10-071610-078-1025ND
2015-10-141610-003-09523.10 ppb
2015-10-141610-008-08582.90 ppb
2015-10-141610-009-08244.50 ppb
2015-10-141610-166-1117ND
2015-11-041610-078-1000ND
2015-11-091610-166-11451.70 ppb
2015-12-021610-078-0940ND
2015-12-081610-901-09102.60 ppb
2015-12-081610-906-1005ND
2015-12-091610-166-0845ND
2015-12-151610-003-10203.05 ppb
2015-12-151610-902-1055ND
2015-12-151610-905-1130ND
2015-12-151610-907-09352.77 ppb
2015-12-161610-078-0835ND
2015-12-161610-166-0830ND
2015-12-221610-900-09302.79 ppb
2015-12-221610-904-11052.92 ppb
2015-12-301610-078-0815ND
2016-01-061610-078-0805ND
2016-01-131610-003-09002.50 ppb
2016-01-131610-008-10071.90 ppb
2016-01-271610-078-0745ND
2016-02-031610-078-1030ND
2016-02-101610-009-11203.50 ppb
2016-02-171610-078-1419ND
2016-02-251610-166-1025ND
2016-03-021610-018-1315ND
2016-03-021610-078-1015ND
2016-03-081610-901-13221.86 ppb
2016-03-081610-906-08451.28 ppb
2016-03-091610-166-1120ND
2016-03-151610-902-13072.26 ppb
2016-03-151610-903-11001.90 ppb
2016-03-151610-905-07402.23 ppb
2016-03-151610-907-10102.13 ppb
2016-03-161610-078-0850ND
2016-03-221610-900-10101.21 ppb
2016-03-221610-904-08481.64 ppb
2016-04-061610-078-0935ND
2016-04-131610-003-14283.40 ppb
2016-04-131610-008-13372.00 ppb
2016-04-131610-009-13581.80 ppb
2016-04-131610-166-1300ND
2016-05-041610-078-0945ND
2016-05-111610-166-1150ND
2016-05-181610-027-0715ND
2016-06-011610-078-0935ND
2016-06-081610-166-1300ND
2016-06-141610-901-10153.29 ppb
2016-06-141610-906-0925ND
2016-06-211610-902-0755ND
2016-06-211610-903-1255ND
2016-06-211610-905-0730ND
2016-06-211610-907-1040ND
2016-06-281610-900-0830ND
2016-06-281610-904-1129ND
2016-07-061610-078-0950ND
2016-07-061610-151-1035ND
2016-07-131610-003-1237ND
2016-07-131610-008-0910ND
2016-07-131610-009-0815ND
2016-07-131610-166-1002ND
2016-08-031610-078-0925ND
2016-08-171610-166-0818ND
2016-09-081610-078-1015ND
2016-09-131610-901-1430ND
2016-09-131610-906-0930ND
2016-09-141610-032-0850ND
2016-09-141610-132-0950ND
2016-09-141610-134-1112ND
2016-09-141610-136-1029ND
2016-09-141610-166-0817ND
2016-09-201610-902-1210ND
2016-09-201610-903-1050ND
2016-09-201610-905-1300ND
2016-09-201610-907-1015ND
2016-09-211610-042-1024ND
2016-09-211610-115-1100ND
2016-09-271610-904-08534.47 ppb
2016-09-291610-900-1008ND
2016-10-051610-078-0950ND
2016-10-121610-003-0810ND
2016-10-121610-008-0950ND
2016-10-121610-009-0815ND
2016-10-121610-166-1200ND
2016-11-021610-078-1015ND
2016-11-091610-166-1405ND
2016-12-071610-078-0950ND
2016-12-131610-901-0955ND
2016-12-131610-906-1150ND
2016-12-141610-166-1033ND
2016-12-201610-902-1313ND
2016-12-201610-903-1155ND
2016-12-201610-905-0730ND
2016-12-201610-907-1025ND
2016-12-271610-900-0855ND
2016-12-271610-904-0844ND
2017-01-041610-078-0955ND
2017-01-041610-146-0958ND
2017-01-111610-008-1050ND
2017-01-111610-009-1010ND
2017-01-181610-166-1100ND
2017-02-011610-078-0955ND
2017-02-081610-166-1140ND
2017-03-011610-018-1215ND
2017-03-011610-078-1025ND
2017-03-031644-245-1300ND
2017-03-081610-166-1105ND
2017-03-141610-900-1147ND
2017-03-141610-901-1415ND
2017-03-141610-902-0950ND
2017-03-141610-903-1213ND
2017-03-141610-904-0931ND
2017-03-141610-905-0912ND
2017-03-141610-906-0750ND
2017-03-141610-907-1122ND
2017-03-211610-902-1155ND
2017-03-211610-903-0945ND
2017-03-211610-905-1230ND
2017-03-211610-907-0735ND
2017-04-051610-078-0930ND
2017-04-121610-008-0850ND
2017-04-121610-009-0800ND
2017-04-121610-166-1000ND
2017-05-031610-078-0855ND
2017-05-311610-166-1005ND
2017-06-071610-078-0910ND
2017-06-071610-146-0735ND
2017-06-131610-901-0940ND
2017-06-131610-906-0920ND
2017-06-141610-166-1035ND
2017-06-201610-902-1058ND
2017-06-201610-903-1200ND
2017-06-201610-905-0730ND
2017-06-201610-907-0915ND
2017-06-271610-900-1020ND
2017-06-271610-904-10512.58 ppb
2017-07-051610-078-0915ND
2017-07-111610-008-0950ND
2017-07-111610-009-0920ND
2017-07-111610-166-1200ND
2017-08-021610-044-0840ND
2017-08-021610-078-0910ND
2017-08-251610-003-1045ND
2017-08-251610-166-1120ND
2017-09-065867-035-08351.80 ppb
2017-09-065867-044-09251.10 ppb
2017-09-061610-061-11501.20 ppb
2017-09-061610-078-0930ND
2017-09-065867-124-08101.10 ppb
2017-09-065867-147-1105ND
2017-09-065867-149-08301.10 ppb
2017-09-121610-901-1035ND
2017-09-121610-906-0750ND
2017-09-131610-012-0740ND
2017-09-131610-031-0835ND
2017-09-131610-070-0850ND
2017-09-131610-130-1230ND
2017-09-131610-133-1335ND
2017-09-131610-135-13101.60 ppb
2017-09-131610-137-1113ND
2017-09-131610-166-0840ND
2017-09-131610-172-1015ND
2017-09-131610-187-0900ND
2017-09-131610-189-0940ND
2017-09-131610-196-0815ND
2017-09-191610-900-1003ND
2017-09-191610-902-1133ND
2017-09-191610-903-1146ND
2017-09-191610-904-12551.31 ppb
2017-09-191610-905-1206ND
2017-09-191610-907-1301ND
2017-09-205867-043-1030ND
2017-09-205867-047-0930ND
2017-09-205867-048-0900ND
2017-09-205867-062-0845ND
2017-09-205867-068-0820ND
2017-09-205867-097-1100ND
2017-09-205867-127-1045ND
2017-09-205867-170-09285.30 ppb
2017-09-205867-191-0958ND
2017-10-041610-078-0900ND
2017-10-111610-003-1030ND
2017-10-111610-008-0850ND
2017-10-111610-009-08352.60 ppb
2017-10-111610-051-1010ND
2017-10-111610-166-0925ND
2017-11-011610-078-0940ND
2017-11-081610-166-0925ND
2017-12-061610-078-0940ND
2017-12-121610-901-09372.86 ppb
2017-12-121610-906-0940ND
2017-12-131610-166-1055ND
2017-12-191610-902-0822ND
2017-12-191610-903-0930ND
2017-12-191610-905-0755ND
2017-12-191610-907-1100ND
2017-12-271610-900-0855ND
2017-12-271610-904-08391.36 ppb
2018-01-041610-148-0905ND
2018-01-091610-003-13502.20 ppb
2018-01-091610-008-0950ND
2018-01-091610-009-0920ND
2018-01-091610-165-1150ND
2018-01-241610-078-0740ND
2018-02-071610-078-0945ND
2018-02-071610-243-09301.20 ppb
2018-02-141610-166-1020ND
2018-03-071610-045-0930ND
2018-03-071610-050-0920ND
2018-03-071610-053-1000ND
2018-03-071610-078-1055ND
2018-03-071610-241-1045ND
2018-03-131610-901-0720ND
2018-03-131610-906-1130ND
2018-03-141610-041-0950ND
2018-03-141610-129-1030ND
2018-03-141610-166-0810ND
2018-03-141610-221-0804ND
2018-03-201610-902-0943ND
2018-03-201610-903-0935ND
2018-03-201610-905-1015ND
2018-03-201610-907-0730ND
2018-03-211610-018-0845ND
2018-03-211610-131-1148ND
2018-03-211610-226-1045ND
2018-03-271610-900-0830ND
2018-03-271610-904-1020ND
2018-04-041610-078-1205ND
2018-04-111610-003-13401.70 ppb
2018-04-111610-008-1100ND
2018-04-111610-009-10051.20 ppb
2018-04-111610-166-1230ND
2018-05-021610-078-0945ND
2018-06-061610-078-1020ND
2018-06-121610-901-09406.67 ppb
2018-06-121610-906-0915ND
2018-06-191610-902-0745ND
2018-06-191610-903-0945ND
2018-06-191610-905-0720ND
2018-06-191610-907-1010ND
2018-06-261610-900-0855ND
2018-06-261610-904-08301.51 ppb
2018-07-051610-078-1234ND
2018-07-111610-003-1340ND
2018-07-111610-008-1000ND
2018-07-181610-049-1005ND
2018-08-011610-078-1119ND
2018-09-041610-078-1025ND
2018-09-111610-901-1410ND
2018-09-111610-906-0850ND
2018-09-181610-902-0825ND
2018-09-181610-903-1045ND
2018-09-181610-905-0730ND
2018-09-181610-907-0820ND
2018-09-251610-900-0945ND
2018-09-251610-904-0840ND
2018-10-031610-078-1035ND
2018-10-101610-003-1120ND
2018-10-101610-008-09001.50 ppb
2018-10-101610-009-08401.20 ppb
2018-11-071610-078-1040ND
2018-12-051610-078-1000ND
2018-12-111610-901-09201.32 ppb
2018-12-111610-906-09501.05 ppb
2018-12-181610-902-0813ND
2018-12-181610-903-1255ND
2018-12-181610-905-0733ND
2018-12-181610-907-1020ND
2018-12-271610-900-0900ND
2018-12-271610-904-0851ND
2019-01-021610-078-1200ND
2019-01-081610-003-1220ND
2019-01-081610-008-11001.20 ppb
2019-01-081610-009-0950ND
2019-02-061610-078-1010ND
2019-03-061610-078-1015ND
2019-03-121610-901-0712ND
2019-03-121610-906-1230ND
2019-03-191610-902-0905ND
2019-03-191610-903-1010ND
2019-03-191610-905-0820ND
2019-03-191610-907-0725ND
2019-03-261610-900-1120ND
2019-03-261610-904-1050ND
2019-04-031610-078-1010ND
2019-04-101610-003-0820ND
2019-04-101610-008-1200ND
2019-04-101610-009-0840ND
2019-05-011610-078-1010ND
2019-06-051610-078-09304.40 ppb
2019-06-111610-901-09203.10 ppb
2019-06-111610-906-0855ND
2019-06-181610-902-0758ND
2019-06-181610-903-1010ND
2019-06-181610-905-0725ND
2019-06-181610-907-0810ND
2019-06-251610-900-0820ND
2019-06-251610-904-0845ND
2019-07-031610-078-1225ND
2019-07-031610-151-08352.40 ppb
2019-07-101610-003-11501.10 ppb
2019-07-101610-008-0930ND
2019-07-101610-009-09002.00 ppb
2019-07-171610-078-0730ND
2019-08-061610-166-1033ND
2019-08-141610-166-0854ND
2019-08-281610-078-0830ND
2019-09-041610-078-0910ND
2019-09-101610-032-102510.00 ppb
2019-09-101610-132-1045ND
2019-09-101610-901-0758ND
2019-09-101610-906-0920ND
2019-09-111610-134-1212ND
2019-09-111610-136-13108.60 ppb
2019-09-111610-166-1120ND
2019-09-171610-902-1200ND
2019-09-171610-903-1055ND
2019-09-171610-905-1245ND
2019-09-171610-907-0725ND
2019-09-181610-042-11252.80 ppb
2019-09-241610-900-0925ND
2019-09-241610-904-1105ND
2019-10-021610-078-0955ND
2019-10-091610-003-1050ND
2019-10-091610-008-1032ND
2019-10-091610-009-11051.20 ppb
2019-10-091610-166-0952ND
2019-11-061610-078-1200ND
2019-11-121610-166-0918ND
2019-12-041610-078-1015ND
2019-12-101610-901-10301.04 ppb
2019-12-101610-906-0803ND
2019-12-111610-166-1029ND
2019-12-171610-245-0900ND
2019-12-171610-902-1024ND
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