Hexachlorocyclopentadiene

Truckee Meadows Water Authority

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.

MORE ABOUT THIS CONTAMINANT

200

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	ND	26	0	ND
2015	ND	17	0	ND
2016	0.00161 ppb	31	1	ND - 0.0500 ppb
2017	ND	51	0	ND
2018	ND	41	0	ND
2019	0 ppb	34	2	ND - 0.0700 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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

Date	Lab ID	Result
2014-04-22	0414-13-S	ND
2014-04-22	0414-12-S	ND
2014-04-22	0414-16-S	ND
2014-04-23	0414-17-S	ND
2014-06-09	0614-06-S	ND
2014-06-09	0614-07-S	ND
2014-06-17	0614-11-S	ND
2014-06-17	0614-10-S	ND
2014-06-17	0614-09-S	ND
2014-06-17	0614-12-S	ND
2014-06-17	0614-13-S	ND
2014-06-17	0614-14-S	ND
2014-07-29	0714-32	ND
2014-07-29	0714-33-S	ND
2014-07-29	0714-34-S	ND
2014-07-29	0714-35-S	ND
2014-07-29	0714-36-S	ND
2014-07-29	0714-37-S	ND
2014-07-30	0714-47-S	ND
2014-07-30	0714-46-S	ND
2014-07-30	0714-45-S	ND
2014-07-30	0714-48-S	ND
2014-09-02	0914-07-S	ND
2014-09-02	0914-06-S	ND
2014-09-02	0914-05-S	ND
2014-09-02	0914-06-W18	ND
2015-06-08	1506017-01	ND
2015-06-08	1506018-01	ND
2015-06-11	1506027-SOC	ND
2015-06-17	1506035-01	ND
2015-06-17	1506036-01	ND
2015-06-17	1506037-01	ND
2015-06-17	1506038-01	ND
2015-06-23	1506055-01	ND
2015-06-23	1506061-01	ND
2015-07-22	1507046-EUR	ND
2015-07-22	1507045-EUR	ND
2015-08-19	1508047-EUR	ND
2015-08-19	1508048-EUR	ND
2015-08-19	1508050-EUR	ND
2015-08-19	1508051-EUR	ND
2015-08-19	1508053-EUR	ND
2015-08-19	1508054-EUR	ND
2016-03-01	1603002-01EUR	ND
2016-05-31	1605028-01EUR	ND
2016-05-31	1605025-01EUR	ND
2016-05-31	1605026-01EUR	ND
2016-05-31	1605027-01EUR	ND
2016-06-01	1606001-01EUR	0.0500 ppb
2016-06-06	1606010-01EUR	ND
2016-06-06	1606013-01EUR	ND
2016-07-19	1607022-01EUR	ND
2016-07-19	1607021-01EUR	ND
2016-07-19	1607026-01EUR	ND
2016-07-19	1607023-01EUR	ND
2016-07-19	1607024-01EUR	ND
2016-07-19	1607025-01EUR	ND
2016-08-24	1608035-01EUR	ND
2016-08-24	1608034-01EUR	ND
2016-08-24	1608033-01EUR	ND
2016-08-25	1608036-01EUR	ND
2016-09-13	1609006-01EUR	ND
2016-09-13	1609007-01EUR	ND
2016-09-13	1609008-01EUR	ND
2016-09-13	1609009-01EUR	ND
2016-09-22	1609024-01EUR	ND
2016-10-12	1610015-01EUR	ND
2016-10-12	1610014-01EUR	ND
2016-10-12	1610012-01EUR	ND
2016-10-12	1610011-01EUR	ND
2016-10-12	1610016-01EUR	ND
2016-10-13	1610017-01EUR	ND
2016-10-18	1610027-01EUR	ND
2016-10-25	1610039-01EUR	ND
2017-01-11	1701006-01EUR	ND
2017-03-08	1703010-01EUR	ND
2017-03-08	1703009-01EUR	ND
2017-03-08	1703008-01EUR	ND
2017-05-02	1705003-01EUR	ND
2017-05-02	1705004-01EUR	ND
2017-05-03	1705010-01EUR	ND
2017-05-03	1705009-01EUR	ND
2017-05-15	1705022-01EUR	ND
2017-05-15	1705023-01EUR	ND
2017-05-15	1705025-01EUR	ND
2017-05-15	1705024-01EUR	ND
2017-05-25	1705042-01EUR	ND
2017-05-25	1705041-01EUR	ND
2017-07-11	1707003-01EUR	ND
2017-07-11	1707002-01EUR	ND
2017-07-11	1707005-01EUR	ND
2017-07-11	1707004-01EUR	ND
2017-07-12	1707010-01EUR	ND
2017-07-12	1707012-01EUR	ND
2017-07-12	1707008-01EUR	ND
2017-07-18	1707020-01EUR	ND
2017-07-18	1707021-01EUR	ND
2017-07-18	1707022-01EUR	ND
2017-07-18	1707023-01EUR	ND
2017-08-16	1708013-01EUR	ND
2017-08-16	1708014-01EUR	ND
2017-09-12	1708026-02EUR	ND
2017-09-12	1708028-02EUR	ND
2017-09-12	1708027-02EUR	ND
2017-09-12	1708029-02EUR	ND
2017-09-12	1708025-02EUR	ND
2017-10-10	1710015-01EUR	ND
2017-10-10	1710009-01EUR	ND
2017-10-10	1710014-01EUR	ND
2017-10-10	1710016-01EUR	ND
2017-10-10	1710017-01EUR	ND
2017-10-10	1710018-01EUR	ND
2017-10-25	1710032-01EUR	ND
2017-10-25	1710033-01EUR	ND
2017-10-25	1710035-01EUR	ND
2017-10-25	1710036-01EUR	ND
2017-10-31	1710048-01EUR	ND
2017-10-31	1710049-01EUR	ND
2017-11-01	1711001-01EUR	ND
2017-11-17	1712011-01EUR	ND
2017-11-17	1712010-01EUR	ND
2017-11-17	1712009-01EUR	ND
2017-12-04	1712032-01EUR	ND
2017-12-05	1712023-01EUR	ND
2017-12-05	1712021-01EUR	ND
2018-01-23	1801009-01EUR	ND
2018-01-23	1801010-01EUR	ND
2018-02-01	1802001-01EUR	ND
2018-02-01	1802003-01EUR	ND
2018-02-06	1802006-01EUR	ND
2018-02-07	1802007-01EUR	ND
2018-04-04	1804005-01WEC	ND
2018-04-04	1804006-01EUR	ND
2018-04-04	1804007-01EUR	ND
2018-04-09	1804011-01WEC	ND
2018-04-09	1804012-01WEC	ND
2018-04-10	1804036-01EUR	ND
2018-04-11	1804017-01WEC	ND
2018-04-11	1804018-01WEC	ND
2018-04-11	1804019-01WEC	ND
2018-04-24	1804027-01WEC	ND
2018-04-25	1804025-01WEC	ND
2018-04-26	1804044-01WEC	ND
2018-05-02	1805008-01EUR	ND
2018-05-02	1805009-01EUR	ND
2018-05-02	1805010-01EUR	ND
2018-05-23	1805041-01WEC	ND
2018-06-05	1806009-01WEC	ND
2018-07-09	1807007-01WEC	ND
2018-07-09	1807008-01WEC	ND
2018-07-24	1807025-01WEC	ND
2018-08-07	1808008-01WEC	ND
2018-08-07	1808009-01WEC	ND
2018-08-07	1808010-01WEC	ND
2018-08-07	1808011-01WEC	ND
2018-08-07	1808012-01WEC	ND
2018-08-07	1808013-01WEC	ND
2018-08-14	1808024-01WEC	ND
2018-08-14	1808025-01WEC	ND
2018-10-10	1810015-02WEC	ND
2018-10-24	1810032-01WEC	ND
2018-10-24	1810033-01WEC	ND
2018-10-24	1810035-01WEC	ND
2018-10-24	1810036-01WEC	ND
2018-10-24	1810037-01WEC	ND
2018-10-24	1810038-01WEC	ND
2019-01-09	1901012-02WEC	0.0700 ppb
2019-01-09	1901013-02WEC	ND
2019-01-16	1901017-02WEC	ND
2019-02-05	1902001-01WEC	ND
2019-02-26	1902019-01WEC	ND
2019-04-08	1904004-01WEC	ND
2019-05-07	1905007-01WEC	ND
2019-05-07	1905008-01WEC	ND
2019-05-29	1905027-01WEC	ND
2019-06-01		0 ppb*
2019-06-19	1906013-01WEC	ND
2019-06-19	1906014-01WEC	ND
2019-06-19	1906015-01WEC	ND
2019-06-19	1906016-01WEC	ND
2019-06-27	1906021-01WEC	ND
2019-06-27	1906022-01WEC	ND
2019-06-27	1906023-01WEC	ND
2019-07-01	1907003-01WEC	ND
2019-07-01	1907004-01WEC	ND
2019-07-01	1907005-01WEC	ND
2019-07-01	1907006-01WEC	ND
2019-07-01	1907012-01WEC	ND
2019-07-09	1907014-02WEC	ND
2019-07-25	1907045-01WEC	ND
2019-07-29	1907046-01WEC	ND
2019-07-30	1907048-01WEC	ND
2019-08-06	1908002-01WEC	ND
2019-08-06	1908004-01WEC	ND
2019-08-06	1908007-01WEC	ND
2019-08-07	1908008-02WEC	ND
2019-08-07	1908009-02WEC	ND
2019-08-07	1908010-02WEC	ND
2019-10-01	1910004-01WEC	ND
2019-10-01	1910006-01WEC	ND

* Sample result is taken from the system's CCR report.