Know Your Environment. Protect Your Health.

Chloroform

City of Tacoma

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.

Click here to read more about disinfection byproducts.

 

294

Samples

0

Samples exceeding legal limit (MCL)

282

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20187.28 ppb5958ND - 24.0 ppb
201910.5 ppb5149ND - 23.0 ppb
2020N/A00N/A
20217.57 ppb5955ND - 20.1 ppb
20228.57 ppb5653ND - 19.9 ppb
20237.36 ppb6967ND - 15.5 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
2018-01-027.10 ppb
2018-01-027.20 ppb
2018-01-0210.00 ppb
2018-01-026.00 ppb
2018-01-025.30 ppb
2018-01-025.70 ppb
2018-01-029.00 ppb
2018-01-026.00 ppb
2018-01-027.90 ppb
2018-01-027.90 ppb
2018-01-024.40 ppb
2018-01-035.30 ppb
2018-01-032.00 ppb
2018-01-032.30 ppb
2018-01-034.00 ppb
2018-02-07ND
2018-03-120.830 ppb
2018-03-190.540 ppb
2018-04-025.20 ppb
2018-04-027.80 ppb
2018-04-028.80 ppb
2018-04-026.60 ppb
2018-04-026.70 ppb
2018-04-028.60 ppb
2018-04-026.50 ppb
2018-04-028.70 ppb
2018-04-026.60 ppb
2018-04-027.80 ppb
2018-04-023.00 ppb
2018-04-024.70 ppb
2018-04-032.60 ppb
2018-04-034.90 ppb
2018-07-025.90 ppb
2018-07-027.80 ppb
2018-07-027.70 ppb
2018-07-022.50 ppb
2018-07-023.00 ppb
2018-07-025.70 ppb
2018-07-026.20 ppb
2018-07-037.00 ppb
2018-07-039.50 ppb
2018-07-036.50 ppb
2018-07-037.60 ppb
2018-07-039.80 ppb
2018-07-037.80 ppb
2018-07-0313.0 ppb
2018-07-037.10 ppb
2018-10-3010.00 ppb
2018-10-3012.0 ppb
2018-10-3012.0 ppb
2018-10-309.80 ppb
2018-10-3011.0 ppb
2018-10-319.80 ppb
2018-10-3111.0 ppb
2018-10-3124.0 ppb
2018-10-3111.0 ppb
2018-10-3111.0 ppb
2018-10-3111.0 ppb
2018-10-3110.00 ppb
2019-01-02ND
2019-01-148.00 ppb
2019-01-1413.0 ppb
2019-01-147.50 ppb
2019-01-1420.0 ppb
2019-01-146.90 ppb
2019-01-1412.0 ppb
2019-01-147.30 ppb
2019-01-147.30 ppb
2019-01-147.10 ppb
2019-01-149.40 ppb
2019-01-146.20 ppb
2019-01-156.30 ppb
2019-04-019.70 ppb
2019-04-019.40 ppb
2019-04-0112.0 ppb
2019-04-019.40 ppb
2019-04-018.70 ppb
2019-04-018.50 ppb
2019-04-0112.0 ppb
2019-04-018.40 ppb
2019-04-018.90 ppb
2019-04-0112.0 ppb
2019-04-018.80 ppb
2019-04-037.30 ppb
2019-07-087.20 ppb
2019-07-088.20 ppb
2019-07-0811.0 ppb
2019-07-088.30 ppb
2019-07-088.20 ppb
2019-07-088.30 ppb
2019-07-0812.0 ppb
2019-07-088.40 ppb
2019-07-0812.0 ppb
2019-07-0811.0 ppb
2019-07-088.60 ppb
2019-07-087.80 ppb
2019-07-240.770 ppb
2019-10-0116.0 ppb
2019-10-0117.0 ppb
2019-10-0116.0 ppb
2019-10-0115.0 ppb
2019-10-0211.0 ppb
2019-10-0217.0 ppb
2019-10-0223.0 ppb
2019-10-0216.0 ppb
2019-10-0219.0 ppb
2019-10-0222.0 ppb
2019-10-0213.0 ppb
2019-10-0215.0 ppb
2019-12-03ND
2021-01-0440612225.70 ppb
2021-01-0440612244.70 ppb
2021-01-0440612288.40 ppb
2021-01-0440612265.20 ppb
2021-01-0440612315.60 ppb
2021-01-0440612274.60 ppb
2021-01-0440612299.70 ppb
2021-01-0440612324.20 ppb
2021-01-0440612306.30 ppb
2021-01-0440612234.30 ppb
2021-01-0440612255.70 ppb
2021-01-0540612335.80 ppb
2021-04-0540993868.99 ppb
2021-04-0540993798.47 ppb
2021-04-0540993876.06 ppb
2021-04-0540993857.73 ppb
2021-04-0540993787.53 ppb
2021-04-0540993887.13 ppb
2021-04-0540993778.70 ppb
2021-04-0540993827.93 ppb
2021-04-05409938410.9 ppb
2021-04-05409938311.4 ppb
2021-04-0540993817.31 ppb
2021-04-0640993809.18 ppb
2021-06-214137307ND
2021-06-214137308ND
2021-06-214137309ND
2021-06-2142337730.900 ppb
2021-06-304142811ND
2021-07-0641451647.36 ppb
2021-07-0641451686.15 ppb
2021-07-0641451586.11 ppb
2021-07-0641451666.00 ppb
2021-07-0641451652.43 ppb
2021-07-0641451635.51 ppb
2021-07-0641451629.50 ppb
2021-07-0641451592.78 ppb
2021-07-0641451605.50 ppb
2021-07-0741451753.43 ppb
2021-07-0741451733.37 ppb
2021-07-0741451708.76 ppb
2021-07-07414516112.1 ppb
2021-07-07414517210.9 ppb
2021-07-0741451767.35 ppb
2021-10-04419845720.1 ppb
2021-10-0441984669.39 ppb
2021-10-04419845514.0 ppb
2021-10-04419843612.4 ppb
2021-10-04419846311.0 ppb
2021-10-04419846010.3 ppb
2021-10-04419845617.6 ppb
2021-10-04419844211.8 ppb
2021-10-04419845218.0 ppb
2021-10-04419843711.1 ppb
2021-10-05419844714.7 ppb
2021-10-0541984723.31 ppb
2021-10-0541984787.78 ppb
2021-10-0541984753.81 ppb
2021-10-05419846911.9 ppb
2022-01-03422779911.0 ppb
2022-01-0342277877.60 ppb
2022-01-0342278066.15 ppb
2022-01-0342277884.35 ppb
2022-01-0342278123.14 ppb
2022-01-0342278085.08 ppb
2022-01-0342278049.22 ppb
2022-01-0342277974.94 ppb
2022-01-0342277905.27 ppb
2022-01-0342277946.59 ppb
2022-01-0442277916.40 ppb
2022-01-0442278154.59 ppb
2022-04-04427156110.8 ppb
2022-04-0442715687.84 ppb
2022-04-04427155712.9 ppb
2022-04-0442715438.84 ppb
2022-04-0442715419.54 ppb
2022-04-0442715648.14 ppb
2022-04-04427154610.8 ppb
2022-04-04427155413.9 ppb
2022-04-0442715528.86 ppb
2022-04-0442715497.89 ppb
2022-04-0442715656.73 ppb
2022-04-0442715428.15 ppb
2022-07-0543221527.64 ppb
2022-07-0543221518.34 ppb
2022-07-0543221597.30 ppb
2022-07-05432215611.4 ppb
2022-07-0543221509.41 ppb
2022-07-0543221586.27 ppb
2022-07-05432215711.7 ppb
2022-07-0543221557.67 ppb
2022-07-0643221742.33 ppb
2022-07-0643221618.43 ppb
2022-07-0643221765.52 ppb
2022-07-0643221548.86 ppb
2022-07-06432215310.9 ppb
2022-07-0643221752.84 ppb
2022-07-0643221606.37 ppb
2022-09-154368469ND
2022-09-2343684700.610 ppb
2022-10-03437061613.0 ppb
2022-10-03437061919.9 ppb
2022-10-03437061817.7 ppb
2022-10-03437061713.1 ppb
2022-10-03437062011.2 ppb
2022-10-03437061313.6 ppb
2022-10-03437062211.2 ppb
2022-10-03437062114.6 ppb
2022-10-03437061412.2 ppb
2022-10-03437061218.6 ppb
2022-10-04437061516.6 ppb
2022-10-04437062312.4 ppb
2022-10-1143633641.60 ppb
2022-11-154428454ND
2022-11-164388597ND
2023-01-0344153286.48 ppb
2023-01-0344153196.91 ppb
2023-01-0344153266.32 ppb
2023-01-0343992146.48 ppb
2023-01-0343992136.82 ppb
2023-01-0344153358.52 ppb
2023-01-0344153296.82 ppb
2023-01-0343992166.35 ppb
2023-01-0343992096.01 ppb
2023-01-0344153236.35 ppb
2023-01-0344153337.12 ppb
2023-01-0344153345.59 ppb
2023-01-0343992115.59 ppb
2023-01-0344153186.01 ppb
2023-01-0343992127.12 ppb
2023-01-0344153205.99 ppb
2023-01-0343992175.99 ppb
2023-01-0343992108.52 ppb
2023-01-0343992086.91 ppb
2023-01-0343992156.32 ppb
2023-01-0444153377.13 ppb
2023-01-0444153367.45 ppb
2023-01-0443992071.71 ppb
2023-01-0443992037.13 ppb
2023-01-0443992054.95 ppb
2023-01-0443992047.45 ppb
2023-01-0443992061.98 ppb
2023-04-0544442408.95 ppb
2023-04-0544442426.37 ppb
2023-04-0544442446.51 ppb
2023-04-0544442467.31 ppb
2023-04-0544442479.85 ppb
2023-04-0544442498.02 ppb
2023-04-0544442436.48 ppb
2023-04-0544442456.44 ppb
2023-04-0544442399.21 ppb
2023-04-0544442417.86 ppb
2023-04-0544442486.10 ppb
2023-04-0644441341.55 ppb
2023-04-0644441401.86 ppb
2023-04-0644441443.70 ppb
2023-04-0644441284.66 ppb
2023-06-2045429580.640 ppb
2023-07-1045059376.94 ppb
2023-07-1045059738.06 ppb
2023-07-1045059708.37 ppb
2023-07-10450594215.5 ppb
2023-07-1045059566.81 ppb
2023-07-1045059809.09 ppb
2023-07-1045059639.42 ppb
2023-07-1045059409.38 ppb
2023-07-10450598311.4 ppb
2023-07-1045059779.17 ppb
2023-07-1045059667.44 ppb
2023-07-11450596010.2 ppb
2023-07-124542959ND
2023-07-124542960ND
2023-10-02455639511.8 ppb
2023-10-0245563929.37 ppb
2023-10-0245563917.77 ppb
2023-10-0245563947.80 ppb
2023-10-02455639712.8 ppb
2023-10-0245563988.79 ppb
2023-10-02455639615.1 ppb
2023-10-02455638914.8 ppb
2023-10-02455639311.8 ppb
2023-10-02455640014.4 ppb
2023-10-0245563909.69 ppb
2023-10-0245563996.68 ppb