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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

California Water Service - South San Francisco

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

386

Samples

0

Samples exceeding legal limit (MCL)

239

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.838 ppb12356ND - 5.90 ppb
20150.891 ppb9847ND - 3.87 ppb
20161.70 ppb6142ND - 6.45 ppb
20173.45 ppb4030ND - 18.0 ppb
20181.30 ppb32320.770 ppb - 4.85 ppb
20191.98 ppb32320.640 ppb - 4.46 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-01-095701-013-0940ND
2014-01-145701-009-11320.910 ppb
2014-01-145701-010-11382.75 ppb
2014-01-145701-011-1130ND
2014-01-285701-013-0922ND
2014-02-045701-013-1006ND
2014-02-055701-009-10310.920 ppb
2014-02-055701-010-10132.80 ppb
2014-02-055701-011-1030ND
2014-02-115701-013-1327ND
2014-02-195701-013-1335ND
2014-02-255701-003-1325ND
2014-02-255701-013-1048ND
2014-03-045701-013-1004ND
2014-03-055701-009-14030.690 ppb
2014-03-055701-010-14101.32 ppb
2014-03-055701-011-1400ND
2014-03-105701-010-13501.50 ppb
2014-03-105701-900-08051.79 ppb
2014-03-105701-901-08451.80 ppb
2014-03-105701-902-10351.53 ppb
2014-03-105701-903-08252.04 ppb
2014-03-105701-904-09052.55 ppb
2014-03-105701-906-10151.02 ppb
2014-03-105701-907-13050.970 ppb
2014-03-115701-013-1340ND
2014-03-165701-013-0937ND
2014-03-185701-006-1048ND
2014-03-185701-007-1100ND
2014-03-185701-008-1037ND
2014-03-185701-014-1021ND
2014-03-275701-013-1038ND
2014-04-035701-013-1130ND
2014-04-085701-013-1100ND
2014-04-155701-009-13290.920 ppb
2014-04-155701-010-13341.71 ppb
2014-04-155701-011-1325ND
2014-04-155701-013-1117ND
2014-04-295701-013-0910ND
2014-05-055701-013-1134ND
2014-05-145701-013-0842ND
2014-05-205701-009-11211.10 ppb
2014-05-205701-010-11381.40 ppb
2014-05-205701-011-1119ND
2014-05-205701-013-1100ND
2014-05-275701-013-1050ND
2014-06-045701-009-08300.920 ppb
2014-06-045701-010-08401.73 ppb
2014-06-045701-011-0828ND
2014-06-045701-013-1130ND
2014-06-095701-010-13401.49 ppb
2014-06-095701-013-1117ND
2014-06-095701-900-08151.88 ppb
2014-06-095701-901-11301.63 ppb
2014-06-095701-902-13501.49 ppb
2014-06-095701-903-11152.39 ppb
2014-06-095701-904-11452.39 ppb
2014-06-095701-906-14155.90 ppb
2014-06-095701-907-11000.940 ppb
2014-06-175701-013-1125ND
2014-07-095701-013-1011ND
2014-07-155701-013-1136ND
2014-07-165701-009-11270.690 ppb
2014-07-165701-010-11382.00 ppb
2014-07-165701-011-1124ND
2014-07-225701-013-1140ND
2014-07-295701-013-1137ND
2014-08-055701-013-1530ND
2014-08-135810-009-08401.10 ppb
2014-08-135810-010-08503.20 ppb
2014-08-135810-011-0837ND
2014-08-135810-013-0815ND
2014-08-185701-013-1103ND
2014-08-265701-013-1126ND
2014-09-035701-013-1027ND
2014-09-085701-013-1025ND
2014-09-115701-010-08571.85 ppb
2014-09-115701-900-11071.58 ppb
2014-09-115701-901-10512.08 ppb
2014-09-115701-902-11222.00 ppb
2014-09-115701-903-09082.35 ppb
2014-09-115701-904-09432.61 ppb
2014-09-115701-906-10364.53 ppb
2014-09-115701-907-09241.46 ppb
2014-09-165701-009-09120.920 ppb
2014-09-165701-010-09402.87 ppb
2014-09-165701-011-0910ND
2014-09-165701-013-0855ND
2014-09-235701-013-1330ND
2014-09-255701-006-1321ND
2014-09-255701-007-1328ND
2014-09-255701-008-1313ND
2014-09-255701-014-1355ND
2014-10-025701-009-11130.910 ppb
2014-10-025701-010-11181.63 ppb
2014-10-025701-011-1112ND
2014-11-045701-013-1111ND
2014-11-125701-009-13200.570 ppb
2014-11-125701-010-13372.11 ppb
2014-11-125701-011-1318ND
2014-11-125701-013-1107ND
2014-11-185701-013-1122ND
2014-11-195701-003-1111ND
2014-11-245701-013-1320ND
2014-12-025701-013-0911ND
2014-12-045701-009-13430.720 ppb
2014-12-045701-010-13561.83 ppb
2014-12-045701-011-1342ND
2014-12-085701-010-07172.32 ppb
2014-12-085701-900-07172.68 ppb
2014-12-085701-901-07171.90 ppb
2014-12-085701-902-07171.65 ppb
2014-12-085701-903-07172.81 ppb
2014-12-085701-904-07173.49 ppb
2014-12-085701-906-07171.42 ppb
2014-12-085701-907-07171.27 ppb
2014-12-095701-013-1022ND
2014-12-165701-013-1416ND
2014-12-175701-006-1025ND
2014-12-175701-007-1032ND
2014-12-175701-008-1004ND
2014-12-219590-013-1430ND
2014-12-309590-013-1035ND
2015-01-055701-013-1330ND
2015-01-075701-009-11350.700 ppb
2015-01-075701-010-11463.06 ppb
2015-01-075701-011-1132ND
2015-01-135701-013-1101ND
2015-01-205701-013-1100ND
2015-01-265701-013-1029ND
2015-02-025701-013-1034ND
2015-02-115701-009-09020.680 ppb
2015-02-115701-010-09113.87 ppb
2015-02-115701-011-0900ND
2015-02-115701-013-0920ND
2015-02-115701-014-1033ND
2015-02-175701-013-0952ND
2015-02-185701-003-1040ND
2015-02-235701-013-1101ND
2015-03-035701-013-1342ND
2015-03-045701-009-09380.650 ppb
2015-03-045701-010-09482.52 ppb
2015-03-045701-011-0939ND
2015-03-105701-010-09371.61 ppb
2015-03-105701-013-1355ND
2015-03-105701-900-09392.68 ppb
2015-03-105701-901-09391.92 ppb
2015-03-105701-902-09391.68 ppb
2015-03-105701-903-09372.54 ppb
2015-03-105701-904-09373.69 ppb
2015-03-105701-906-09393.28 ppb
2015-03-105701-907-09371.31 ppb
2015-03-165701-013-1121ND
2015-03-195701-006-1041ND
2015-03-195701-007-1053ND
2015-03-195701-008-1021ND
2015-03-245701-013-1117ND
2015-03-315701-013-1310ND
2015-04-075701-009-14050.650 ppb
2015-04-075701-010-14301.64 ppb
2015-04-075701-011-1400ND
2015-04-075701-013-1340ND
2015-04-145701-013-1435ND
2015-04-225701-013-1334ND
2015-04-285701-013-0950ND
2015-05-069590-009-1425ND
2015-05-069590-010-15021.50 ppb
2015-05-069590-011-1421ND
2015-05-069590-013-1400ND
2015-05-139590-013-1321ND
2015-05-195701-013-1039ND
2015-05-215701-003-1336ND
2015-05-265701-013-1136ND
2015-05-275701-014-1332ND
2015-06-015701-013-1130ND
2015-06-025701-009-10060.650 ppb
2015-06-025701-010-10171.65 ppb
2015-06-025701-011-1005ND
2015-06-095701-013-1000ND
2015-06-155701-010-07591.74 ppb
2015-06-155701-013-1352ND
2015-06-155701-900-07591.61 ppb
2015-06-155701-901-07591.90 ppb
2015-06-155701-902-07591.72 ppb
2015-06-155701-903-07592.38 ppb
2015-06-155701-904-07592.68 ppb
2015-06-155701-906-07593.51 ppb
2015-06-165701-907-08551.37 ppb
2015-06-185701-006-1142ND
2015-06-185701-007-1428ND
2015-06-185701-008-1455ND
2015-06-235701-013-1005ND
2015-06-305701-013-0915ND
2015-07-065701-013-0909ND
2015-07-075701-009-11260.620 ppb
2015-07-075701-010-13172.13 ppb
2015-07-075701-011-1124ND
2015-08-265701-003-1410ND
2015-08-265701-006-1420ND
2015-09-165701-010-08321.57 ppb
2015-09-165701-900-08321.91 ppb
2015-09-165701-901-08321.52 ppb
2015-09-165701-902-08321.46 ppb
2015-09-165701-903-08321.81 ppb
2015-09-165701-904-08322.38 ppb
2015-09-165701-906-08323.59 ppb
2015-09-165701-907-08321.61 ppb
2015-11-165701-003-1320ND
2015-11-165701-006-1327ND
2015-11-165701-009-13360.590 ppb
2015-11-165701-010-11411.78 ppb
2015-11-165701-011-1339ND
2015-11-185810-014-1111ND
2015-12-155701-900-08031.58 ppb
2015-12-155701-901-08031.38 ppb
2015-12-155701-902-08031.37 ppb
2015-12-155701-906-08031.40 ppb
2015-12-165810-010-12591.50 ppb
2015-12-165810-903-10321.50 ppb
2015-12-165810-904-11462.80 ppb
2015-12-165810-907-11031.60 ppb
2016-02-165701-013-0957ND
2016-02-175701-003-1001ND
2016-02-175701-006-1008ND
2016-02-175701-009-09340.660 ppb
2016-02-175701-010-09472.75 ppb
2016-02-175701-011-0931ND
2016-03-025701-009-11330.760 ppb
2016-03-025701-010-11503.20 ppb
2016-03-025701-011-1134ND
2016-03-155701-010-08243.03 ppb
2016-03-155701-900-08243.80 ppb
2016-03-155701-901-08243.70 ppb
2016-03-155701-902-08242.87 ppb
2016-03-155701-903-08243.55 ppb
2016-03-155701-904-08243.94 ppb
2016-03-155701-906-08243.31 ppb
2016-03-155701-907-08243.29 ppb
2016-03-169590-014-1407ND
2016-04-115701-009-09130.770 ppb
2016-04-115701-010-09263.59 ppb
2016-04-115701-011-0905ND
2016-05-115701-009-08460.720 ppb
2016-05-115701-010-09382.67 ppb
2016-05-115701-011-0844ND
2016-05-175701-003-1037ND
2016-05-175701-006-1044ND
2016-05-175701-013-1053ND
2016-06-075701-009-09550.690 ppb
2016-06-075701-010-10111.72 ppb
2016-06-075701-011-0955ND
2016-06-135701-010-14230.860 ppb
2016-06-135701-900-14230.930 ppb
2016-06-135701-901-14231.10 ppb
2016-06-135701-902-14230.830 ppb
2016-06-135701-903-14231.49 ppb
2016-06-135701-904-14231.93 ppb
2016-06-135701-906-14235.14 ppb
2016-06-135701-907-14231.000 ppb
2016-09-145701-010-08271.46 ppb
2016-09-145701-900-08271.41 ppb
2016-09-145701-901-08271.14 ppb
2016-09-145701-902-08271.54 ppb
2016-09-145701-903-08271.39 ppb
2016-09-145701-904-08271.11 ppb
2016-09-145701-906-08276.45 ppb
2016-09-145701-907-08271.43 ppb
2016-09-265701-013-1024ND
2016-09-275701-003-0950ND
2016-09-275701-006-1000ND
2016-11-285701-003-1156ND
2016-11-285701-006-1134ND
2016-11-295701-013-1010ND
2016-12-065701-014-1008ND
2016-12-125810-010-14482.80 ppb
2016-12-125810-900-14034.40 ppb
2016-12-125810-901-13123.80 ppb
2016-12-125810-902-13462.80 ppb
2016-12-125810-903-14253.70 ppb
2016-12-125810-904-14373.40 ppb
2016-12-125810-906-13315.00 ppb
2016-12-125810-907-14163.60 ppb
2017-03-065810-010-134217.0 ppb
2017-03-135810-010-135018.0 ppb
2017-03-155810-900-10334.80 ppb
2017-03-155810-901-10214.60 ppb
2017-03-155810-902-10475.20 ppb
2017-03-155810-906-11005.90 ppb
2017-03-165701-903-09204.18 ppb
2017-03-165701-904-09204.04 ppb
2017-03-165701-907-09203.97 ppb
2017-03-275810-010-09412.80 ppb
2017-06-025701-902-13213.60 ppb
2017-06-025701-904-13144.10 ppb
2017-06-125810-010-10554.40 ppb
2017-06-125701-900-08005.41 ppb
2017-06-125701-901-08004.68 ppb
2017-06-125701-902-08004.46 ppb
2017-06-125810-903-10054.40 ppb
2017-06-125810-904-11254.60 ppb
2017-06-125701-906-08006.02 ppb
2017-06-125810-907-09455.20 ppb
2017-09-125810-010-08101.000 ppb
2017-09-125810-900-0910ND
2017-09-125810-901-0940ND
2017-09-125810-902-0820ND
2017-09-125810-903-0930ND
2017-09-125810-904-0950ND
2017-09-125810-906-10051.10 ppb
2017-09-125810-907-0840ND
2017-11-289590-006-1130ND
2017-11-289590-008-1500ND
2017-11-289590-013-1230ND
2017-11-289590-014-1056ND
2017-12-145810-010-10392.10 ppb
2017-12-145701-900-08251.75 ppb
2017-12-145701-901-08251.71 ppb
2017-12-145701-902-08251.79 ppb
2017-12-145810-903-11222.10 ppb
2017-12-145810-904-11101.80 ppb
2017-12-145701-906-08255.24 ppb
2017-12-145810-907-11472.00 ppb
2018-03-145701-010-08360.810 ppb
2018-03-145701-900-08360.790 ppb
2018-03-145701-901-08360.770 ppb
2018-03-145701-902-08360.790 ppb
2018-03-145701-903-08360.820 ppb
2018-03-145701-904-08360.940 ppb
2018-03-145701-906-08364.28 ppb
2018-03-145701-907-08360.850 ppb
2018-06-115701-010-08530.840 ppb
2018-06-115701-900-08530.840 ppb
2018-06-115701-901-08530.840 ppb
2018-06-115701-902-08530.890 ppb
2018-06-115701-903-08530.890 ppb
2018-06-115701-904-08530.870 ppb
2018-06-115701-906-08534.46 ppb
2018-06-115701-907-08530.920 ppb
2018-09-115701-010-08180.950 ppb
2018-09-115701-900-08180.950 ppb
2018-09-115701-901-08180.940 ppb
2018-09-115701-902-08181.000 ppb
2018-09-115701-903-08180.970 ppb
2018-09-115701-904-08180.940 ppb
2018-09-115701-906-08184.85 ppb
2018-09-115701-907-08180.960 ppb
2018-12-125701-010-09190.850 ppb
2018-12-125701-900-09191.02 ppb
2018-12-125701-901-09190.840 ppb
2018-12-125701-902-09190.860 ppb
2018-12-125701-903-09190.920 ppb
2018-12-125701-904-09190.850 ppb
2018-12-125701-906-09193.04 ppb
2018-12-125701-907-09190.910 ppb
2019-03-125701-010-09003.27 ppb
2019-03-125701-900-09003.47 ppb
2019-03-125701-901-09003.35 ppb
2019-03-125701-902-09003.48 ppb
2019-03-125701-903-09003.49 ppb
2019-03-125701-904-09003.32 ppb
2019-03-125701-906-09003.52 ppb
2019-03-125701-907-09003.85 ppb
2019-06-125701-010-09221.29 ppb
2019-06-125701-900-09221.32 ppb
2019-06-125701-901-09221.25 ppb
2019-06-125701-902-09221.31 ppb
2019-06-125701-903-09221.25 ppb
2019-06-125701-904-09221.24 ppb
2019-06-125701-906-09221.29 ppb
2019-06-125701-907-09221.32 ppb
2019-09-105701-010-09100.750 ppb
2019-09-105701-900-08001.34 ppb
2019-09-105701-901-08400.650 ppb
2019-09-105701-902-09200.720 ppb
2019-09-105701-903-08300.730 ppb
2019-09-105701-904-08500.640 ppb
2019-09-105701-906-10404.46 ppb
2019-09-105701-907-08151.44 ppb
2019-12-125701-010-09171.64 ppb
2019-12-125701-900-07311.65 ppb
2019-12-125701-901-08401.46 ppb
2019-12-125701-902-08561.66 ppb
2019-12-125701-903-08281.56 ppb
2019-12-125701-904-08161.48 ppb
2019-12-125701-906-09353.57 ppb
2019-12-125701-907-08001.71 ppb