Chloroform
Middletown Water Department
Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.
In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 39.4 ppb | 18 | 18 | 5.40 ppb - 73.6 ppb |
| 2019 | 40.2 ppb | 18 | 18 | 5.80 ppb - 71.1 ppb |
| 2020 | 33.8 ppb | 18 | 18 | 4.80 ppb - 75.1 ppb |
| 2021 | 36.3 ppb | 19 | 19 | 2.30 ppb - 90.5 ppb |
| 2022 | 31.8 ppb | 18 | 18 | 4.00 ppb - 61.6 ppb |
| 2023 | 38.9 ppb | 18 | 18 | 8.10 ppb - 90.6 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.4 ppb
The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-05 | DBP 200485410 | 20.0 ppb |
| 2018-01-05 | DBP 200485411 | 23.9 ppb |
| 2018-01-05 | DBP 200485412 | 49.3 ppb |
| 2018-01-05 | DBP 200485413 | 26.7 ppb |
| 2018-03-28 | VOC1 200490770 | 15.8 ppb |
| 2018-04-05 | DBP 200491446 | 29.7 ppb |
| 2018-04-05 | DBP 200491447 | 27.6 ppb |
| 2018-04-05 | DBP 200491448 | 30.6 ppb |
| 2018-04-05 | DBP 200491449 | 28.5 ppb |
| 2018-04-16 | VOC1 200492154 | 5.40 ppb |
| 2018-07-04 | DBP 200498638 | 56.5 ppb |
| 2018-07-04 | DBP 200498639 | 50.0 ppb |
| 2018-07-04 | DBP 200498640 | 60.5 ppb |
| 2018-07-04 | DBP 200498641 | 73.6 ppb |
| 2018-10-04 | DBP 200508047 | 49.2 ppb |
| 2018-10-04 | DBP 200508048 | 48.1 ppb |
| 2018-10-04 | DBP 200508049 | 57.5 ppb |
| 2018-10-04 | DBP 200508050 | 56.2 ppb |
| 2019-01-03 | DBP 200517506 | 25.1 ppb |
| 2019-01-03 | DBP 200517507 | 27.6 ppb |
| 2019-01-03 | DBP 200517508 | 54.2 ppb |
| 2019-01-03 | DBP 200517509 | 30.3 ppb |
| 2019-04-04 | DBP 200527182 | 35.9 ppb |
| 2019-04-04 | DBP 200527183 | 33.5 ppb |
| 2019-04-04 | DBP 200527184 | 41.9 ppb |
| 2019-04-04 | DBP 200527185 | 42.7 ppb |
| 2019-05-13 | VOC1 200531893 | 5.80 ppb |
| 2019-05-21 | VOC1 200533083 | 30.0 ppb |
| 2019-07-03 | DBP 200538922 | 71.1 ppb |
| 2019-07-03 | DBP 200538923 | 50.6 ppb |
| 2019-07-03 | DBP 200538924 | 67.1 ppb |
| 2019-07-03 | DBP 200538925 | 69.4 ppb |
| 2019-10-17 | DBP 200553333 | 26.8 ppb |
| 2019-10-17 | DBP 200553335 | 35.8 ppb |
| 2019-10-17 | DBP 200553337 | 36.8 ppb |
| 2019-10-17 | DBP 200553339 | 38.3 ppb |
| 2020-01-09 | DBP 200562313 | 17.0 ppb |
| 2020-01-09 | DBP 200562314 | 18.9 ppb |
| 2020-01-09 | DBP 200562315 | 24.2 ppb |
| 2020-01-09 | DBP 200562316 | 20.6 ppb |
| 2020-04-09 | DBP 200571893 | 36.2 ppb |
| 2020-04-09 | DBP 200571895 | 36.3 ppb |
| 2020-04-09 | DBP 200571896 | 32.3 ppb |
| 2020-04-09 | DBP 200571897 | 35.4 ppb |
| 2020-05-06 | VOC1 200574723 | 17.1 ppb |
| 2020-05-14 | VOC1 200575833 | 4.80 ppb |
| 2020-07-09 | DBP 200582084 | 56.9 ppb |
| 2020-07-09 | DBP 200582085 | 49.7 ppb |
| 2020-07-09 | DBP 200582086 | 55.6 ppb |
| 2020-07-09 | DBP 200582087 | 75.1 ppb |
| 2020-10-15 | DBP 200594167 | 30.4 ppb |
| 2020-10-15 | DBP 200594168 | 25.4 ppb |
| 2020-10-15 | DBP 200594169 | 34.1 ppb |
| 2020-10-15 | DBP 200594170 | 38.6 ppb |
| 2021-01-14 | DBP 200603899 | 24.4 ppb |
| 2021-01-14 | DBP 200603900 | 21.3 ppb |
| 2021-01-14 | DBP 200603901 | 15.7 ppb |
| 2021-01-14 | DBP 200603902 | 23.4 ppb |
| 2021-03-03 | VOC1 200612185 | 5.00 ppb |
| 2021-03-30 | VOC1 200612183 | 17.7 ppb |
| 2021-03-30 | VOC1 200612184 | 2.30 ppb |
| 2021-04-15 | DBP 200613337 | 34.4 ppb |
| 2021-04-15 | DBP 200613338 | 23.7 ppb |
| 2021-04-15 | DBP 200613339 | 22.7 ppb |
| 2021-04-15 | DBP 200613340 | 33.0 ppb |
| 2021-07-08 | DBP 200623691 | 52.4 ppb |
| 2021-07-08 | DBP 200623693 | 51.9 ppb |
| 2021-07-08 | DBP 200623708 | 52.0 ppb |
| 2021-07-08 | DBP 200623709 | 71.6 ppb |
| 2021-10-21 | B300086243 300086245 | 37.4 ppb |
| 2021-10-21 | B300086246 300086248 | 62.3 ppb |
| 2021-10-21 | B300086249 300086251 | 90.5 ppb |
| 2021-10-21 | B300086252 300086254 | 47.4 ppb |
| 2022-01-06 | D300128620 300128622 | 30.2 ppb |
| 2022-01-06 | D300128623 300128625 | 26.5 ppb |
| 2022-01-06 | D300128626 300128628 | 32.3 ppb |
| 2022-01-06 | D300128629 300128631 | 27.1 ppb |
| 2022-04-07 | D300167654 300167656 | 26.7 ppb |
| 2022-04-07 | D300167657 300167659 | 22.2 ppb |
| 2022-04-07 | D300167660 300167662 | 26.2 ppb |
| 2022-04-07 | D300167663 300167665 | 20.8 ppb |
| 2022-05-11 | V300182524 300182531 | 17.6 ppb |
| 2022-05-11 | V300182526 300182544 | 4.00 ppb |
| 2022-07-07 | D300209431 300209433 | 49.7 ppb |
| 2022-07-07 | D300209434 300209436 | 46.3 ppb |
| 2022-07-07 | D300209437 300209439 | 61.6 ppb |
| 2022-07-07 | D300209440 300209442 | 52.3 ppb |
| 2022-10-27 | D300264516 300264518 | 36.3 ppb |
| 2022-10-27 | D300264519 300264521 | 26.9 ppb |
| 2022-10-27 | D300264522 300264524 | 42.5 ppb |
| 2022-10-27 | D300264525 300264527 | 23.6 ppb |
| 2023-01-12 | D300297210 300297212 | 24.6 ppb |
| 2023-01-12 | D300297213 300297215 | 20.0 ppb |
| 2023-01-12 | D300297216 300297218 | 27.5 ppb |
| 2023-01-12 | D300297219 300297221 | 27.7 ppb |
| 2023-04-20 | D300336739 300336741 | 36.1 ppb |
| 2023-04-20 | D300336742 300336744 | 31.8 ppb |
| 2023-04-20 | D300336745 300336747 | 39.2 ppb |
| 2023-04-20 | D300336748 300336750 | 47.5 ppb |
| 2023-06-23 | V300370771 300370772 | 27.3 ppb |
| 2023-06-23 | V300370773 300370774 | 8.10 ppb |
| 2023-07-06 | D300377098 300377100 | 64.8 ppb |
| 2023-07-06 | D300377101 300377103 | 69.6 ppb |
| 2023-07-06 | D300377104 300377106 | 90.6 ppb |
| 2023-07-06 | D300377107 300377109 | 60.8 ppb |
| 2023-10-19 | D300433229 300433231 | 29.7 ppb |
| 2023-10-19 | D300433232 300433234 | 26.8 ppb |
| 2023-10-19 | D300433235 300433237 | 43.2 ppb |
| 2023-10-19 | D300433238 300433240 | 24.5 ppb |