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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Dover 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

 

114

Samples

0

Samples exceeding legal limit (MCL)

74

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.790 ppb105ND - 2.80 ppb
20150.486 ppb72ND - 2.70 ppb
20162.91 ppb2319ND - 9.10 ppb
20173.23 ppb2617ND - 27.0 ppb
20181.91 ppb2518ND - 6.20 ppb
20191.61 ppb2316ND - 3.90 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
2014-02-18A4006940021.50 ppb
2014-05-08A4022080011.60 ppb
2014-07-10A4047060012.80 ppb
2014-07-14A404793001ND
2014-07-14A404793003ND
2014-07-23A405333001ND
2014-07-23A405333002ND
2014-07-23A405333004ND
2014-08-07A4062020011.10 ppb
2014-11-03A4088580010.900 ppb
2015-07-21A5054710010.700 ppb
2015-07-21A5054710022.70 ppb
2015-07-21A505471003ND
2015-07-21A505471004ND
2015-07-23A505633001ND
2015-07-23A505633002ND
2015-07-23A505633003ND
2016-02-10B6006430012.50 ppb
2016-02-10B6006430021.60 ppb
2016-02-10B6006430035.90 ppb
2016-02-10B6006430043.40 ppb
2016-05-17B6029060011.80 ppb
2016-05-17B6029060021.50 ppb
2016-05-17B6029060032.20 ppb
2016-05-17B6029060044.40 ppb
2016-07-06B6052230011.000 ppb
2016-07-06B605223003ND
2016-07-07B605299002ND
2016-07-07B605299003ND
2016-07-07B605299004ND
2016-07-13B6056890020.700 ppb
2016-07-25B6063840021.80 ppb
2016-08-16B6075670014.60 ppb
2016-08-16B6075670023.50 ppb
2016-08-16B6075670039.10 ppb
2016-08-16B6075670046.90 ppb
2016-11-14B6101940011.60 ppb
2016-11-14B6101940021.40 ppb
2016-11-14B6101940039.10 ppb
2016-11-14B6101940044.00 ppb
2017-02-15B7006920010.600 ppb
2017-02-15B7006920020.500 ppb
2017-02-15B7006920037.60 ppb
2017-02-15B7006920041.50 ppb
2017-05-12B702494001ND
2017-05-16B7025730010.600 ppb
2017-05-16B7025730020.500 ppb
2017-05-16B7025730036.90 ppb
2017-05-16B7025730044.40 ppb
2017-06-01B703156002ND
2017-07-19B705657001ND
2017-07-19B705657002ND
2017-07-19B705657004ND
2017-07-20B705749002ND
2017-07-20B705749004ND
2017-07-20B705749006ND
2017-08-14B7070450011.20 ppb
2017-08-14B7070450020.900 ppb
2017-08-14B7070450037.60 ppb
2017-08-14B7070450049.80 ppb
2017-10-10B7091240010.600 ppb
2017-10-10B709124002ND
2017-11-15B7098940014.70 ppb
2017-11-15B7098940023.30 ppb
2017-11-15B7098940036.40 ppb
2017-11-15B70989400427.0 ppb
2018-01-22B8002820010.600 ppb
2018-01-22B800282002ND
2018-02-12B8005580012.40 ppb
2018-02-12B8005580021.60 ppb
2018-02-12B8005580034.30 ppb
2018-02-12B8005580046.20 ppb
2018-03-27B801275001ND
2018-04-19B801796001ND
2018-05-15B8024490020.800 ppb
2018-05-17B8026010013.50 ppb
2018-05-17B8026010022.40 ppb
2018-05-17B8026010033.70 ppb
2018-05-18B8026430014.20 ppb
2018-07-24B805761001ND
2018-07-24B805761002ND
2018-08-15B806964001ND
2018-08-15B8069550012.40 ppb
2018-08-15B8069550022.20 ppb
2018-08-15B8069550030.600 ppb
2018-08-15B8069550045.60 ppb
2018-09-05B807804001ND
2018-11-15B8096310011.80 ppb
2018-11-15B8096310021.40 ppb
2018-11-15B8096310030.800 ppb
2018-11-15B8096310043.30 ppb
2019-02-11B9007560012.70 ppb
2019-02-11B9007560022.00 ppb
2019-02-11B9007560030.900 ppb
2019-02-11B9007560042.40 ppb
2019-04-11B901990001ND
2019-05-15B9028800012.20 ppb
2019-05-15B9028800021.80 ppb
2019-05-15B9028800032.90 ppb
2019-05-15B9028800042.40 ppb
2019-07-02B9049020010.500 ppb
2019-07-02B904902002ND
2019-07-10B905242002ND
2019-07-10B905242004ND
2019-07-10B905242005ND
2019-08-13B9072490011.70 ppb
2019-08-13B9072490021.70 ppb
2019-08-13B907249003ND
2019-08-13B9072490043.60 ppb
2019-11-14B910098001ND
2019-11-14B9100960013.90 ppb
2019-11-14B9100960023.50 ppb
2019-11-14B9100960031.000 ppb
2019-11-14B9100960043.90 ppb