Trichlorofluoromethane

Madison Water Utility

Trichlorofluoromethane (Freon 11) is a refrigerant, solvent and aerosol propellant banned in 2000 under the Montreal Protocol because of its ozone-depleting properties. Freons can cause heart, nervous system and liver damage.

MORE ABOUT THIS CONTAMINANT

194

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	0.0390 ppb	40	2	ND - 0.850 ppb
2015	0.0475 ppb	36	2	ND - 0.940 ppb
2016	0.0345 ppb	22	1	ND - 0.760 ppb
2017	0.0914 ppb	44	5	ND - 1.10 ppb
2018	0.0841 ppb	27	4	ND - 0.630 ppb
2019	0.0480 ppb	25	2	ND - 0.640 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1,300 ppb

The EWG Health Guideline of 1,300 ppb for trichlorofluoromethane 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 internal organs.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-21	767438	ND
2014-01-21	767449	ND
2014-01-21	767448	ND
2014-01-21	767452	ND
2014-01-22	767447	ND
2014-01-22	767443	ND
2014-01-22	767446	ND
2014-01-22	767445	0.710 ppb
2014-02-14	770975	ND
2014-02-17	770977	ND
2014-02-18	770972	ND
2014-02-18	770974	ND
2014-02-18	770973	ND
2014-04-03	778296	ND
2014-04-04	778295	ND
2014-04-07	778297	ND
2014-04-07	778298	ND
2014-04-23	782084	ND
2014-04-23	782088	ND
2014-04-23	782087	ND
2014-04-23	782089	ND
2014-04-23	782085	ND
2014-05-05	784131	ND
2014-05-05	784135	ND
2014-07-14	803096	ND
2014-07-14	803100	ND
2014-07-14	803098	ND
2014-07-14	803097	ND
2014-07-14	803099	0.850 ppb
2014-07-15	803105	ND
2014-07-15	803102	ND
2014-07-15	803101	ND
2014-08-04	808192	ND
2014-08-04	808190	ND
2014-08-04	808191	ND
2014-10-14	825834	ND
2014-10-14	825836	ND
2014-10-14	825835	ND
2014-10-15	825840	ND
2014-10-15	825839	ND
2015-01-20	839968	ND
2015-01-20	839967	ND
2015-02-23	844761	ND
2015-02-23	844760	ND
2015-02-23	844745	ND
2015-02-23	844764	ND
2015-02-23	844741	ND
2015-02-23	844740	ND
2015-02-23	844743	ND
2015-02-23	844744	ND
2015-02-23	844742	ND
2015-02-23	844763	0.770 ppb
2015-03-10	847889	ND
2015-04-21	855404	ND
2015-04-21	855403	ND
2015-04-21	855408	ND
2015-04-21	855407	ND
2015-04-21	855402	ND
2015-04-21	855406	ND
2015-05-05	858198	ND
2015-05-05	858197	ND
2015-07-21	872306	ND
2015-07-21	872301	ND
2015-07-21	872309	ND
2015-07-21	872296	ND
2015-07-21	872308	ND
2015-07-21	872298	ND
2015-07-21	872304	ND
2015-07-21	872310	ND
2015-07-21	872300	0.940 ppb
2015-07-22	872696	ND
2015-07-22	872695	ND
2015-10-19	890002	ND
2015-10-20	890005	ND
2015-10-20	890007	ND
2015-10-20	890003	ND
2016-01-20	902152	ND
2016-01-20	902149	ND
2016-01-20	902157	ND
2016-01-20	902151	ND
2016-01-20	902153	ND
2016-01-20	902154	ND
2016-01-20	902150	0.760 ppb
2016-04-19	916893	ND
2016-04-19	916888	ND
2016-04-19	916894	ND
2016-04-19	916891	ND
2016-07-19	934715	ND
2016-07-19	934709	ND
2016-07-19	934717	ND
2016-07-19	934705	ND
2016-07-19	934714	ND
2016-07-20	935007	ND
2016-08-24	941620	ND
2016-10-18	954229	ND
2016-10-18	954235	ND
2016-10-18	954232	ND
2016-10-18	954233	ND
2017-01-18	970480	ND
2017-01-18	970485	ND
2017-01-18	970482	ND
2017-01-18	970483	ND
2017-01-18	970477	ND
2017-01-18	970484	ND
2017-01-18	970478	0.650 ppb
2017-01-24	970986	ND
2017-01-24	970991	ND
2017-01-24	970992	ND
2017-01-24	970988	ND
2017-01-24	970987	ND
2017-01-24	970990	ND
2017-02-16	974146	ND
2017-04-18	984277	ND
2017-04-18	984278	ND
2017-04-18	984287	ND
2017-04-18	984283	ND
2017-04-19	984286	ND
2017-04-19	984284	ND
2017-04-19	984285	ND
2017-04-19	984290	ND
2017-04-19	984282	ND
2017-04-19	984279	ND
2017-04-19	984276	1.10 ppb
2017-07-17	1004640	ND
2017-07-17	1004639	ND
2017-07-17	1004637	ND
2017-07-17	1004638	ND
2017-07-18	1004646	ND
2017-07-18	1004645	ND
2017-07-18	1004643	ND
2017-07-18	1004641	ND
2017-07-18	1004644	ND
2017-07-18	1004642	0.770 ppb
2017-08-14	1010939	ND
2017-10-16	1024784	ND
2017-10-16	1024785	ND
2017-10-16	1024788	ND
2017-10-16	1024782	ND
2017-10-16	1024787	ND
2017-10-16	1024783	0.730 ppb
2017-10-17	1024701	0.770 ppb
2017-12-19	1034398	ND
2018-01-16	1037644	ND
2018-01-16	1037645	ND
2018-01-16	1037642	ND
2018-01-16	1037643	ND
2018-01-16	1037638	ND
2018-01-16	1037640	ND
2018-01-16	1037647	0.630 ppb
2018-01-17	1037648	ND
2018-01-17	1037650	0.540 ppb
2018-03-13	1044935	ND
2018-04-16	3917834	ND
2018-04-16	3917839	ND
2018-04-16	3917837	ND
2018-04-17	3917838	ND
2018-04-17	3917835	ND
2018-04-17	3917836	0.600 ppb
2018-08-09	4018081	ND
2018-09-11	1079452	ND
2018-09-11	1079446	ND
2018-09-11	1079449	ND
2018-10-16	4091676	ND
2018-10-16	4091677	ND
2018-10-16	4091678	ND
2018-10-16	4091675	0.500 ppb
2018-10-17	4093738	ND
2018-10-17	4093739	ND
2018-10-17	4093740	ND
2019-01-16	1101623	ND
2019-01-16	1101627	0.560 ppb
2019-03-11	1109100	ND
2019-03-11	1109102	ND
2019-03-11	1109101	ND
2019-03-11	1109103	ND
2019-04-16	1115411	ND
2019-04-16	1115494	ND
2019-04-16	1115486	ND
2019-04-16	1115414	ND
2019-04-16	1115492	ND
2019-04-16	1115484	ND
2019-07-15	1134797	ND
2019-07-15	1134799	ND
2019-07-15	1134798	ND
2019-07-15	1134800	ND
2019-07-15	1134801	ND
2019-07-16	1134803	ND
2019-07-16	1134802	ND
2019-07-18	1135762	ND
2019-10-14	1155272	ND
2019-10-14	1155276	ND
2019-10-14	1155275	ND
2019-10-15	1155273	ND
2019-10-15	1155274	0.640 ppb