Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

CTWC - Unionville System

NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for hexachlorocyclopentadiene. Sample information shown below was taken by Metropolitan District Commission.

Hexachlorocyclopentadiene was historically used for the manufacture of currently banned pesticides, such as endrin, dieldrin and chlordane. It’s still used for production of flame retardants, resins and plastics.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND120ND
2020ND30ND
2021ND30ND
2022ND60ND
2023ND30ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 2 ppb

The EWG Health Guideline of 2 ppb for hexachlorocyclopentadiene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to the stomach and intestines.

EPA Maximum Contaminant
Level (MCL): 50 ppb

The legal limit for hexachlorocyclopentadiene, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for hexachlorocyclopentadiene. Sample information shown below was taken by Metropolitan District Commission.

Date Lab ID Result
2018-06-27CA79476ND
2018-06-27CA79477ND
2018-06-27CA79475ND
2018-09-25CB38504ND
2018-09-25CB38505RND
2018-09-25CB38869ND
2018-09-25CB38505ND
2020-12-08SOC 200600638ND
2020-12-08SOC 200600609ND
2020-12-09SOC 200600592ND
2021-11-23S300107511 300107513ND
2021-11-23S300107593 300107596ND
2021-11-29S300109627 300109629ND
2022-12-15S300287039 300287044ND
2022-12-15S300287062 300287065ND
2022-12-15S300287090 300287093ND
2023-12-05S300456329 300456332ND
2023-12-06S300456308 300456311ND
2023-12-06S300456298 300456301ND