cis-1,2-Dichloroethylene

Rockford

1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.

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113

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.671 ppb	22	6	ND - 8.40 ppb
2015	1.86 ppb	18	6	ND - 9.70 ppb
2016	2.93 ppb	11	4	ND - 13.0 ppb
2017	1.72 ppb	25	10	ND - 10.00 ppb
2018	2.45 ppb	26	8	ND - 24.8 ppb
2019	1.62 ppb	11	3	ND - 11.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 70 ppb

The legal limit for cis-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-21	4012700-05	ND
2014-01-21	4012700-06	ND
2014-01-22	4012700-02	ND
2014-01-27	4013503-02	ND
2014-01-31	4020631-01	ND
2014-01-31	4020631-02	ND
2014-01-31	4020631-03	ND
2014-02-18	4022291-01	ND
2014-02-18	4022294-01	ND
2014-02-25	4023202-01	ND
2014-04-03	4040726-01	0.520 ppb
2014-04-03	4040814-01	2.30 ppb
2014-04-16	4042720-01	0.560 ppb
2014-04-16	4042720-04	8.40 ppb
2014-04-16	4042720-05	ND
2014-04-16	4042720-02	2.40 ppb
2014-04-16	4042720-03	ND
2014-07-30	4074475-01	0.590 ppb
2014-10-17	4103510-03	ND
2014-10-17	4103510-02	ND
2014-10-28	4104356-01	ND
2014-12-05	4121752-01	ND
2015-02-06	5021724-01	9.70 ppb
2015-02-18	5022511-03	0.800 ppb
2015-04-08	5041268-01	7.30 ppb
2015-04-15	5042507-02	ND
2015-04-22	5043417-01	ND
2015-05-12	5051947-01	ND
2015-05-12	5051947-02	ND
2015-05-12	5051947-04	ND
2015-05-20	5053045-02	ND
2015-06-03	5060645-01	ND
2015-06-17	5062896-01	ND
2015-06-23	5063877-01	8.80 ppb
2015-07-29	5074562-01	ND
2015-10-27	5104115-02	ND
2015-10-27	5104115-03	1.10 ppb
2015-11-04	5110645-05	5.70 ppb
2015-11-04	5110645-06	ND
2015-11-18	5112827-01	ND
2016-03-02	6030509-01	ND
2016-04-13	6042243-01	ND
2016-04-26	6044110-02	ND
2016-05-06	6051786-01	5.90 ppb
2016-06-08	6061435-01	ND
2016-08-10	6082098-01	13.0 ppb
2016-08-17	6083403-01	ND
2016-10-12	6102040-01	ND
2016-10-31	6110515-01	12.0 ppb
2016-11-09	6111726-03	ND
2016-11-09	6111726-04	1.30 ppb
2017-01-06	7011622-01	ND
2017-01-06	7011622-02	ND
2017-01-13	7012600-02	ND
2017-01-13	7012603-01	1.60 ppb
2017-01-13	7012603-03	ND
2017-01-20	7013468-03	ND
2017-01-20	7013468-04	ND
2017-01-20	7013468-01	ND
2017-01-20	7013468-02	ND
2017-01-27	7020195-01	0.580 ppb
2017-02-03	7021369-02	ND
2017-02-10	7022427-01	ND
2017-03-15	7032200-01	5.50 ppb
2017-05-26	7060081-03	6.00 ppb
2017-05-26	7060081-01	ND
2017-06-09	7062750-05	9.20 ppb
2017-06-27	7064968-01	0.660 ppb
2017-06-28	7065205-01	ND
2017-09-22	7094621-01	ND
2017-10-20	7104443-02	ND
2017-10-20	7104443-01	ND
2017-10-27	7110218-01	10.00 ppb
2017-11-09	7112882-01	0.560 ppb
2017-12-06	7121184-01	8.10 ppb
2017-12-06	7121184-04	0.700 ppb
2018-01-29	18A0571-01_02	9.91 ppb
2018-01-29	18A0571-02_02	ND
2018-02-02	8021162-01	9.10 ppb
2018-03-16	8033673-01	0.610 ppb
2018-03-16	8033673-02	ND
2018-04-06	8042289-01	8.20 ppb
2018-04-06	8042289-02	ND
2018-04-06	8042289-03	ND
2018-05-04	8051899-01	ND
2018-05-04	8051899-02	ND
2018-05-23	8054284-01	ND
2018-05-23	8054284-02	ND
2018-05-23	8054284-03	ND
2018-05-25	8055076-01	ND
2018-05-25	8055076-02	ND
2018-05-30	18E1190-01_02	24.8 ppb
2018-06-12	8062624-01	0.710 ppb
2018-06-15	8063760-01	ND
2018-09-12	8092119-01	ND
2018-09-12	8092119-02	ND
2018-09-12	8092119-03	0.690 ppb
2018-10-31	18K0014-01_02	ND
2018-11-02	8111425-02	ND
2018-12-05	18L0178-01_02	ND
2018-12-18	8123625-01	ND
2018-12-18	8123625-03	9.60 ppb
2019-03-13	9032319-01	0.770 ppb
2019-03-13	9032319-02	ND
2019-04-26	9050293-01	ND
2019-04-26	9050293-02	ND
2019-04-26	9050293-03	ND
2019-05-20	9054685-01	ND
2019-05-20	9054685-02	6.00 ppb
2019-11-08	9112291-01	ND
2019-11-08	9112291-02	ND
2019-11-08	9112291-04	11.0 ppb
2019-11-08	9112291-06	ND