EWG's Tap Water Database — 2019 UPDATE



York Water Company

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





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20121.26 ppb2517ND - 2.44 ppb
20131.58 ppb2827ND - 2.33 ppb
20141.49 ppb16161.10 ppb - 2.10 ppb
20150.569 ppb167ND - 1.60 ppb
20161.16 ppb20200.590 ppb - 2.10 ppb
20171.01 ppb2019ND - 1.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2012-02-09CHAZS E. PRO1.54 ppb
2012-05-07CHAZS, E PRO1.81 ppb
2012-05-07STEWARTSTOWN2.33 ppb
2012-05-07YORKHANA TUR1.89 ppb
2012-05-07HOKE MILL1.91 ppb
2012-05-07W MANCESTER1.96 ppb
2012-05-07N YORK PUMPH2.00 ppb
2012-05-07MT ZION PUMP1.83 ppb
2012-05-07LOGANVILLE P1.76 ppb
2012-08-07CHAZS E. PRO1.42 ppb
2012-08-07STEWARTSTOWN2.44 ppb
2012-08-07YORKANA TURK1.71 ppb
2012-08-07HOKE MILL AB1.74 ppb
2012-08-07W. MANCHESTE1.70 ppb
2012-08-07N. YORK PUMP1.88 ppb
2012-08-07MT ZION PUMP1.91 ppb
2012-08-07LOGANVILLE P1.70 ppb
2012-11-07CHAZS E PROSND
2012-11-07HOKE MILL ABND
2012-11-07N YORK PUMPHND
2012-11-07MT ZION PUMPND
2013-02-07HOKE MILL AB1.05 ppb
2013-02-07W MANCHESTER1.17 ppb
2013-02-08CHAZS E PROSND
2013-02-08YORKANA TURK1.09 ppb
2013-02-08N YORK PUMPH1.17 ppb
2013-02-08MT ZION PUMP1.17 ppb
2013-02-08LOGANVILLE P1.35 ppb
2013-02-11STEWARTSTOWN1.22 ppb
2013-05-07CHAZS E PROS1.88 ppb
2013-05-07STEWARTSTOWN2.14 ppb
2013-05-07YORKANA TURK1.84 ppb
2013-05-08HOKE MILL1.98 ppb
2013-05-08W MANCHESTER1.67 ppb
2013-05-08N YORK PUMPH1.91 ppb
2013-05-08MT ZION PUMP2.04 ppb
2013-05-08LOGANVILLE P1.70 ppb
2013-08-07HOKE MILL1.84 ppb
2013-08-08W MANCHESTER2.12 ppb
2013-08-08N YORK PUMPH2.33 ppb
2013-08-08MT ZION PUMP2.21 ppb
2013-08-09CHAZS E PROS1.82 ppb
2013-08-09YORKANA TURK2.01 ppb
2013-08-12STEWARTSTOWN2.30 ppb
2013-08-12LOGANVILLE P1.64 ppb
2013-11-07STEWARTSTOWN1.14 ppb
2013-11-07W MANCHESTER1.16 ppb
2013-11-07LOGANVILLE P1.07 ppb
2013-11-11CHAZS E PROS1.15 ppb
2014-02-1114021711-0021.20 ppb
2014-02-1114021711-0041.30 ppb
2014-02-1214021711-0011.10 ppb
2014-02-1214021711-0031.40 ppb
2014-05-0714052045-0011.40 ppb
2014-05-0814052045-0021.50 ppb
2014-05-0814052045-0031.50 ppb
2014-05-0814052045-0041.60 ppb
2014-08-1114081341-0011.80 ppb
2014-08-1114081341-0022.10 ppb
2014-08-1114081341-0032.00 ppb
2014-08-1114081341-0041.90 ppb
2014-11-0714110761-0011.20 ppb
2014-11-0714110761-0021.30 ppb
2014-11-0714110761-0041.30 ppb
2014-11-0714110761-0031.30 ppb
2015-08-11132464401.20 ppb
2015-08-11132464461.60 ppb
2015-08-11132464521.60 ppb
2015-08-11132464581.60 ppb
2015-11-10136156330.960 ppb
2015-11-10136156390.940 ppb
2015-11-10136156451.20 ppb
2016-02-10139676890.730 ppb
2016-02-10139676950.590 ppb
2016-02-10139677010.720 ppb
2016-02-10139677070.650 ppb
2016-05-06143840311.20 ppb
2016-05-11143840420.820 ppb
2016-05-11143840481.000 ppb
2016-05-11143840361.000 ppb
2016-08-10148846451.30 ppb
2016-08-10148846551.20 ppb
2016-08-10148846601.30 ppb
2016-08-10148846501.20 ppb
2016-08-30150559502.10 ppb
2016-08-30150559582.00 ppb
2016-08-31150559642.10 ppb
2016-08-31150559701.40 ppb
2016-11-07153485770.970 ppb
2016-11-07153485950.980 ppb
2016-11-09153485830.990 ppb
2016-11-10153485890.900 ppb
2017-02-07157737471.000 ppb
2017-02-07157736961.000 ppb
2017-02-07157737351.10 ppb
2017-02-08157737410.970 ppb
2017-05-09162345841.20 ppb
2017-05-09162345731.000 ppb
2017-05-09162345780.940 ppb
2017-05-09162345891.20 ppb
2017-08-08167057311.000 ppb
2017-08-10167057430.860 ppb
2017-08-10167057371.60 ppb
2017-08-10167057491.50 ppb
2017-11-08171427431.10 ppb
2017-11-08171427851.10 ppb
2017-11-08171427671.10 ppb
2017-11-08171427610.930 ppb
2017-11-08171427730.880 ppb
2017-11-08171427790.670 ppb
2017-11-09171427551.10 ppb