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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

North Alamo Water Supply Company

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

 

229

Samples

0

Samples exceeding legal limit (MCL)

206

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201411.9 ppb3935ND - 36.2 ppb
201517.6 ppb38382.40 ppb - 59.4 ppb
20169.37 ppb3837ND - 32.0 ppb
20174.96 ppb3834ND - 14.6 ppb
20185.50 ppb3830ND - 27.5 ppb
20195.29 ppb3832ND - 14.4 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
2014-02-25AC44500ND
2014-02-25AC4450136.2 ppb
2014-02-25AC4448235.5 ppb
2014-02-25AC4448521.0 ppb
2014-02-25AC4448116.0 ppb
2014-02-25AC4448310.4 ppb
2014-02-25AC4448419.7 ppb
2014-02-25AC4447818.3 ppb
2014-05-06AC53215ND
2014-05-06AC5321410.8 ppb
2014-05-06AC532138.50 ppb
2014-05-06AC532126.10 ppb
2014-05-06AC5321611.1 ppb
2014-05-06AC532177.40 ppb
2014-06-17AC57101ND
2014-06-17AC5709519.0 ppb
2014-06-17AC5717118.8 ppb
2014-06-17AC5717212.8 ppb
2014-09-22AC676413.00 ppb
2014-09-22AC676350.600 ppb
2014-09-22AC676312.20 ppb
2014-09-22AC676254.20 ppb
2014-09-22AC676434.20 ppb
2014-09-22AC677042.70 ppb
2014-09-22AC6770121.5 ppb
2014-09-22AC6770228.6 ppb
2014-09-22AC677059.80 ppb
2014-09-22AC677316.40 ppb
2014-09-22AC677036.50 ppb
2014-09-22AC677004.90 ppb
2014-09-22AC677298.30 ppb
2014-11-21AC7270912.2 ppb
2014-11-21AC7278423.6 ppb
2014-11-21AC7270218.5 ppb
2014-11-21AC7278513.1 ppb
2014-11-21AC7270112.4 ppb
2014-11-21AC72707ND
2014-11-21AC7270817.1 ppb
2014-11-21AC7270313.2 ppb
2015-02-03AC7904824.0 ppb
2015-03-11AC8371118.1 ppb
2015-03-11AC8370959.4 ppb
2015-03-11AC8371235.1 ppb
2015-03-11AC8373524.8 ppb
2015-03-11AC8371016.8 ppb
2015-03-11AC8373722.9 ppb
2015-03-11AC8371336.5 ppb
2015-03-11AC8370717.7 ppb
2015-05-06AC9071210.7 ppb
2015-05-06AC9071718.4 ppb
2015-05-06AC9071522.7 ppb
2015-05-06AC9071919.1 ppb
2015-05-06AC9071814.0 ppb
2015-05-06AC907105.40 ppb
2015-05-06AC9072015.7 ppb
2015-05-06AC9071418.1 ppb
2015-07-15AC996795.20 ppb
2015-07-15AC996958.00 ppb
2015-07-15AC997112.40 ppb
2015-07-15AC997055.80 ppb
2015-07-15AC9968532.0 ppb
2015-07-15AC9961714.7 ppb
2015-07-15AC9961613.5 ppb
2015-07-15AC9961128.9 ppb
2015-07-15AC9961213.2 ppb
2015-07-15AC9961016.6 ppb
2015-07-15AC996189.30 ppb
2015-07-16AC9990523.9 ppb
2015-07-16AC999005.80 ppb
2015-10-22AD1148117.9 ppb
2015-10-22AD1147812.7 ppb
2015-10-22AD1148321.9 ppb
2015-10-22AD1148012.5 ppb
2015-10-22AD114736.50 ppb
2015-10-22AD1147713.3 ppb
2015-10-22AD1147417.0 ppb
2015-10-22AD114858.70 ppb
2016-01-27AD2035414.5 ppb
2016-01-27AD2035915.6 ppb
2016-01-27AD2033830.7 ppb
2016-01-27AD2036010.5 ppb
2016-01-27AD203575.50 ppb
2016-01-27AD203485.40 ppb
2016-01-27AD203618.00 ppb
2016-01-27AD2035810.7 ppb
2016-04-27AD343925.50 ppb
2016-04-27AD343905.70 ppb
2016-04-27AD343895.40 ppb
2016-04-27AD3437812.5 ppb
2016-04-27AD343824.90 ppb
2016-04-27AD343917.00 ppb
2016-04-27AD343877.80 ppb
2016-04-27AD343886.30 ppb
2016-08-03AD469031.30 ppb
2016-08-03AD469014.00 ppb
2016-08-03AD468871.40 ppb
2016-08-03AD468892.30 ppb
2016-08-03AD468856.50 ppb
2016-08-03AD46840ND
2016-08-03AD4682328.0 ppb
2016-08-03AD4683616.2 ppb
2016-08-03AD4684110.4 ppb
2016-08-03AD468202.40 ppb
2016-08-03AD468225.50 ppb
2016-08-03AD4684210.1 ppb
2016-08-03AD468216.30 ppb
2016-10-25AD5454221.2 ppb
2016-10-25AD5453832.0 ppb
2016-10-25AD545368.00 ppb
2016-10-25AD545357.60 ppb
2016-10-25AD545393.90 ppb
2016-10-25AD545376.00 ppb
2016-10-25AD545348.90 ppb
2016-10-25AD545418.10 ppb
2016-11-16AD5835310.00 ppb
2017-02-07AD691476.70 ppb
2017-02-07AD691457.70 ppb
2017-02-07AD691506.80 ppb
2017-02-07AD691486.40 ppb
2017-02-07AD69151ND
2017-02-07AD691494.10 ppb
2017-02-07AD691571.40 ppb
2017-02-07AD69146ND
2017-04-20AD803281.60 ppb
2017-04-20AD803259.60 ppb
2017-04-20AD803279.40 ppb
2017-04-20AD803296.80 ppb
2017-04-20AD803473.50 ppb
2017-04-20AD803332.80 ppb
2017-04-20AD803303.30 ppb
2017-04-20AD803264.10 ppb
2017-07-11AD889334.20 ppb
2017-07-11AD889251.80 ppb
2017-07-11AD889291.90 ppb
2017-07-11AD889313.40 ppb
2017-07-11AD889274.20 ppb
2017-07-11AD88848ND
2017-07-11AD888617.90 ppb
2017-07-11AD8886714.6 ppb
2017-07-11AD888687.40 ppb
2017-07-11AD888593.70 ppb
2017-07-11AD888609.30 ppb
2017-07-11AD888647.10 ppb
2017-07-11AD888545.50 ppb
2017-10-03AD990996.60 ppb
2017-10-03AD99011ND
2017-10-03AD990165.60 ppb
2017-10-03AD990141.90 ppb
2017-10-03AD990157.50 ppb
2017-10-03AD990173.60 ppb
2017-10-03AD990127.40 ppb
2017-10-03AD990186.10 ppb
2017-10-03AD990134.60 ppb
2018-01-23AE09830ND
2018-01-23AE098278.20 ppb
2018-01-23AE098151.10 ppb
2018-01-23AE098114.70 ppb
2018-01-23AE09812ND
2018-01-23AE098081.70 ppb
2018-01-23AE098143.20 ppb
2018-01-23AE098231.50 ppb
2018-04-10AE21835ND
2018-04-10AE21833ND
2018-04-10AE218392.00 ppb
2018-04-10AE218366.00 ppb
2018-04-10AE218321.70 ppb
2018-04-10AE218341.90 ppb
2018-04-10AE218381.000 ppb
2018-04-10AE218372.30 ppb
2018-07-11AE32983ND
2018-07-11AE32985ND
2018-07-11AE329872.40 ppb
2018-07-11AE329793.60 ppb
2018-07-11AE329814.90 ppb
2018-07-11AE32925ND
2018-07-11AE329237.50 ppb
2018-07-11AE3292411.9 ppb
2018-07-11AE329317.00 ppb
2018-07-11AE329334.70 ppb
2018-07-11AE329322.80 ppb
2018-07-11AE329342.20 ppb
2018-07-11AE329308.10 ppb
2018-11-06AE4543918.0 ppb
2018-11-06AE4537922.6 ppb
2018-11-06AE4537227.5 ppb
2018-11-06AE453768.30 ppb
2018-11-06AE453756.80 ppb
2018-11-06AE4537810.1 ppb
2018-11-06AE4537413.1 ppb
2018-11-06AE4537712.2 ppb
2018-11-06AE45373ND
2019-02-12AE540708.40 ppb
2019-02-12AE540407.50 ppb
2019-02-12AE540414.50 ppb
2019-02-12AE540444.20 ppb
2019-02-12AE540433.90 ppb
2019-02-12AE540344.20 ppb
2019-02-12AE540353.10 ppb
2019-02-12AE54045ND
2019-04-30AE6408414.2 ppb
2019-04-30AE6409311.2 ppb
2019-04-30AE640997.60 ppb
2019-04-30AE640944.20 ppb
2019-04-30AE640822.80 ppb
2019-04-30AE640924.80 ppb
2019-04-30AE640957.20 ppb
2019-04-30AE64083ND
2019-09-03AE81775ND
2019-09-03AE81773ND
2019-09-03AE817552.90 ppb
2019-09-03AE817592.90 ppb
2019-09-03AE817793.80 ppb
2019-09-03AE817059.70 ppb
2019-09-03AE8170610.7 ppb
2019-09-03AE817039.60 ppb
2019-09-03AE817043.90 ppb
2019-09-03AE817014.30 ppb
2019-09-03AE817074.20 ppb
2019-09-03AE817026.50 ppb
2019-09-03AE81700ND
2019-11-05AE884969.20 ppb
2019-11-05AE8845914.4 ppb
2019-11-05AE884605.00 ppb
2019-11-05AE8845710.4 ppb
2019-11-05AE884583.70 ppb
2019-11-05AE884532.10 ppb
2019-11-05AE884563.70 ppb
2019-11-05AE884556.20 ppb
2019-11-05AE88454ND