Total trihalomethanes (TTHMs)
Oneonta City
Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Read More.
Studies conducted in the U.S. and Europe have found that drinking tap water that carries disinfection byproducts increases the risk of developing bladder cancer. In animal studies, all trihalomethanes cause liver, kidney and intestinal tumors. Some human epidemiological studies also reported an association between disinfection byproducts and an increased risk of problems during pregnancy, including spontaneous miscarriage, cardiovascular defects, neural tube defects and low birth weight.
The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 51.6 ppb | 12 | 12 | 31.9 ppb - 94.8 ppb |
2015 | 58.3 ppb | 11 | 11 | 25.0 ppb - 108.3 ppb |
2016 | 59.8 ppb | 16 | 16 | 19.0 ppb - 110.0 ppb |
2017 | 52.2 ppb | 16 | 16 | 18.6 ppb - 109.0 ppb |
2018 | 46.7 ppb | 16 | 16 | 23.6 ppb - 82.6 ppb |
2019 | 52.2 ppb | 16 | 16 | 17.1 ppb - 98.6 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.15 ppb
The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.
EPA Maximum Contaminant
Level (MCL) 80 ppb
The legal limit for the group of four trihalomethanes, established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer due to exposure to trihalomethanes.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2014-02-12 | 140216902A | 31.9 ppb |
2014-02-12 | 14021690 | 37.3 ppb |
2014-02-12 | 140216903A | 63.3 ppb |
2014-02-12 | 140216904A | 94.8 ppb |
2014-05-14 | 14053036004A | 55.4 ppb |
2014-05-14 | 14053036A | 49.7 ppb |
2014-05-14 | 14053036006A | 44.1 ppb |
2014-05-14 | 14053036005A | 60.3 ppb |
2014-11-19 | S4K1798-02 | 33.1 ppb |
2014-11-19 | S4K1787-01 | 41.4 ppb |
2014-11-19 | S4K1787-03 | 42.5 ppb |
2014-11-19 | S4K1787-04 | 65.9 ppb |
2015-02-18 | 1502C77-001 | 25.0 ppb |
2015-02-18 | 1502C77-002 | 43.0 ppb |
2015-02-18 | 1502C77-004 | 47.0 ppb |
2015-02-18 | 1502C77-003 | 66.0 ppb |
2015-05-13 | AS09450 | 44.8 ppb |
2015-05-13 | AS09449 | 62.8 ppb |
2015-05-13 | AS09448 | 41.9 ppb |
2015-05-13 | AS09451 | 54.1 ppb |
2015-08-19 | H32EEL | 82.0 ppb |
2015-08-19 | H32WWTP | 66.0 ppb |
2015-08-19 | H32HC | 108.3 ppb |
2016-02-10 | 1292-004 | 36.0 ppb |
2016-02-10 | 1292-003 | 37.0 ppb |
2016-02-10 | 1292-006 | 19.0 ppb |
2016-02-10 | 1292-005 | 28.0 ppb |
2016-05-11 | 1604910-005 | 47.0 ppb |
2016-05-11 | 1604910-004 | 68.0 ppb |
2016-05-11 | 1604910-007 | 52.0 ppb |
2016-05-11 | 1604910-006 | 40.0 ppb |
2016-08-17 | 1608789-003 | 110.0 ppb |
2016-08-17 | 1608789-004 | 110.0 ppb |
2016-08-17 | 1608789-006 | 91.0 ppb |
2016-08-17 | 1608789-005 | 72.0 ppb |
2016-11-09 | EEL DBP 4Q16 | 56.0 ppb |
2016-11-09 | WWTP DBP 4Q16 | 42.0 ppb |
2016-11-09 | HC DBP 4Q16 | 67.0 ppb |
2016-11-09 | BB THM 4Q16 | 82.0 ppb |
2017-02-08 | WWP DBP 2-17 | 24.0 ppb |
2017-02-08 | HC DBP 2-17 | 42.1 ppb |
2017-02-08 | EEL HAA 2-17 | 33.5 ppb |
2017-02-08 | BB DBP 2-17 | 18.6 ppb |
2017-05-10 | COWWPDBP52017 | 32.4 ppb |
2017-05-10 | COEELDBP52017 | 51.3 ppb |
2017-05-10 | COBSDBP52017 | 25.9 ppb |
2017-05-10 | COHCDBP52017 | 49.6 ppb |
2017-08-16 | 225535-EELAU | 68.4 ppb |
2017-08-16 | 225535-WWTP | 60.1 ppb |
2017-08-16 | 225535-HART | 109.0 ppb |
2017-08-16 | 225535-BUG | 96.2 ppb |
2017-11-08 | WWTP 4Q 17 | 48.3 ppb |
2017-11-08 | HART COLLEG 4Q 1 | 62.8 ppb |
2017-11-08 | BUGBEE 4Q 17 DBP | 63.1 ppb |
2017-11-08 | EEL ONEONTA 1181 | 50.5 ppb |
2018-02-14 | 7043140006 | 28.5 ppb |
2018-02-14 | 7043140005 | 23.6 ppb |
2018-03-05 | 7044500002 | 29.1 ppb |
2018-03-05 | 7044500001 | 35.3 ppb |
2018-05-08 | 397003 | 48.1 ppb |
2018-05-08 | 397004 | 39.5 ppb |
2018-05-08 | 397006 | 40.0 ppb |
2018-05-08 | 397005 | 33.1 ppb |
2018-08-08 | 95003 | 53.5 ppb |
2018-08-08 | 95006 | 51.8 ppb |
2018-08-08 | 95004 | 82.6 ppb |
2018-08-08 | 95005 | 57.5 ppb |
2018-11-14 | EEL DBP 112018 | 38.0 ppb |
2018-11-14 | HART DBP 112018 | 73.2 ppb |
2018-11-14 | BUG DBP 112018 | 60.7 ppb |
2018-11-14 | WWTP DBP 112018 | 52.9 ppb |
2019-02-12 | 7079734004DBP | 21.0 ppb |
2019-02-12 | 7079734006DBP | 17.1 ppb |
2019-02-12 | 7079734005 | 32.8 ppb |
2019-02-12 | 7079734007DBP | 23.2 ppb |
2019-05-07 | 7088995003 | 56.1 ppb |
2019-05-07 | 7088995004 | 39.4 ppb |
2019-05-07 | 70088995006 | 60.2 ppb |
2019-05-07 | 7088995005 | 46.5 ppb |
2019-08-20 | ONE EEL DBP 3Q19 | 62.5 ppb |
2019-08-20 | ONE BUG DBP 3Q19 | 92.2 ppb |
2019-08-20 | ONE HART DBP 3Q1 | 98.6 ppb |
2019-08-20 | ONE WWTP DBP 3Q1 | 75.3 ppb |
2019-10-13 | DBP EEL 4Q19 | 33.0 ppb |
2019-10-13 | WWTP DBP 4Q19 | 44.0 ppb |
2019-10-13 | BUGBEE DBP 4Q19 | 50.3 ppb |
2019-10-13 | HART DBP 4Q19 | 82.4 ppb |