Chemicals of High Concern

Maine law requires the Department of Environmental Protection to publish a list of no more than 70 chemicals of high concern. Development of Maine’s list of Chemicals of High Concern (CHC) is to be cooperatively determined by the Maine Department of Health and Human Services, Maine Center for Disease Control and Prevention (“Maine CDC”), and the Maine Department of Environmental Protection (“Department”). (38 M.R.S.A. § 1693-A(1)). A chemical currently listed on Maine’s chemicals of concern list may be included on the CHC list if there is a determination of strong, credible scientific evidence that the chemical is a reproductive or developmental toxicant, endocrine disruptor or human carcinogen, AND there is strong, credible scientific evidence that the chemical meets one or more of the following criteria:

  • The chemical has been found through biomonitoring studies to be present in human blood, human breast milk, human urine or other bodily tissues or fluids;
  • The chemical has been found through sampling and analysis to be present in household dust, indoor air or drinking water or elsewhere in the home environment; or
  • The chemical has been added to or is present in a consumer product used or present in the home.

The process used to determine Maine’s CHC list is summarized within supporting documentation provided here.

Maine has designated 49 compounds as Chemicals of High Concern

Chemicals of High Concern (alphabetical by chemical name)
CAS Chemical
27193-28-8 (1,1,3,3-tetramethylbutyl)-phenol
140-66-9 1,1,3,3-Tetramethyl-4-butylphenol
106-93-4 1,2-Dibromoethane
106-99-0 1,3-Butadiene
1163-19-5 2,2',3,3',4,4',5,5',6,6'-Decabromodiphenyl ether; BDE-209
131-55-5  2,2',4,4'-tetrahydroxybenzophenone, BP-2
131-56-6 2,4-Dihydroxybenzophenon
95-53-4 2-Aminotoluene
5466-77-3 2-ethyl-hexyl-4-methoxycinnamate
2425-85-6 2-Naphthalenol, 1-[(4-methyl-2-nitrophenyl)azo]-
91-59-8 2-Naphthylamine
101-14-4 4,4´-Methylenebis(2-Chloroaniline)
92-69-3 4-Hydroxybiphenyl
7440-38-2 Arsenic & Arsenic compounds
71-43-2 Benzene
608-93-5 Benzene, pentachloro-
92-87-5 Benzidine and its salts
85-68-7 Benzyl Butyl phthalate; BBP
7440-41-7 Beryllium & Beryllium compounds
94-26-8 Butyl paraben
25013-16-5 Butylated hydroxyanisole
7440-43-9 Cadmium
117-81-7 Di-(2-ethylhexyl) phthalate, DEHP
84-74-2 Dibutyl phthalate, DBP
84-61-7 Dicyclohexyl phthalate; DCHP
84-66-2 Diethyl phthalate
84-75-3 Di-n-Hexyl Phthalate
106-89-8 Epichlorohydrin
120-47-8 Ethyl paraben
50-00-0 Formaldehyde
25637-99-4 Hexabromocyclododecane
118-74-1 Hexachlorobenzene
87-68-3 Hexachlorobutadiene
7439-97-6 Mercury & mercury compounds
99-76-3 Methyl paraben
1634-04-4 Methyl tert-butyl ether; MTBE
131-70-4 Mono-n-butylphthalate
7440-02-0 Nickel & nickel compounds
556-67-2 Octamethylcyclotetrasiloxane
1763-23-1 perfluorooctanyl sulphonic acid and its salts; PFOS
1806-26-4 Phenol, 4-octyl-
99-96-7 p-Hydroxybenzoic acid
94-13-3 Propyl paraben
14808-60-7 Quartz
100-42-5 Styrene
79-94-7 Tetrabromobisphenol A
108-88-3 Toluene
115-96-8 Tris(2-chloroethyl) phosphate
75-01-4 Vinyl chloride

For additional information contact: Kerri Malinowski or (207) 215-1894