Chloroform
Manchester 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 | 9.70 ppb | 49 | 35 | ND - 38.0 ppb |
| 2019 | 10.9 ppb | 48 | 34 | ND - 56.0 ppb |
| 2020 | 12.7 ppb | 48 | 34 | ND - 45.9 ppb |
| 2021 | 14.3 ppb | 48 | 36 | ND - 65.9 ppb |
| 2022 | 13.4 ppb | 48 | 34 | ND - 47.2 ppb |
| 2023 | 12.4 ppb | 49 | 34 | ND - 45.3 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 |
|---|---|---|
| 2018-01-08 | AA82357-DBP1 | 27.0 ppb |
| 2018-01-08 | AA82358-DBP1 | 16.0 ppb |
| 2018-01-08 | AA82359-DBP1 | 5.80 ppb |
| 2018-01-08 | AA82323-VOC1 | 2.30 ppb |
| 2018-01-08 | AA82328-VOC1 | ND |
| 2018-01-08 | AA82329-VOC1 | ND |
| 2018-01-09 | AA82360-DBP1 | 13.0 ppb |
| 2018-01-09 | AA82343-DBP1 | 6.20 ppb |
| 2018-01-09 | AA82355-DBP1 | 11.0 ppb |
| 2018-01-09 | AA82356-DBP1 | 14.0 ppb |
| 2018-01-09 | AA82347-VOC1 | 0.600 ppb |
| 2018-01-09 | AA82348-VOC1 | ND |
| 2018-01-09 | AA82350-VOC1 | ND |
| 2018-01-10 | AA82378-DBP1 | 23.0 ppb |
| 2018-01-10 | AA82372-VOC1 | ND |
| 2018-01-10 | AA82373-VOC1 | ND |
| 2018-04-10 | AA83453-VOC1 | ND |
| 2018-04-10 | AA83456-VOC1 | ND |
| 2018-04-11 | AA83470-VOC1 | 0.500 ppb |
| 2018-04-16 | AA83526-DBP1 | 20.0 ppb |
| 2018-04-16 | AA83527-DBP1 | 2.20 ppb |
| 2018-04-17 | AA83543-DBP1 | 11.0 ppb |
| 2018-04-17 | AA83544-DBP1 | 4.00 ppb |
| 2018-04-17 | AA83545-DBP1 | 13.0 ppb |
| 2018-04-17 | AA83546-DBP1 | 8.10 ppb |
| 2018-04-17 | AA83547-DBP1 | 8.40 ppb |
| 2018-04-17 | AA83548-DBP1 | 5.90 ppb |
| 2018-07-16 | AA84694-DBP1 | 4.80 ppb |
| 2018-07-16 | AA84706-DBP1 | 25.0 ppb |
| 2018-07-17 | AA84723-DBP1 | 17.0 ppb |
| 2018-07-17 | AA84724-DBP1 | 13.0 ppb |
| 2018-07-17 | AA84725-DBP1 | 16.0 ppb |
| 2018-07-17 | AA84726-DBP1 | 8.80 ppb |
| 2018-07-17 | AA84727-DBP1 | 38.0 ppb |
| 2018-07-17 | AA84729-DBP1 | 20.0 ppb |
| 2018-07-17 | AA84728-VOC1 | ND |
| 2018-07-18 | AA84742-VOC1 | ND |
| 2018-07-18 | AA84743-VOC1 | ND |
| 2018-10-15 | AA85872-DBP1 | 12.0 ppb |
| 2018-10-15 | AA85873-DBP1 | 16.0 ppb |
| 2018-10-15 | AA85874-DBP1 | 26.0 ppb |
| 2018-10-15 | AA85924-DBP1 | 16.0 ppb |
| 2018-10-16 | AA85880-DBP1 | 7.80 ppb |
| 2018-10-16 | AA85882-DBP1 | 6.10 ppb |
| 2018-10-16 | AA85893-DBP1 | 29.0 ppb |
| 2018-10-16 | AA85887-VOC1 | ND |
| 2018-10-17 | AA85906-VOC1 | ND |
| 2018-10-17 | AA85907-VOC1 | ND |
| 2018-10-18 | AA85923-DBP1 | 28.0 ppb |
| 2019-01-14 | AA86944-DBP1 | 11.0 ppb |
| 2019-01-14 | AA86945-DBP1 | 2.50 ppb |
| 2019-01-15 | AA86953-DBP1 | 3.70 ppb |
| 2019-01-15 | AA86960-DBP1 | 3.90 ppb |
| 2019-01-15 | AA86961-DBP1 | 9.40 ppb |
| 2019-01-15 | AA86962-DBP1 | 5.90 ppb |
| 2019-01-15 | AA86956-VOC1 | ND |
| 2019-01-15 | AA86957-VOC1 | ND |
| 2019-01-16 | AA86968-DBP1 | 1.40 ppb |
| 2019-01-16 | AA86978-DBP1 | 8.70 ppb |
| 2019-01-16 | AA86968-VOC1 | 0.510 ppb |
| 2019-01-16 | AA86974-VOC1 | ND |
| 2019-01-16 | AA86975-VOC1 | ND |
| 2019-01-17 | AA86989-VOC1 | ND |
| 2019-01-17 | AA86990-VOC1 | ND |
| 2019-04-15 | AA88012-DBP1 | 4.01 ppb |
| 2019-04-15 | AA88021-DBP1 | 8.01 ppb |
| 2019-04-15 | AA88022-DBP1 | 12.7 ppb |
| 2019-04-15 | AA88023-DBP1 | 11.8 ppb |
| 2019-04-15 | AA88024-DBP1 | 11.9 ppb |
| 2019-04-15 | AA88025-DBP1 | 21.0 ppb |
| 2019-04-17 | AA88059-DBP1 | 13.1 ppb |
| 2019-04-17 | AA88060-DBP1 | 7.68 ppb |
| 2019-04-23 | AA88123-VOC1 | ND |
| 2019-04-24 | AA88139-VOC1 | ND |
| 2019-04-24 | AA88140-VOC1 | ND |
| 2019-07-08 | AA89073-VOC1 | ND |
| 2019-07-08 | AA89074-VOC1 | ND |
| 2019-07-10 | AA89110-VOC1 | ND |
| 2019-07-15 | AA89173-DBP1 | 14.2 ppb |
| 2019-07-15 | AA89174-DBP1 | 12.8 ppb |
| 2019-07-15 | AA89175-DBP1 | 19.7 ppb |
| 2019-07-15 | AA89176-DBP1 | 32.9 ppb |
| 2019-07-15 | AA89177-DBP1 | 19.6 ppb |
| 2019-07-16 | AA89183-DBP1 | 9.46 ppb |
| 2019-07-16 | AA89193-DBP1 | 2.14 ppb |
| 2019-07-16 | AA89194-DBP1 | 24.7 ppb |
| 2019-10-08 | AA90268-VOC1 | ND |
| 2019-10-09 | AA90285-VOC1 | ND |
| 2019-10-09 | AA90287-VOC1 | 0.670 ppb |
| 2019-10-15 | AA90342-DBP1 | 16.0 ppb |
| 2019-10-15 | AA90344-DBP1 | 33.9 ppb |
| 2019-10-15 | AA90353-DBP1 | 44.8 ppb |
| 2019-10-15 | AA90354-DBP1 | 56.0 ppb |
| 2019-10-15 | AA90355-DBP1 | 18.0 ppb |
| 2019-10-15 | AA90356-DBP1 | 22.1 ppb |
| 2019-10-15 | AA90357-DBP1 | 21.5 ppb |
| 2019-10-15 | AA90358-DBP1 | 36.5 ppb |
| 2020-01-13 | AA91414-DBP1 | 18.3 ppb |
| 2020-01-13 | AA91415-DBP1 | 11.5 ppb |
| 2020-01-13 | AA91416-DBP1 | 7.03 ppb |
| 2020-01-14 | AA91431-DBP1 | 13.3 ppb |
| 2020-01-14 | AA91436-DBP1 | 28.2 ppb |
| 2020-01-14 | AA91437-DBP1 | 26.1 ppb |
| 2020-01-15 | AA91452-DBP1 | 9.24 ppb |
| 2020-01-15 | AA91455-DBP1 | 10.00 ppb |
| 2020-01-21 | AA91524-VOC1 | ND |
| 2020-01-21 | AA91525-VOC1 | ND |
| 2020-01-21 | AA91522-VOC1 | 1.04 ppb |
| 2020-01-21 | AA91523-VOC1 | ND |
| 2020-01-21 | AA91526-VOC1 | ND |
| 2020-01-22 | AA91540-VOC1 | ND |
| 2020-01-23 | AA91552-VOC1 | 3.19 ppb |
| 2020-04-14 | AA92514-DBP1 | 15.6 ppb |
| 2020-04-14 | AA92515-DBP1 | 7.90 ppb |
| 2020-04-14 | AA92517-DBP1 | 13.9 ppb |
| 2020-04-14 | AA92529-DBP1 | 29.4 ppb |
| 2020-04-14 | AA92530-DBP1 | 19.3 ppb |
| 2020-04-14 | AA92531-DBP1 | 14.6 ppb |
| 2020-04-14 | AA92532-DBP1 | 21.7 ppb |
| 2020-04-14 | AA92522-VOC1 | ND |
| 2020-04-14 | AA92524-VOC1 | ND |
| 2020-04-15 | AA92551-DBP1 | 16.6 ppb |
| 2020-04-15 | AA92546-VOC1 | ND |
| 2020-07-07 | AA93640-VOC1 | ND |
| 2020-07-07 | AA93643-VOC1 | ND |
| 2020-07-07 | AA93644-VOC1 | ND |
| 2020-07-14 | AA93734-DBP1 | 2.23 ppb |
| 2020-07-14 | AA93738-DBP1 | 19.9 ppb |
| 2020-07-14 | AA93739-DBP1 | 14.5 ppb |
| 2020-07-14 | AA93740-DBP1 | 31.5 ppb |
| 2020-07-14 | AA93741-DBP1 | 20.2 ppb |
| 2020-07-14 | AA93742-DBP1 | 14.2 ppb |
| 2020-07-15 | AA93758-DBP1 | 11.9 ppb |
| 2020-07-15 | AA93771-DBP1 | 27.6 ppb |
| 2020-10-05 | AA95052-DBP1 | 15.4 ppb |
| 2020-10-05 | AA95050-DBP1 | 45.9 ppb |
| 2020-10-05 | AA95051-DBP1 | 37.8 ppb |
| 2020-10-05 | AA95053-DBP1 | 21.7 ppb |
| 2020-10-05 | AA95054-DBP1 | 20.6 ppb |
| 2020-10-06 | AA95060-DBP1 | 16.2 ppb |
| 2020-10-06 | AA95062-DBP1 | 26.9 ppb |
| 2020-10-07 | AA95096-DBP1 | 17.4 ppb |
| 2020-10-13 | AA95168-VOC1 | ND |
| 2020-10-14 | AA95186-VOC1 | ND |
| 2020-10-14 | AA95187-VOC1 | ND |
| 2021-01-12 | 210112-2-02 TTHM | 3.59 ppb |
| 2021-01-12 | 210112-5-01TTHM | 17.4 ppb |
| 2021-01-12 | 210112-5-02TTHM | 20.9 ppb |
| 2021-01-12 | 210112-3-04 VOC | ND |
| 2021-01-13 | 210113-2-02 TTHM | 14.3 ppb |
| 2021-01-13 | 210113-4-01TTHM | 13.0 ppb |
| 2021-01-13 | 210113-4-02TTHM | 22.7 ppb |
| 2021-01-14 | 210114-4-01TTHM | 7.38 ppb |
| 2021-01-14 | 210114-4-02TTHM | 7.79 ppb |
| 2021-01-20 | 210120-3-05 VOC | ND |
| 2021-01-20 | 210120-3-06 VOC | ND |
| 2021-04-05 | 210405-4-01TTHM | 31.8 ppb |
| 2021-04-05 | 210405-4-02TTHM | 16.8 ppb |
| 2021-04-06 | 210406-4-01TTHM | 11.0 ppb |
| 2021-04-06 | 210406-4-02TTHM | 11.7 ppb |
| 2021-04-06 | 210406-4-03TTHM | 17.6 ppb |
| 2021-04-06 | 210406-4-04TTHM | 5.07 ppb |
| 2021-04-07 | 210407-5-01TTHM | 7.73 ppb |
| 2021-04-09 | 210409-3-01TTHM | 23.6 ppb |
| 2021-04-12 | 210412-3-01VOC | ND |
| 2021-04-12 | 210412-3-02 VOC | ND |
| 2021-04-12 | 210412-3-04 VOC | ND |
| 2021-04-12 | 210412-3-05 VOC | ND |
| 2021-04-13 | 210413-3-03 VOC | 0.710 ppb |
| 2021-04-14 | 210414-1-06VOC | 0.620 ppb |
| 2021-04-14 | 210414-3-06VOC | 0.620 ppb |
| 2021-07-13 | 210713-4-01TTHM | 20.9 ppb |
| 2021-07-13 | 210713-4-02TTHM | 18.1 ppb |
| 2021-07-13 | 210713-4-03TTHM | 33.1 ppb |
| 2021-07-13 | 210713-4-04TTHM | 22.5 ppb |
| 2021-07-13 | 210713-4-05TTHM | 20.9 ppb |
| 2021-07-13 | 210713-4-06TTHM | 13.3 ppb |
| 2021-07-13 | 210713-4-07TTHM | 65.9 ppb |
| 2021-07-14 | 210714-1-06 TTHM | 13.4 ppb |
| 2021-07-14 | 210714-3-04 VOC | ND |
| 2021-07-14 | 210714-3-05 VOC | ND |
| 2021-07-14 | 210714-3-06 VOC | ND |
| 2021-10-05 | 211005-4-01TTHM | 15.5 ppb |
| 2021-10-05 | 211005-4-02TTHM | 28.0 ppb |
| 2021-10-05 | 211005-4-03TTHM | 26.8 ppb |
| 2021-10-06 | 211006-4-01TTHM | 54.5 ppb |
| 2021-10-06 | 211006-4-02TTHM | 16.4 ppb |
| 2021-10-06 | 211006-4-03TTHM | 36.4 ppb |
| 2021-10-06 | 211006-4-04TTHM | 22.7 ppb |
| 2021-10-07 | 211007-4-01TTHM | 40.0 ppb |
| 2021-10-12 | 211012-3-04 VOC | ND |
| 2021-10-12 | 211012-3-05 VOC | ND |
| 2021-10-13 | 211013-3-06 VOC | 1.48 ppb |
| 2022-01-04 | 220104-3-04 VOC | ND |
| 2022-01-05 | 220105-3-05 VOC | ND |
| 2022-01-05 | 220105-3-06 VOC | ND |
| 2022-01-10 | 220110-4-01TTHM | 7.82 ppb |
| 2022-01-10 | 220110-4-02TTHM | 11.1 ppb |
| 2022-01-11 | 220111-4-01TTHM | 25.5 ppb |
| 2022-01-11 | 220111-4-02TTHM | 26.5 ppb |
| 2022-01-11 | 220111-4-03TTHM | 11.5 ppb |
| 2022-01-11 | 220111-4-04TTHM | 8.56 ppb |
| 2022-01-11 | 220111-4-05TTHM | 31.3 ppb |
| 2022-01-11 | 220111-4-06TTHM | 13.1 ppb |
| 2022-04-05 | 220405-2-02 TTHM | 3.49 ppb |
| 2022-04-05 | 220405-4-01TTHM | 9.54 ppb |
| 2022-04-05 | 220405-4-02TTHM | 30.5 ppb |
| 2022-04-05 | 220405-4-03TTHM | 17.6 ppb |
| 2022-04-05 | 220405-4-04TTHM | 9.90 ppb |
| 2022-04-05 | 220405-4-05TTHM | 10.7 ppb |
| 2022-04-05 | 220405-4-06TTHM | 15.1 ppb |
| 2022-04-05 | 220405-4-07TTHM | 6.26 ppb |
| 2022-04-13 | 220413-3-04 VOC | ND |
| 2022-04-13 | 220413-3-05 VOC | ND |
| 2022-04-13 | 220413-3-06 VOC | ND |
| 2022-07-06 | 220706-3-05VOC | ND |
| 2022-07-06 | 220706-4-01VOC | ND |
| 2022-07-12 | 220712-5-01TTHM | 31.1 ppb |
| 2022-07-12 | 220712-5-02TTHM | 23.3 ppb |
| 2022-07-12 | 220712-5-03TTHM | 26.2 ppb |
| 2022-07-12 | 220712-5-04TTHM | 31.7 ppb |
| 2022-07-12 | 220712-5-05TTHM | 33.8 ppb |
| 2022-07-12 | 220712-5-06TTHM | 6.04 ppb |
| 2022-07-12 | 220712-5-07TTHM | 42.8 ppb |
| 2022-07-12 | 220712-5-08TTHM | 12.0 ppb |
| 2022-07-18 | 220718-3-01VOC | ND |
| 2022-07-18 | 220718-3-02 VOC | ND |
| 2022-07-19 | 220719-1-06 VOC | 10.1 ppb |
| 2022-07-19 | 220719-3-03 VOC | ND |
| 2022-07-19 | 220719-3-04 VOC | ND |
| 2022-10-04 | 221004-4-01TTHM | 23.2 ppb |
| 2022-10-04 | 221004-4-02TTHM | 47.2 ppb |
| 2022-10-04 | 221004-4-03TTHM | 13.5 ppb |
| 2022-10-04 | 221004-4-04TTHM | 15.9 ppb |
| 2022-10-04 | 221004-4-05TTHM | 38.6 ppb |
| 2022-10-04 | 221004-4-06TTHM | 30.5 ppb |
| 2022-10-04 | 221004-4-07TTHM | 7.28 ppb |
| 2022-10-05 | 221005-5-01TTHM | 11.1 ppb |
| 2022-10-11 | 221011-3-04 VOC | ND |
| 2022-10-12 | 221012-3-05 VOC | ND |
| 2022-10-12 | 221012-3-06 VOC | 0.630 ppb |
| 2023-01-09 | 230109-5-01TTHM | 45.3 ppb |
| 2023-01-09 | 230109-5-02TTHM | 21.7 ppb |
| 2023-01-10 | 230110-5-01TTHM | 5.45 ppb |
| 2023-01-10 | 230110-5-02TTHM | 27.2 ppb |
| 2023-01-10 | 230110-5-03TTHM | 12.5 ppb |
| 2023-01-10 | 230110-5-04TTHM | 17.2 ppb |
| 2023-01-10 | 230110-5-05TTHM | 29.5 ppb |
| 2023-01-12 | 230112-4-01TTHM | 8.59 ppb |
| 2023-01-17 | 230117-3-03 VOC | ND |
| 2023-01-17 | 230117-3-04 VOC | ND |
| 2023-01-19 | 230119-3-06 VOC | 1.11 ppb |
| 2023-01-31 | 230131-3-07VOC | ND |
| 2023-04-03 | 230403-3-05VOC | ND |
| 2023-04-04 | 230404-3-06VOC | ND |
| 2023-04-05 | 230405-3-04VOC | ND |
| 2023-04-11 | 230411-8-01TTHM | 2.03 ppb |
| 2023-04-11 | 230413-4-01TTHM | 15.8 ppb |
| 2023-04-11 | 230413-4-02TTHM | 28.7 ppb |
| 2023-04-12 | 230414-3-01TTHM | 30.2 ppb |
| 2023-04-12 | 230414-3-02TTHM | 1.07 ppb |
| 2023-04-12 | 230414-3-03TTHM | 11.2 ppb |
| 2023-04-12 | 230414-3-04TTHM | 15.0 ppb |
| 2023-04-13 | 230413-4-03TTHM | 12.6 ppb |
| 2023-07-10 | 230710-5-01TTHM | 19.7 ppb |
| 2023-07-10 | 230710-5-02TTHM | 9.02 ppb |
| 2023-07-11 | 230711-4-01TTHM | 32.9 ppb |
| 2023-07-11 | 230711-4-02TTHM | 21.7 ppb |
| 2023-07-11 | 230711-4-03TTHM | 14.8 ppb |
| 2023-07-11 | 230711-4-04TTHM | 12.4 ppb |
| 2023-07-11 | 230711-4-05TTHM | 24.8 ppb |
| 2023-07-11 | 230711-4-06TTHM | 7.61 ppb |
| 2023-07-17 | 230717-3-01VOC | ND |
| 2023-07-17 | 230717-3-02 VOC | ND |
| 2023-07-17 | 230717-3-03 VOC | ND |
| 2023-07-17 | 230717-3-04 VOC | ND |
| 2023-07-17 | 230717-3-05 VOC | ND |
| 2023-07-19 | 230719-3-06 VOC | ND |
| 2023-09-07 | 230907-1-06VOC | 14.0 ppb |
| 2023-10-02 | 231002-3-04VOC | ND |
| 2023-10-02 | 231002-3-05VOC | ND |
| 2023-10-04 | 231004-3-06VOC | ND |
| 2023-10-10 | 231010-5-01TTHM | 31.3 ppb |
| 2023-10-10 | 231010-5-02TTHM | 20.4 ppb |
| 2023-10-10 | 231010-5-03TTHM | 29.4 ppb |
| 2023-10-10 | 231010-5-04TTHM | 22.4 ppb |
| 2023-10-11 | 231011-4-01TTHM | 1.23 ppb |
| 2023-10-11 | 231011-4-02TTHM | 34.2 ppb |
| 2023-10-11 | 231011-4-03TTHM | 13.9 ppb |
| 2023-10-11 | 231011-4-04TTHM | 11.5 ppb |